Study Uncovers Aztec Preference for Sierra de Pachuca’s Green Obsidian

Researchers have explored the significance of obsidian, a crucial resource in the Aztec empire, utilized for tools and ritual items, as well as its broad importance in the pre-Columbian period. They examined 788 obsidian artifacts, representing various objects and contexts excavated from the mayor of Tenochtitlan (c. 1375-1520), the empire’s core located in present-day Mexico City. Their findings revealed that the Aztecs favored Green Obsidian from Sierra de Pachuca, while also sourcing this material from seven other locations. These results indicate a complex economy that depended on extensive long-distance trade, influenced not only by conquests but also internal rivalries.

Obsidian artifacts from Tenochtitlan. Image credit: mirsa islas/ptm-inah.

“While the Mexica preferred Green Obsidian, the variety of obsidian types, especially in non-ritual artifacts, indicates that these tools came from multiple markets rather than being directly acquired from sources,” noted a candidate from Tulane University.

“By tracing the origins of this material, we can examine the distribution of goods across Mesoamerica.”

Analysis revealed that nearly 90% of the obsidian artifacts sampled were produced from Sierra de Pachuca Obsidian.

Most ritual items discovered within the buried offerings at Mayor Templo were crafted from this type of obsidian, including small weapons, gemstones, and decorative inlays for sculptures.

A modest yet significant portion of obsidian was sourced from regions like Otonba, Tulanche, Ucaleo, and El Paraiso, with some being beyond the control of the Mexica Empire.

These materials were typically used for tool-making and found in construction fill, suggesting their availability through local markets rather than strict state control.

This study traced the evolution of obsidian use from the city’s early days up to its fall in 1520 AD.

In the initial phases of the Empire, there was greater diversity in obsidian sources present in both ceremonial and daily items.

Following the consolidation of Aztec power around AD 1430, obsidian was primarily sourced from Sierra de Pachuca, indicating a trend towards religious uniformity and centralized oversight.

“This type of compositional analysis enables us to track the evolution of empire expansion, political alliances, and trade networks over time,” remarked Matadamas Gomora.

“This research highlights the vast scope and intricacy of the Mexica Empire and demonstrates how archaeological science can illuminate ancient artifacts and provide insights into past cultural practices.”

Survey results will be published in Proceedings of the National Academy of Sciences.

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Diego Matadama Gomora et al. 2025. A compositional analysis of obsidian artifacts from the mayor of Tenochitlan, the capital of the Mexican Empire. pnas 122 (20): E2500095122; doi: 10.1073/pnas.2500095122

Source: www.sci.news

Genetic Research Uncovers the Origins of Bats

In the early 2000s, bats infected with coronavirus transmitted the virus to raccoon dogs and other wild mammals in southwestern China. Many of these animals were sold in markets where the coronavirus resurfaced. Consequently, the SARS pandemic spread to 33 countries, resulting in 774 fatalities. Months later, researchers identified a mammalian coronavirus known as Palmcoten, found in markets central to the outbreak.

In a study published Wednesday, a team of researchers drew comparisons between the evolutionary paths of SARS and COVID-19, 17 years apart. They examined the genomes of the two coronaviruses responsible for the pandemics, alongside 248 related coronaviruses in bats and other mammals.

Jonathan Pechal, an evolutionary virologist at the University of Edinburgh and author of the study, noted that the histories of the two coronaviruses mirrored each other. “In my opinion, they are very similar,” he stated.

In both instances, Dr. Pekal and his team assert that coronavirus transmission originated from bats in southwestern China to wild mammals. Soon after, wildlife traders transported infected animals hundreds of miles to urban markets, leading to widespread human outbreaks.

“When wildlife is sold in urban centers, pandemics often follow,” stated Michael Warby, an evolutionary biologist at the University of Arizona and co-author of the research.

This research appears at a politically charged moment. Last month, the White House launched a web page titled “Laborek: The True Origins of COVID-19,” asserting the pandemic stemmed from a lab accident in Wuhan, rather than market interactions.

In a budget proposal issued on Friday, the White House indicated that it was “confirming” the lab leak theory, which justified an $18 billion cut to the National Institutes of Health.

The Chinese government responded with a flat denial of claims that COVID was caused by a lab leak in Wuhan, suggesting instead the virus may have originated from a laboratory in the U.S.

“A thorough and detailed investigation into the origin of the virus should be conducted in the United States,” the statement read.

Sergei Pond, a virologist at Temple University, expressed skepticism regarding the resolution of COVID’s origins. He voiced concerns that political rhetoric from both governments could hinder scientific inquiries into the virus’s origins.

“If it weren’t tragic, you’d have to laugh at how things have unfolded,” Dr. Pond commented.

In the initial weeks of the early 2020 pandemic, the virus responsible, SARS-CoV-2, emerged alongside notions of biological weapons created by the Chinese military. A cohort of scientists analyzing available data at that time dismissed this claim, indicating that while they could not dismiss accidental lab leaks, they leaned towards the natural origins of COVID.

Over the ensuing months, Dr. Warby, who was not part of that group, grew dissatisfied with the lack of compelling evidence favoring one theory over another. He co-signed an open letter with 17 other scientists advocating for further investigation to ascertain the most likely explanation.

“We felt there was much yet to be learned, so let’s not dismiss the lab leak theory,” Dr. Warby asserted. “Let’s investigate.”

As Dr. Warby and other researchers scrutinized COVID’s origins, the American intelligence agencies conducted their assessments. Their conclusions were varied. The FBI and CIA support the lab escape theory from the Wuhan Institute, albeit with little certainty. The Department of Energy expresses low confidence in the possibility of a virus escape from another lab in Wuhan, while other institutions favor a natural origin.

Scientists have struggled to evaluate the evidence behind these conclusions as the relevant institutions have not published supporting data or analyses. However, Dr. Warby and his colleagues have released several papers in scientific journals. Along this journey, Dr. Warby became convinced that the COVID pandemic originated at the Huanan Seafood Market in Wuhan.

“Scientifically, that’s evident,” Dr. Warby remarked, referencing both HIV and the Spanish flu, two diseases with origins that have been thoroughly studied.

In their recent study, Dr. Warby, Dr. Pekal, and their colleagues examined 250 genomes of coronaviruses, leveraging genetic similarities and differences to establish relationships. They successfully reconstructed the evolutionary timeline of the coronaviruses responsible for both SARS and COVID-19, known as SARS-CoV and SARS-CoV-2.

The ancestors of both coronaviruses have been circulating in bats across China and its neighboring regions for hundreds of thousands of years, specifically inhabiting southwestern China and northern Laos for the last 50 years.

When coronaviruses infect bats, they sometimes cohabitate with another coronavirus. This can lead to the accidental creation of a hybrid virus carrying genetic material from both original coronaviruses, a process referred to as recombination.

“These are not ancient events,” noted David Rasmussen, a virologist at North Carolina State University involved in the new research. “These occurrences happen frequently; these viruses are truly mosaic in nature.”

In 2001, shortly before the SARS pandemic emerged, researchers found that SARS-CoV had undergone significant genetic mixing among bats. This led to the virus’s potential evolution into a human pathogen. However, given that Guangzhou is hundreds of miles from the ancestral area of SARS-CoV, it’s improbable that the virus gradually reached the city through bats.

Researchers generally concur that ancestors of SARS-CoV infected wild mammals, which were subsequently sold in markets around Guangzhou. Shortly after the onset of the SARS pandemic, the presence of SARS-CoV was confirmed in palm civets and other wild mammals traded in the market.

A similar trend was observed with SARS-CoV-2, the virus responsible for COVID-19. The final recombination event in bats occurred between 2012 and 2014, just five to seven years prior to the COVID outbreak, hundreds of miles away from northeastern Wuhan.

Moreover, this signifies a considerable distance from the area where the virus’s ancestors circulated, paralleling the journey that SARS-CoV undertook via the wildlife trade.

Proponents of the lab leak theory emphasize the significant distance between Wuhan and the habitats of the closest relatives of SARS-CoV-2. They argue that if bats traveled to the area around Wuhan without infecting local mammals, scientists must have been collecting coronaviruses from bats in southwestern China and experimenting on them in the lab.

American scientists have critiqued the Wuhan Institute of Virology for lax safety measures in their coronavirus experiments. Nevertheless, no evidence has confirmed that the ancestors of SARS-CoV-2 were present at the institute prior to the pandemic. Recent research by Dr. Warby and his colleagues illustrates that bat coronaviruses can traverse considerable distances via wildlife trade without any scientific intervention.

The researchers argue that these findings align with a study published in 2022, identifying the Huanan Wet Market in Wuhan as the site of the initial COVID outbreak. Wild mammals were sold at this venue, and early cases of COVID were documented there. Moreover, Chinese researchers collected various strains of SARS-CoV-2, exhibiting different mutations at this location. Dr. Warby and his team posited that the virus likely spilled over from wild mammals at the market on two separate occasions.

Dr. Pond stated that while the new study supports the wildlife spillover theory, he does not believe the issue has been definitively settled. He highlighted two statisticians’ critiques from last year, regarding the modeling behind the 2022 study. Dr. Warby and his colleagues have provided a rebuttal to those criticisms. “That debate is still ongoing,” Dr. Pond remarked.

Mark Eloit, former director of the Pasteur Institute in Paris, emphasized the importance of the new research in clarifying the origins of SARS-CoV-2.

However, he also noted that the coronavirus exhibits significant differences from closely related bat viruses. Following its divergence from those viruses, it would have undergone mutations or recombination to effectively spread among humans.

“I contend that the potential for recombination events—either incidental or deliberate—remains as plausible as the hypothesis of zoonotic transfer via intermediate hosts at the market,” Dr. Eloit argued.

Dr. Eloit and other scientists concurred that discovering intermediate hosts of SARS-CoV-2 among wild mammals would significantly bolster the argument for natural spillover. However, Chinese officials examined various animals at the onset of the pandemic but found no traces of the virus.

Before scientists could conduct studies, wildlife vendors at the Huanan Market removed animals from the stalls, and when China ceased wildlife trade, farmers culled their animals.

“There are large gaps in our knowledge, and we can’t overlook that,” Dr. Pond remarked.

Stephen Goldstein, a geneticist at the University of Utah, remarked that while he was not involved in the new study, the findings serve as a cautionary reminder of future pandemic risks. Wild mammals traded in markets within regions where SARS and COVID-19 emerged can wreak havoc in urban centers hundreds of miles away. “These viral fragments are present in numerous places,” Dr. Goldstein concluded.

Source: www.nytimes.com

The Curiosity Rover Uncovers Carbonate Minerals on Early Mars, Revealing the Carbon Cycle in Action

NASA’s curiosity rover discovered evidence of the ancient Mars carbon cycle, bringing scientists closer to answers on whether the planet can support life.

Curiosity watches the track retreat in the distance on April 30, 2023 at a site called Ubajara. This site is where Rover discovered the Siderate. Image credit: NASA/JPL-Caltech/MSSS.

Planetary researchers have long believed that Mars once had a thick carbon dioxide-rich atmosphere and liquid water on the surface of the planet.

That carbon dioxide and water should have reacted with Mars rocks to produce carbonate minerals.

However, to date, rover missions and near-infrared spectroscopy analysis from Mars orbit satellites have not discovered the amount of carbonate on the Earth’s surface predicted by this theory.

“We’ve seen a lot of experience in the world,” said Dr. Benjamin Tutoro, a researcher at the University of Calgary.

“The planet is habitable and shows that the model of habitability is correct.”

Using data collected by curiosity, Dr. Tutoro and his colleagues analyzed the composition of the 89 m stratigraphic section of Gail Crater, which once contained an ancient lake.

They identified high concentrations of iron carbonate minerals called siderelites in layers rich in magnesium sulfate, ranging from about 5% to over 10% by weight.

This was unexpected as orbital measurements had not detected carbonates in these layers.

Given its source and chemistry, the researchers speculate that the Seidelians, formed by the water rock reaction and evaporation, indicate that carbon dioxide has been chemically isolated from the Martian atmosphere to sedimentary rocks.

If the mineral composition of these sulfate layers represents a globally sulfate-rich region, these deposits contain large carbon reservoirs that were previously unrecognised.

The carbonate is partially destroyed by a later process, indicating that some of the carbon dioxide was later returned to the atmosphere, creating a carbon cycle.

“The discovery of abundant siderelites in Gale Crater represents both an astonishing and important breakthrough in understanding Mars’ geological and atmospheric evolution,” Dr. Tutoro said.

Dr. Thomas Bristow, a researcher at NASA’s Ames Research Center, added:

“A mere centimeters below gives us a good idea of ​​minerals that were formed on or near the surface about 3.5 billion years ago.”

Survey results It will be displayed in the journal Science.

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Benjamin M. Tsutoro et al. 2025. Carbonates identified by the curiosity rover show the carbon cycle operating on ancient Mars. Science 388 (6744): 292-297; doi: 10.1126/science.ado9966

Source: www.sci.news

New research uncovers Asian Hornets preying on nearly 1,500 invertebrate species

Biologist of University of Exeter We conducted the first large-scale study on Asian Hornet diets (Vespa Velutina), exploiting deep sequences to characterize the intestinal content of larvae in Jersey, France, Spain and the UK. European honeybees were the most common species found in the Hornets, but their diet is much broader. The analysis detected 1,449 invertebrate species, increasing the prey abundance of samples from south latitude.

Asian Hornet (Vespa Velutina). Image credit: Gilles San Martin/CC BY-SA 2.0.

The invasive species of Asian hornets are now found in much of Western Europe.

The nests are destroyed every year in mainland Britain as authorities try to lock out the seeds.

“The University of Exeter has been working hard to understand,” said Dr. Sifreya Pedersen, a researcher at the University of Exeter.

“Diets vary strongly across seasons and regions, indicating that they are highly flexible predators.”

“Most insect populations are reduced due to factors such as habitat destruction and chemical contamination.”

“The expanded areas where the Hornets live in Asia pose an extra threat.”

In this study, Dr. Pedersen and colleagues used a method called deep sequencing to identify the visceral prey species of over 1,500 Asian hornet larvae eating foods offered by adult hornets.

Of the top 50 invertebrate prey species identified, 43 are known to visit flowers. Among these were pollinators of three major European crops.

“Insects play an important role in enabling ecosystems to function, including pollination, decomposition and pest control,” Dr. Pedersen said.

“Our research provides important additional evidence of the threat posed as the Asian Hornets spread across Europe,” said Dr. Peter Kennedy of the University of Exeter.

The researchers identified 1,449 operational taxonomic units in the internal organs of hornet larvae.

More than half could be identified as a specific species, but the rest could not. Therefore, the exact number of species contained in the sample is not certain.

“We have provided the most comprehensive view of the European Asian Hornet diet to date, highlighting the highly broad and flexible potential prey,” the scientist said.

“The dietary composition shows that it differs across geographical regions and throughout the Hornets' active season, indicating high adaptability to new ecosystems. It drives both the invasive success of Asian hornets and the risks they pose to a wide range of native invertebrate fauna.”

“The growing prevalence of dietary bees in Europe has agreed to previous research and reports from beekeepers, supporting concerns about the risks of aquaculture.”

“Our results found that Asian hornets exhibit high predation frequencies on wild pollinators and recyclers, revealing further potential ecosystem-level pressures, implying a threat to the diversity of pollinators and recyclers and the resulting ecosystem services.”

study Published in the journal The science of the total environment.

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Siffreya Pedersen et al. The broad ecological threat of invasive hornets has been revealed through a deep sequencing approach. The science of the total environmentPublished online on March 4th, 2025. doi:10.1016/j.scitotenv.2025.178978

Source: www.sci.news

New Evidence Uncovers Startling Truths: When Did Life Begin on Earth?

