SEO-Optimized Title: “The Late Ordovician Mass Extinction: How It Laid the Foundation for the Evolution of Early Fish”

Posted on January 13, 2026 by Igor Mitreski

A significant enigma in vertebrate evolution—why numerous major fish lineages appeared suddenly in the fossil record tens of millions of years post their presumed origins—has been linked to the Late Ordovician mass extinction (LOME). This insight comes from a recent analysis conducted by paleontologists at the Okinawa Institute of Science and Technology Graduate University. The study reveals that the LOME, occurring approximately 445 to 443 million years ago, instigated a parallel endemic radiation of jawed and jawless vertebrates (gnathostomes) within isolated refugia, ultimately reshaping the early narrative of fishes and their relatives.

Reconstruction of Sacabambaspis jamvieri, an armored jawless fish from the Ordovician period. Image credit: OIST Kaori Seragaki

Most vertebrate lineages initially documented in the mid-Paleozoic emerged significantly after the Cambrian origin and Ordovician invertebrate biodiversity. This temporal gap is often attributed to inadequate sampling and lengthy ghost lineages.

However, paleontologists Kazuhei Hagiwara and Lauren Saran from the Okinawa Institute of Science and Technology Graduate University propose that the LOME may have fundamentally transformed the vertebrate ecosystem.

Utilizing a newly compiled global database of Paleozoic vertebrate occurrences, biogeography, and ecosystems, they identified that this mass extinction coincided with the extinction of stylostome conodonts (extinct marine jawless vertebrates) and the decline of early gnathostomes and pelagic invertebrates.

In the aftermath, the post-extinction ecosystems witnessed the initial definitive emergence of most major vertebrate lineages characteristic of the Paleozoic ‘Age of Fish’.

“While the ultimate cause of LOME remains unclear, clear changes before and after the event are evident through the fossil record,” stated Professor Saran.

“We have assimilated 200 years of Late Ordovician and Early Silurian paleontology and created a novel database of fossil records that will assist in reconstructing the refugia ecosystem,” Dr. Hagiwara elaborated.

“This enables us to quantify genus-level diversity from this era and illustrate how LOME directly contributed to a significant increase in gnathostome biodiversity.”

LOME transpired in two pulses during a period marked by global temperature fluctuations, alterations in ocean chemistry—including essential trace elements—sudden polar glaciation, and fluctuations in sea levels.

These transformations severely impacted marine ecosystems, creating post-extinction ‘gaps’ with reduced biodiversity that extended until the early Silurian period.

The researchers confirmed a previously suggested gap in vertebrate diversity known as the Thalimar gap.

Throughout this time, terrestrial richness remained low, and the surviving fauna consisted largely of isolated microfossils.

The recovery was gradual, with the Silurian period encompassing a 23-million-year recovery phase during which vertebrate lineages diversified intermittently.

Silurian gnathostome lineages displayed gradual diversification during an early phase when global biodiversity was notably low.

Early jawed vertebrates appear to have evolved in isolation rather than rapidly dispersing into ancient oceans.

The researchers noted that gnathostomes exhibited high levels of endemism from the outset of the Silurian period, with diversification occurring primarily in certain long-term extinction reserves.

One such refuge is southern China, where the earliest conclusive evidence of jaws is present in the fossil record.

These primitive jawed vertebrates remained geographically restricted for millions of years.

Turnover and recovery following LOME paralleled climatic fluctuations similar to those at the end of the Devonian mass extinction, including prolonged epochs of low diversity and delayed dominance of jawed fishes.

“For the first time, we discovered the entire body fossil of a jawed fish directly related to modern sharks in what is now southern China,” Dr. Hagiwara noted.

“They remained concentrated in these stable refugia for millions of years until they evolved the capability to migrate across open oceans to new ecosystems.”

“By integrating location, morphology, ecology, and biodiversity, we can finally understand how early vertebrate ecosystems restructured themselves after significant environmental disruptions,” Professor Saran added.

“This study elucidates why jaws evolved, why jawed vertebrates ultimately became widespread, and how modern marine life originated from these survivors rather than earlier forms like conodonts and trilobites.”

For more information, refer to the study published on January 9th in Scientific Progress.

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Kazuhei Hagiwara & Lauren Saran. 2026. The mass extinction that initiated the irradiation of jawed vertebrates and their jawless relatives (gnathostomes). Scientific Progress 12(2); doi: 10.1126/sciadv.aeb2297

Source: www.sci.news

First-Ever Measurement of Floating Exoplanet’s Mass by Astronomers

Posted on January 6, 2026 by Igor Mitreski

Gravitational microlensing surveys have unveiled populations of free-floating planets. Although their masses haven’t been directly measured due to distance-related challenges, statistics suggest that many of these rogue planets possess less mass than Jupiter. Recently, astronomers identified a groundbreaking microlensing event, termed KMT-2024-BLG-0792/OGLE-2024-BLG-0516. This event involved an exoplanet with approximately 21.9% of Jupiter’s mass, situated 9,785 light-years (3,000 parsecs) from the Milky Way’s center.

An artist’s impression of a free-floating exoplanet. Image credit: Sci.News.

Traditionally, planets are linked to stars, but research indicates that many traverse the galaxy independently.

Known as free-floating or rogue planets, these celestial bodies lack stellar companions.

Due to their low light emissions, they are primarily detected through their gravitational influences, a technique known as microlensing.

A significant challenge of this discovery method is determining the distances to these planets, complicating mass measurements.

This has left much of the data regarding these solitary objects speculative.

In a recent study, Dr. Subo Dong from Peking University and the National Astronomical Observatory of Japan and collaborators discovered a new free-floating planet, KMT-2024-BLG-0792/OGLE-2024-BLG-0516, via a brief microlensing event.

In contrast to prior approaches, they utilized a novel strategy by observing the microlensing phenomenon concurrently from Earth and space, leveraging multiple ground-based surveys alongside ESA’s Gaia space telescope.

Variations in the timing of light captured by these different locations facilitated measurements of microlens parallax, enabling researchers to calculate the planet’s mass and position through finite source modeling.

“Based on comparisons with the statistical characteristics of other microlensing events and simulation predictions, we conclude that this object didn’t originate as an isolated entity (like a brown dwarf) but likely formed within a protoplanetary disk (like a planet),” the astronomers noted.

“Subsequent dynamic processes likely ejected it from its formation site, resulting in a free-floating object.”

For further details, check out the study published in this month’s Science: paper.

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Subo Dong et al. 2026. Microlensing of free-floating planets caused by heavy objects in Saturn’s vicinity. Science 391 (6780): 96-99; doi: 10.1126/science.adv9266

Source: www.sci.news

First Measurement of Rare Saturn-Sized Rogue Planet’s Mass

Posted on January 1, 2026 by Igor Mitreski

Artist’s impression of a rogue planet capturing light from a distant source

Credit: J. Skowron/OGLE

Artist's impression of a rogue planet — Artist’s impression of a rogue planet capturing light from a distant source

Credit: J. Skowron/OGLE

Located nearly 10,000 light-years away, a Saturn-sized planet roams through the vacuum of space. This enigmatic rogue planet was discovered through the joint efforts of ground-based telescopes and the Gaia Space Telescope, marking the first time researchers have measured the mass of a free-floating exoplanet.

Typically, rogue planets found are either more massive than Jupiter or lighter than Neptune, creating a gap known as the “Einstein Desert.” This gap is attributed to the fact that lighter celestial bodies are more likely to be ejected from their stellar orbits, while heavier planets may form independently in open space, similar to stars.

This newly identified exoplanet is extremely rare and has been assigned two designations: KMT-2024-BLG-0792 and OGLE-2024-BLG-0516. Andrzej Udalski, along with researchers from the University of Warsaw, made this groundbreaking discovery using distinct ground-based telescopes. What makes it even more remarkable is its measured mass, which is approximately one-fifth that of Jupiter.

“What’s fascinating about this find is that it’s the first rogue planet we’ve measured in terms of mass, achievable through both Earth-based and Gaia observations,” says Gavin Coleman from Queen Mary University of London. The planet was detected via a method known as gravitational microlensing, occurring when light from a distant source is bent by the planet’s gravitational field, resulting in a halo effect around it. The alignment of the Gaia Space Telescope at the right moment allowed additional capture of this microlensing event.

“Mass is a crucial factor for classifying celestial bodies as planets,” Udalsky explains, confirming this as the first verified rogue planet. “This is a pivotal moment for recognizing that floating planets do indeed exist,” he added. The upcoming NASA Nancy Grace Roman Space Telescope, expected to launch in 2027, is anticipated to uncover even more such celestial discoveries.

