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כתבות אחרונות מאתר 'Phys'
Phys

Shell game: How oysters enlist help from microbes‎

For an oyster, creating an internal environment for calcification that forms its distinctive hard shell is essential. But new Harvard research has found that these bivalves may outsource the work, coordinating with microbes in a manner that may shed light not only on oysters but on how microbes might help with resilience in a changing ocean. The research is published in the journal Proceedings of the National Academy of Sciences.

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Phys

Galactic islands of tranquility: 'Little red dots' may have brewed life's building blocks‎

Astronomers have found that both the core of our Milky Way and the earliest proto-galaxies in the universe share a surprising trait: They are unusually calm and quiet in terms of harsh radiation. This tranquility is not just a cosmic curiosity; it may be essential for forming complex molecules that provide the ingredients of life.

22:49
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Phys

New study of global reef growth over past 12,000 years offers insights into impact of rising ocean temperatures‎

Coral reefs over the past 12,000 years grew best when the ocean temperature was 77 degrees Fahrenheit (25 degrees Celsius), according to new research from Florida Tech. Recent ocean warming and regional and local disturbances are reducing coral reefs' capacity to keep pace with rates of sea level rise. This research is important because looking into the past helps us understand how reefs may respond in the future.

22:49
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Phys

Turning penicillin into a lethal force against bacteria again‎

When many disease-causing bacteria encounter penicillin, they are not always destroyed right away, shifting into a temporary survival state called antibiotic tolerance. This state allows them to withstand drug levels that would normally eradicate them. Tolerance is not the same as full antibiotic resistance, but researchers now see it as a risky precursor towards it.

22:49
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Phys

How semiconductor electrodes can achieve green hydrogen production‎

Researchers at the University of Jyväskylä (Finland) have led an international collaboration to study how semiconductor materials enable the production of green hydrogen through (photo)electrochemistry. Novel atomic-level simulations and precise (spectro)electrochemical experiments reveal the basic mechanisms underlying the hydrogen evolution reaction on a prototypical titanium dioxide semiconductor and support the development of new materials for hydrogen production. The research also identified a previously unknown phenomenon in electrocatalysis: the application of an electrode potential can create local charge centers, polarons, which activate the hydrogen evolution reaction on the semiconductor surface.

22:49
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Phys

The bizarre sex life of mayflies: Micro-CT scans reveal ins and outs of swarm Kamasutra‎

A new study on mayflies of the genus Ecdyonurus illustrates just how multifaceted and surprising reproductive behavior in nature can be. Entomologists at the State Museum of Natural History Stuttgart (SMNS), using state-of-the-art computed tomography, have analyzed the mating rituals of these insects in detail for the first time. The results reveal surprising mechanisms of specially adapted reproductive organs that enable the mayflies' acrobatic mating flight.

22:49
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Phys

Allowing atoms to come and go can open the door to better materials modeling‎

Most materials, especially metals and ceramics, are crystals. Their atoms are arranged in three-dimensional lattices that repeat the same exact pattern, over and over again. But there's a well-known saying in materials science: "Crystals are like people. It is the defects that tend to make them interesting."

22:49
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Phys

Webb spots details in nearby spiral galaxy NGC 5134‎

Two powerful instruments of the NASA/ESA/CSA James Webb Space Telescope joined forces to create this scenic galaxy view. This spiral galaxy is named NGC 5134, and it is located 65 million light-years away in the constellation Virgo. Though 65 million light-years may seem like a huge distance—the light that Webb collected to create this image has been journeying to us from NGC 5134 since soon after Tyrannosaurus rex went extinct—NGC 5134 is fairly close by as far as galaxies go. Because of the galaxy's relative proximity, Webb can spot incredible details in its tightly wound spiral arms.

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Phys

Pollen-replacing feed strengthens honey bee colonies, long-term study confirms‎

A man-made food source provided honey bees a nutritious diet at a commercial scale over the course of two winter seasons, according to a new study led by Washington State University researchers. The study, published in the journal Insects, looked at the new feed as used by five commercial beekeepers in California and Idaho from fall 2022 to spring 2024. This study is a follow-up to an initial paper describing the bee feed.

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Phys

Satellite data suggest Sundarbans mangroves are losing resilience‎

Mangrove forests protect tropical coasts from storms, store large amounts of carbon and provide vital habitats for plants and animals, serving, for example, as nurseries for fish and crabs. They also supply local communities with wood and medicinal plant substances. But how resilient are these ecosystems to increasing environmental pressures? An international research team including the Leibniz Centre for Tropical Marine Research (ZMT) investigated the role biodiversity plays in the resilience of mangrove forests. The study, co-authored by ZMT mangrove ecologist Martin Zimmer, focuses on the Sundarbans, one of the largest contiguous mangrove ecosystems in the world.

22:49
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