The Earth is about 4.5 billion years ago. When it was formed from rocks colliding around the dim young sun, it was probably not lively, and for a long time geologists thought life would not appear for more than a decade. The idea came from the analysis of Moonlock, brought back from Apollo Landings. This indicated that the Earth was hampered by space rocks from 4 billion to 3.8 billion years ago. The meaning was that, as we know, it must have started after that, since the previous creatures were getting faster.

“There are two problems with that.” Philip Donohue At the University of Bristol, UK. First, the model suggests that some life could have survived deep within the ocean. Even worse, it appears that the heavy late artillery fires did not actually occur now. The Apollo mission produced the impression of a large artillery over a short period of time, as all gathered rocks of similar age.

Early in the history of the Earth, we found that major effects had sporadically occurred over hundreds of millions of years. However, it is also known that a Mars-sized body collides shortly after the formation of Earth, evaporating the planet's surface. “If life had been born earlier, it would have been wiped out,” Donohue said.

The oldest rock on the earth

Life began when inerts were self-organised into a living system, but despite decades of research, how it happened remains a mystery. As the fossil record gets worse, it's also a big challenge to understand that it happened when it happened…

Source: www.newscientist.com

New study uncovers the potential for Earth-like life to exist near a white dwarf star

According to a new study from the University of California, Irvine University, white dwarfs are the life of planets that have produced a warmer surface environment than a warmer surface environment formed within a habitable zone or within a habitable zone. It may provide a suitable environment.

The drainage ability to orbit the habitable zone of the white dwarf may have more Clement states to compensate for the cooling and dimming of the host star over time. Image credit: David A. Aguilar/CFA.

This study included the University of California Irvine Astronomer. Aokawa Shield Coworkers compared the climate of the water world with an Earth-like atmosphere composition orbiting in habitable zones of two different types of stars: the white d star and the main sequence K-Dwarf star Kepler-62.

Using a 3D global climate computer model, normally used to study the Earth's environment, they say that despite similar stellar energy distributions, the explanet of the white d star is far more than the Kepler-62 deplanet I discovered it was warm.

“White dwarf stars may emit some heat from residual nuclear activity into the outer layer, but they no longer exhibit fusion at their core,” Dr. Shields said.

“For this reason, we don't take into account much of the ability of these stars to host habitable exoplanets.”

“Our computer simulations suggest that if rocky planets exist in orbit, these planets may have more habitable real estate on their surface than previously thought. ”

The White Dwarf habitable zone is much closer to the stars compared to other star settlements, such as Kepler-62.

The authors emphasized that this would result in a much faster rotation period (10 hours) for the white dwarf exoplanet, and that Kepler 62's exoplanet has a 155-day rotation period.

Both planets can be trapped in synchronous orbits with permanent daysides and permanent nightsides, but the rotation of the super-fast white dwarf planets extends the circulation of clouds around the planet.

The much slower 155-day orbital period of the Kepler-62 planet contributes to large dayside liquid cloud masses.

“Synchronous rotation of exoplanets in habitable zones of normal stars like Kepler 62 creates more cloud covers on Earth's dayside, reflecting incoming radiation away from the Earth's surface. I expect that,'' Dr. Shields said.

“That's usually good for planets orbiting near the inner edge of the star's habitable zone, where you can cool off a bit, rather than losing the ocean in a runaway greenhouse.”

“But for a planet orbiting straight in the middle of a habitable zone, that's not a very good idea.”

“The planet orbiting Kepler-62 has so many clouds that it is covered in clouds, sacrificeing valuable habitable surface area in the process.”

“On the other hand, planets orbiting the white dwarf spin so fast that they hardly have cloudy time during the day, so they retain more heat and work in their advantage.”

Less liquid clouds and the strong greenhouse effect on the Nightside creates a warmer state on the white dwar planet compared to the Kepler-62 planet.

“These results suggest that the once thought to be lifeless, white d star stellar environment could present a new pathway for exoplanet and astrobiology researchers to pursue. I'm doing that,” Dr. Shields said.

“With powerful observational capabilities online to assess exoplanet atmospheres and astrobiology, such as those related to the NASA/ESA/CSA James Webb Space Telescope, we are now studying a whole new class of whole new classes. You can enter a new stage of being. The world around the stars that was previously not announced.”

study It was published in Astrophysical Journal.

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Aokawa L. Seals et al. 2025. Increased surface temperature of the habitable white dwarf world compared to the main sequence exoplanet. APJ 979, 45; doi: 10.3847/1538-4357/AD9827

Source: www.sci.news

Non-biologist uncovers evidence of a massive Hadrosaurus dinosaur in the Gobi Desert

Anti-Japanese and Mongolian paleontologists have found the footprints of Hadrosaurus dinosaur fossils eating large plants from the Cretaceous.

A huge Hadrosaurus dinosaur footprint in the Gobi Western Desert in Mongolia. Image credit: Okayama Science University.

The newly discovered Hadrosaurus footprint dates back about 70 million years ago (Cretaceous).

One of them is about 92 cm in diameter (3 feet), one of the largest Hadrosaurus footprints found so far.

“It is thought that the biggest footprint belongs to the giant SaurolovsIt is estimated that the overall length of the whole body exceeds 15 m (50 feet), and evenly Tyrannosaurus and Turbo saurus Team leader of size Shinobu IshigakiOkayama Science University Dinosaur Museum Research Bureau, and his colleagues stated in a statement.

Saurolovs Is a large Hadrosaurus dinosaur known by the Canadian horseshoe canyon and the Mongolian Nemegut layer.

According to an old-fashioned scholar, it is one of the few dinosaur genus from multiple continents.

“Our discovery suggests that one of the largest bipedal behaviors known so far lived in Mongolia, and also enhances hope for the discovery of large-scale skeletal archeological sites. They say. “

In addition, researchers have found a 24 m (79-foot) trackway composed of about 85 cm (2.8 feet) fossils (2.8 feet).

“From June 1 to 15, 2024, we conducted a follow-up survey in the Nishi Gobi Desert,” he said.

“As a result, we discovered a new trackway, including three footprints of the largest Hadrosaurus discovered so far and 13 fossiled footprint sequences.”

“The identification of 14 trackways, including those found before 2018, enables analysis of posture, walking style, speed, and group movements. This is an unpredictable details.”

“So far, the largest known Hadrosaurus skeleton belongs. Shunton SaurusThey were found in Shandong Province, China. “

“However, the latest discovery in Mongolia suggests the possibility of clarifying large-scale skeletal archeological sites in this area.”

“Our next goal is to clarify a large full skeleton. Saurolovs I will be in charge of these footprints, “said Dr. Ishikawa.

Source: www.sci.news

Ancient 1,900-Year-Old Papirus Uncovers Criminal Case in the Roman Empire.

This Papirus, written in Greek, visited the area in 129/130 AD, and in front of Jewish or Roman officials in Arabia in the reign of the Roman Emperor Hadrian, before the revolution of 129/130 AD. This is a memorandum of hearing. The rebellion of Bar Coffba in 132. Papyrus includes the unofficial record of the hearing. This is related to many individual prosecutions, including specific Gadarias and Sauros. Avoid the empire Finances (Ministry of Finance dominated by the emperor).

1, 900 years ago Papil Scotton. Image credit: Shai Halevi.

Papyrus in question was found in the 1950s in one of the Nahal Haber caves in the Jewish desert.

Initially, this document, which had been misaligned as a Nabatea, remained unnoticed until Hanna Cotton Pargi of Hebrew University was rediscovered in 2014.

Currently, Papirus, which is called Papir Scotton, is the longest Greek document in the Jewish desert because it exceeds the 133 lines.

Professor Cotton Parciel, Austrian Science Academy, Vienna University, and Hebrew's colleagues say that this document says the prosecutor in front of the Roman officials (132-136 CE) of the Roman officials (132-136 CE) the night before the bar. I judged that it was represented. A transcript that was rapidly drafted by the judicial hearing itself.

The language is full of lively and direct, and one prosecutor has advised another prosecutor on the strength of various evidence and predicts the objection.

“This papyrus is extraordinary to provide direct insights in preparing for trials in the Roman Empire,” said Dr. Anna Dorgano, Austrian Science Academy.

“This is the best documented Roman court lawsuit from Jews apart from Jesus' trial,” said Dr. Avenner Ecker at Hebrew University.

Papyrus detailed the incidents, which are almost compatible with modern Israel and Jordan, including forgery, tax evasion, fraudulent sales and slave abuse in Juda and Arabia.

The main defendants, Gadarius and Sauros, are accused of corrupt transactions.

Gadaria, the son of a notary public and probably Roman citizen, had a crime, including violence, terrifying tor, counterfeiting, and rebellion.

His collaborator, Sauros, adjusted the fictitious sales and slaves principles without paying the necessary Rome taxes.

In order to hide their activities, the defendant counterfeited documents.

“Falculation and tax fraud have suffered severe penalties under the Roman law, such as intense labor and death penalty,” said Dolgonov.

The criminal case was deployed between the two major Jews uprising to Rome's rule: Jewish Diaspola rebellion (115-117 CE) and Barcova rebellion (132-136 CE).

In particular, this text involved Gadarias and Sauros in rebellious activities during the visit by Emperor Hadrian (129/130 AD), and when Bar Coffba Revolt began, Tanius, the governor of Juda, Tanius.・ It is named Rufus.

With his previous anxiety, the Roman authorities probably have seen the defendant with doubt and linked their crimes to a wider conspiracy against the empire.

“Whether they were actually involved in the rebellion remain unresolved, but the flirting is talking to the charged atmosphere at the time,” said Dolgano.

“The nature of the crime makes a question because it doesn't seem to be a profitable business model,” said Dr. Ecker.

“The origin of the slaves is unknown, but this case may include the Bible's duty of the Jews of illegal trafficking or reimbursing the slaves. “

Papyrus provides new insights on the Roman method of the East Empire speaking in the Greek, referring to the governor of the Jewish Assazazi Tour and the Forced JU Service.

“This document indicates that the Core Roma institution, a documented in Egypt, is being implemented throughout the empire,” Mitthof said.

“Papyrus also introduces the ability to regulate private transactions in Roman in remote areas.”

“In the Kokhba Revolt, the caution was a mystery, which is likely to have been born from a hideaway cave in the Jewish desert, and the results of the trial may have been interrupted by rebellion.”

Team paper Published in the journal Thai

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Anna Dolgano et al。 2025. Falculation and fiscal fraud in the night before the bar: A memorandum of Roman officials (P.Cotton) and the minutes of trial. Thai 38; DOI: 10.25365/tyche-2023-38-5

Source: www.sci.news

Ancient DNA analysis uncovers Ukraine’s intricate genetic history

To study the history of migration and movement in the Ukrainian region, with a particular focus on Iron Age and Medieval migrant populations, the scientists generated genomic data on 91 individuals from around 7000 BC to around 1800 AD. Their results show that ancient peoples had diverse ancestry as a result of frequent migration, assimilation, and contact.



A map showing the geographical location of the ancient figures included in the study and a chronology showing the dates of the figures in the archaeological group. Image credit: Saag others., doi: 10.1126/sciadv.adr0695.

Over the centuries, migration has taken place in the steppe and forest-steppe regions of Ukraine in several directions.

These migrations were driven by a variety of processes, including cultural contacts and conflicts between tribes, trade, demographic pressures, and the expansion of nomadic areas of influence.

The main migration flows were from the Carpathian-Donabian region, the Southern Ural-Volga region, Central Asia and the North Caucasus, and intensive population movements also occurred within the territory of Ukraine.

At the end of the Bronze Age and the beginning of the Early Iron Age, the most notable archaeological activity in the northern Pontic Steppe was Cimmerian and military operations in Asia Minor.

The Cimmerians were followed by Scythians and SarmatiansEarly Iron Age political and military tribal confederations with various combinations of local and East Asian ancestry, as shown by previous ancient DNA (aDNA) studies. At this time, the northern Black Sea coast was covered with a network of urbanized Greek colonies.

In the forest-steppe region, the modern sedentary population is influenced by the former Tsinets culture (including the Lusatian and Vysotska cultures) and the central European influences of the Hallstatt and La Tène periods (Illyrians, Thracians, Celts). It was related.

According to written and archaeological sources, the peoples considered to be the predecessors of the Slavs were Zarbinetska culture — Already existed in the Ukrainian region from the 3rd century BC onwards, during the La Tène and Roman times.

The beginning of the era of migration in the Ukrainian region is associated with the arrival of Germanic tribes such as the Goths and the formation of a multiethnic state. Culture of Cherniahivwhich also included other ethnic groups that already lived in the area.

Between the 2nd and 4th centuries AD, the nomadic Huns of Central Asia emerged on the northern Pontic Steppe, and their westward migration brought about significant economic, cultural, and social changes in Europe.

This period is associated with the emergence of a new ethnolinguistic group, the Slavs, who spread across much of Eastern Europe between the 5th and 7th centuries AD.

From the 8th to the 10th century AD, large parts of Ukraine were under its control. Khazar Khaganate.

In Ukrainian archeology, this is expressed as follows: saltive cultureit is believed that it was shared among multiple ethnic groups (Alans, Bulgars, Turks, Slavs, Magyars, etc.).

At the same time, there was a process of unification of the Slavic tribes, and in the 9th century AD, Kiev Rus was formed.

The development of Slavic states took place against the background of constant nomadic invasions from the east.

Between the 11th and 13th centuries AD, waves of Pechenegs, Turks, and Cumans invaded the northern Pontic region from Central Asia. The most substantial invasion in terms of military power and results was that of the Mongols of the Golden Horde. 13th century AD.

By the 15th century AD, remnants of the Golden Horde, such as the Nogai, still lived in the steppes of northern Pontus.

Since the 16th century. In the Western era, Slavs were the majority ethnolinguistic group in the Ukrainian region.

“We decided to investigate the genetic ancestry of people who lived in the northern Pontic region during these times and were associated with different cultural groups,” said lead author of the study and co-author of the University of Tartu and University of Tartu. said Dr. Letty Saag, a researcher at College London. And my colleagues.

For the study, the authors extracted and sequenced DNA from tooth roots and bone fragments from 91 people at 33 archaeological sites in present-day Ukraine.

The sample included one Neolithic individual (7000–6000 BC), nine individuals from the Bronze Age and the beginning of the Final Bronze Age to the beginning of the Iron Age (3000–700 BC), and six individuals from the beginning of the Early Iron Age. contained the name (900-700 BC), 29 people of the Early Iron Age Scythian period (700-300 BC), 6 people of the Early Iron Age (700-300 BC), the end of the Iron Age (400-1 BC). , 12 from the Late Iron Age (1-400 AD), 9 from the Early Middle Ages (800-900 AD), and from the Middle Ages to B.C. 19 Early modern period (900 to 1800 AD).

Their DNA analysis shows that ancient peoples had diverse ancestry as a result of frequent migration, assimilation, and contact.

“From the Mesolithic to the time of the Vysotska and Vylozerska cultures at the end of the Bronze Age, the proportion of large-scale ancestry was similar to modern populations in other parts of Europe, first as hunter-gatherers and then as early farmers. and finally a mixture of the two: early farmers and steppe pastoralists,” the researchers said.

“From the Cimmerian period to the Middle Ages, the appearance of eastern nomads in the Pontic region became a common occurrence.”

“Their genetic make-up ranges from Yamuna-like superimposition on indigenous peoples, such as the Scythians and Cumans, to highly East Asian ancestry and minimal indigenous ancestry, such as the Alan Bulgars and Nogais. They ranged from mixed race to mixed race.”

“At that time, nomadic groups were recorded in the steppe regions, but the people of other parts of the Ukrainian region had mainly European ancestry, with connections to local ancestors and Thracians, Greeks, Goths, etc. there were.”