“These planets should be quite numerous, with many being expelled from their original stellar systems during their formation’s early stages, providing key insights into how planetary systems develop,” Udalsky notes. This knowledge may contribute to understanding the formation of our own solar system, which some studies suggest may have inadvertently ejected planets in its early history.

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Source: www.newscientist.com

Astronomers Observe Coronal Mass Ejection from Young Sun-Like Star

Posted on October 28, 2025 by

On Earth, we may not often realize it, but the sun regularly ejects massive clumps of plasma into space known as coronal mass ejections (CMEs). Astronomers, utilizing the NASA/ESA Hubble Space Telescope along with ground-based telescopes in Japan and South Korea, have begun to detect signs of multi-temperature CMEs. EK Draconis, a young G-type main sequence star, is located 112 light-years away in the northern constellation Draco.

Artist’s depiction of the coronal mass ejection from EK Draconis. Image provided by: National Astronomical Observatory of Japan

“Researchers believe that CMEs may have significantly impacted the development of life on Earth, given that the Sun was quite active in its early days,” stated Kosuke Namegata, an astronomer at Kyoto University, along with his colleagues.

“Historically, studies have indicated that young stars similar to our Sun often produce intense flares that surpass the largest solar flares recorded in contemporary times.”

“The massive CMEs from the early Sun could have drastically influenced the primordial conditions on Earth, Mars, and Venus.”

“Nevertheless, the extent to which these youthful stellar explosions produce solar-like CMEs remains uncertain.”

“Recent years have seen the detection of cold plasma in CMEs via ground-based optical methods.”

“However, the high speeds and frequent occurrences of significant CMEs predicted in earlier studies have yet to be confirmed.”

In their investigation, the authors concentrated on EK Draconis, a youthful solar analog estimated to be between 50 million and 125 million years old.

Commonly referred to as EK Dra and HD 129333, the star shares effective temperature, radius, and mass characteristics that make it an excellent analog for the early Sun.

“Hubble captured far-ultraviolet emission lines sensitive to high-temperature plasma, while three ground-based telescopes simultaneously recorded hydrogen alpha lines tracking cooler gas,” the astronomers explained.

“These synergistic multi-wavelength spectroscopic observations enabled us to observe both the hot and cold components of the eruption instantaneously.”

This research presents the first evidence of a multitemperature CME originating from EK Draconis.

“Our findings indicate that high-temperature plasma at around 100,000 K was ejected at speeds ranging from 300 to 550 km/s, followed approximately 10 minutes later by a lower-temperature gas around 10,000 K ejected at a speed of 70 km/s,” the astronomers reported.

“The hotter plasma contained significantly more energy than the cooler plasma. This implies that frequent intense CMEs in the past may have sparked strong shocks and high-energy particles capable of eroding or chemically altering the early atmospheres of planets.”

“Theoretical and experimental research suggests that robust CMEs and high-energy particles could play a key role in generating biomolecules and greenhouse gases vital for the emergence and sustainability of life on early planets.”

“Consequently, this discovery carries substantial implications for understanding the habitability of planets and the conditions under which life may have arisen on Earth—and potentially elsewhere.”

The team’s study was published in the journal Nature Astronomy.

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Namekata K. et al. Signs of multi-temperature coronal mass ejections identified in a young solar analog. Nat Astron published online on October 27, 2025. doi: 10.1038/s41550-025-02691-8

Source: www.sci.news

Fossils from Tanzania and Zambia Illuminate the Permian Mass Extinction

Posted on August 12, 2025 by Igor Mitreski

Paleontologists have discovered a variety of animals, including saber-toothed predators, burrowing foragers, and large salamander-like creatures that flourished in southern Pangaea about 252 million years ago, just prior to the mass extinction of the Permian period.

Artistic rendering of an evening about 252 million years ago during the Late Permian Epoch in the Luangwa Basin, Zambia. This scene features several sabertooth Golgonopsians and Dishnodons in the beak. Image credit: Gabriel Ugueto.

“The extinction at the end of the Permian was catastrophic for life on Earth,” stated Professor Christian Saidal of the University of Washington.

“Yet, we do not have a complete understanding of which species managed to survive.

“The fossils we gather in Tanzania and Zambia provide a broader perspective on this remarkable period in our planet’s history.”

All new fossils were uncovered in three basins in southern Africa: the Roof Basin in southern Tanzania, the Luangwa Basin in eastern Zambia, and the Zambezi Central Basin in southern Zambia.

The majority were found by team members during several month-long excavation trips to the region over the past 17 years.

Others were analyzed from specimens excavated decades ago, preserved in museum collections.

“These regions in Zambia and Tanzania are home to incredibly well-preserved fossils from the Permian era,” Professor Saidal remarked.

“They provide us with an unparalleled glimpse into terrestrial life leading up to the mass extinction.”

The Permian period marks the conclusion of what paleontologists term the Paleozoic era.

During this time, animal life, which first emerged in our oceans, began to colonize land and developed complex terrestrial ecosystems.

The Permian epoch saw a diverse range of amphibians and reptile-like creatures inhabit environments ranging from early forests to arid valleys.

The mass extinction at the End-Permian wiped out many of these ecosystems, paving the way for the Mesozoic era, which witnessed the evolution of dinosaurs, the first birds, flowering plants, and mammals.

For decades, scientists relied on the Kalu Basin in South Africa for their best understanding of the Permian, the corresponding extinction, and the onset of the Mesozoic Era, which boasts nearly complete fossil records from before and after that mass extinction.

However, since the 1930s, paleontologists have noted that the fossil records in the Tanzanian and Zambian basins are comparably pristine.

This excavation represents the most extensive analysis of the local fossil record from the period surrounding the Permian mass extinction to date.

“The quantity of specimens found in Zambia and Tanzania is extraordinarily high, and their condition is so exquisite that paleontologists are able to draw species-level comparisons with those in South Africa,” Professor Sidor explained.

“We recognize that there is no better location on the planet to make such precise conclusions and comparisons to glean sufficient detail about this era.”

In the Series of 14 Articles published in Journal of Vertebrate Paleontology, researchers have detailed numerous new species of dicynodonts.

These small, burrowing, reptile-like herbivores first emerged during the Central Permian.

By the time of the mass extinction, the Dishnodons had beak-like snouts featuring two small tusks; many of them dug holes and became the dominant plant-eating animals on land.

The findings also uncover several large saber-toothed predators known as Golgonopsians, along with new species of amphibians, such as large salamanders.

“We can analyze two distinct geographical regions of Pangaea and observe the happenings before and after the Permian extinction,” Professor Saidal concluded.

“This allows us to explore critical questions regarding which species survived and which did not.”

Source: www.sci.news

How Ancient Mass Extinctions Revealed Earth’s Evolution into a Super Greenhouse

Posted on July 4, 2025 by Igor Mitreski

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Current forest die-offs due to global warming resemble those from the Permian and Triassic extinction events.

Ina Fassbender/AFP via Getty Images

Following a dramatic increase in carbon dioxide levels 252 million years ago, the death of forests resulted in enduring climate alterations, with the greenhouse effect persisting for millions of years.

Researchers striving to comprehend this phenomenon, which triggered the largest mass extinction in Earth’s history, caution that ongoing greenhouse gas emissions may lead to similar outcomes.

The extinction events of the Permian and Triassic are believed to have been triggered by extensive volcanic activity in what is now Siberia, elevating atmospheric CO2 concentrations.

The planet’s surface temperature soared by as much as 10°C, with average temperatures in the equatorial regions climbing to 34°C (93°F)—a rise of 8°C above the current average.

These extreme conditions persisted for roughly 5 million years, causing over 80% of marine species and upwards of 70% of terrestrial vertebrate families to become extinct, according to some estimates.

Although some scientists have recently posited that these mass extinction events may have limited effects on terrestrial ecosystems, Andrew Meldis from the University of Adelaide expresses confidence that life was nearly extinguished 252 million years ago.

“Small pockets of life might survive mass extinctions in isolated enclaves, but many areas within the Permian-Triassic fossil record reveal a complete ecosystem collapse,” notes Meldis.

He and his team scrutinized the fossil record to investigate why the Super Greenhouse event, which drives mass extinction, lasted five million years—far longer than the 100,000 years predicted by climate models.

The findings revealed that vast expanses of forests, originally with canopies of around 50 meters, were supplanted by resilient underground flora, typically ranging from 5 cm to 2 meters in height. Additionally, peat marshes, significant carbon storage ecosystems, vanished from tropical areas.

