Earth
Climate change-induced ice melting in the Arctic has led to contradictions in the assessment of Russia's rights in the region. As ice cover diminishes, Russia may be losing its influence on the territories that it has historically developed. This is partially due to the changing width of territorial waters by low-water lines.
Climate change induced yield reductions can be compensated by cultivar adaptation and global production can even be increased.
In the midst of a devastating global pandemic of wildlife origin and with future spillovers imminent as humans continue to come into closer contact with wildlife, infectious-disease models that consider the full ecological and anthropological contexts of disease transmission are critical to the health of all life. Existing models are limited in their ability to predict disease emergence, since they rarely consider the dynamics of the hosts and ecosystems from which pandemics emerge.
A new study of ancient DNA from horse fossils found in North America and Eurasia shows that horse populations on the two continents remained connected through the Bering Land Bridge, moving back and forth and interbreeding multiple times over hundreds of thousands of years.
SAN DIEGO (May TK, 2021) - Compared to most other bear species, very little is known about how female Andean bears choose where they give birth to cubs. As a critical component of the reproductive cycle, birthing dens are essential to the survival of South America's only bear species, listed as Vulnerable on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species.
Writing in the May 14, 2021 issue of The American Journal of Psychiatry, a multi-institution team of scientists led by researchers at University of California San Diego School of Medicine report that medications commonly prescribed to reduce the severity of physical and mental health symptoms associated with schizophrenia may have a cumulative effect of worsening cognitive function in patients.
BOSTON - In the early months of the COVID-19 pandemic, the United States experienced higher rates of heart disease and cerebrovascular disease deaths, relative to the corresponding months the previous year. While a large body of evidence has shown that Black and Hispanic communities have borne a disproportionately high burden of disease and death from COVID-19, little is known about whether the rise in cardiovascular deaths during the pandemic has been disproportionately concentrated among racial and ethnic minority populations.
A decade already passed from the first use of bioresorbable vascular scaffold in percutaneous coronary interventions. The first studies - by using surrogate endpoints - showed some superiority of BRS vs. metallic drug-eluting stent in terms of the so-called vascular restoration therapy with recovery of vasomotion and vascular pulsatility when the scaffold was absorbed.
Postpartum psychosis is a devastating, but rare, mental health problem that affects women in the first few weeks after giving birth. Symptoms vary widely, and can include high mood (mania), depression, confusion, hallucinations and delusions.
Although the disorder affects only one in every 1,000 women who have a baby, it is much more common in mothers with a history of bipolar disorder or schizoaffective disorder (a condition which has symptoms of schizophrenia and bipolar disorder), or women who have suffered a previous episode of postpartum psychosis.
The first-ever discovery of an extraterrestrial radioactive isotope on Earth has scientists rethinking the origins of the elements on our planet.
The tiny traces of plutonium-244 were found in ocean crust alongside radioactive iron-60. The two isotopes are evidence of violent cosmic events in the vicinity of Earth millions of years ago.
Star explosions, or supernovae create many of the heavy elements in the periodic table, including those vital for human life, such as iron, potassium and iodine.
An international team of scientists from the Menzies Health Institute Queensland (MHIQ) at Griffith University and from City of Hope, a research and treatment center for cancer, diabetes and other life-threatening diseases in the U.S., have developed an experimental direct-acting antiviral therapy to treat COVID-19.
Traditional antivirals reduce symptoms and help people recover earlier. Examples include Tamiflu®, zanamivir and remdesivir.
Scientists have detected new early-warning signals indicating that the central-western part of the Greenland Ice Sheet may undergo a critical transition relatively soon. Because of rising temperatures, a new study by researchers from Germany and Norway shows, the destabilization of the ice sheet has begun and the process of melting may escalate already at limited warming levels. A tipping of the ice sheet would substantially increase long-term global sea level rise.
FRANKFURT. There are currently only a few synthetic agents that bind to and block the widespread membrane transport proteins, ATP-binding cassette transporters (ABC). Scientists at Goethe University and the University of Tokyo identified four of these macrocyclic peptides as models for a novel generation of active substances. They used methods for which the scientists involved are considered world leaders.
One of the projected effects of a warming climate for species living on mountain slopes is moving their distributions upslope as their habits shift upwards. Eventually, since mountains have a limit to their elevation, a species may have no more habitat to move up to and therefore go extinct. Tracking how and where this is happening is tough, though, if you don't have a good idea of where the species are now. That's the situation in places such as Africa, which have tremendous biodiversity but spotty ecological baseline data.