“The palincest of migration and population mixing in the Ukrainian region contributes to high genetic heterogeneity in geographically, culturally and socially homogeneous populations, and between individuals from the same place, at the same time, and with the same characteristics. “Different genetic profiles will exist,” they added.

“Our study focuses specifically on historically attested migrant populations rather than local populations, and the sampling is geographically biased primarily towards eastern Ukraine and temporally towards the Iron Age and Middle Ages. It is important to note that

“Nevertheless, a large local genetic profile similar to modern Ukrainians persists in the region through time and within this sample set.”

“This ancestral structure can be traced back at least to the Zurbunas, and is also found in the Vysotskas and Lusatians, the Scythians of the west, the modern agricultural peoples of the east, the Chernyahivs, and even the medieval and early modern Slavs.”

“We infer that there has been a major indigenous component in the ancestry of Ukrainians since at least the Bronze Age, although there are clear traces of high migration activity, including immigration from East Asia and extensive admixture. ”

of findings Featured in this week's diary scientific progress.

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Letty Thurg others. 2025. Crossroads of the Northern Pontus: Migration of Ukraine from the Bronze Age to the Early Modern Period. scientific progress 11(2);doi: 10.1126/sciadv.adr0695

Source: www.sci.news

Robot Pigeon Uncovers the Secrets of Bird Flight without Vertical Caudal Fins

A pigeon-inspired robot has uncovered the mystery of bird flight without vertical tails found in human-designed aircraft. The prototype has the potential to lead to passenger planes that can reduce drag and fuel consumption.

The vertical stabilizer, or tail fin, in aircraft allows for side-to-side turns and prevents unintentional changes in direction. Some military aircraft, like the Northrop B-2 Spirit, are designed without tails to reduce radar visibility. Instead, they use inefficient methods like flaps creating extra resistance on one side.

Research by David Lentink at the University of Groningen in the Netherlands led to the development of the PigeonBot II to study how birds maintain control without vertical stabilizers.

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PigeonBot II, a robot designed to imitate bird flight techniques

Eric Chan

The previous model, built in 2020, mimicked bird flight by flapping wings but had a traditional tail. The new design, featuring 52 real pigeon feathers, incorporates a bird-like tail, and successful test flights confirm its functionality.

Lentink explains that PigeonBot II’s success lies in its programmed, reflexive tail movements resembling those of birds. The intricate tail movements contribute to stability, proven by the robotic replica’s flight.

The team controlled PigeonBot II’s nine servo motors, utilizing propellers on each wing for steering and tail adjustments in response to the autopilot’s commands. Lentink notes that the complexity of these reflex movements prevents direct human control of PigeonBot II.

After numerous unsuccessful tests, the control system was refined, enabling safe takeoff, cruising, and landing. Lentink envisions a future where vertical stabilizers are unnecessary, reducing weight and drag in aircraft designs.

Source: www.newscientist.com

UK uncovers ancient cockroach fossil from 180 million years ago

Paleontologists have described a new genus and species of Jurassic cockroach. alderblattina simsibased on an isolated wing discovered in Gloucestershire, England.

alderblattina simsi:(A) Dried specimen. (B) Specimen moistened with ethanol. Note the two subspherical spots (spots) on the wing tips and the prominent distal coloration. Scale bar – 1 mm. Image credit: Swaby others., doi: 10.1002/spp2.1598.

Open University palaeontologist Emily Swaby and colleagues from the Open University and National Museums of Scotland said: “Insects are the most diverse group of terrestrial organisms in the history of life, and have been fundamental to terrestrial ecosystems since the early Devonian period. It has become a major component.”

“Primarily detritivores (decomposers), cockroaches play an important role in nutrient cycling in ecosystems through the decomposition of organic matter and are an important food source for many predators, including birds, lizards, and other mammals. ”

“cockroach(Brat Dare) They are part of the superorder Diptera, beginning in the Bashkirian period (Carboniferous) and diversifying rapidly during the second half of the Moscow period and the penultimate Kasimov period of the Carboniferous period. ”

“Further diversification occurred during the Early and Middle Permian.”

“After the mass extinction at the end of the Permian period, cockroach numbers declined sharply, but they flourished again during the Triassic period.”

The newly described cockroach species lived during the Toarcian period of the Early Jurassic period, about 180 million years ago.

named alderblattina simsihad a relatively small size and distinct wing coloration.

“Color patterns in insects, including their wings, are interpreted to be primarily physiological adaptations, thought to be used to protect against predation and sexual signaling,” the paleontologists say. said.

“Today, cockroach species display a wide variety of color patterns, and their functions include communication, protection from predation, sexual signaling, and hardening of the epidermis.”

alderblattina simsi It is the second cockroach species to have a distinct Toarcian wing coloration pattern. ”

assigned author alderblattina simsi It belongs to the cockroach family Rhipidoblattinidae.

Alderblattina Shimshi “The presence of two distinct spherical spots on the forewings and the coloration of the wing tips are very different from all other Jurassic cockroaches,” the researchers said.

of Alderblattina Shimshi The fossil was collected by geologists in January 1984 Mike J. Sims.

The specimen was taken from Alderton Hill. whitby mudstone formation.

“We hypothesize that extreme environmental conditions are associated with this problem. Toarcian ocean anoxic phenomenon “Competition for resources and evolutionary changes in predators were promoted, resulting in the development of apothematic coloration in two insect orders at this time,” the researchers said.

Alderblattina Shimshi This is the seventh valid member of the European Toalchian cockroach family and adds to our knowledge of the European Toalkian cockroach fauna. ”

“This unique specimen adds significance to the record of Mesozoic cockroach wing color patterns and provides important evidence to further understand the evolution of terminal color patterns in the suborder Cockroaches. ”

a paper The survey results were published in a magazine paleontology papers.

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Emily J. Swaby others. 2024. A new species of cockroach (Rhipidoblattinidae) that lived in the Toarcian (Late Jurassic period) of Alderton Hill, Gloucestershire, England. It is likely that aposematic coloration was the earliest to occur in cockroaches. paleontology papers 10 (5): e1598;doi: 10.1002/spp2.1598

Source: www.sci.news

Science uncovers the factors behind Hurricane Milton’s intense strength

overview

  • Hurricane Milton strengthened at the fastest rate on record.
  • The storm's wind speeds exceeded 175 miles per hour, unprecedented for an October hurricane.
  • Record-breaking hydrothermal waters in the Gulf of Mexico helped intensify Milton, increasing its size through a process known as eyewall displacement.

Hurricane Milton has been a surprise at almost every turn.

What began as a small, well-scarred hurricane has grown into a vast monster that has grown in strength at the fastest rate in recorded history. The storm could cause dangerous flooding across parts of Florida's west and east coasts, particularly putting the flood-prone areas of Tampa Bay, home to more than 3 million people, at risk.

As the storm developed, record warmth in the Gulf of Mexico helped the storm intensify. He then underwent an eyewall replacement process to increase in size.

Explain how Milton developed into such a serious threat.

Pacific influence

Hurricanes approaching the United States typically follow similar paths. Tropical cyclones form off the west coast of Africa, gain strength as they cross the Atlantic Ocean and enter the warm waters of the Caribbean Sea.

But part of Milton's origin story lies in the eastern Pacific. This hurricane formed when the remnants of a tropical cyclone in the Pacific Ocean pushed eastward across the Yucatan Peninsula and encountered a stationary front in the Gulf of Mexico. The most recent storm to hit Florida after forming in the same area, Mexico's Bay of Campeche, occurred in 1867.

Follow live updates about Hurricane Milton

Chris Slocum, a physical scientist at the National Oceanic and Atmospheric Administration's Satellite Applications Center, said that when the tropical storm entered the Gulf Coast, it created “a little bit of a vortex, some rotation” in the thunderstorm system there.

Milton was then organized and kept away from other star systems.

“By being isolated from other thunderstorms, the pressure increases and the winds increase,” Slocum said. Milton began to draw air toward its center, drawing energy from the warm ocean.

small but strong

Milton started out as a very small storm, which conserved its angular momentum and rotated tightly and rapidly around a narrow eye.

The Gulf Coast experienced record high ocean temperatures and moist, warm air. These are the necessary elements to strengthen your power. On Monday, the central pressure in Milton's core decreased at a constant rate. A scientist was described as “crazy” As Milton grows stronger. The value of central pressure is closely related to storm strength and wind speed.

“This is absolutely terrifying,” NBC South Florida hurricane expert John Morales said, choking on the air as he talked about the importance of the pressure drop.

Milton's wind speed is 92 mph in about 24 hoursAccording to the nonprofit research organization Climate Central. This far exceeded a milestone that scientists consider rapid intensity: an increase of 35 mph in 24 hours.

“It's unusual that it went from a tropical storm to a Category 5 hurricane in less than two days,” said Kartik Balaguru, a climate scientist at the Pacific Northwest National Laboratory.

Jonathan Lin, an atmospheric scientist at Cornell University who specializes in hurricane forecasting and modeling, called Milton “one of the fastest-strengthening hurricanes we've ever seen in the Atlantic.” There is.

The hurricane's wind speeds exceeded 175 miles per hour, unprecedented for an October storm. Milton is the strongest Gulf hurricane since Hurricane Rita in 2005.

new eyewall

In the Northern Hemisphere, hurricanes wrap counterclockwise around a central, mostly cloudless eye.

Bands of rain began falling outside of Milton Monday night into Tuesday. These storms merged to form a second ring, creating a replacement eyewall and tripling the radius where maximum wind speeds were recorded, Slocum said.

This phenomenon, known as eyewall displacement, typically causes storms to widen but reduce wind speeds somewhat, and it happened to Milton. As the storm develops, it may occur several times. Once this process is complete, and conditions permit, the hurricane may begin to gain strength again.

“You can think of it as molting. Once it molts, it can intensify again. That's exactly what we saw in Milton,” Lin said.

wobble

According to the National Hurricane Center, Milton “wobbled” Tuesday afternoon, changing its expected path and moving its expected landfall south.

Wobble results from instability due to complex mechanics inside the eyeball.

Lin explained the dynamics of a hurricane by comparing it to a top or a dreidel.

“Sometimes you'll see the top spinning. If you push it a little bit or give it a little push, it wobbles a little bit and then it starts spinning again,” Lin said. “It redirects itself.”

Large shakes can change the course of the storm and determine which locations receive the brunt of the hurricane.

Forecasters are expecting storm surge of up to 13 feet. If the storm were to change course slightly to the south, it could avoid the worst of the flooding in especially vulnerable Tampa Bay. In 2017, Hurricane Irma changed course to the east, helping Tampa Bay avoid a predicted storm surge of more than 12 feet.

Once the storm reaches the coast, areas south of Milton's Eye should experience strong wind gusts, pushing water onto shore and resulting in storm surge.

That's because of the angle at which the storm approaches the Florida peninsula and the counterclockwise rotation of the winds around its center.

what happens next

Milton weakened during her final approach to the Florida Peninsula. The main reason for this is that they encountered vertical wind shear, which refers to changes in wind speed and direction in the upper layers of the atmosphere.

But Lin said, “That doesn't make it any less dangerous.”

Even with weaker winds, Milton is expected to remain a major hurricane until it makes landfall Wednesday night.

After landing, it is expected to cross the peninsula and head out to sea. The time on land robs the storm of the energy it draws from the ocean's heat, and the storm will weaken rapidly, just as the coma slows down, Lin said.

break the eerie silence

A new report from the World Weather Attribution Group on Hurricane Helen, which made landfall in Florida on September 26, shows that climate change has caused the storm's wind speeds to increase by 11% and total precipitation to increase by approximately It was found that there was a high possibility of an increase of 10%.

Researchers said they expect Milton to behave similarly, but even worse because of climate change.

Warmer-than-normal ocean conditions in the North Atlantic and Gulf of Mexico and the emergence of a hurricane-related La Niña weather pattern led forecasters to predict a very active hurricane season this spring.

But even in mid-September, the typical peak of hurricane activity, the season remained eerily quiet, leaving researchers perplexed, despite the ocean heat that fuels hurricanes. , making us wonder if their positive predictions were wrong.

The eerie calm was broken in late September as Hurricanes Helen and Milton roared into view. If Milton makes landfall, it will be the second-highest number of hurricane landfalls in a year on the Gulf Coast.

“This makes 2024 the second-highest number of Gulf hurricane landfalls on record, along with 2005 and 2020, after 1886,” meteorologist Philip Klotzbach said. I wrote to X.

Source: www.nbcnews.com

Genetic study uncovers ancient Easter Islander’s resilience and connections to pre-European contact in the Americas

Easter Island, also known as Rapa Nui, is one of the most isolated inhabited places in the world. Its archaeological record, including megalithic statues, has captured the imagination of many. Two major controversies have emerged from extensive study of the island. First, its history is presented as a cautionary tale of overexploitation of resources leading to a large-scale population decline – the “ecocide” theory. Second, the possibility of a voyage across the Pacific Ocean to the Americas before European contact is still debated. To answer these questions, a team of scientists from the Globe Institute and elsewhere sequenced and analyzed the genomes of 15 Rapa Nui people who lived between 1670 and 1950.

Rapa Nui people. Image courtesy of © Santiago Caruso.

Rapa Nui is one of the most isolated inhabited islands in the world.

It lies at the easternmost tip of the Polynesian Triangle in the Pacific Ocean, 3,700 km west of South America and over 1,900 km east of the nearest inhabited island.

Despite Rapa Nui's remote location, archaeological and genetic evidence indicates that Polynesians from the west had already arrived on the island around 1250 AD.

Over the next five centuries, Rapa Nui's inhabitants, the Rapanui, developed a culture characterized by iconic colossal stone statues (moai) and monumental stone platforms (ahu).

Due to Rapa Nui's isolation, Europeans did not reach the island until 1722 AD.

Over the years, European visitors have had a devastating impact on Rapa Nui, killing locals and introducing deadly pathogens the islanders had never encountered before.

Moreover, a third of the population was kidnapped by Peruvian slave raiders in the 1860s, and only a small proportion were repatriated following international condemnation of slavery.

A smallpox epidemic subsequently decimated Rapanui's population, down to an estimated 110 people.

“It is well known that Rapa Nui's environment was affected by human activities such as deforestation, but it was unknown whether and how these changes led to a dramatic population decline,” said Dr Anna Saffo Malaspinas, a researcher at the University of Lausanne and the Swiss Institute of Bioinformatics.

The Tahitian warrior's shelter from Giulio Ferrario's Le Costume Ancien et Moderne, Milan, 1816-1827.

The authors studied the genomes of 15 ancient inhabitants who lived on the island over the past 500 years.

They found no evidence of a genetic bottleneck corresponding to the 17th century collapse.

The analysis suggests that the island was originally inhabited by a small number of people, but its population grew steadily until Peruvian slave raids in the 1860s forced a third of the island's population to relocate.

Furthermore, the analysis showed that, like modern-day Rapa Nui people, the ancient islanders also carried Native American DNA.

This mixing probably occurred sometime between 1250 and 1430 AD.

Taken together with archaeological evidence and oral history, the find suggests that Polynesians may have been crossing the Pacific long before Europeans arrived on Rapa Nui and long before Columbus reached the Americas.

“Our genetic analysis shows that there was a steady population growth from the 13th century until contact with Europeans in the 18th century,” said Dr Barbara Souza da Mota, a researcher at the University of Lausanne.

“This stability is extremely important because it directly contradicts the idea of ​​a dramatic pre-contact population decline.”

“We investigated how Native American DNA is distributed in the genetic background of Rapa Nui Polynesians,” said Dr Victor Moreno Mayar, a researcher at the Globe Institute at the University of Copenhagen.