Employing computer models of Earth’s climatic and geochemical systems, researchers indicated that the depletion of these ecosystems contributes to elevated CO2 levels persisting for millions of years. This predominantly occurs because vegetation plays a crucial role in weathering, the mechanism that extracts carbon from the atmosphere and sequesters it in rocks and soil over extensive timescales.

With atmospheric CO2 levels rising rapidly, the parallels to the present are striking, asserts Meldis. As temperatures escalate, tropical and subtropical forests may find it increasingly challenging to adapt, potentially surpassing thresholds where vegetation ceases to maintain climate equilibrium.

Meldis explains that simply restoring former ecosystems will not lead to a “ping-pong effect.” He emphasizes that the atmosphere cannot be swiftly rejuvenated after the loss of the equatorial forest.

“You’re not transitioning from an ice house to a greenhouse and then back; the Earth will find a new equilibrium, which may differ significantly from prior states,” he elaborates.

Catlin Maisner, a researcher at the University of New South Wales—who was not involved in the study—describes reconstructing these events as analogous to “trying to assemble a jigsaw puzzle with many missing pieces,” yet acknowledges the team’s arguments as “plausible.”

However, she notes considerable uncertainty regarding oceanic processes during this period. “The ocean harbors far more carbon than land and atmosphere combined, and we still lack a comprehensive understanding of how marine biology, chemistry, and physical circulation were affected during that event,” cautions Meissner.

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Source: www.newscientist.com

How did crocodile ancestors survive two mass extinctions?

Posted on April 16, 2025 by Igor Mitreski

Crocodylomorphs are surviving members of a 230 million-year-old lineage called Crocodylomorphs, a group that contains live crocodiles (i.e. crocodiles, alligators, garials). The crocodile ancestors continued with two mass extinction events: the final mass extinction (2014 million years ago) and the final mass extinction (approximately 66 million years ago). One of the secrets of crocodile longevity is their extremely flexible lifestyle, both in what they eat and in the habitat they get.

Approximately 215 million years ago, it is a land crocodile in what is now northwestern Argentina. Hemiprotostus leali Prepare to eat early mammal relatives Chaliminia musteloides. Image credit: Jorge Gonzalez.

“Many of the groups closely associated with crocodiles exhibited more diverse, more abundant and different ecology, but disappeared except for these few generalist crocodiles who live today,” said Dr. Keegan Melstrom, a researcher at the University of Utah.

“Extinction and survival rate are two aspects of the same coin. Through all mass extinctions, some groups can last and diversify. What can we learn by studying the deeper evolutionary patterns given by these events?”

The Earth has experienced five mass extinctions in its history. Experts claim we are alive throughout the sixth, driven by habitat destruction, invasive species and climate change. Identifying traits that increase survival rates during planetary upheavals could help scientists and conservationists better protect today’s vulnerable species.

Historically, the field has seen mammals as poster children to understand the survival of mass extinction.

Despite their resilience, research has largely ignored alligator clades.

In a new study, Dr. Melstrom and colleagues reconstructed the food ecology of crocodiles and identified the properties that helped several groups to persist and thrive through the final Triassic and mass extinction of the Tododonians.

“There’s a risk that we’ll draw a conclusion millions of years ago and try to apply it directly to conservation. We have to be careful,” said Professor Randy Ilmith at the University of Utah.

“If people study mammals and reptiles and find the same pattern in terms of extinction survival, they may predict that species with a generalist diet will be better.”

“That information helps to make predictions, but it’s rare that you can choose which individual species survive.”

Living crocodiles are famous for being semi-aquatic generalists who thrive in lakes, rivers, and swamps and waiting to ambush unsuspecting prey. Noisy people, they aren’t. Young people enjoy tadpoles, insects, crustaceans and more before graduating to a larger fare, including fish, deer and even fellow crocodiles.

However, today’s crocodile’s uniform lifestyle obscures the massive dietary ecology that crocodiles flourished in the past.

A broader evolutionary group, including early crocodiles and many other extinct strains, Pseudosuchia ruled the land during the late Triassic period (237-2014 million years ago).

Early crocodiles were small to medium-sized creatures, rare in the ecosystem, and were mainly carnivorous animals that ate small animals.

In contrast, other pseudosu bone groups dominated the land, occupying a broad ecological role, exhibiting diverse body types and sizes of vertigo.

Despite their superiority, once a serious extinction hit, the non-crocodylomorph fake su did not survive.

Hypercarnivore crocodile also seemed to die, while generalists on earth went through it.

The authors assume that this ability to eat almost anything allowed them to survive, but many other groups have become extinct.

“Then it becomes a banana. Aquatic high carnivores, terrestrial generalists, terrestrial carbides, terrestrial herbivores – crocodiles have evolved a huge number of ecological roles throughout the age of dinosaurs,” Dr. Melstrom said.

Something happened in the late Cretaceous period and the crocodile faded.

Diverse ecology-focused lineages have begun to disappear even among the generalists on the ground.

Due to the mass extinction event of Cretatuas (separated by meteors that killed non-bird dinosaurs), most of the survivors are semi-predictive generalists and a group of aquatic carnivorous animals.

Nearly all 26 live crocodiles today are semi-rated generalists.

How do scientists analyze food on menus that are millions of years old? They analyze the shape of fossilized teeth and skulls to collect the basics of the animal’s diet.

The author visited museum collections of zoology and paleontology across seven countries and four continents to obtain the necessary fossil specimens.

They examined skulls of 99 extinct alligator species and 20 living crocodile species, creating a fossil dataset that spans 230 million years of evolutionary history.

They previously had built a living database of non-crocodilians, including 89 mammals and 47 lizard species.

The specimens represent a variety of vegetative ecology, ranging from strict carnivorous to mandatory herbivores and a wide variety of skull shapes.

As semiac ambush predators, today’s crocodiles primarily occupy a similar ecological role in many different environments.

They continue to have a very flexible diet. Perhaps it is a remnant of their deep, diverse evolutionary past.

For endangered crocodile people, such as Cuban crocodiles in the Himalayas’ hills and the swamps of the country’s Zapata, dietary flexibility may give us an opportunity to continue our current sixth mass extinction.

The biggest challenges these species face are habitat loss and human hunting.

“I hope that, rather than thinking about ferocious beasts or expensive handbags, when I see living crocodiles and crocodiles, people will appreciate their astonishing 20 million years of evolution and how they survived so many turbulent events in Earth’s history,” Professor Ilmith said.

“Crocodiles are equipped to survive many future changes if they are willing to help maintain their habitat.”

result It will be displayed in the journal Paleontology.

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Keegan M. Melstrom et al. 2025. For a while, Crocodile: Crocodile’s resilience to mass extinction. Paleontology 68(2): E70005; doi: 10.1111/pala.70005

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

Source: www.sci.news

A nearby supernova explosion could have triggered multiple mass extinctions on Earth

Posted on March 14, 2025 by Igor Mitreski

New research from Keele University and Universidad de Alicante shows that near Earth explosion Giant O and B type stars It occurs at a rate of 2.5 per billion years. This result supports the view that such an event may have caused one or more of the mass extinction events recorded on Earth.

Among the puppies in the constellation, I have the impression of the artist Zeta Puppis, an O-shaped star about 1,400 light years away. Image credit: Tahina Ramiaramanantsoa.

Astronomers at Kiel and Alicante University believe that the explosion of supernova near Earth could condemn both the late Devonian and Ordovician extinction events that occurred 372 and 445 million years ago, respectively.

Ordovician extinction killed 60% of marine invertebrates when life was largely confined to the ocean, and the late Devonian wiped out about 70% of all species, leading to a major change in the species of fish present in ancient seas and lakes.

Previous studies have not been able to identify a clear cause of either event, but are thought to be related to Earth's ozone layer depletion, which may have been caused by supernova.

A new study found that the velocity supernova that occurs near our planet coincides with the timing of both mass extinctions.

“Supernova explosions bring heavy chemical elements to interstellar media, which are used to form new stars and planets,” said Dr. Alexis Quintana, PhD from Kiel University, the lead author of the study.

“However, if planets, including Earth, are too close to events of this type, this can have devastating effects.”

“Supernova explosions are some of the most energetic explosions in the universe,” said Dr. Nick Wright, PhD from Keel University.

“If a large star explodes as a supernova close to Earth, the results will be devastating for life on Earth. This study suggests that this may already be happening.”

An artist impression of HR 6819, a close binary consisting of deleted B-shaped stars (background) and rapidly rotating BE stars (foreground). Image credit: ESO/L. Calsada.

Astronomers came to their conclusion after conducting a large-scale census of OB stars in the sun of Kiloparscheck (approximately 3,260 light years).

They studied the distribution of these stars to learn more about how clusters of stars and galaxies form using themselves as benchmarks, and the rate at which these stars form in our galaxies.

