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214,919 articles from PhysOrg

Hygienic honey bees are more resistant to destructive parasite

Varroa destructor is a parasitic mite that affects honeybees. It originated in Asia, but has spread to almost every region of the world. Domestic honey bees, Apis mellifera, are particularly vulnerable to this parasite, which can cause the loss of a colony in just a few months, as well as significant economic losses for beekeepers. Although chemical treatments have existed since the 1980s, they...

How to set ambitious goals for sustainable agriculture

Food production in the Netherlands is an economic success but has led to many environmental issues, including nitrogen pollution. Recently, the policy to allow economic growth while reducing nitrogen losses was disapproved by the highest court in the Netherlands, casting the country into a nitrogen crisis. In a new article in the sustainability science journal One Earth, Jan Willem Erisman...

Why COVID-19 won't kill cities

For those of you who live in cities, ask yourself: What it is about your urban lifestyle that makes it worth it despite the pollution, the noise and the traffic? Perhaps it's the hundreds of unique restaurants that you like to dine at. Or the density that fosters a vibrant night life and cosmopolitan cultural scene. Maybe it's the parks, the museums, the tall buildings, the mass transit.


Biologists show for the first time that mosses have a mechanism to protect them against cold

A team led by plant biologists at the Universities of Freiburg and Göttingen in Germany has shown for the first time that mosses have a mechanism to protect them against cold that was previously known only in flowering plants. Professor Ralf Reski at the Cluster of Excellence Centre for Integrative Biological Signalling Studies (CIBSS) at the University of Freiburg and Professor Ivo Feussner at...

Study reveals a diverse cephalopod fauna in the canary current large marine ecosystem

An extensive review of cephalopod fauna from the Northwest African Atlantic coast was performed by researchers from the University of Vigo (Spain) and the Spanish Institute of Oceanography (IEO). The study was based on the collections gathered in 1,247 bottom trawl stations carried out during ten multidisciplinary surveys in the Canary Current Large Marine Ecosystem (CCLME).

Increasing ocean temperature threatens Greenland's ice sheet

Scientists at the University of California, Irvine and NASA's Jet Propulsion Laboratory have for the first time quantified how warming coastal waters are impacting individual glaciers in Greenland's fjords. Their work is the subject of a study published recently in Science Advances.

How complex oscillations in a quantum system simplify with time

Quantum physics allows to make statements about the behavior of a wide variety of many-particle systems at the atomic level, from salt crystals to neutron stars. In quantum systems, many parameters do not have concrete values, but are distributed over various values with certain probabilities. Often this distribution takes the form of a simple Gaussian bell curve that is encountered also in...

NASA's Roman mission will probe galaxy's core for hot Jupiters, brown dwarfs

When it launches in the mid-2020s, NASA's Nancy Grace Roman Space Telescope will explore an expansive range of infrared astrophysics topics. One eagerly anticipated survey will use a gravitational effect called microlensing to reveal thousands of worlds that are similar to the planets in our solar system. Now, a new study shows that the same survey will also unveil more extreme planets and...

The surprises of color evolution

Nature is full of color. For flowers, displaying color is primarily a means to attract pollinators. Insects use their color vision not only to locate the right flowers to feed on but also to find mates. The evolutionary interaction between insects and plants has created complex dependencies that can have surprising outcomes. Casper van der Kooi, a biologist at the University of Groningen, uses an...

Better bundled: New principle for generating X-rays

X-rays are usually difficult to direct and guide. X-ray physicists at the University of Göttingen have developed a new method with which the X-rays can be emitted more precisely in one direction. To do this, the scientists use a structure of thin layers of materials with different densities of electrons to simultaneously deflect and focus the generated beams. The results of the study were...

Dairy calves benefit from higher-protein starter feed, study says

Dairy producers know early nutrition for young calves has far-reaching impacts, both for the long-term health and productivity of the animals and for farm profitability. With the goal of increasing not just body weight but also lean tissue gain, a new University of Illinois study finds enhanced milk replacer with high crude-protein dry starter feed is the winning combination.

Spatial decoupling of light absorption and reaction sites in n-Si photocathodes for solar water splitting

Solar-driven photoelectrochemical (PEC) water splitting is an attractive approach to convert solar energy into chemical energy. Among many photoelectrode materials, crystalline silicon (c-Si) has drawn considerable attention because of its earth abundance, narrow bandgap, and suitable band edge position for hydrogen evolution reaction (HER). However, c-Si suffers from low photovoltage generated...