“This distribution is consistent with contact occurring between the 13th and 15th centuries.”

“Our study doesn't tell us where this contact occurred, but it may mean that the ancestors of the Rapanui reached the Americas before Christopher Columbus,” Dr Malaspinas said.

of Survey results Published in a journal Nature.

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JV Moreno Mayal others2024. Ancient Rapanui genome reveals resilience and pre-European contact with the Americas. Nature 633, 389-397;doi: 10.1038/s41586-024-07881-4

Source: www.sci.news

Neanderthal fossil genome uncovers ancient tribe isolated for centuries

The jawbone of a Neanderthal known as Thorin, thought to have belonged to an isolated group

Xavier Mus

Genetic analysis of Neanderthal fossils found in France has revealed that they are the remnants of a previously unknown lineage of ancient people that remained extremely isolated for more than 50,000 years, shedding new light on the final stages of the species' existence.

The fossil has been named Thorin, after a character from J.R.R. Tolkien's novels. The HobbitIt was discovered in 2015 in the Mandolin Cave in the Rhône Valley in southern France. Ludovic Slimak Researchers from the Centre for Human Biology and Genomics in Toulouse discovered a few teeth in the soil of the cave, and after nine years of painstaking excavation, they uncovered 31 teeth, a jawbone, part of a skull, and thousands of other bone fragments.

The discovery of so many fossils of Neanderthals, who lived in Eurasia from about 400,000 to 40,000 years ago and are now extinct, is extremely rare and a surprising find in itself.

Even more surprising, even though DNA doesn't normally preserve in warm climates, a fragment of Thorin's tooth yielded his genome, revealing that the fossil was male but solving a mystery that will take years to unravel.

Srimak and his colleagues compared Thorin's genome with those of other Neanderthals and estimated that he lived about 105,000 years ago, but archaeological evidence and isotope analysis of his bones clearly show that Thorin lived no more than 50,000 years ago, making him a “late Neanderthal” from the final stage of Neanderthal existence.

“We have been together for a long time [geneticists] “We were confident that Thorin was indeed an early Neanderthal precisely because his genetic lineage is very distantly related to modern Neanderthals from the same region,” the team said. Tarshika Vimala “On the one hand, archaeologists were convinced he was a late Neanderthal. It took years of work on both sides to arrive at the answer,” said a researcher from the University of Copenhagen.

Eventually, the researchers realized they must have discovered a previously unknown Neanderthal lineage: Thorin was part of a small group that lived between 42,000 and 50,000 years ago. This group was likely a remnant of a much older Neanderthal population that split off from the main Neanderthal population about 105,000 years ago and remained genetically isolated for more than 50,000 years afterwards.

Thorin's bones unearthed in the Mandolin Cave in France

Ludovic Slimak

Thorin's DNA showed no evidence of interbreeding between his lineage and the main Neanderthal population, despite their close proximity. “Thorin was completely different from other Neanderthals,” Slimak says.

This isolation may have made this population particularly vulnerable: “Prolonged isolation and inbreeding can reduce genetic diversity over time, which is detrimental to a population's survival, which in turn can negatively affect its ability to adapt to a changing environment,” Vimala says.

Srimak, Vimala and their colleagues then reanalyzed the genome of another Neanderthal who lived about 43,000 years ago at Les Côtés in France, and found traces in its DNA of a “ghost population” that interbred with another, previously unknown, Neanderthal group about 15,000 to 20,000 years ago.

“This means that there weren't just two populations among late Neanderthals, but possibly three,” says Slimak. Previously, it was thought that all Neanderthals before their extinction were part of a single genetically similar population.

“The evidence from Mandrin Cave is very exciting because it gives us fascinating insights into late Neanderthal populations and their movements.” Emma Pomeroy At Cambridge University.

topic:

Source: www.newscientist.com

Research uncovers evidence of active volcanoes on the moon during the dinosaur era

New research suggests that volcanoes on the Moon were active during the time of the dinosaurs on Earth, but much more recently than previously believed.

Three small glass beads gathered from the lunar surface by a Chinese probe in 2020 indicate volcanic activity on the Moon 120 million years ago, according to the study. The findings were published Thursday in the journal Science.

Initial analysis of samples collected by the Chang’e-5 lunar mission suggested that volcanic activity ceased approximately 2 billion years ago, updating an earlier evaluation that the Moon had been devoid of active volcanoes for about 4 billion years.

Researchers examined around 3,000 lunar glass beads that may have been produced by volcanic eruptions or meteorite impacts, identifying three of them as of volcanic origin based on their texture and chemical makeup.

The research team expressed being “surprised and excited” by their “unexpected” discoveries.

The presence of relatively recent lunar volcanism “implies that a small celestial body like the Moon may have retained enough internal heat to support activity until very late,” co-authors Professor Li Qili and Associate Professor He Yuyang from the Institute of Geology and Geophysics, Chinese Academy of Sciences, shared in an email.

However, it remains “unclear” why the Moon has remained volcanically active for such a long period, as per the study.

Planetary volcanologist Qian Yuqi from the University of Hong Kong commented that identifying such a young volcano has “major” implications for the Moon’s development.

“Where did they originate from?” Qian, who was not part of the research, inquired in an email. “This could lead to future missions to search for them.”

The Chang’e-5 lunar mission marked the first return of lunar samples since the U.S. Apollo program in the 1970s and the Soviet Union’s Luna 24 mission. In June, China achieved a historic feat by retrieving rocks from the far side of the Moon through its Chang’e-6 mission.

Source: www.nbcnews.com

New study uncovers common, mysterious I motif structure in human genome DNA

The so-called i-motif is a knot-like DNA structure that forms in the nuclei of human cells and is thought to provide important genome control. Garvan Institute of Medical Research Other studies have used immunoprecipitation and next-generation sequencing to identify i-motif structures in human DNA.

Peña Martinez othersIn total, we observed 53,000 i-motifs across three human cell lines (MCF7, U2OS, and HEK293T). Image courtesy of Peña Martínez. others., doi: 10.1038/s44318-024-00210-5.

The I motif is a DNA structure that differs from the iconic double helix shape.

These form when runs of cytosine letters on the same DNA strand pair up with each other to form a four-stranded twisted structure that juts out from the double helix.

In 2018, scientists at the Garvan Institute of Medical Research were the first to successfully directly visualize i-motifs inside living human cells, using new antibody tools they developed to recognise and bind to the i-motifs.

The new study expands on these findings by using the antibody to identify the location of i-motifs throughout the genome.

“In this study, we have mapped more than 50,000 i-motif sites in the human genome that are found in all three cell types we looked at,” said Professor Daniel Crist from the Garvan Institute of Medical Research, lead author of the study.

“This is a surprisingly high number for a DNA structure whose presence in cells was once a matter of debate.”

“Our findings confirm that the i-motif is not just an object of laboratory study, but is widespread and likely plays an important role in genome function.”

The researchers found that i-motifs are not scattered randomly, but are concentrated in important functional regions of the genome, including those that control gene activity.

“We found that the i-motif is associated with genes that are highly active at specific times in the cell cycle,” said lead author Cristian David Peña Martinez, PhD, also of the Garvan Medical Institute.

“This suggests that it plays a dynamic role in regulating gene activity.”

“We also discovered that i-motifs are formed in the promoter regions of cancer genes. For example, MYC Oncogenes encode one of cancer’s most notoriously ‘untreatable’ targets.”

“This opens up exciting opportunities to target disease-related genes through i-motif structures.”

“The widespread presence of the i-motif near these 'holy grail' sequences implicated in hard-to-treat cancers opens up new possibilities for novel diagnostic and therapeutic approaches,” said study co-author Sarah Kummerfeld, PhD, a researcher at the Garvan Medical Institute.

“It may be possible to design drugs that target the i-motif to affect gene expression, potentially expanding current treatment options.”

Team result Published in EMBO Journal.

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Christian David Peña Martinez othersi-motif structures are widely distributed in human genomic DNA. Embo JPublished online August 29, 2024, doi: 10.1038/s44318-024-00210-5

Source: www.sci.news

France uncovers new species of abelisaurid dinosaur

Paleontologists have added a new species to Europe's Cretaceous dinosaur fauna, discovered in Normandy, France.

Abelisaurid teeth are associated with the holotype specimen. Caletodraco CottardiImages/Photos Courtesy of Buffetaut others., doi: 10.3390/fossils2030009.

Caletodraco Cottardi It lived in what is now France during the Cenomanian period of the Early Cretaceous period, about 100 million years ago.

The ancient species Fuuriusauriais a derived subgroup of abelisaurid dinosaurs (medium-to-large bipedal predators that dominated the Late Cretaceous carnivore fauna of the ancient southern supercontinent Gondwana) previously known only from South America.

“My family Abelisauridae Built in 1985, the museum features Abelisaurus komafuensis“It was a large carnivorous dinosaur that lived in the Campanian formation of Patagonia,” said Dr Eric Baffeteau from PSL Research University and his colleagues.

“It has since become clear that Abelisauridae actually constitute a major lineage of neoceratopsid theropods, and played an important role in the Cretaceous continental ecosystems of South America, Africa, the Indian subcontinent, and Madagascar.”

“The Abelisauridae are mainly distributed in Gondwana, but in 1988 abelisaurids were reported from the Late Cretaceous of southern France, and are now known from Cretaceous localities in several European countries, including France, Spain, Hungary and the Netherlands.”

Two blocks containing fossilized bones and teeth Caletodraco Cottardi The fossils were excavated by paleontologist Nicolas Cotard at the foot of the sea cliffs of Saint-Jouin-Bruneval, on the coast of the Caux department in the Seine-Maritime department in Normandy, northwest France.

“The glauconitic chalk layers of the Pays de Caux are marine deposits, as suggested in this case by the presence of a shark's tooth in the matrix close to one of the bones of the anterior block,” the paleontologists said.

“The nearest land mass where the dinosaur described below could have lived must have been the Armorica Massif, about 100 km to the southwest.”

“The dinosaur specimens must have somehow been transported to the ocean, possibly by a river, and then drifted quite a long distance before sinking to the ocean floor.”

“Dinosaur fossils are fairly common in marine deposits, but this appears to be the first record from the Late Cretaceous of the Pays de Caux. The only relatively common vertebrate fossils in the region are fish teeth.”

Presence of the furiosaur Abelisaurus Caletodraco Cottardi This dinosaur, discovered in the Cenomanian of Normandy, suggests that the history of abelisaurids in Europe may have been more complex than previously thought.

“discovery Caletodraco Cottardi “This study shows that dinosaur fossils, although extremely rare, are present in the chalk layers of the Anglo-Paris Basin and that a careful search for vertebrate fossils in these marine layers may yield surprising and important results,” the researchers said.

“This new species has led to a re-evaluation of the European abelisaurid fossil record and shows that, contrary to what was previously assumed, majungasaurus was not the only abelisaurid subspecies present in that geographic region. Caletodraco Cottardi It clearly belongs to the Furileusauridae, a highly derived clade of the Abelisauridae.”

Caletodraco Cottardi It is one of the oldest known furyleusaurids and its discovery in Europe leads us to reconsider the biogeographic history of this theropod group, previously known from South America.”

a paper The findings were published in an online journal. Fossil Research.

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Eric Buffett others2024. Caletodraco Cottardi: A new abelisaurid (Dinosauria: Theropoda) from the Cenomanian Chalk of Normandy (northwestern France). Phos. Stud 2 (3): 177-195; doi: 10.3390/fossils2030009

Source: www.sci.news

VLBA uncovers groundbreaking information on the magnetars with the fastest spin rates

Swift J1818.0-1617 is located about 22,000 light-years away in the constellation Sagittarius.



Artist's impression of magnetar Swift J1818.0-1617. Image courtesy of NSF/AUI/NRAO/S. Dagnello.

Swift J1818.0-1617, discovered in 2020, rotates with a rotation period of 1.36 seconds and is thought to be the fastest rotating magnetar yet discovered.

The star is located on the opposite side of the Milky Way galaxy's bulge, 22,000 light-years away, making it relatively close to Earth.

In fact, it's so close that we can use parallax to pinpoint its 3D location within the galaxy.

The lifespan of magnetars is currently unknown, but astronomers estimate that Swift J1818.0-1617 is only a few hundred years old.

“A magnetar's bright X-ray emission requires a mechanism of extremely high-energy outflow. Only the rapid decay of its powerful magnetic field can explain the force behind these spectral features,” said Dr. Hao Ding, an astronomer at the National Astronomical Observatory of Japan, and his colleagues.

“But again, this is an extreme process: for normal stars on the main sequence, bright blue stars burn through their fuel much faster than yellow stars, and therefore have very short lifetimes.”

“In the case of magnetars, although the physics are different, their lifetimes are also thought to be shorter than those of pulsars.”

“Magnetars are too young to continue releasing energy at this rate for long periods of time,” the researchers added.

“Moreover, magnetars can also exhibit radiation in the lower end of the electromagnetic spectrum, i.e. at radio wavelengths.”

“In these cases, the most likely energy source is synchrotron radiation produced by the magnetar's rapid rotation.”

“In synchrotron radiation, the plasma surrounding the neutron star itself is so tightly attached to the surface of the star that it rotates at very close to the speed of light and produces radiation at radio wavelengths.”

Astronomers NSF's Very Long Baseline Array (VLBA) was conducted over a three-year period to collect data on the position and velocity of Swift J1818.0-1617.

“The VLBA provided excellent angular resolution to measure this extremely small disparity, and the spatial resolution is unmatched,” said Dr Ding.

Swift J1818.0-1617's parallax is the smallest of any neutron star, and its so-called transverse velocity is the smallest of any magnetar (a new lower limit).

“Velocity in astronomy can be most simply described as having two components: direction and velocity,” the researchers explained.

“Radial velocity tells us how fast we're moving along the line of sight. In this case, radial velocity means the speed along the radius of the galaxy.”

“For magnetars like Swift J1818.0-1617, which are located on the opposite side of the central bulge, there is too much other material in the way to accurately measure the radial velocity.”

“Transverse velocity, sometimes called proper velocity, describes motion perpendicular to the galactic plane and is more easily identifiable.”

Astronomers are trying to understand the common (and different) formation processes between regular neutron stars, pulsars and magnetars, and hope to use precise measurements of the transverse velocities to analyse the conditions under which stars evolve along one of these three paths.

“This study adds weight to the theory that magnetars are unlikely to form under the same conditions as young pulsars, and suggests that magnetars are born from a more unconventional formation process,” Dr Ding said.

“We need to know how fast magnetars were moving when they were first born. The mechanism by which magnetars form is still a mystery, and we want to find out.”

Source: www.sci.news

New Study Uncovers that Komodo Dragons Have Iron-Covered Teeth

Komodo dragon (Komodo dragon coatiThe Komodo dragon is the largest living predatory lizard, and its serrated, curved, blade-like teeth provide valuable analogues for studying tooth structure and function and for comparison with extinct species such as theropod dinosaurs. The Komodo dragon's teeth only have a thin layer of enamel, but they are still capable of meeting the piercing and pulling feeding demands. A new study reveals that the Komodo dragon's teeth have unique adaptations to maintain their sharpness, with serrations and an orange layer of iron-rich material at the tips of the teeth.

The pigmented cutting edge of a Komodo dragon tooth. Image courtesy of LeBlanc others., doi:10.1038/s41559-024-02477-7.

Native to Indonesia, the Komodo dragon is the largest extant monitor lizard.

These creatures can grow up to 3 metres (10 feet) in length and run at speeds of up to 20 kilometres (12 miles) per hour.

They have sharp, curved teeth similar to those of many carnivorous theropod dinosaurs.