The census allowed researchers to calculate the rate at which supernovas occur within galaxies, which are important for supernova observations, and the rates that are important for the production of large-scale star rests, such as black holes and neutron stars throughout the universe.

Data will also help in the future development of gravitational wave detectors, a useful tool for scientists studying the structure and origin of the universe.

As part of this, the researchers calculated the supernova rate within the 20 parsecs (65 light years) of the Sun and compared this to the approximate velocity rate of mass extinction events on Earth that were previously attributed to nearby supernovas.

This exclusion events linked to other factors such as asteroid impacts and ice ages.

Comparing these datasets, experts found that their studies support the theory that supernova explosions are responsible for both the late Devonian and Ordovician extinction events.

“We calculated the supernova rate close to Earth, and we found that it coincides with the speed of mass extinction events on our planet, which are related to external forces such as supernova,” Dr. Wright said.

Astronomers believe it occurs in galaxies like the Milky Way at about one or two supernovas, or even lower speeds, but the good news is that there are only two nearby stars that can reach the supernova within the next million years or so.

“But both of these are over 500 light years from the US, and computer simulations have previously suggested that supernovaes at distance from Earth are likely to not affect our planet,” the author said.

Their study It will be published in Monthly Notices from the Royal Astronomical Society.

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Alexis L. Quintana et al. 2025. Census of AB stars within 1 kpc and collapse rate of star formation and core collapse Supernova rate. mnrasin press; arxiv: 2503.08286v1

Source: www.sci.news

New fossil findings show a variety of terrestrial ecosystems 75,000 years post-Endopermian mass extinction

Posted on March 13, 2025 by Igor Mitreski

Searching for the land refugia is essential for human survival during the hypothetical sixth mass extinction. Studying comparable crises in the past can provide insights, but there is no evidence of fossils of diverse giant fluid ecosystems that survived the most severe biological crisis of the past 540 million years. In a new study, paleontologists have investigated plant and tetrapod fossils and various microfossils in the Permian-Triassic Nantaodonggou section in Xinjiang, China. Their fossil records reveal the presence of gymnasium forests and fern fields in a vibrant area, but marine life has experienced mass extinction.

Artistic reconstruction of the end of Permian mass extinctions based on fossil parinomorphs, plants, and tetrapods, and the end of Permian mass extinctions based on sedimentary data from the Southern Jiang section of China's New Jiang. Image credit: DH Yang.

The mass extinction of Permian, which occurred about 252 million years ago, is widely recognized as the most serious of the five major plant zoic extinctions.

This catastrophic event leads to the extinction of about 80% of known species and is a fact that is well supported by marine fossil records.

Some scientists suggest that volcanic eruptions in Siberia caused widespread terrestrial destruction through wildfires, acid rain and toxic gases.

This evidence includes the continuous extinction of properties. Gigantopteris Flora in southern China Grosso Pteris Flora crossing Gondwanaland around the mass extinction of the Endopermians.

However, other scientists argue that these devastating effects are limited by latitude and atmospheric circulation.

Several fossil discoveries suggest that certain Mesozoic plants exist before extinction events, referring to uninterrupted evolution.

Newly discovered fossils from the southern taodonggou section, located in the Tapan Hami Basin in Xinjiang Province, northwestern China, offer a unique perspective.

“We further confirm that the presence of intact tree trunks and fern stems represents local vegetation rather than transported remains,” said Professor Minli Wang, a researcher at the Institute of Geology and Paleontology at the Chinese Academy of Sciences.

Although some plant species have disappeared locally, researchers have found that the overall extinction rate for spores and pollen species is probably only about 21%.

This conclusion is based on the discovery of many “missing” species in the early Triassic formations elsewhere, indicating temporary migration rather than permanent extinction.

This stable vegetation base was essential for the rapid recovery of local ecosystems.

Fossil evidence shows that within just 75,000 years after the extinction ended, the region supported a diverse tetrapod, including herbivorous. lystrosaurus And carnivorous chronicers show that they can quickly return to complex food webs.

This finding contrasts with previous understanding that it took more than a million years for the ecological restoration of the Endopermians to follow the extinction.

New evidence suggests that local ecological diversity in this field has recovered more than 10 times faster than in other regions.

Scientists cited the region's stable, semi-humid climate as essential to its biological resilience. According to a Paleosol Matrix analysis, the area received consistent rainfall of approximately 1,000 mm per year during this period.

Its consistent precipitation has provided southern gu with more abundant vegetation and habitable environment than other regions following the mass extinction of Permians, providing important support for migrating migrant animals.

Despite its proximity to the volcanic activity that caused the extinction of the Endopermians, the Tarpanhami Basin provides safe shelter for terrestrial life, indicating that even seemingly dangerous places can harbor important biodiversity.

“This suggests that local climate and geographical factors create an incredible pocket of resilience and hope for conservation efforts in the face of changes in the global environment,” says Professor Feng Shui of Nanjing Geology Institute, the Chinese Academy of Sciences.

“In light of current concerns about a potential sixth large-scale extinction driven by human activity, this discovery of a “life oasis” underscores the importance of identifying and protecting such natural refsias. ”

study Published in the journal Advances in science.

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Huiping Peng et al. 2025. Refludium in the abandoned indid: Unearthing the lost flora that escaped the mass extinction of Permians. Advances in science 11 (11); doi:10.1126/sciadv.ads5614

Source: www.sci.news

The survival strategies of ancient amphibians during the Permian mass extinction elucidated by new study

Posted on March 7, 2025 by Igor Mitreski

A primitive amphibian called the Temnospondyls survived the aftermath of the end-of-permian mass extinction that occurred about 252 million years ago. University of Bristol.

Reconstruction of the Temnospondyl species Mastodon Saurus. Image credit: Mark P. Whiton, https://www.markwitton.co.uk.

The Permian mass extinction is the most severe biological crisis in the last 540 million years, eliminating more than 90% of marine species and 75% of terrestrial species.

Dr. Aamir Mehmoud, a researcher at the University of Bristol, said:

“These were predatory animals that ate fish and other prey, but were primarily water-related, just like modern amphibians such as frogs and salamanders.”

“We know that the weather was hot, especially after the extinction event. Why were these water-loving animals so successful?”

The early Triassic period was an era of repeated volcanic activity that led to global warming, motivation, reduced atmospheric oxygen, acid rain, and long stages of widespread wildfires, creating such hostile conditions that the tropics lacked animal life.

This “tropical dead zone” dramatically affected the distribution of both marine and terrestrial organisms.

Dr. Suresh Singh of the University of Bristol said:

“We measured the size and characteristics of the skull and teeth that tell us about their function.”

“To our surprise, we discovered that they weren’t much different due to the crisis,” said Dr. Armin Elssler of the University of Bristol.

“The Temnospondils exhibited the same range of body sizes as the Permian, some of them were small, insect-eating, and others were bigger.”

“These large forms included animals in long snoo trapping fish and generalist feeders covered in vast nudes.”

“However, what’s unusual is that their body size and functional diversity expanded about five million years after the crisis and then returned.”

There is evidence that due to severe global warming in the first 5 million years of the Triassic, life on land and on seas has left the tropical region to avoid fever.

“Our work shows that Temnospondil was able to cross the tropical dead zone unexpectedly,” said Professor Mike Benton of the University of Bristol.

“The fossils are known from South Africa and Australia in the south, North America, Europe, and Siberia in the north.”

“Temnospondyls must have been able to cross the tropical zones during the cool episode.”

“Their explosion of success in the early Triassic period was not tracked,” Dr. Amir said.

“They dealt with hot conditions, perhaps because they could eat most prey animals and perhaps because they had a low food need by hiding in sparse waters.”

“However, when dinosaurs and mammalian ancestors began to diversify in the mid-Triassic period, Temnospondil began to undergo a long decline.”

a paper The findings will be published in the journal Royal Society Open Science.

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Aamir Mehmoud et al. 2025. Permian – the ecology and geography of the recovery of Temnospondil after the mass extinction of the Triassic period. Royal Society Open Sciencein press; doi: 10.1098/rsos.241200

Source: www.sci.news

From Star Wars to Blade Runner: BAFTA nominated soundtrack for The Creation of Mass Effect 2 | Games

Posted on February 14, 2025 by Igor Mitreski

mThe butt effect is some of the best science fiction ever made. That might sound like an epic comment, but it's true. As a trilogy, original games from 2007 to 2013 are easy to pick the most brain ideas from the sci-fi genre and invested them into memorable military role-playing games that have been the first to the controversial end. I slotted it.

