ניווט נגישות
כתבות אחרונות מאתר 'Phys'
Phys

Southern Ocean may flip from carbon sink to carbon source under mitigation scenarios‎

Plans to limit the global temperature rise to 1.5°C above preindustrial levels depend on reaching net-zero emissions and, in many cases, actively removing carbon dioxide (CO2) from the air. While this helps limit extreme weather, sea level rise, ecosystem loss and the risk of triggering irreversible climate tipping points, a new study, published in Science Advances, finds that reducing CO2 levels may have an unexpected effect. Climate simulations used in the study suggest that the Southern Ocean around Antarctica may switch from being an important carbon sink to being a prolific source of carbon.

20:50
תפריט כתבה
Phys

Why do some salivary glands fail? Researchers point to hidden cell stress‎

For cancer patients undergoing head and neck radiation therapy, people living with Sjögren's syndrome, people with diabetes or older people, reduced saliva production and the resulting dry mouth are far more than uncomfortable. They can have major consequences for quality of life, making it difficult to eat, speak and swallow, altering taste perception, and increasing the risk of dental cavities and oral infections.

19:49
תפריט כתבה
Phys

Human embryo base editing can reach all cells but causes unpredictable genetic changes‎

A study by researchers at Columbia University Vagelos College of Physicians and Surgeons has found that new cutting-edge techniques can accurately edit genes in human embryos—giving scientists indispensable tools for understanding normal human development—but has also uncovered important risks that currently preclude the use of the techniques in the clinic.

19:19
תפריט כתבה
Phys

Sea-level rise could squeeze shorebirds out of critical coastal habitat, researchers find‎

As sea levels rise, coastal wetlands around the world are expected to shrink—and researchers at the University of British Columbia have found this could put the world's shorebirds and their critical habitat at risk.

18:18
תפריט כתבה
Phys

Physicists turn classical light into a quantum machine for information processing‎

Quantum computers promise to tackle problems that are extraordinarily difficult for today's computers. But there is a major obstacle: quantum systems are notoriously fragile. Noise, loss and even tiny disturbances can destroy the delicate behavior that gives them their power. Building systems with many quantum particles is also extremely challenging.

17:17
תפריט כתבה
Phys

Tiny cyanobacteria may be the secret heroes of ocean carbon sequestration‎

A process known as the biological carbon pump (BCP) moves organic carbon from near the ocean's surface to the ocean floor. That carbon often stays there for hundreds or thousands of years, making the BCP a primary source of carbon sequestration in the oceans. Scientists have thought that relatively large phytoplankton are more efficient at exporting carbon to the deep ocean than tiny cyanobacteria, but new research by Jingjing Zhang and colleagues published in AGU Advances now calls that belief into question.

16:46
תפריט כתבה
Phys

Why are the stars around our galaxy's black hole missing their companions?‎

A new study suggests that the young stars orbiting the Milky Way's central black hole may have a surprisingly ordinary origin. But the black hole's influence may be what makes their origin look more exotic than it really is. Along with shaping their orbits, it may also destroy their stellar companions. The paper outlining this work was published in Astronomy & Astrophysics on Aug. 11.

15:44
תפריט כתבה
Phys

Rubin observatory peers deep into the famous COSMOS field‎

The COSMOS field, or Cosmic Evolution Survey Deep Field, is one of the most famous patches of the universe observed by astronomers. Located in the constellation Sextans, this region was photographed by the Hubble Space Telescope (HST) in segments from 2003 to 2005 using its Advanced Camera for Surveys (ACS). With support from ground-based and other space-based telescopes, the resulting images were then stitched together to create a stunning picture of cosmic evolution.

15:14
תפריט כתבה
דיווח על כתבה זו הסתרת כתבות מאתר זה המשך קריאה באתר המקור