They eat almost any type of meat, from small reptiles and birds to deer, horses and buffalo, tearing and tearing at the flesh of their prey.

“The Komodo dragon, the world's largest lizard, is indisputably an impressive animal,” said Dr Benjamin Tapley, curator of reptiles and amphibians at the Zoological Society of London.

“Having worked with them at London Zoo for 12 years, I continue to be fascinated by them and this latest discovery only further highlights how incredible they are.”

“Komodo dragons are sadly endangered and this discovery not only improves our understanding of how this iconic dinosaur lived, but also helps us to better appreciate this magnificent reptile as we work towards conservation.”

To understand the chemical and structural makeup of Komodo dragon teeth, Dr Tapley, researcher Aaron LeBlanc of King's College London and their colleagues scoured museums for Komodo dragon skulls and teeth.

They also studied the teeth of Ganas, a 15-year-old Komodo dragon who lived at London Zoo.

Using advanced imaging and chemical analysis, the researchers were able to observe that the iron in Komodo dragon enamel is concentrated in a thin coating on the serrations and tips of the teeth.

This protective layer keeps the serrated edges of the teeth sharp and ready to use.

“Komodo dragons, like carnivorous dinosaurs, have curved, serrated teeth for tearing apart their prey,” Dr LeBlanc said.

“We hope to use these similarities to learn more about how carnivorous dinosaurs ate and whether they used iron in their teeth, like the Komodo dragon.”

“Unfortunately, with current technology we can't tell you whether fossil dinosaur teeth had a lot of iron or not.”

“We suspect that chemical changes that occur during fossilization may obscure how much iron was originally present.”

“But what we found is that large carnivorous dinosaurs like Tyrannosaurus had changed the structure of the enamel on the cutting edges of their teeth.”

“So while the Komodo dragon changed the chemical composition of its teeth, some dinosaurs changed the structure of their tooth enamel to maintain a sharp cutting edge.”

“Further analysis of Komodo's teeth may reveal other markers within the iron coating that were not altered during fossilization.”

“With these markers, we can know for sure whether dinosaurs also had iron-plated teeth, giving us a better understanding of these ferocious predators.”

of Investigation result Published in a journal Natural Ecology and Evolution.

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ARH LeBlanc othersKomodo dragon teeth encrusted with iron and intricate dental enamel of carnivorous reptiles. Nat Ecol EvolPublished online July 24, 2024, doi: 10.1038/s41559-024-02477-7

Source: www.sci.news

Cassini uncovers the properties of Titan’s hydrocarbon sea

Saturn’s moon Titan was explored by NASA’s Cassini spacecraft between 2004 and 2017. Although Cassini revealed much about this Earth-like world, its radar observations provided limited information about Titan’s liquid hydrocarbon oceans: Kraken, Ligeia, and Punga Mare. New paper In the journal Nature CommunicationsCornell University researcher Valerio Poggiali and his colleagues reported the results of their analysis of data from the Cassini radar experiment on Titan’s polar oceans.

Artistic depiction of Kraken Mare, a giant ocean of liquid methane on Titan. Image courtesy of NASA John Glenn Research Center.

“The Cassini spacecraft explored Saturn’s largest moon, Titan, between 2004 and 2017, revealing an Earth-like world with a strange yet very familiar diversity of surface morphologies formed by a methane-based hydrological system operating in a dense nitrogen atmosphere,” said Dr Poggiali and his co-authors.

“Winds in the lower atmosphere move the sediments, forming the vast sand dunes that encircle Titan’s equator.”

“At mid-latitudes, flat, relatively featureless plains form the transition between the eolianite-dominated equator and the lacustrine-dominated poles.”

“In the polar regions, large oceans and small lakes of liquid hydrocarbons dominate the landscape.”

“The channels created by precipitation drain into the ocean, forming estuaries and sometimes deltas and other familiar coastal deposits.”

“Cassini has revealed much about Titan, but this discovery raises even more questions.”

For the study, scientists used data from four bistatic radar observations collected by Cassini during four flybys in 2014 (May 17, June 18, and October 24) and 2016 (November 14).

For each, surface reflections were observed when the probe was closest to Titan (approach) and when it was moving away (exit).

The authors analyzed data from outflow observations of Titan’s three large polar oceans: Kraken Mare, Ligeia Mare, and Punga Mare.

“In a bistatic radar experiment, a spacecraft directs a radio beam towards a target, in this case Titan, where the beam is reflected towards a receiving antenna on Earth,” the researchers explained.

“This surface reflection is polarized, which means it provides information gathered from two independent perspectives, as opposed to the perspective provided by monostatic radar data, where the reflected signal is sent back to the spacecraft.”

“The main difference is that the bistatic information is a more complete data set and is sensitive to both the composition of the reflective surface and its roughness.”

The team found that the composition of the ocean’s surface layers of hydrocarbons varies depending on latitude and location (for example, near rivers or estuaries).

Specifically, the southernmost parts of Kraken Mare exhibit the highest dielectric constant, a measure of a material’s ability to reflect radio signals.

For example, water on Earth is highly reflective and has a dielectric constant of about 80, while Titan’s ethane and methane oceans have a dielectric constant of about 1.7.

The researchers also determined that ocean conditions in all three areas were fairly calm during the flyby, with surface waves measuring less than 3.3 mm.

Slightly higher levels of roughness, up to 5.2 mm, were found in coastal areas, near estuaries and straits, which could be an indication of tidal currents.

“There are also indications that the rivers that feed the oceans are pure methane until they flow into the open ocean liquid, which is rich in ethane,” Dr Poggiali said.

“It’s the same as when freshwater rivers flow into the saltwater of the ocean on Earth and mix together.”

“This fits well with weather models of Titan, which predict that the ‘rain’ falling from Titan’s skies is almost pure methane, with traces of ethane and other hydrocarbons,” said Professor Philip Nicholson of Cornell University.

“Further studies of the data Cassini has collected during its 13-year exploration of Titan are already underway.”

“There’s still a mountain of data waiting to be fully analyzed in a way that will lead to further discoveries. This is just the first step.”

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V. Poggiali others2024. Surface characteristics of Titan’s ocean as revealed by the Cassini bistatic radar experiment. Nat Community 15, 5454; doi: 10.1038/s41467-024-49837-2

This article is a version of a press release provided by Cornell University.

Source: www.sci.news

IXPE uncovers a new extremely luminous X-ray source in our galaxy

Cygnus X-3It is an X-ray binary system located about 7,400 parsecs (24,136 light years) away in the constellation Cygnus, and analysis of the data indicates that it is a type of extremely luminous X-ray source. NASA’s Imaging X-ray Polarimetry Probe (IXPE).



The halo around Cygnus X-3. Image courtesy of NASA.

“X-ray binaries are interesting systems that consist of two objects: a normal star and a compact object such as a black hole or neutron star that sucks material from the companion star,” explained astronomer Aleksandra Beredina from the University of Turku and her colleagues.

“To date, several hundred such sources have been identified in our Milky Way galaxy.”

“When it comes to the most powerful phenomena in the Universe, the release of gravitational energy in binary X-ray systems stands out as an extremely efficient process.”

“Among the first X-ray binary systems discovered in the Universe is the Cygnus X-3 system,” the researchers added.

“Since the early 1970s, this binary system has been noted for its ability to briefly appear as one of the most powerful radio sources, only to fade or disappear completely after a few days.”

“This unique feature prompted early efforts to coordinate astronomical observations around the world through telephone coordination.”

“The peculiar behaviour of this system during this short-lived, high-energy event contrasts with its normal nature and led to it being named ‘Astronomical Mystery Cygnus X-3’ by R.M. Helming in 1973.”

“Since then, there have been numerous efforts to understand its properties.”

Dr. Veredina and her co-authors used the Imaging X-ray Polarimetry Explorer to measure the X-ray polarization of Cygnus X-3.

“The X-ray polarization images provide insight into the composition of matter surrounding the compact object in Cygnus X-3,” the researchers said.

“We found that this compact object is surrounded by a dense, opaque membrane of material.”

“The light we see is a reflection from the inner walls of a funnel formed by the surrounding gas, similar to a cup with a mirror on the inside.”

“Cygnus X-3 is a type of Ultraluminous X-ray source (ULX), which consumes material at such a rate that a significant portion of the infalling material does not fall within the event horizon, but rather is ejected out of the system.”

“ULXs are usually observed as points of light in images of distant galaxies, and their radiation is amplified by the focusing effect of the funnel around the compact object, acting like a megaphone,” said Professor Juri Poutanen from the University of Turku.

“But these sources are so far away – thousands of times the extent of the Milky Way – that they appear relatively faint to X-ray telescopes.”

“This discovery reveals that luminous counterparts to these distant ULXs exist within our own Galaxy.”

“This important discovery marks a new chapter in our investigation into the source of this extraordinary universe, providing an opportunity to study its extreme matter consumption in detail.”

of result Published in the journal Natural Astronomy.

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A. Veredina othersIXPE discovered Cygnus X-3 as an ultra-luminous X-ray source in the galaxy. Nat AstronPublished online June 21, 2024, doi: 10.1038/s41550-024-02294-9

Source: www.sci.news

Webb uncovers puzzling alignment of protostellar outflows in the Ophiuchus Nebula

These protostellar outflows form when jets of gas from the newborn star collide with nearby gas and dust at high speeds, and the objects typically point in different directions within a single region. Serpens NebulaBut like sleet falling during a storm, they all lean in the same direction and to the same degree.

This Webb image shows a collection of outflows from a line of protostars in one small region (upper left corner) of the Ophiuchus Nebula. Image credit: NASA / ESA / CSA / STScI / K. Pontoppidan, NASA Jet Propulsion Laboratory / J. Green, Space Telescope Science Institute.

“So how does the alignment of a stellar jets relate to the star's rotation?” said Webb.

“When interstellar gas clouds collapse to form stars, they rotate faster.”

“The only way for the gas to keep moving inward is to remove some of its spin (called angular momentum).”

“A disk of material forms around the young star, carrying material downward like a vortex around a drain.”

“The swirling magnetic fields within the inner disk cause some of the material to be ejected as twin jets, erupting outward in opposite directions, perpendicular to the disk of material.”

“In Webb's images, these jets are identified by bright red lumpy streaks, which are shock waves created when the jets collide with the surrounding gas and dust.”

“Here, the red color indicates the presence of molecular hydrogen and carbon monoxide.”

“Webb will be able to image these very young stars and their outflows, which have previously been blocked at visible wavelengths of light.”

“There are several forces that can change the direction of the outflow during this period in the young star's life.”

“One way is that the binary stars rotate around each other, causing them to wobble, twisting the direction of the outflow over time.”

The Serpens Nebula is a so-called reflection nebula located about 1,300 light-years away in the constellation Serpens.

The object is estimated to be between 1 and 2 million years old, making it very young in cosmic terms.

“The Serpens Nebula contains a particularly dense cluster of protostellar clusters (approximately 100,000 years old) at the center of this image, some of which will eventually grow to the mass of the Sun,” the astronomers said.

“It's a reflection nebula, meaning it's a cloud of gas and dust that doesn't emit its own light but glows by reflecting light from nearby and internal stars.”

“Thus, throughout the field of this image, the filaments and lint of different hues represent reflected light from protostars still forming within the cloud.”

“In some areas there is dust in front of that reflection, which shows up here as a diffuse shade of orange.”

“There have been several other serendipitous discoveries in the region, including the shadow of a flapping bat, so named because 2020 data from the NASA/ESA Hubble Space Telescope revealed it to be flapping, or migrating. This feature is visible in the centre of the Webb image.”

of Investigation result Published in Astrophysical Journal.

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Joel D. Green others2024. Why are (almost) all of the protostar outflows aligned with Serpens Main? ApJin press.

Source: www.sci.news

Amazing Discovery: JWST Uncovers Abundance of Supernovae in Early Universe

Many of the circled objects represent previously unknown supernovae.

Collaboration between NASA, ESA, CSA, STScI and JADES

Astronomers using the James Webb Space Telescope (JWST) have discovered a surprising number of supernovae in the distant universe, including some of the most distant yet seen. Their discoveries increase the number of known supernovae in the early universe by a factor of ten.

The researchers imaged the same small patch of sky twice, in 2022 and 2023, and found 79 new supernovae. “It’s actually very small, about the size of a grain of rice held at arm’s length,” the researchers said. Christa DeCourcy “We’ve spent more than 100 hours on JWST,” said Dr. [observing] I took my time with each image, which gives them a lot of depth.”

Astronomers then compared the two images with each other and with previous photos of the same area taken by the Hubble Space Telescope, looking for bright spots that appear in one image but not the other.

These specks are relatively faint stars that shone brightly before fading in bright supernova explosions. Some of them are candidates for the most distant supernovae ever found, although their distances have yet to be confirmed. And one of them is definitely the most distant one ever seen. This star exploded when the universe was only about 1.8 billion years old.

Such supernovae would have produced the heavy elements that are now widespread throughout the universe, so they would have had lower concentrations of these elements than modern supernovae. “The universe at this early stage was fundamentally different from what has been explored in the past by the Hubble Space Telescope and especially ground-based surveys,” he said. Justin Pierre “This is really new territory that JWST is breaking into,” he said during a presentation at the Space Telescope Science Institute in Maryland, where observations could help shed light on what the first stars were like.

topic:

  • Performer/
  • James Webb Space Telescope

Source: www.newscientist.com

New research uncovers that the Great Oxidation Event persisted for a minimum of 200 million years

About 2.5 billion years ago, free oxygen first began to accumulate in meaningful levels in Earth's atmosphere, setting the stage for the emergence of complex life. Scientists call this phenomenon Great Oxidation EventBut a new study led by researchers at the University of Utah suggests that Earth's early buildup of oxygen wasn't as simple as that moniker suggests.

The Great Oxidation Event refers to the transition from a slowly reducing Archean atmosphere-ocean system to an oxygen-rich atmosphere and shallow ocean during the early Paleoproterozoic. Image courtesy of Hadeano.

“The new data suggest that the early rise of oxygen in Earth's atmosphere was dynamic, possibly progressing intermittently up until 2.2 billion years ago,” said Dr Chadrin Ostrander, a researcher at the University of Utah.

“Our data validate this hypothesis and go a step further by extending this dynamics to the ocean.”

By analysing stable thallium isotope ratios and redox-sensitive elements, Dr Ostrander and his colleagues found evidence of fluctuations in ocean oxygen levels that are consistent with changes in atmospheric oxygen.

The discovery helps improve understanding of the complex processes that shaped oxygen levels on Earth at key times in its history and paved the way for the evolution of life as we know it.

“We have no idea what was going on in the oceans where Earth's earliest life forms are thought to have arisen and evolved,” Dr Ostrander said.

“So knowing the oxygen content of the ocean and how it evolved over time is probably more important for early life than the atmosphere.”

In 2021, researchers discovered that oxygen wasn't permanently present in the atmosphere until about 200 million years after the global oxygenation process began — much later than previously thought.

Definitive evidence for an anoxic atmosphere is the presence of rare mass-independent sulfur isotope signatures in the sediment record prior to the Great Oxidation Event.

There are very few known processes on Earth that could produce these sulfur isotope signatures, and atmospheric oxygen would almost certainly be absent for them to be preserved in the rock record.

For the first half of Earth's existence, its atmosphere and oceans were almost devoid of oxygen. This gas was likely produced by cyanobacteria in the oceans before the Great Oxidation Event, but during this early epoch the oxygen was rapidly destroyed in reactions with exposed minerals and volcanic gases.

Scientists found that traces of rare sulfur isotopes disappeared and reappeared, suggesting that atmospheric oxygen increased and decreased multiple times during the Great Oxidation Event – it wasn't a single “event.”