Whether you prefer Asimov's hopeful optimistic outlook, Shelley's dark and reflective commentary, Star Trek's accessible thought experiment, or BattleStar Galactica's arch melodrama, Mass Effect is it I have everything. The trilogy grazes Star Wars West-inspired ratios as happily as Iain M Banks' “hard” sci-fi, bringing all its moods and micro-story into a galaxy that is captivating and believable Melding, walking in one way or another breathtaking optimism, and a choking smile.

Mass effects are special. And, like a successful video game series, franchise achievement rests on the shoulders of the developers' vast assemblies. Bioware project director Casey Hudson and studio co-founders Ray Muzyka and Greg Zeschuk have earned plenty of credits, but much of their souls comes from other creatives at Bioware. Written by Drew Calpisin, Derek Watts's Art Direction, Lead Designer Preston Wattmaniuk's vision, and Jack Wall's rising film music.

Every time you play, you can feel the choking inevitability of closed sacrifices around you. I needed music to match

“I made the Jade Empire soundtrack very successful in BioWare before Mass Effect,” Wall tells me that he asks how he became part of the team working on the original title. “Then they put out an audition process for what the team called SFX, the codename for Mass Effect. It was a blind audition, and Bioware got files back from many composers. The team was , I listened to all these different things and decided who nailed it the most. And I won that audition blind.”

Soon, Casey Hudson began working on giving an overview to the wall. “His mission was, 'I want this to sound like '80s science fiction music'. There is no Star Wars. There's nothing like the Tangerine Dream, Vangelis, or Blade Runner. Those were the main ideas. “Hudson specifically guides vintage analog synth sounds (particularly in films) that defined science fiction of the era, and wants to imagine a multi-layered multi-removal approach from the Tangerine Dream as the perfect accompaniment to a dense, complex mass-effect universe. I was thinking that.

https://www.youtube-nocookie.com/embed/lx9sPQpjgjU?wmode=opaque&feature=oembed" title="Mass Effect 2 Launch Trailer" height="480" width="854" allowfullscreen="

Wall explains that Bioware played music written by another composer called Sam Hulick. Although Hulick was not chosen as a lead composer (as he was considered too junior for his job), Wall gave him equal credibility on the soundtrack.

Up until Mass Effect 2, music really became itself and essential to the whole experience. If Mass Effect has this almost utopian outlook, then the sequel is dark if mid-20th century science fiction optimism was established to establish the universe. The end of everything is nearing. From the off point, the final act is a “suicide mission” and it is said that the problem should be sorted out before reaching the return point. There is extensive pessimism, and with each moment you play, you can feel the choking inevitability of closed sacrifices around you. I needed music to match.

“At the beginning of development, Casey Hudson came in and said, 'I want to write the ending now,'” Wall says. I want it to be the main moment everyone remembers. He gave me some guidance and told me through what he wanted. [players] Feeling – This is always the best way to work with the supervisor. ”

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“The team will decide who nailed it the most”… Jack Wall.

This track may be the aptly named Suicide Mission, which may be the most important part of the entire trilogy. It has an orchestral bias more than anything in the first game and reflects a serious overall tone. It shows how quickly they mature from one game to the next.

“It had to be epic, it had to feel like a movie, it had to feel 'one guy against everything',” Wall says. “You had to feel like you were saving the world and saving the galaxy. I came up with that main theme. [Hudson] I liked it right away. ”

However, before Wall and Hudson began installing the pieces together there was maintenance to do. Bioware and Wall were not impressed by how the music from the first game was patched to the final product. “The transition was awful,” Wall says, asking for an example.

“So, what we decided is that in Mass Effect 2, we'll do all the implementations we've never done before,” he continues. “I had an amazing assistant called Brian Didomenico who worked with me in my studio every day. He sat in my vocal booth with a desk and a PC. I told him I was my track. Sent, he implemented them into the game and did playtests there. And we tweak it until it really gets better… Bioware puts out the game when it's ready Things were delayed a lot because they were known for it, but the fans were very happy when they got it.”

Wall remembers finishing the game. It's noted that the entire ending sequence passed “in a tiny little video spitted out by the game engine.” He took the files and fed them to his Mac's film editor, stitched together the endings and edited the suicide mission. He then wrote various endings on the track, reflecting the player's choices.

“The end of everything is near”…Mass Effect 2. Photo: EA

“It was the biggest heart that I've ever done in my life,” he laughs. “And no one walked me around because they were surprised when they were about to finish the game. I handed it over and they had a lot of massages at their end to make it work. It had to, but they did it…and the result is one of the best ending sequences of the game I've ever played. It was worth the effort.”

Wall didn't return to the score for Mass Effect 3, the most popular game in the trilogy. “Casey wasn't particularly pleased with me at the end,” he says. “But I'm very proud of that score. It was nominated for BAFTA and it really worked… [even if] It didn't go as well as Casey had hoped. “Talk to the wall, I feel a near-Fleetwood Mac level creative tension between him and Hudson. The duo have created something amazing that will live forever in the minds of sci-fi and RPG enthusiasts, but at the expense of some relationships.

“That kind of fallout is just part of the transaction,” he says. “It's one of the few things in my career and it was a tough time, but that's it.”

You can survive the final mission in Mass Effect 2. Make all the right choices and execute your plans with absolute clarity and determination, and you can save all your crew as your hero and all your crew stare at a particular death. But, at least for most players, a much more likely outcome is losing at least one member of the team. This bundle of ragtags of heroes splits, gets injured, loses morale and sets foot into the climax of a series that is hopeless. For me, it reflects the brutal reality that good science fiction reveals.

Source: www.theguardian.com

Study finds new weight loss drug decreases appetite without compromising muscle mass

Posted on November 14, 2024 by Igor Mitreski

Researchers have identified a new drug similar to Ozempic that aids in weight loss without causing muscle loss. This drug, known as NK2R, works by suppressing appetite and boosting calorie burning. According to scientists, it has been successful in promoting weight loss while avoiding negative side effects such as nausea. The team of 47 researchers believe that NK2R could be a valuable option for individuals who have not seen results with other weight loss treatments.

Associate Professor Zach Gerhart-Hines, a metabolic researcher at the University of Copenhagen and co-author of the study, noted that their drug, unlike Ozempic, did not trigger nausea and also resulted in muscle relief rather than muscle loss. The drug targets specific neural circuits in the brain and affects blood sugar, weight, and cholesterol levels.

While Ozempic mimics the hormone GLP-1 to reduce hunger, NK2R works differently by targeting a molecule naturally present in the body’s cells called NK2R. When tested on overweight mice, the drug led to weight loss and decreased food intake.

However, some health experts are cautious about the effects of this treatment on humans, as it is currently based on animal studies. Dr. Adam Collins, an associate professor of nutrition at the University of Surrey, expressed skepticism about the research’s applicability to humans.

Clinical trials of NK2R in humans are scheduled to begin within the next two years.

About our experts:

Dr. Zach Gerhart-Hines is an associate professor at the University of Copenhagen, Denmark, focusing on diet, circadian clocks, and metabolism.

Dr. Adam Collins is an Associate Professor at the University of Surrey with expertise in weight loss, metabolism, and nutrition.

read more:

Source: www.sciencefocus.com

Fresh research illuminates the mechanisms behind the end-Triassic mass extinction

Posted on October 29, 2024 by Igor Mitreski

The end-Triassic extinction is, along with the end-Permian and end-Cretaceous events, the most severe mass extinctions of the past 270 million years. The exact mechanism of the end-Triassic extinction has long been debated, most notably because the carbon dioxide that had accumulated over thousands of years and appeared on the surface from volcanic eruptions was a persistent This caused temperatures to rise to impossible levels and seawater to become more acidic. but, new paper in Proceedings of the National Academy of Sciences I say the opposite. The main cause is not warmth, but cold.

Outcrop areas of Pangea's CAMP rocks are located at the time of CAMP (201 million year ago). and the Central High Atlas (CHA) Basin of Morocco. Image credit: Kent others., doi: 10.1073/pnas.2415486121.

The end-Triassic mass extinction occurred 201,564,000 years ago, resulting in the extinction of approximately 76% of all marine and terrestrial species.

This mass extinction coincided with a massive volcanic eruption that split the supercontinent Pangea.

millions of kilometers³ Over 600,000 years, lava erupted and separated what is now the Americas, Europe, and North Africa.

This event marked the end of the Triassic period and the beginning of the Jurassic period. The Jurassic period was the period when dinosaurs appeared to replace the Triassic period creatures and dominated the Earth.

A new study provides evidence that the first lava pulses that ended the Triassic period were extraordinary events that each lasted less than a century, rather than hundreds of thousands of years.

