ניווט נגישות
כתבות אחרונות מאתר 'Phys'
Phys

Chromosomes condense in three timed chemical waves during cell division, study shows‎

DNA does not float freely in the cell. Instead, it is wrapped around histone proteins to form structures called nucleosomes. These histones carry numerous chemical modifications that act as molecular signals, controlling how tightly the DNA is packaged and which genes are active. During cell division, this DNA-histone complex—known as chromatin—must be further condensed into compact, rod-shaped chromosomes. Histone modifications play a key role in this process: They change significantly during condensation and regulate the conversion of chromatin.

22:33
תפריט כתבה
Phys

Scientists call for integrating three energy demand goals into climate policy by 2035‎

A new article published in Science argues that governments should adopt three integrated energy demand goals by 2035, warning that climate policy will fall short unless it focuses not only on how energy is produced, but also on how it is used.

22:33
תפריט כתבה
Phys

Promising H5N1 vaccine protects dairy calves and mice against severe disease‎

Researchers at the University of Nebraska–Lincoln have developed a vaccine approach that shows promise in protecting against highly pathogenic bird flu, demonstrating strong efficacy in both mice and cattle. Avian influenza (H5N1) has disrupted agricultural systems globally, leading to the culling of more than 166 million commercial poultry birds in the United States since 2022. In 2024, the virus spread to dairy cattle—an unprecedented interspecies transfer—and subsequently caused illness in about 70 farm workers with close contact to infected animals.

22:02
תפריט כתבה
Phys

A mother's gift: Plastid-derived structures help sea urchin development and dispersal‎

During the development of marine organisms—from fertilization through to juvenile stages—it is often observed that the eggs released into the water column are initially supplied with only a small fraction of the energy they require. The remaining reserves needed for growth must be obtained from the environment through filtering food—like phytoplankton—from the water column. This strategy of providing many eggs with only a small amount of energy each often leads to the loss of almost all potential offspring.

21:49
תפריט כתבה
Phys

Genomic tool untangles how microbes spread—even when they look almost identical‎

Researchers have developed a powerful new tool that can track how microbes spread between people with unprecedented precision, offering new ways to prevent infections and improve treatments in the future. The research, published April 24 in Nature Microbiology, describes how the new tool, called TRAnsmision Clustering of Strains (TRACS), uses genomics to distinguish between closely related strains of microbes.

21:24
תפריט כתבה
Phys

Extra sets of chromosomes may help aggressive tumor cells spread, study finds‎

One of the biggest challenges in cancer research is understanding why some tumor cells become especially aggressive, invasive and resistant to treatment. Scientists have increasingly linked these dangerous traits to polyploid cancer cells—cells with extra sets of chromosomes—but exactly how those extra chromosomes help tumors spread has remained unclear.

21:05
תפריט כתבה
Phys

Inside the competition for capital at some of the world's biggest banks‎

As the U.S. economy becomes more consolidated, the strategic decisions of senior leaders at leading companies carry ever-greater weight. A lot is riding on how these companies are run, yet in most cases, their day-to-day decision-making remains obscure. But the banking industry is an exception. As Barbara Su, assistant professor of accounting at Costello College of Business at George Mason University, notes, "Because the banking industry is heavily regulated, it allows us to have access to subsidiary banks' financial information. We can observe how much money parent companies take from each subsidiary, as well as the internal capital allocation between subsidiaries by headquarters."

20:49
תפריט כתבה
Phys

Self-regulating process governs cosmic order inside star clusters‎

A team of astrophysicists from Nanjing University and University of Bonn have demonstrated that, rather than being random, the mass of new stars born inside a star cluster is actually governed by a defined process of self-regulation. Their work has been published in the journal Research in Astronomy and Astrophysics.

20:43
תפריט כתבה
Phys

Carbon nanotubes are closing the gap on copper conductivity‎

Carbon nanotubes are one technology that many observers believe hasn't quite lived up to the extreme hype that surrounded them when they first appeared on the scene in the late 1990s. At that time, much was made of their extraordinary electrical, thermal, and mechanical properties, with predictions that they would revolutionize materials science, electronics, and daily life. But could we be closer to realizing some of that promise?

20:30
תפריט כתבה
Phys

Waste biomass helps unlock hydrogen and formate in lower-energy electrolysis‎

A research team has developed a high-efficiency electrochemical system that simultaneously produces hydrogen and value-added chemicals using glycerol, a low-cost, abundant byproduct of biodiesel production. The findings are published in Joule.

20:30
תפריט כתבה
דיווח על כתבה זו הסתרת כתבות מאתר זה המשך קריאה באתר המקור