“When oxygen began to be produced, the Earth was not ready to be oxygenated. The Earth needed time to evolve biologically, geologically and chemically to encourage oxygenation,” Dr Ostrander said.

“It's like a seesaw. Oxygen is produced, but there's so much oxygen destruction that nothing happens.”

“We're still trying to figure out when the scales will tip completely and Earth will no longer be able to go back to an oxygen-free atmosphere.”

To map ocean oxygen levels during the Great Oxidation Event, the authors relied on expertise in stable thallium isotopes.

Thallium isotope ratios are sensitive to the burial of manganese oxides to the seafloor, a process that requires oxygen in seawater.

The team looked at thallium isotopes in the same ocean shales, which have recently been shown to be able to track fluctuations in atmospheric oxygen during the Great Oxidation Event, along with rare sulfur isotopes.

The researchers found a significant enrichment of the lighter isotope thallium-203 in the shale, a pattern best explained by the burial of manganese oxides on the ocean floor and the buildup of oxygen in the water.

These enrichments were found in the same samples that lacked the rare sulfur isotope signature, meaning the atmosphere was no longer anoxic, and they disappeared once the rare sulfur isotope signature reappeared.

These findings were supported by redox-sensitive element enrichments, a more classical means of tracing ancient oxygen changes.

“The sulfur isotopes indicate that the atmosphere was oxygenated, and the thallium isotopes indicate that the oceans were oxygenated,” Dr Ostrander said.

“Sulfur isotopes indicate that the atmosphere has become anoxic again, and thallium isotopes indicate the same for the oceans.”

“So the atmosphere and oceans were simultaneously oxygenating and deoxygenating. This is new and exciting information for people interested in the ancient Earth.”

of Investigation result Published in the journal Nature.

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Ostrander Commercial othersCoupled oxygenation of the atmosphere and oceans began 2.3 billion years ago. NaturePublished online June 12, 2024, doi: 10.1038/s41586-024-07551-5

Source: www.sci.news

New study uncovers how African elephants give each other distinct names

WASHINGTON — African elephants communicate through calls and respond to their own names, a behavior rarely observed in the wild, according to a new study published Monday.

These names are embedded in the elephants’ distinctive low-pitched vocalizations that carry across the savanna, suggesting that animals with intricate social structures, where family units frequently disband and reunite, are more likely to have individual names.

Ecologist Stuart Pimm from Duke University, who was not involved in the study, remarked, “If you’re managing a large family, you need to be able to call out, ‘Hey, Virginia, come over here!'”

The phenomenon of animals calling each other by name is exceptionally rare in the wild. Humans have names, allowing us to call out to others, and pets like dogs also respond to their names. Baby Dolphin Birds have their own unique names, known as signature whistles, while parrots may also utilize names.

These named species possess the ability to learn and produce distinct sounds throughout their lives, a skill elephants also share.

Biologists conducted research on wild ecology and evolution using machine learning to identify name usage in audio recordings of savanna elephant vocalizations captured in Kenya’s Samburu National Reserve and Amboseli National Park.

By observing the elephants from vehicles, researchers were able to determine which elephants were calling and responding to each other, such as a mother calling for her calf or an older female reaching out to a stray elephant later rejoining the group.

The computer model, analyzing the audio data likely containing names, accurately predicted the addressed elephant 28% of the time, compared to just 8% with meaningless data.

Lead author Mickey Pardo, a biologist at Cornell University, explained, “Like humans, elephants utilize names, but we can’t rely on them entirely as they likely don’t use names in the majority of their vocalizations.”

Elephants incorporate sounds beyond the human hearing range in their calls, leaving scientists uncertain about the specific vocal components that form an elephant’s name.

To validate their findings, researchers played the recordings to individual elephants. The elephants showed heightened responses, including ear flapping and trunk lifting, to recordings containing their names. Some elephants even disregarded vocalizations meant for other elephants.

“Elephants are highly social beings, constantly communicating and interacting, and this system of naming could be a fundamental aspect of their communication abilities,” noted co-author George Wittemyer, an ecologist at Colorado State University and a science advisor for Save the Elephants.

“We’ve provided a glimpse into the elephant’s cognitive world.”

Source: www.nbcnews.com

Webb uncovers high levels of hydrocarbons in protoplanetary disks surrounding ultra-low-mass stars

Very low-mass stars orbit rocky exoplanets more frequently than other types of stars. The composition of these planets is poorly understood, but it is thought to be related to the protoplanetary disk in which they form. In the new study, astronomers used the NASA/ESA/CSA James Webb Space Telescope to investigate the chemical composition of the planet-forming disk around ISO-ChaI 147, a red dwarf star just one-tenth the mass of the Sun. They identified emission from 13 carbon-containing molecules, including ethane and benzene.

This is an artist's impression of a young star surrounded by a disk of gas and dust. Image courtesy of NASA/JPL.

ISO-ChaI 147 It is a red dwarf star with a mass 0.11 times that of the Sun, located about 639 light years away in the constellation Chamaeleon.

The star was observed as part of the MIRI Mid-Infrared Disk Survey (MINDS), which aims to bridge the gap between the chemical composition of the disk and the properties of exoplanets.

These observations provide insight into the environments and fundamental elements for the formation of such planets.

Astronomers discovered that the gas in ISO-ChaI 147's planet-forming region is rich in carbon.

This could be due to carbon being removed from the solid material from which rocky planets form, which could explain why Earth is relatively carbon-poor.

“WEBB has greater sensitivity and spectral resolution than conventional infrared space telescopes,” said Dr Aditya Arabavi, an astronomer at the University of Groningen.

“These observations are not possible from Earth because the radiation is blocked by the atmosphere.”

“So far we have only been able to identify acetylene emissions from this object.”

“But Webb's high sensitivity and spectral resolution allowed us to detect faint emissions from fewer molecules.”

“Thanks to Webb, we now know that these hydrocarbon molecules are not only diverse, but abundant as well.”

The spectrum of ISO-ChaI 147 shows the richest hydrocarbon chemical composition ever observed in a protoplanetary disk, consisting of 13 carbon-containing molecules. Image credit: NASA/ESA/CSA/Ralf Crawford, STScI.

The spectrum of ISO-ChaI 147 is Webb's mid-infrared measuring instrument (MIRI) displays the richest hydrocarbon chemical composition ever observed in a protoplanetary disk, consisting of 13 carbon-containing molecules up to benzene.

This includes the first extrasolar detection of ethane, the largest fully saturated hydrocarbon detected outside the solar system.

Fully saturated hydrocarbons are expected to form from more basic molecules, so detecting them here can give researchers clues about their chemical environment.

Astronomers also detected ethylene, propyne, and methyl radicals in a protoplanetary disk for the first time.

“These molecules have already been detected in our solar system, for example in comets such as 67P/Churyumov-Gerasimenko and C/2014 Q2 (Lovejoy),” Dr. Arababi said.

“It's amazing that we can now see these molecules dancing in the cradle of the planet.”

“This is a completely different environment to how we normally think of planet formation.”

The team note that these results have significant implications for the astrochemistry within 0.1 AU and the planets that form there.

“This is very different to the composition found in disks around solar-type stars, where oxygen-containing molecules (such as carbon dioxide and water) dominate,” said Dr Inga Kamp, also from the University of Groningen.

“This object proves that these are unique classes of objects.”

“It's incredible that we can detect and quantify the amount of a molecule that's well known on Earth, such as benzene, in an object more than 600 light years away,” said Dr Agnes Perrin, an astronomer at the French National Center for Scientific Research.

Team result Published in today's journal Science.

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AM Arabavi other2024. Abundant hydrocarbons present in a disk around a very low-mass star. Science 384, 6700: 1086-1090; doi: 10.1126/science.adi8147

Source: www.sci.news

Ancient Norwegian archaeologist uncovers Stone Age leader’s visage

The skeletal remains of a 4,000-year-old Scandinavian man were discovered in 1916. Hitla island, Norway.

The male Hitra was approximately 169 cm tall, had blond hair and blue eyes. Image courtesy of Thomas Foldberg/Åge Hojem/NTNU University Museum.

“In 1916, the road up the hill to the Fausland farm on the island of Hitra was being renovated using gravel from the coast along the deepest part of Balmsfjorden,” said Dr. Birgitte Skarr of the NTNU University Museum. a colleague said.

“Suddenly, the workers noticed human bones among the sand and stones.”

“The bones belonged to an approximately 25-year-old man who died at the end of the Stone Age, 4,000 years ago.”

“He is believed to have drowned. At the time of his death, the sea level would have been 12.5 meters higher than it is now, and the site of his discovery would have been at a depth of 4 meters.”

Archaeologists also found and studied a Hitraean dagger and arm guard.

“The arm guard is a rectangular bone with two holes that would have been attached to the wrist of the bow hand,” they said.

“The guard protects your wrist from the impact of the bowstring when you shoot an arrow.”

“These pieces of equipment may indicate that he was a warrior.”

“It is impossible to determine whether the drowning was the result of a fight or an accident,” Dr. Skarr said.

“What we do know is that the Hitraeans lived in a very turbulent time.”

“Up until that point, most people lived as hunter-gatherers, and agriculture only became fully established in Norway at the end of the Stone Age, during the time of the Hitra people.”

“Although elements of agriculture had been introduced earlier in southern and eastern Norway, agriculture was first established during this period in central Norway, along the coast of western Norway, and in northern Norway.”

“We believe that agriculture was introduced by settlers who came to Norway to obtain more land, and they were willing to use weapons to do so.”

“So we have to expect violent clashes between the people who were already living here and the newcomers.”

“New people brought new knowledge to the country, not just about animal husbandry and agriculture, but also about other ways of organizing society.”

“They lived in a class society, had different worldviews, different religions, and large networks that spanned Europe.”

“This knowledge led to major political, economic, and social changes.”

“There is still much we don’t know about this dramatic period in Scandinavian history, and research continues.”

“His DNA is currently being analyzed at the Lundbeck Foundation Geogenetics Center at the University of Copenhagen.”

Source: www.sci.news

Recent study uncovers prehistoric salmon with fang-like teeth akin to a “saber-toothed tiger”

An extinct species of giant salmon called Oncorhynchus lastrosus They boasted a pair of front teeth that protruded like fangs from the sides of their mouths, according to new research.

Oncorhynchus lastrosus: (A) CT model of the holotype. (B) Holotype seen from the front of the skull, before complete preparation and CT scanning. (C) Artist-rendered male iconic fish skull with accurate spike-tooth configuration. (D) Artist's rendering of a complete female iconic fish with precise spike tooth configuration. Scale bar blocks – 1 cm each.Image credit: Clairson other., doi: 10.1371/journal.pone.0300252.

Oncorhynchus lastrosus It lived along the Pacific coast of North America (California, Oregon, and Washington) about 11 million to 5 million years ago.

This extinct species was first described in the 1970s from fossils discovered in the freshwater Gateway locality of the Madras Formation near the town of Gateway, Jefferson County, Oregon.

The fish was 2.4 to 2.7 meters (7.9 to 8.9 feet) long and weighed, by some estimates, close to 177 kilograms (400 pounds), making it the largest known member of its family. Salmonidae To live forever.

This species migrated from the Pacific Ocean to inland rivers to spawn, much like salmon today. And it was placophagous based on its numerous gill rakes and few small teeth.

but Oncorhynchus lastrosus It had two upper teeth, 2–3 cm (0.8–1.2 in) long.

Initially, paleontologists thought that these oversized teeth were oriented backwards in the mouth, like fangs, mainly because the tooth fossils were found separated from the rest of the skull. was. This led to the common name “saber-toothed tiger.”

However, through new CT scans and various analyses, Oncorhynchus lastrosus Using fossils collected over the years, Professor Kellyn Cresson of the Philadelphia College of Osteopathic Medicine and her colleagues were able to confirm that the fish's teeth did indeed point sideways out of its mouth, like a warthog.

“As a result, this species should be renamed 'spine-toothed salmon,'” the paleontologists said.

“It is unclear exactly what these teeth were used for, but it is likely that they were used for fighting other spiny-toothed salmon, for defense against natural predators, or as tools for digging nests. ”

“It is also possible that the teeth were used for multiple purposes,” the researchers added.

“However, the teeth were probably not used to capture prey. Oncorhynchus lastrosus It is believed that it was a filter feeder that fed on plankton. ”

“We've known for decades that these extinct salmon in Central Oregon were the largest of all time. Discoveries like ours mean they're probably more than just gentle giants. It shows that there was no such thing,” Professor Cresson said.

“The giant spines on the tips of their snouts would have helped them protect themselves from predators, compete with other salmon, and eventually build nests to incubate their eggs.”

“We are pleased to be able to give a new face to the giant spiny salmon and bring knowledge from the Oregon field to the world,” said University of Oregon researcher and director Dr. Edward Davis. Condon Collection, University of Oregon Museum of Natural and Cultural History.

“We also emphasize that females and males alike had huge fang-like teeth. So both sexes were equally terrifying,” said Professor Brian Sidlauskas, curator of fishes at Oregon State University. said.

team's result It was published in the magazine PLoS ONE.

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KM watercress other. 2024. From the saber to the spike: Reconstruction of an ancient giant sexually dimorphic Pacific salmon from a new angle. Oncorhynchus lastrosus (Salmonidae: Salmonini). PLoS ONE 19 (4): e0300252; doi: 10.1371/journal.pone.0300252

Source: www.sci.news

Mars Express uncovers mysterious ‘spider’ near ‘Inca City’ on Martian outskirts

ESA’s Mars Express spacecraft found obvious traces of spider. They are scattered in the south pole region of Mars.

This image of an Inca city on Mars was taken on February 27, 2024 by the high-resolution stereo camera on board ESA’s Mars Express spacecraft. Image credit: ESA / DLR / FU Berlin.

“The Martian ‘spiders’ are not actual spiders, but form when spring sunlight falls on layers of carbon dioxide deposited during the dark winter,” said a member of the Mars Express team.

“Sunlight turns the carbon dioxide ice at the bottom of the layer into gas, which then accumulates and breaks through the ice sheet above.”

“During Mars’ spring, the gas explodes, dragging black material down to the surface as it progresses and shattering layers of ice up to a meter thick.”

“The resulting gas, laden with black dust, erupts through cracks in the ice in the form of tall fountains and geysers, before falling down and sinking to the surface.”

This creates a dark spot 45 m to 1 km (148 to 3,280 ft) in diameter.

This same process carves a distinctive “spider-shaped” pattern beneath the ice. Therefore, these black spots are evidence that a spider may be lurking underneath.

“Dark spots can be seen throughout the Mars Express image. But most of them can be seen as small specks in the dark region on the left, located just on the outskirts of a part of Mars called Inca City.” said the researchers.

“The reason for this name is no mystery: the network of linear, almost geometric ridges recalls Inca ruins.”

More formally known as Angustus Labyrinth. Inca City was discovered in 1972 by NASA’s Mariner 9 spacecraft.

“We still don’t know exactly how Inca cities formed. Sand dunes may have turned to stone over time,” the scientists said.

“Perhaps materials such as magma or sand are seeping through fractured sheets of Martian rock. Alternatively, the ridges could be ‘eskers,’ tortuous structures associated with glaciers.”

“The ‘walls’ of Inca cities appear to be part of a larger circle, 86 km (53.5 miles) in diameter.”

Scientists suspect that Inca City is located inside a large crater formed when rocks from space collided with the planet’s surface.

“This impact may have caused the fault to ripple in the surrounding plains, which was then filled with rising lava and then worn away over time,” the researchers said.

Source: www.sci.news

Ancient Canoe Uncovers Early Advances in Navigation Technology

More than 7,000 years ago, Neolithic people used technologically sophisticated boats to navigate the Mediterranean Sea, according to a new study.