During this condensed time frame, sunlight-reflecting sulfate particles spewed into the atmosphere, cooling the Earth and freezing many of its inhabitants.

A gradual rise in temperature in an already hot environment (carbon dioxide in the atmosphere during the Late Triassic was already three times higher than today's levels) may have finished the job later, but it caused the most damage. It was a volcanic winter.

“Carbon dioxide and sulfate not only act in opposite ways, but in opposite time frames,” said Dr. Dennis Kent, a researcher at the Lamont-Doherty Earth Observatory.

“While it takes a long time for carbon dioxide to build up and heat up objects, the effects of sulfates are almost instantaneous. It takes us into the realm of human grasp. These The events happened in a lifetime.”

The Triassic-Jurassic extinction has long been thought to be related to so-called atmospheric eruptions. mid-atlantic magma zone (camp).

In their study, Dr. Kent and colleagues correlated data from CAMP deposits in the mountains of Morocco, along the Bay of Fundy in Nova Scotia, and in New Jersey's Newark Basin.

A key piece of evidence is the arrangement of magnetic particles in rocks that record the past drift of Earth's magnetic poles during eruptions.

Through a complex series of processes, this pole is offset from the planet's fixed axis of rotation, or true north, and its position changes by a tenth of a degree each year.

Because of this phenomenon, magnetic particles in lava that are placed within decades of each other all point in the same direction, but those placed, say, thousands of years later, point in different directions by 20 or 30 degrees.

What the researchers discovered were five consecutive early CAMP lava pulses spread over about 40,000 years. Each magnetic grain is aligned in a single direction, indicating that the lava pulse appeared less than 100 years before magnetic drift appeared.

These large eruptions released so much sulfate so quickly that it blocked most of the sun and lowered temperatures.

Unlike carbon dioxide, which lingers for centuries, volcanic sulfate aerosols tend to rain out of the atmosphere within a few years, so the resulting cold snaps don't last very long.

However, due to the speed and scale of the eruptions, these volcanoes' winters were devastating.

Scientists compared the CAMP series to sulfates produced in the 1783 eruption of Iceland's Laki volcano, which caused widespread crop failure. Only the first CAMP pulse was several hundred times larger.

Triassic fossils lie in the sediments just below the CAMP layer. This includes large terrestrial and semi-aquatic relatives of crocodiles, strange tree lizards, giant flat-headed amphibians, and many tropical plants. After that, it disappears with the eruption of CAMP.

Small feathered dinosaurs existed for tens of millions of years before this, surviving along with turtles, true lizards, and mammals, and eventually thriving to become much larger. This is probably because they are small and able to survive in burrows.

“The magnitude of the environmental impact is related to the concentration of events,” said Dr. Paul Olsen, also of the Lamont-Doherty Earth Observatory.

“A small event spread over tens of thousands of years has a much smaller impact than the same amount of volcanic activity concentrated over less than a century.”

“The most important implication is that CAMP's lava represents an unusually concentrated event.”

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Dennis V. Kent others. 2024. Correlation of sub-centennial-scale pulses of early mid-Atlantic magmatic field lavas and the end-Triassic extinction. PNAS 121 (46): e2415486121;doi: 10.1073/pnas.2415486121

Source: www.sci.news

The Permian mass extinction could have been influenced by the Mega El Niño event

Posted on September 12, 2024 by Igor Mitreski

Diagram of the end-Permian extinction event, where extreme temperatures may have caused forests to die off.

Richard Jones/Science Photo Library

The end-Permian extinction, 250 million years ago, may have been amplified by an El Niño event that was much stronger and longer-lasting than anything we see today.

These giant El Niño events caused extreme changes in the climate, wiping out forests and many land animals. Alexander Farnsworth At the University of Bristol, UK.

The El Niño also set off a feedback process that helped make this mass extinction so bad, he said: “There's a knock-on effect that's making these kinds of El Niños stronger and lasting longer.”

The end-Permian extinction is thought to have wiped out about 90 percent of all species living at the time, making it the worst mass extinction in history, and is widely thought to have been caused by a massive volcanic eruption in what is now Siberia.

These eruptions heated rocks rich in fossil carbon, releasing huge amounts of carbon dioxide, causing extreme global warming. Oceans became stagnant and oxygen-depleted, killing marine life.

But this doesn't explain the whole story: in particular, terrestrial species began to go extinct tens of thousands of years earlier than marine species.

A variety of ideas have been proposed to explain this, from volcanic winters to a disappearing ozone layer, but the idea that an extreme El Niño might be involved arose from studies of past ocean temperatures based on oxygen isotopes in fossils. Yadong Sun At China University of Geosciences in Wuhan.

Now, Farnsworth and his colleagues have run computer models to explore what might have happened at the end of the Permian period that could explain Sun's findings.

Currently, El Niño occurs when warm water in the western Pacific Ocean spreads eastward across the ocean surface, creating an area of anomalously warm water that heats the atmosphere and affects weather across the globe.

The researchers found that before the Permian extinction began, El Niño events were probably similar in strength and duration to today, meaning abnormally warm waters were about 0.5°C (0.9°F) hotter than average and the event lasted for several months.

But these events occurred in a huge ocean called the Panthalassa, which was 30 percent larger at the equator than the present-day Pacific Ocean. This means that the area of unusually warm water during El Niño was much larger than it is today, and its impact on the planet was much greater.

According to the team's model, rising carbon dioxide levels at the end of the Permian period caused El Niño events to become stronger and last longer. These events caused extreme weather changes on land and killed forests, which stopped absorbing carbon dioxide and started releasing it, leading to further warming and more extreme El Niño events.

In the ocean, the temperature changes would have been less drastic, and marine life would have had an easier time migrating to avoid them. This is why the marine extinctions occurred after more intense global warming. “The deadly extreme global warming that caused the marine extinctions was made worse by these El Niños because they stripped away carbon sinks,” says Farnsworth.

At the peak of the extinctions, El Niño temperature anomalies reached up to 4°C (7.2°F), and each event lasted for more than a decade, he says.

It's unclear whether a similar event will occur in the future — computer models vary in their predictions about how El Niño will change as the planet warms, Farnsworth said — but because El Niño occurs in a warmer world, it's already having big effects.

“The recent El Niño event has caused record temperatures and sparked a lot of wildfires,” he says, “and what worries me most is the signs of tree death in the Amazon during this El Niño event.”

Research shows that under certain climate conditions, El Niño could cause extinctions, Pedro Dinezio According to a team of researchers from the University of Colorado Boulder, such giant El Niño events don't occur today because the Pacific Ocean is smaller than the Panthalassa.

“These results are really interesting for understanding the past, rather than the near future,” Dinezio says. “To understand what El Niño will bring, we need to look at past periods when the continents were positioned similarly to the present.”

“I think this is a compelling study.” Phil Jardine Researchers at the University of Münster in Germany have discovered the first direct evidence that the ozone layer disappeared during the Permian mass extinction.

“I don't think this event and other extinction drivers, including ozone depletion, are mutually exclusive,” he says. “The scary thing about the end-Permian extinction is that a lot of things were happening at the same time, and they seemed to feed off each other in cascading ways throughout the Earth system.”

topic:

Source: www.newscientist.com

Using lasers to transform electrons into mass and charge coils.

Posted on July 11, 2024 by Igor Mitreski

A special laser (red) can bend electrons (blue) into a spiral shape

Dr. Yiqi Fan (University of Konstanz)

With the help of a laser, the electrons were transformed into spiral waves of mass and charge.

“Chirality, or handedness, is an intriguing and still partially mysterious feature of our universe.” Peter Baum Researchers at the University of Konstanz in Germany have discovered that chiral objects, like coils or L-shaped blocks, can be either left- or right-handed, but non-chiral objects, like circles or lines, cannot. Many molecules and materials are inherently chiral, and their function changes depending on whether they are right- or left-handed. But Baum and his colleagues have devised a way to impart chirality to something very small and fundamental: a single electron.

Because electrons are quantum objects, they exhibit both particle-like and wave-like behavior, depending on the experiment. In this experiment, the researchers exploited the wave nature of electrons. First, they create a very fast pulse of electrons and pass it through a thin ceramic membrane. There, the particles encounter a special laser beam. The beam is shaped like a light vortex and, as a result, carries a similarly shaped electromagnetic field. This electromagnetic field affects the wave function, or wave properties, of each electron that passes through it.

Finally, the researchers detected these manipulated electrons and calculated the “expectation values” of each of their masses and charges — that is, the places in space where both properties are most likely to be measured in non-zero quantities. These regions of space formed the shape of a three-dimensional coil, with clearly marked left- or right-handed winding.

