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63 articles from PhysOrg

Earth's anthropogenic carbon dioxide increase is unprecedented

A new measurement technology developed at the University of Bern provides unique insights into the climate of the past. Previous CO2 concentrations in the atmosphere could be reconstructed more accurately than ever before, thanks to high-resolution measurements made on an Antarctic ice core. The study, which analyzed the Earth's atmospheric composition between 330,000 and 450,000 years ago, was...

NASA gets a wide-angle view of hurricane Genevieve

NASA provided a series of photos of Hurricane Genevieve as it affected Mexico's southern Baja California peninsula. An astronaut aboard the International Space Station provided wide-angle photos of Genevieve, showing the size of the storm. Warnings and watches are in effect on Aug. 20.

New approach uses wild genes to improve biological nitrogen fixation in soybeans

One of the top four crops grown worldwide, soybean has been an integral part of Chinese agriculture for a long time, having been domesticated more than 6000 years ago. During the domestication process, certain traits are selected that make plants easier to cultivate and cook and other traits can be lost. Wild ancestors of domesticated crops can be important reservoirs of agronomic traits that have...

Larger variability in sea level expected as Earth warms

A team of researchers from the University of Hawai'i (UH) at Mānoa School of Ocean and Earth Science and Technology (SOEST) identified a global tendency for future sea levels to become more variable as oceans warm this century due to increasing greenhouse gas emissions. Sea level variability alters tidal cycles and enhances the risks of coastal flooding and erosion beyond changes associated with...

No more playing with fire: Study offers insight into 'safer' rechargeable batteries

Lithium-ion batteries (LIBs) are a common type of rechargeable batteries. Their versatile nature and numerous applications in all sorts of electronic devices—from mobile phones to cars—makes them seem too good to be true. And perhaps they are: recently, there has been an increase in the number of fire-related incidents associated with LIBs, especially during charging, causing serious concerns...

A new tool to create chemical complexity from fatty acids

Hokkaido University WPI-ICReDD researchers developed a modular catalyst that can accurately modify fatty acid derivatives in a hitherto inaccessible position. This enables the efficient production of valuable compounds from a renewable bioresource, whereas before we had to either rely on petroleum-derived resources or use complicated and costly methods.

Fossil leaves show high atmospheric carbon spurred ancient 'global greening'

Scientists studying leaves from a 23-million-year-old forest have for the first time linked high levels of atmospheric carbon dioxide with increased plant growth, and the hot climate off the time. The finding adds to the understanding of how rising CO2 heats the earth, and how the dynamics of plant life could shift within decades, when CO2 levels may closely mirror those of the distant past.

Scientists reveal shifting spring phenology of Arctic tundra with satellite and ground observation

Phenology represents the seasonal dynamics of vegetation, and is an important indicator of local and regional climate change. With stronger warming trends at higher latitudes, the seasonality of vulnerable Arctic tundra is more sensitive. Many studies have reported advances in the start of growing season (SOS) in Northern Hemisphere, however, a delayed trend in SOS was reported in some recent...

Researchers take a fresh look at the Michaelis-Menten equation

Researchers from Aarhus University challenge one of the cornerstones of biochemistry, the Michaelis-Menten equation. They show that many enzymes in signaling pathways are independent of substrate concentration, because the substrate is physically connected to the enzyme. With these results, it may one day be possible to develop drugs that not only target the enzyme, but also affect how it is...