The 7,300-year-old canoe Marmotta 1 is on display at the Museum of Civilization in Rome. It is a huge dugout canoe made from an oak trunk, approximately 10.43 meters long, 1.15 meters wide at the stern, and 0.85 meters wide at the bow. Depending on the part of the canoe, the height is 65 to 44 cm. Image credit: Gibaja other., doi: 10.1371/journal.pone.0299765.

Many of Europe's most important civilizations were born along the Mediterranean coast.

The Phoenicians, Greeks, Romans, and Carthaginians took advantage of the virtually enclosed sea to move quickly between islands along the coast.

At various times in history, the Mediterranean Sea has been a space of travel and a means of communication.

However, one of the major migration phenomena in history occurred during the Neolithic period, when rural societies began to spread around Europe and North Africa.

The beginning of the Neolithic period is recorded in the Near East around 10,000 BC, but communities from that region gradually occupied the entire Mediterranean Sea around 7500-7000 BC, reaching the coast of Portugal around 5400 BC.

In a new study, Dr. Juan Guibaja and colleagues from Spain's National Research Council dug out a tree from La Marmotta, a Neolithic lakeside village near Rome, Italy, between 5700 and 5100 BC. Five dugout canoes that were built were investigated.

Analysis revealed that the canoe was constructed from four types of wood, which is unusual for similar sites, and incorporated advanced construction techniques such as lateral reinforcement.

Three T-shaped wooden objects are also associated with one canoe, each with a series of holes that may have been used to secure ropes tied to sails or other nautical elements. there is.

These features, together with previous reconstruction experiments, indicate that these are seaworthy vessels, a conclusion supported by the presence of stone tools associated with nearby islands.

“These canoes are exceptional examples of prehistoric vessels, and their construction required a well-organized and specialized workforce, as well as a detailed understanding of structural design and wood properties,” the researchers said. said.

“The similarities between these canoes and modern navigation technology support the idea that many major advances in sailing took place during the early Neolithic period.”

“Direct dating of a Neolithic canoe discovered at La Marmotta reveals it to be the oldest in the Mediterranean and provides valuable insight into Neolithic navigation,” the study said. they added.

“Our research reveals the remarkable technological sophistication of early agricultural and pastoral communities, highlighting their woodworking skills and complex shipbuilding.”

of study Published in an online journal PLoS ONE.

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JF Gibaha other. 2024. The first Neolithic ship in the Mediterranean: the settlement of La Marmotta (Anguillara Sabazia, Lazio, Italy). PLoS ONE 19 (3): e0299765; doi: 10.1371/journal.pone.0299765

Source: www.sci.news

Webb uncovers incredible black hole in the ancient cosmos

Using the NASA/ESA/CSA James Webb Space Telescope, astronomers observed a very red quasar-like object. A2744-QSO1 Its color suggests that A2744-QSO1's black hole lies behind a thick veil of dust obscuring much of its light. The researchers also measured the black hole's mass (40 million solar masses) and found it to be much more massive compared to its host galaxy than what has been seen in more localized examples. . This discovery suggests that it may represent the missing link between black hole seeds and the first luminescent quasars.



A composite color image of A2744-QSO1. Image credit: Furutaku other, doi: 10.1038/s41586-024-07184-8.

“We were very excited when Webb started transmitting its first data,” said Dr. Lukas Furtak, a postdoctoral researcher at Ben-Gurion University of the Negev.

“As we were scanning the data coming in for the UNCOVER program, three very compact objects with red flowers stood out to us.”

“Because of its 'red dot' appearance, we immediately suspected it to be a quasar-like object.”

“Using a numerical lensing model we built for the Abell 2744 galaxy cluster, we found that the three red dots are multiples of the same background light source seen when the universe was just 700 million years old. “We determined that it must be an image of Adi Zitlin, also from Ben-Gurion University in the Negev.

“Analysis of the object's color shows that it is not a typical star-forming galaxy,” said Professor Rachel Bezanson, an astronomer at the University of Pittsburgh.

“This further supports the supermassive black hole hypothesis.”

“Together with its compact size, it became clear that this was probably a supermassive black hole, but it was still different from other quasars discovered earlier.”

The astronomers then analyzed the JWST/NIRSpec spectrum of A2744-QSO1.

“The spectrum was just shocking,” said Professor Ivo Rabe of Swinburne University of Technology.

“The spectrum obtained by combining the signals from the three images and the lens magnification corresponds to 1,700 hours that Webb observed the object without a lens, making it the deepest spectrum Webb obtained for a single object in the early universe. Masu.”

“Using the spectrum, we were able to not only confirm that this red compact object is a supermassive black hole and measure its precise redshift, but also estimate its mass based on the width of its emission line. We were able to get a solid estimate,” Dr. Furtak said.

“The gas orbits the black hole's gravitational field, achieving extremely high velocities not seen in other parts of the galaxy.”

“Due to the Doppler shift, the light emitted from the accreting material is redshifted on one side and blueshifted on the other side, depending on its velocity.”

“This makes the emission lines in the spectrum wider.”

But this measurement brought yet another surprise. The black hole's mass appears to be disproportionately large compared to the mass of its host galaxy.

“All the light in that galaxy would have to fit within a small region about the size of a modern star cluster,” said Dr. Jenny Green, an astronomer at Princeton University.

“The source's gravitational lensing magnification provided an exquisite constraint on size.”

“Even if you pack all possible stars into such a small region, the black hole will end up being at least 1% of the total mass of the system.”

“In fact, it has now been discovered that several other supermassive black holes in the early Universe exhibit similar behavior, which provides insight into the growth of black holes and host galaxies, and the interactions between them. This provides some interesting insights, but this is not well understood.”

Astronomers do not know whether such supermassive black holes grow from the remains of stars, for example, or perhaps from material that collapsed directly into black holes in the early universe.

“In some ways, this is an astrophysical chicken-and-egg problem,” says Professor Zitlin.

“Currently we don't know whether galaxies or black holes formed first, how big the first black holes were, and how they grew.”

“Recently, many more such 'little red dots' and other active galactic nuclei have been detected in the Webb, so we hope to have a better idea soon.”

of the team result appear in the diary Nature.

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LJ Furutak other. High black hole-to-host mass ratio in the lensed AGN of the early Universe. Nature, published online on February 14, 2024. doi: 10.1038/s41586-024-07184-8

Source: www.sci.news

An undisclosed ice base uncovers ethereal cosmic particles in Antarctica

Scientists have faced a challenge for nearly a century: How do you detect the undetectable, like the elusive neutrino? But now, in a groundbreaking discovery, neutrinos from elsewhere in the Milky Way have been detected for the first time, shedding light on a new era of neutrino astronomy.

The discovery of neutrinos has opened up new possibilities, and researchers like Steve Sclafani from the University of Maryland are excited about this new frontier. Neutrinos, the second most abundant elementary particles in the universe, are notoriously difficult to detect due to their elusive nature. When Austrian physicist Wolfgang Pauli proposed their existence in the 1930s, he thought they could never be detected, but he was proven wrong in 1956.

The discovery of neutrinos from outside the Milky Way was made possible by the IceCube Neutrino Observatory, a massive telescope located near the South Pole. By detecting high-energy neutrinos from distant galaxies, scientists are uncovering the mysteries of cosmic particle accelerators. These accelerators, like supermassive black holes, can provide clues about the origins of cosmic rays and other cosmic phenomena.

Small particles, huge targets

The IceCube detector, operated by a collaboration of scientists from around the world, works by detecting Cherenkov radiation emitted when high-energy neutrinos interact with the ice. This innovative approach allowed researchers to distinguish Milky Way neutrinos from other background signals, leading to the detection of hundreds of neutrinos over a 10-year period.

By studying the distribution of these neutrinos, scientists hope to learn more about the origins of cosmic rays and other high-energy phenomena in our galaxy. With plans to expand the IceCube observatory and improve detection methods, the future of neutrino astronomy looks promising.

Birth of neutrino astronomy

The detection of high-energy neutrinos from the Milky Way marks a new era in astronomy, providing researchers with a unique tool to study cosmic phenomena. By tracking these neutrinos back to their sources, scientists hope to uncover the mechanisms behind cosmic particle accelerators and other cosmic mysteries.

Neutrino astronomy offers a new perspective on the universe, allowing researchers to peer into the heart of energetic and turbulent environments near supermassive black holes. This discovery opens up a whole new window on the universe, providing invaluable insights into the workings of the cosmos.

New perspective

Neutrino astronomy has the potential to revolutionize our understanding of the universe, offering a rare glimpse into the inner workings of cosmic particle accelerators and other energetic phenomena. By studying the origins of high-energy neutrinos, researchers can uncover the mysteries of the cosmos and explore new frontiers in astrophysics. Exciting times lie ahead for neutrino astronomy, with new discoveries and advancements on the horizon.

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About our experts

Mirko Hünefeld from Dortmund University of Technology and Steve Sclafani from the University of Maryland are leading scientists in the field of neutrino astronomy. Their contributions to the IceCube observatory have helped advance our understanding of the universe and unlock new insights into cosmic phenomena.

Source: www.sciencefocus.com

Webb uncovers massive inactive galaxy with mature stars in the ancient cosmos

The formation of galaxies through the stepwise hierarchical coassembly of baryons and cold dark matter halos is a fundamental paradigm underpinning modern astrophysics and predicts a significant decline in the number of giant galaxies in the early Universe. . Very massive quiescent galaxies have been observed 1 to 2 billion years after the Big Bang. These form between 300 million and 500 million years ago and are very limiting for theoretical models, as only some models can form massive galaxies this early. The spectrum of newly discovered quiescent galaxy ZF-UDS-7329 reveals features typical of much older stellar populations. Detailed modeling shows that the stellar population formed about 1.5 billion years ago, when dark matter halos with sufficient host mass had not yet assembled in the standard scenario. This observation may indicate the existence of an undetected early population of galaxies and potentially large gaps in our understanding of the nature of early stellar populations, galaxy formation, and/or dark matter.



This web image shows ZF-UDS-7329, a rare massive galaxy that formed very early in the universe. Image credit: Glazebrook other., doi: 10.1038/s41586-024-07191-9.

Galaxy formation is a fundamental paradigm underpinning modern astrophysics, and a significant decrease in the number of massive galaxies in the early universe is predicted.

Very large quiescent galaxies have been observed 1 to 2 billion years after the Big Bang, casting doubt on previous theoretical models.

Professor Carl Glazebrook, from Swinburne University of Technology, said: “We have been tracking this galaxy for seven years, observing it for hours with two of the largest telescopes on Earth to find out its age.” Ta.

“But it was too red and too faint to be measured. In the end, we had to go outside Earth and use the web to see its properties.”

“This was truly a team effort, from the infrared sky survey that began in 2010 to identifying this galaxy as an anomaly, and the many hours spent with the Keck Telescope and the Very Large Telescope. But we couldn’t confirm it, and finally, last year, we spent a lot of effort trying to figure out how to process the web data and analyze this spectrum.”

“We are now beyond the realm of possibility to have identified the oldest giant stationary monster deep in the universe,” said Dr Temmiya Nanayakkara, an astronomer at Swinburne University of Technology.

“This pushes the limits of our current understanding of how galaxies form and evolve.”

“The key question now is how do stars form so quickly, so early in the universe, and how do they form at a time when other parts of the universe are forming stars? “What kind of mysterious mechanism could cause it to suddenly stop forming?”

“Galaxy formation is determined primarily by how dark matter is concentrated.”

“The presence of these extremely massive galaxies in the early universe poses significant challenges to our standard model of cosmology.”

“This is because dark matter structures large enough to accommodate these massive galaxies are unlikely to have formed yet.”

“More observations are needed to help us understand how common these galaxies are and how massive they really are.”

“This could open new doors in our understanding of the physics of dark matter,” Professor Glazebrook said.

“Webb continues to discover evidence that massive galaxies form early.”

“This result sets a new record for this phenomenon. It’s very impressive, but it’s just one object. But we want to discover more. If I If we were to do this, it would seriously disrupt our understanding of galaxy formation.”

This finding is reported in the following article: paper Published in this week’s magazine Nature.

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K. Glazebrook other. A huge galaxy that formed stars at z ~ 11. Nature, published online on February 14, 2024. doi: 10.1038/s41586-024-07191-9

Source: www.sci.news

The Hubble Telescope uncovers countless faraway galaxies in the constellation Cetus

New infrared images taken with wide field camera 3 (WFC3) onboard the NASA/ESA Hubble Space Telescope shows dozens of galaxies in the constellation Cetus, including SDSS J020941.27+001558.4, SDSS J020941.23+001600.7, and HerS J020941.1+001557. Masu.

This Hubble image shows a variety of distant galaxies in the constellation Cetus. Most galaxies are very small, but there are also some larger galaxies and some stars that can be seen in detail. At its center is an elliptical galaxy with a bright nucleus and a wide disk. A reddish, distorted ring of light surrounds its center, thicker on one side. Small galaxies intersect the rings as bright spots. Image credits: NASA / ESA / Hubble / H. Nayyeri / L. Marchetti / J. Lowenthal.

“What are we looking at when we study this image?” Hubble astronomers said in a statement.

“A distant galaxy 19.5 billion light-years away from Earth? Or a much closer (relatively) tiny glowing red galaxy 2.7 billion light-years away? Or a third galaxy that appears to be much closer to the second galaxy? Is not it?”

“The answer, perhaps confusingly, is that we are considering all three.”

“More precisely, we see light emitted from all of these galaxies, even though the farthest galaxy from Earth is directly behind the first.”

“In fact, it's that very alignment that makes the particular visuals of this image possible.”

“The bright spot in the center of this image is one of our closest galaxies, known by a long (but informative) name. SDSS J020941.27+001558.4,” they said.

“Another bright spot above it appears to be intersected by a curved crescent of light, SDSS J020941.23+001600.7, is the second closest galaxy. ”

“And finally, that curved crescent of light itself is 'lensed' light from a very distant galaxy. Girlfriend J020941.1+001557

Her J020941.1+001557 light was bent by the gravity of the foreground galaxy and expanded into a circular shape called an Einstein ring.

“Einstein rings occur when light from a very distant object bends around a large intermediate object,” the astronomers said.

“This is possible because the fabric of the universe itself, spacetime, is bent by mass, and so is light traveling through spacetime.”

“This is too subtle to observe at a local level, but when dealing with the curvature of light on large astronomical scales, for example when light emitted from a galaxy bends around another galaxy or galaxy cluster, , may become clearly observable.”

“When the lensed object and the lensed object are aligned in such a way, the result is a unique Einstein ring shape, with a complete or partial ring around the lensed object, depending on the precision of the alignment. A circle of light appears.

“This partial Einstein ring is of particular interest because it was identified thanks to a citizen science project. space warp — means that the public made the discovery of this object possible. ”

Source: www.sci.news

New research uncovers the ‘visual masking’ phenomenon in animal behavior

A strange phenomenon called visual masking can reveal the time scale of perception, but its underlying mechanisms are not well understood.

Colored plots show neural activity recorded in mouse visual cortex (V1). Each row of tick marks represents the spikes of a different neuron. Although researchers can predict the target side from neural activity with near-perfect accuracy, animal subjects often get incorrect masked trials due to how brain regions downstream of V1 process this information. I am.Image credit: Gail other.

Have you ever wanted to make something invisible? It turns out your brain can do it.

Unfortunately, this is a limited superpower. In visual masking, we do not consciously recognize another image when it appears in rapid succession.

But the timing of those images is important. For masking to work, the first image must flash very quickly, and the second image must follow rapidly (on the order of 50 milliseconds).

Don't get me wrong, the first image doesn't stay in view very long, but it's definitely long enough to be recognizable without the second image or mask.