Ben McMorran The University of Oregon researchers have previously experimented with making coils of chiral electrons, and they say their new work “represents a very advanced advancement in the state of the art of shaping electrons.” They have demonstrated precise control over the spiraling electrons, which they say will be crucial for using the particles in applications such as imaging and controlling existing materials.

Baum and his colleagues have already found that shining a left-handed coil of electrons at right-handed gold nanostructures results in different ricochet patterns than shining it on left-handed structures, opening up the possibility of using such coils to selectively affect chiral moieties in chemical compounds or electronic devices.

Having created these strange electrons in the lab, Baum says he's now interested in whether they could arise independently in nature: “We're starting to explore these possibilities.”

topic:

Source: www.newscientist.com

Possible Replacement for Beef: A Gelatinous Meat Mass

Posted on July 9, 2024 by Igor Mitreski

Recent advancements in cultured meat technology are poised to enhance the flavor profile of cultured meat products, making them more akin to traditional meat in taste.

Scientists have devised a “flavor-switchable scaffold” that releases meat flavor compounds when exposed to cooking temperatures.

Professor Jin-Kee Hong, a co-author of a study published in 2011 in Nature Communications, emphasized the significance of this innovation. Speaking to BBC Science Focus, he stated, “Many researchers are focusing on creating various bioscaffolds to produce 3D cultured meat from livestock cells.”

However, Hong highlighted that the current emphasis has been primarily on biological aspects, neglecting consumer preferences such as flavor, texture, and taste. He stressed, “…techniques to manipulate the sensory characteristics of cultured tissues are essential for their recognition as food.”

The new gelatin-based scaffold contains flavor compounds that break down during cooking, releasing a meaty flavor similar to traditional meats.

Chemical analysis, including testing with an electronic nose (e-nose), demonstrated that the new flavor profile of cultured meat closely resembles that of grilled beef.

According to the study’s lead author, Miley Lee, the cultured meat exhibits a meat-like flavor and texture, albeit not identical to conventional meat. Lee expressed optimism about narrowing this flavor gap through the development of bioscaffolds with more meat-like properties in the future.

Cells are cultured on a flavor-changing scaffold to produce meaty-flavored cultured meat. – Image courtesy of Yonsei University

Cultured meat is increasingly viewed as a sustainable alternative to traditional animal protein, offering consumers a beloved food while significantly reducing environmental impact and ethical issues associated with animal slaughter, as per Hong.

Moreover, customizing cultured meat to meet specific consumer preferences could position it as a healthier food choice in the future. Lee pointed out that, given its lab-grown nature, all properties of cultured meat can be tailored to meet consumer needs, such as high protein content and no fat.

Despite these breakthroughs, researchers acknowledge current limitations and the need for further exploration. “While many are developing scaffolds for cultured meat production, there is still a long road ahead to achieve meat that perfectly mimics traditional options,” Hong remarked.

Lee added that scaling up cultured meat production for cost-effectiveness and commercial viability remains a challenge, with costs still prohibitive for widespread availability.

Nonetheless, the team remains hopeful in finding solutions in the future. Lee expressed optimism, stating, “We believe our efforts can make a substantial contribution to cultured meat development and the global community.”

About our experts

Jinkee Hong, a Professor in the Department of Chemical and Biomolecular Engineering at Yonsei University, heads the Nanocomposite Materials Institute, focusing on cutting-edge research in functional polymers.

Miley Lee, a student in the integrated Masters and PhD program at Yonsei University, specializes in scaffold engineering, drug delivery for cell stimulation, and bioelectrical stimulation. She has contributed to numerous research papers in prestigious journals and holds the first authorship on several.

Read more:

Source: www.sciencefocus.com

What was the speed of life’s recovery from the end-Permian mass extinction?

Posted on June 17, 2024 by Igor Mitreski

Think back to the last time you put together a puzzle. How long did it take you to connect the first piece? Did you aim for the edge pieces, or did you look for random pairs? Now imagine that the puzzle pieces are fossils of marine creatures that lived in ancient oceans. How would you put the pieces together? Which animals appeared first, and how long did they live for? This is the “puzzle” paleontologists face when studying the fossil record.

Researchers studying the fossil record have found that a mass extinction occurred at the end of the Permian Period 250 million years ago, leaving the oceans largely empty. They propose that the Earth's higher temperatures and changes in water chemistry killed 80% of marine life, ending the Paleozoic Era. Sometime later, during the Triassic Period, marine communities were reorganized to include a diversity of organisms similar to those found in today's oceans. As such, scientists believe that Triassic marine life is a precursor to modern marine ecosystems.

Paleontologists initially thought that marine animals recovered slowly from this extinction, because complex fossil ecosystems were only discovered 10 million years later. More recently, researchers have found diverse marine animal fossils just 3 million years after this mass extinction. However, these studies leave a gap of 3 million years between the mass extinction and the appearance of modern-like marine life in the earliest Triassic period.

An international team of researchers hypothesized that a collection of fossils in southern China called the Guiyang Biota could help fill in this gap: These ancient animals were covered in deep-sea sand, forming a layer of exceptionally well-preserved fossils, LagerstätteLagerstätten often form in calm undersea environments that can preserve delicate animal parts like bones and scales. Based on their location and their position within the rocks, the team proposed that the Guiyang fossils date to the Early Triassic period.

The scientists explained that the fossils at the site included animals across all five levels of the food chain, including 10 species of bony fish, two species of shrimp, lobsters, sponges, eels, and plankton. They found that fish ate lobsters, which ate clams, which ate plankton, which ate algae, which provided energy, forming a complete modern-day marine community. The scientists suggested that these fossils may be younger than the oldest diverse fossil ecosystem scientists have ever unearthed from the Early Triassic Period.

The researchers used three methods to determine the age of the Guiyang fossils: First, they looked at the eel-like creature's teeth. ConodontsThey only lived during certain periods in Earth's history, and the researchers found that conodont teeth from the southern China fossils belonged to Triassic conodonts, supporting their original dating estimates.

Second, the researchers measured chemical signals. Carbon isotopesfound in the rock walls surrounding the fossils. Scientists have measured carbon isotopes in rocks throughout Earth's history. By matching the increases and decreases in carbon isotopes in rocks to patterns of carbon isotopes from different periods in the rock record, researchers can estimate the age of the rocks. They found that the carbon isotopes in the Guiyang rocks matched the patterns of carbon isotopes in rocks from the Early Triassic Period, further supporting the Triassic age of the fossils.

Finally, the researchers needed to establish a precise age for the Guiyang rocks to determine how rapidly the fossil assemblage developed after the mass extinction event. They used a dating method based on the radioactive decay of uranium into lead. U-Pb datingIt is found in minerals extracted from two volcanic ash layers in the rock wall.

The team explained that these ash layers were located just below and just above the fossil layers in the rocks, meaning they fell just before and just after the fossils formed. U-Pb dating determined that the fossils were between 250.79 and 250.92 million years old. The team interpreted these dates as indicating that the marine creatures lived only 10,000 to 1 million years after their extinction 250 million years ago.

From the Triassic Lagerstätte fossils, the researchers concluded that marine ecosystems recovered quickly from the end-Permian extinction, re-establishing complete food chains within one million years of the mass extinction. The researchers propose that this diverse group of organisms thrived during a cold period in the warming Triassic environment. The researchers suggest that future researchers should examine whether a short period of cool weather allowed these organisms to survive the heat, or whether other factors, such as favorable ocean chemistry, were involved.

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Source: sciworthy.com

NOAA Declares Fourth Mass Bleaching Event Imminent for World’s Coral Reefs

Posted on April 16, 2024 by Igor Mitreski

Invertebrates are highly sensitive to heat stress, so coral health is closely linked to seawater temperature. Corals turn whitish when stressed. release symbiotic algae They live in organizations. Bleaching indicates that the health of the coral is at risk.

“When a coral bleaches, it doesn’t mean it’s dead. It means it’s weak and at risk of dying if conditions don’t improve,” says Ana Palacio, a scientific assistant at the Oceanic and Atmospheric Research Institute Collaborative Research Institute based at the University of Miami in partnership with NOAA.

Corals are important ecosystems that support a wide variety of fish and aquatic species, helping to nourish coastal communities and attract tourists. The economic value of coral reefs is estimated at $2.7 trillion annually. According to the 2020 report of the Global Coral Reef Monitoring Network.

“They protect our coastlines. They protect us from storms and hurricanes. They have great value to our economy and security,” said Palacio.

Coral ecosystems are among the ecosystems that scientists believe are most at risk from global warming. In 2018, the United Nations Intergovernmental Panel on Climate Change estimated that: 70% to 90% of the world’s coral reefs They will disappear if the average global temperature drops. exceeded the threshold of 1.5 degrees Celsius above the pre-industrial average.