Scientists discovered this phenomenon in the 19th century, but why and how the human brain does this remains a mystery.

“This is an interesting observation, that your perception doesn't accurately reflect what exists in the world,” said Dr. Sean Olsen, a researcher at the Allen Institute.

“Like other optical illusions, we think this tells us something about how the visual system works and, ultimately, the neural circuits underlying visual perception.”

In a new study, Dr. Olsen and colleagues take a closer look at the science behind this bizarre illusion and show for the first time that it also occurs in mice.

When the mice were trained to report what they saw, they were also able to pinpoint the specific areas of the brain needed for the visual masking illusion to work.

Dr. Christoph Koch, also from the Allen Institute, said, “Our research has narrowed down the region of the brain responsible for perceiving the world around us.''

“What are the steps from the time the photons rain down on your retina to when you actually become consciously aware of what you’re seeing?”

When a rain of photons hits our retina, the information follows a predetermined path from the eyeball through several different areas of the brain and into the highly-processed areas of the cortex, the wrinkled outermost shell of the brain. It ends with

Previous research on visual masking has led scientists to believe that neurons in the early part of the brain in the retina and its pathways are activated even when a person is unaware that they are looking at an image. I know. In other words, your brain sees things without your knowledge.

To explore where unconscious sensations turn into conscious perceptions and actions, scientists first asked 16 mice to move a small mouse in the direction of rapidly flashing images in exchange for a reward if they chose the correct direction. I trained him to spin a Lego wheel.

I then added different masking images on either side of the screen, immediately after the target image.

Adding a mask prevented the animal from performing the task correctly. This means that the animal can no longer recognize the original target image.

Because visual masking had never been tested in mice before, the authors had to create a task for mice, in which the images and the way they were presented were different from those used in previous human studies. I meant that.

To confirm that the optical illusion they showed to rodents was also relevant to us, they tested it on 16 people.

It turns out that human perception (or lack thereof) and mouse perception of this particular visual masking illusion are very similar.

The researchers then used a special technique known as optogenetics, which allowed them to quickly suppress activity in cells or areas throughout the brain with flashes of light.

They targeted this inhibition to the mouse's primary visual cortex, known as the first part of the cortex where visual information from the eyes enters higher cortical areas of the brain.

By turning off the primary visual cortex the moment the masking image appeared, they were able to completely block visual masking after the target image. Even though the masking image was visible, the mouse reverted to accurately locating the first image. the current.

This result implies that conscious perception is occurring in the visual cortex or in higher regions of the cortex downstream.

“This is consistent with the general idea in the field that the cortex is the seat of conscious cognition in mammals, including ourselves,” Dr. Koch said.

Although this study narrowed down the region responsible for conscious perception to the cortex, there are still many regions of the cortex that may be involved.

Further studies will need to silence these other areas to test their effects on visual masking tasks.

“We're starting to put some limits on where masking is occurring,” Dr. Olsen said.

“We think this is a good paradigm to track to track other areas that are listening to the primary visual cortex and essentially fusing the flow of target and mask information in the brain. Masu.”

of findings It was published in the magazine natural neuroscience.

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SD Gale other. Visual cortex is required for posterior masking in mice. nut neurosi, published online on November 13, 2023. doi: 10.1038/s41593-023-01488-0

Source: www.sci.news

New approach uncovers the complete chemical complexity of quantum decoherence

Rochester researchers have reported a strategy for understanding how molecules in completely chemically complex solvents lose their quantum coherence. This discovery opens the door to rational tuning of quantum coherence through chemical design and functionalization.

Credit: Annie Ostau de Lafon

This discovery can be used to design molecules with custom quantum coherence properties, laying the chemical basis for new quantum technologies.

In quantum mechanics, particles can exist in multiple states at the same time, which defies the logic of everyday experience. This property, known as quantum superposition, is the basis for new quantum technologies that promise to transform computing, communications, and sensing. However, quantum superposition faces a serious challenge: quantum decoherence. During this process, interaction with the surrounding environment disrupts the delicate superposition of quantum states.

Quantum decoherence challenges

To unlock the power of chemistry and build complex molecular architectures for practical quantum applications, scientists need to understand and control quantum decoherence so they can engineer molecules with specific quantum coherence properties. must be. To do so, we need to know how to rationally modify the chemical structure of molecules to modulate or alleviate quantum decoherence. To do this, scientists need to know the “spectral density,” a quantity that summarizes the speed at which the environment moves and the strength of its interactions with the quantum system.

A breakthrough in spectral density measurement

Until now, quantifying this spectral density in a way that accurately reflects molecular complexity has remained difficult in theory and experiment. However, a team of scientists has developed a way to extract the spectral density of molecules in a solvent using a simple resonance Raman experiment, a method that fully captures the complexity of the chemical environment.

A team led by Ignacio Franco, an associate professor of chemistry and physics at the University of Rochester, published their findings in Proceedings of the National Academy of Sciences.

Relationship between molecular structure and quantum decoherence

Using the extracted spectral density, we can not only understand how quickly decoherence occurs, but also determine which parts of the chemical environment are primarily responsible for decoherence. As a result, scientists can now map decoherence pathways and link molecular structure to quantum decoherence.

“Chemistry is built on the idea that molecular structure determines the chemical and physical properties of matter. This principle guides the modern design of molecules for medical, agricultural, and energy applications.” Using our strategy, we can finally begin to develop chemical design principles for emerging quantum technologies,” said Ignacio Gustin, a chemistry graduate student at the University of Rochester and lead author of the study.

Resonant Raman experiments: an important tool

The breakthrough came when the team realized that resonance Raman experiments provided all the information needed to study decoherence in its full chemical complexity. Although such experiments are routinely used to study photophysics and photochemistry, their usefulness for quantum decoherence had not been evaluated. The key insight was shared by David McCamant, an associate professor in the Department of Chemistry at the University of Rochester and an expert in Raman spectroscopy, and Jang Woo Kim, currently on the faculty at Chonnam National University in South Korea and an expert in quantum decoherence. This became clear from the discussion. He was a postdoctoral fellow at the University of Rochester.

Case study: Thymine decoherence

The researchers used their method to show for the first time how the superposition of electrons in thymine, one of the building blocks of humans, occurs. DNA, it takes only 30 femtoseconds (one femtosecond is one billionth of a billionth of a second) after absorbing ultraviolet light. They found that some vibrations within the molecule were dominant in the early stages of the decoherence process, while the solvent was dominant in the later stages. Furthermore, they found that chemical modifications to thymine significantly altered the decoherence rate, with hydrogen bonding interactions near the thymine ring resulting in more rapid decoherence.

Future implications and applications

Ultimately, the team’s research paves the way to understanding the chemical principles governing quantum decoherence. “We are excited to use this strategy to finally understand quantum decoherence in molecules of full chemical complexity and use it to develop molecules with robust coherence properties.” Franco said.

Reference: “Mapping the intramolecular electron decoherence pathway” by Ignacio Gustin, Chan Woo Kim, David W. McCamant, and Ignacio Franco, November 28, 2023. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.2309987120

Source: scitechdaily.com

New Research Uncovers the Secrets of Sarcomeres

Diagram of interacting thick and thin filaments within cardiac sarcomeres based on structural cryo-electron tomography data. Credit: MPI of Molecular Physiology

Scientists have captured the first true-to-life 3D images of the thick filaments of a mammal’s heart muscle.

Atrial fibrillation, heart failure, and stroke are among the serious health conditions that can result from hypertrophic cardiomyopathy and are important factors in sudden cardiac death in people under 35 years of age.

“The heart muscle is the central engine of the human body. Of course, if you know how engines are made and how they work, it’s easy to repair a broken engine,” says Stefan Lunser. say. “At the beginning of our study of muscle, we were able to use cryo-electron microscopy to visualize the structure of key muscle components and how they interact.”

“But these were still images of proteins taken from living cells. We just don’t teach them much,” Rounser said.

through thick and thin

Skeletal and cardiac muscles contract through the interaction of two types of parallel protein filaments (thin and thick) within the sarcomere. Sarcomeres are subdivided into several regions called zones and bands, and these filaments are arranged in different ways.

Thin filaments are composed of F-actin, troponin, tropomyosin, and nebulin. Thick filaments are formed by myosin, titin, and myosin-binding protein C (MyBP-C). The latter can form bonds between filaments, while the so-called motor protein myosin interacts with thin filaments to generate force and muscle contraction.

Thick filament structures within relaxed cardiac sarcomeres. The image above shows a tomographic slice of a cardiac sarcomere. Thin filaments are marked with green marks, thick filaments with purple arrows. The middle image shows reconstructed thick filaments (purple) and thin filaments (green). The image below shows the structure of thin filaments spanning several sarcomere regions. Scale bar indicates 50 nm. credit:
Molecular Physiology MPI

Muscle research milestones

“If we want to fully understand how muscles work at the molecular level, we need to delineate their components in their natural environment. This is one of the biggest challenges in biological research today. and cannot be addressed using traditional experimental approaches,” says Rounser.

To overcome this obstacle, his team developed an electron cryo-tomography workflow specifically for examining muscle samples. The scientists flash-frozen mammalian heart muscle samples produced by his Gautel group in London at very low temperatures (-175°C). ).

3D structure of a sarcomere showing thick filaments (purple) and thin filaments (green). Credit: MPI of Molecular Physiology

This maintains moisture and microstructure, keeping it pristine. Next, a focused ion beam (FIB milling) is applied to thin the sample to a thickness of approximately 100 nanometers, ideal for transmission electron microscopy, and multiple images are acquired while tilting the sample along its axis. Masu. Finally, computational methods reconstruct his three-dimensional image in high resolution.

In recent years, Raunser’s group has successfully applied customized workflows and recently published two groundbreaking publications. They created the first high-resolution images of sarcomeres and, so far, a misty muscle protein called nebulin. Both studies investigated the 3D organization of muscle proteins in sarcomeres, such as how myosin binds to actin to control muscle contraction, and how nebulin binds to actin to stabilize it and its We provide unprecedented insight into the 3D organization of muscle proteins in sarcomeres, including what determines their length.

complete the picture

In the current study, scientists have created, for the first time, high-resolution images of the heart’s thick filaments spanning several regions of the sarcomere. “With a length of 500 nm, this makes it the longest and largest structure ever resolved by cryo-ET,” said Davide Tamborini of MPI Dortmund, lead author of the study. Masu.

Even more impressive is the new insight gained into the molecular organization of the thick filaments and, by extension, their function. The arrangement of myosin molecules depends on their position within the filament.

Scientists believe that this allows the thick filaments to sense and process a large number of muscle-regulating signals and adjust the strength of muscle contractions depending on the sarcomere area. They also revealed how titin chains run along the filament. Titin chains intertwine with myosin and serve as a scaffold for its assembly, likely regulating length-dependent sarcomere activation.

“Our goal is to one day paint a complete picture of sarcomeres. The images of thick filaments in this study are ‘only’ snapshots of the muscle in its relaxed state. “We want to analyze sarcomeres in different states, such as during contraction, to fully understand how they function and how they are regulated,” says Rounser.

Comparisons with samples from patients with muscle diseases will ultimately contribute to a better understanding of diseases such as hypertrophic cardiomyopathy and the development of innovative treatments.

Reference: “Structure of native myosin filaments in relaxed cardiac sarcomeres” Davide Tamborrini, Zhexin Wang, Thorsten Wagner, Sebastian Tacke, Markus Stabrin, Michael Grange, Ay Lin Kho, Martin Rees, Pauline Bennett, Mathias Gautel, Stefan Raunser, 2023 October 32nd Nature.
DOI: 10.1038/s41586-023-06690-5

Source: scitechdaily.com

Study uncovers long-term health hazards

New research reveals significant metabolic and health risks associated with long-term coconut oil supplementation, including hormonal changes, weight gain, and inflammation. Lead researcher Marcio Alberto Torsoni advises against consuming coconut oil blindly and recommends a moderate amount according to dietary guidelines.

Scientists at the State University of Campinas observed changes in eating patterns, weight gain, signs of anxiety, and increased inflammation in the brain, adipose tissue, and liver in mice.

Article published in Functional food journal We report on a research study in which oral administration of extra virgin coconut oil supplements to mice showed significant changes in eating habits, weight gain, anxiety levels, and inflammation in the central nervous system, adipose tissue, and liver.

Researchers also discovered that leptin, an important metabolic hormone, insulin The ability to activate cellular mechanisms involved in satiety and blood sugar control may be impaired, and biochemical mechanisms involved in fat synthesis may be stimulated.

Researcher insights

Marcio Alberto Torsoni, a researcher at the Institute of Metabolic Disorders, said: “The results of this study suggest that although the process occurs slowly and quietly, long-term coconut oil supplementation contributes to the development of obesity and related comorbidities. “This suggests that it may cause significant metabolic changes.” LabDiMe) is conducted at the Faculty of Applied Sciences of the State University of Campinas (FCA-UNICAMP), São Paulo State, Brazil. He holds a PhD in Functional and Molecular Biology and completed postdoctoral studies at the UNICAMP Faculty of Medicine and the University of Michigan, USA.

LabDiMe is part of the Obesity and Comorbidity Research Center (OCRC), one of FAPESP’s Research, Innovation, and Dissemination Centers (RIDCs), and the Center for Metabolic Programming and Perinatal Management (MPPM), which receives funding from the U.S. We are collaborating with National Institutes of Health (NIH (National Institutes of Health).

Animal fat and coconut oil risks

Excessive intake of animal fats is associated with an increased risk of: cardiovascular disease, as well as obesity and diabetes. One of the components of this diet is cholesterol, but this type of fat also contains saturated fatty acids, which can activate inflammatory processes through Toll-like receptor 4 (TLR-4) and cause disease. there is.

Saturated fatty acids are also available from other sources, such as plants. For example, it makes up 90% of the fat in coconut oil. Although short-chain fatty acids make up the majority and are beneficial as they reduce inflammation, the saturated fatty acids found in coconut oil are sufficient to activate inflammatory pathways and damage many different types of cells.

“Consumption of coconut oil, either as part of the regular diet or as a dietary supplement, has increased significantly in the population,” Torsoni says. The problem is that most of the time it is consumed without the guidance of a nutritionist who can adjust the daily intake according to the individual’s needs.

experimental model

To find out whether daily consumption of coconut oil over long periods of time could cause health problems, the research group used an animal model involving healthy mice that were given coconut oil daily for eight weeks. did. This amount of coconut oil is equivalent to about 1 soup spoon (13g) of calories per day, or 5% of the calories from saturated fat in the diet of an adult of appropriate weight for his or her age and height.

Torsoni said coconut oil should be used in small amounts as part of seasonings and sauces, preferably with fresh or minimally processed vegetables. This is also the advice of the Ministry of Health’s Dietary Guidelines for Brazilian Citizens, which also recommends “an appropriate and healthy diet that combines quantity and quality and meets the needs of variety, balance, moderation and enjoyment.” I am.

“Coconut oil is not recommended as a supplement to treat disease or restore health,” Torsoni says.

Reference: “CO 2 supplementation induces lipogenesis in adipose tissue, leptin and insulin resistance in healthy Swiss mice” Alana Carolina Costa Veras, Larissa da Silva Bruzasco, Ana Beatriz Profiro Lopes, Beatriz da Silva Franco, Written by Alessandro Spencer de Souza Holanda, Andrea Maculano Estevez, Marcian Milanski, Adriana Souza Torsoni, Leticia Martins Ignacio-Sousa, Marcio Alberto Torsoni, June 4, 2023. Functional food journal.
DOI: 10.1016/j.jff.2023.105600

This study was funded by the São Paulo Research Foundation.

Source: scitechdaily.com