Last year was the hottest year on record on Earth. The average global temperature has approached that threshold for the first time, but scientists believe 2023 was an anomaly, driven by El Niño.

Experts say bleaching began early in the season as sea surface temperatures soared in Florida.

“Typically, bleaching is observed around August to September in the Northern Hemisphere. We started observing the bleaching phenomenon in July last year,” said marine biologist Fanol Montoya Maya from the Coral Restoration Foundation, an organization that collects, restores, and replants coral.

Palacio said the area has seen widespread mortality of elkhorn and staghorn corals, two species that are the focus of restoration efforts.

“In some places, about 20 percent of those populations survived,” Palacio said of the restored corals. “We’re focusing our hopes on why those corals survived and what they can tell us about resistance, and how corals can become more resilient.”

The last global coral bleaching event occurred in 2014 and lasted until 2017. More than 56% of the world’s coral reef areas experienced temperatures that could cause bleaching during that period.

Bleached coral at Flower Garden Banks National Marine Sanctuary off the coast of Galveston, Texas, Gulf of Mexico, September 16, 2023.
LM Otero / AP

Manzello said in an email Monday that 54% of the world’s coral reef areas have experienced bleaching-level heat stress in the past year, and this event could be the worst bleaching event on record.

“The proportion of coral reef areas experiencing bleaching-level heat stress is increasing by about 1% every week,” Manzello said. “This event is likely to exceed the previous peak.”

Montoya-Maya said bleaching warnings were already issued in Florida earlier than last year. He said the Coral Restoration Foundation is preparing for a busy summer in response to new bleaching events.

The natural pattern of El Niño is beginning to disappear, and NOAA’s Climate Prediction Center estimates that an El Niño event is possible. There is a 60% chance of a La Niña event occurring this summer.This could cool the waters of the Atlantic Ocean and allow some corals to recover, at least temporarily.

“This is very heartbreaking and will cause damage to many coral reefs around the world,” Palacio said. “I hope this bleaching event creates some traction and people start to care more and pay attention to what’s happening to the climate.”

Source: www.nbcnews.com

Salmon farms are experiencing a growing problem of mass mortality

Posted on March 8, 2024 by Igor Mitreski

Salmon die from algae bloom at Norwegian farm

Berit Roald/EPA-EFE/Shutterstock

Since 2012, mass die-offs of farmed salmon have become more frequent and increasing in number, with some locations wiping out millions of fish at a time. These mass mortality events are often caused by stress factors such as fluctuations in ocean temperatures and poor living conditions, highlighting the need to improve animal welfare practices on salmon farms.

Approximately 70% of the salmon sold worldwide is farmed. There is a high mortality rate of fish before they are ready for slaughter, and there are serious concerns about the environmental impact of salmon farming and the welfare of farmed fish.

Six countries produce 92% of the world's farmed salmon: Norway, Canada, the United Kingdom, Chile, Australia, and New Zealand. Gerald Singh Researchers from the University of Victoria in Canada analyzed mortality data from these countries.

The researchers found that high-fatality events increased over time, particularly in Norway, Canada, and the United Kingdom, from 2012 to 2022. A total of 865 million salmon died during this period.

“We are talking about very large numbers,” Singh says. “In the case of Norway, the worst ranged from about 935,000 fish lost in a month to just under 5 million. In Canada, the worst 10 per cent disaster ranged from about 935,000 fish lost in a month to just under 5 million. Between 10,000 and 3.8 million fish were lost.”

If this trend continues, researchers predict that future fatal crashes could cause up to 5.14 million deaths in Norway, 5.05 million people in Canada and just over 1 million people in the UK.

Environmental stressors such as marine heatwaves and lack of oxygen in the water, as well as sea lice infestations, can trigger these mass die-offs. To reduce the impact of these stressors on salmon, Singh says better animal welfare practices need to be implemented, such as not overcrowding fish pens.

“These events can have significant impacts on local economies, communities and ecosystems,” he says. “For example, if communities that rely on these industries are stripped of their farming permits, this can have a significant impact on local economies and livelihoods.”

topic:

Source: www.newscientist.com

New study reveals hundreds of thousands of young stars in Sagittarius C region with solar mass

Posted on February 13, 2024 by Igor Mitreski

Sagittarius C is located just 300 light-years from Sagittarius A*, the supermassive black hole at the center of the Milky Way.

This image of the Sagittarius C region from ESO's Very Large Telescope includes hundreds of thousands of stars. Image credit: ESO/F. Nogueras-Lara.

The center of the Milky Way is the most prolific star-forming region in the entire galaxy.

But astronomers have discovered only a fraction of the young stars they had expected. There is “fossil” evidence that many more stars than we actually see were born recently.

This is because heading to the center of the Milky Way is not an easy task. Clouds of dust and gas block the light from the star, obscuring visibility.

“On average by volume, the galactic center stands out as the most prolific star-forming environment in the galaxy,” said ESO astronomer Francisco Nogueras Lara.

“Over the past 30 million years, we have witnessed the formation of about 1 million stars.”

“But crowding and high extinction rates have hampered their discovery, and so far only a fraction of the young star's expected mass has been confirmed.”

By studying the stellar population of Sagittarius C, Dr. Lara aimed to detect young stars hidden in the galactic center.

In his research, he analyzed the following data: HAWK-I infrared measuring instrument ESO's Very Large Telescope.

He found that Sagittarius C is much richer in young stars than other regions of the galactic center.

“We found that Sagittarius C contains the solar mass of hundreds of thousands of young stars,” Dr. Lara said.

“We compared our results to a recently discovered population of young stars in Sagittarius B1, located at the opposite end of the nuclear star disk.”

“The young stars in Sagittarius C are estimated to be about 20 million years old and likely represent the next evolutionary step for the slightly younger stars in Sagittarius B1.”

“Our discovery contributes to addressing the discrepancy between the expected number of young stars at the center of galaxies and the number of detected stars, and sheds light on their evolution in this extreme environment.”

“As a secondary result, we discovered that Sagittarius C has a population of intermediate-aged stars (approximately 50% of the mass of stars between 2 billion and 7 billion years old), which is composed of a nuclear stellar disk. It does not exist in the innermost region of the world (which is dominated by stars older than 7 billion years).

“This confirms the existence of an age gradient, driving the formation of an inside-out nuclear star disk.”

of findings appear in the diary astronomy and astrophysics.

_____

F. Nogueras-Lara other. 2024. Hunt young stars at the center of the galaxy. Solar masses of hundreds of thousands of young stars in the Sagittarius C region. A&A 681, L21; doi: 10.1051/0004-6361/202348712

Source: www.sci.news

Tesla issues mass recall of US vehicles over warning light malfunction

Posted on February 2, 2024 by Igor Mitreski

Nearly all Tesla vehicles sold in the U.S. are being recalled due to small warning lights in the instrument panel. The National Highway Traffic Safety Administration announced the recall of about 2.2 million vehicles on Friday, indicating increased scrutiny of electric vehicle manufacturers. Additionally, the agency upgraded its 2023 investigation into Tesla’s steering problems to a technical analysis, bringing it one step closer to a recall.

The update in response to the recall will enhance warnings and alerts for drivers. The document from NHTSA highlights that the font size for brake, parking, and anti-lock brake warning lights is smaller than required by federal safety standards, potentially making important safety information difficult to read and increasing the risk of a collision. The agency identified the problem during a routine safety compliance audit on January 8th. While Tesla has identified three warranty claims related to the issue, there are no reports of crashes or injuries.

The recall to fix the warning light issue will be done through a software update, affecting multiple models from 2012 to 2024. Tesla has already started releasing software updates, and owners will be notified by letter starting March 30th.

Following the announcement of the recall, Tesla’s stock fell another 2.7% in early trading on Friday, reaching its lowest level since May of last year.

In addition to the warning light issue, Tesla has faced scrutiny for its Autopilot system. Last December, NHTSA pressured Tesla to recall over 2 million vehicles for software updates and fixes related to the flawed system designed to make drivers more careful when using Autopilot. The recall was prompted by a two-year investigation into crashes involving the use of Autopilot, some of which were deadly.

Additionally, Tesla is recalling over 1.6 million electric vehicles exported to China due to problems with automatic assisted steering and door latch controls. The State Administration for Market Regulation in China announced the recall in early January, with Tesla planning to use remote upgrades to resolve the issue.

Overall, Tesla has faced challenges in addressing various safety concerns with its vehicles, including steering problems and Autopilot system issues, leading to substantial recalls and regulatory scrutiny.

Source: www.theguardian.com

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