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Latest National Academy of Sciences Stories

2014-02-18 13:46:43

Teenage boys who show a combination of depressive symptoms and elevated levels of the 'stress hormone' cortisol are up to fourteen times more likely to develop major depression than those who show neither trait, according to research funded by the Wellcome Trust. In a study published today in the Proceedings of the National Academy of Sciences, researchers from the University of Cambridge have identified the first biomarker – a biological signpost – for major, or clinical, depression....

2014-02-18 13:43:42

High levels of the stress hormone cortisol may contribute to the risk aversion and 'irrational pessimism' found among bankers and fund managers during financial crises, according to a new study. The study's authors say that risk takers in the financial world exhibit risk averse behavior during periods of extreme market volatility – just when a crashing market most needs them to take risks – and that this change in their appetite for risk may be "physiologically-driven", specifically by...

2014-02-07 13:15:15

A team of researchers led by Virginia Tech and University of California, Berkeley, scientists has discovered that a regulatory process that turns on photosynthesis in plants at daybreak likely developed on Earth in ancient microbes 2.5 billion years ago, long before oxygen became available. The research opens new scientific areas in the fields of evolutionary biology and microbiology. The work also has broad societal implications as it allows scientists to better understand the production...

2014-01-28 12:20:14

Drugs used to treat HIV penetrate poorly into lymphatic tissues where most HIV replication takes place and there is persistent low-level virus replication in these tissues according to research from the University of Minnesota and University of Nebraska Medical Center. The results appear in the latest issue of the Proceedings of the National Academy of Sciences (PNAS). "We know the drugs we use today are effective because our patients are doing better and living longer, but these drugs...

2014-01-21 10:24:45

For first time, PARP-1 enzyme, Sidekick-1 gene implicated in enhancing brain reward system Researchers from the Icahn School of Medicine at Mount Sinai have identified a new molecular mechanism by which cocaine alters the brain's reward circuits and causes addiction. Published online in the journal Proceedings of the National Academy of Sciences by Dr. Eric J. Nestler, MD, PhD, and colleagues, the preclinical research reveals how an abundant enzyme and synaptic gene affect a key reward...

2014-01-21 10:23:07

Study finds blowback causes extra day per year of ozone smog in LA Chinese air pollution blowing across the Pacific Ocean is often caused by the manufacturing of goods for export to the U.S. and Europe, according to findings by UC Irvine and other researchers published today in the Proceedings of the National Academy of Sciences. The study is the first to quantify how much pollution reaching the American West Coast is from the production in China of cellphones, televisions and other...

2013-12-30 23:00:54

Cold-sensitive mangrove forests have expanded dramatically along Florida’s Atlantic Coast as the frequency of killing frosts has declined, according to a new study based on 28 years of satellite data from the University of Maryland and the Smithsonian Environmental Research Center in Edgewater, Maryland. College Park, Md (PRWEB) December 30, 2013 Cold-sensitive mangrove forests have expanded dramatically along Florida’s Atlantic Coast as the frequency of killing frosts has declined,...

2013-12-17 11:04:05

Targeting the stem rather than the head of a critical protein is the challenging but promising tactic of a new study Every year the approach of flu season sets off a medical guessing game with life or death consequences. There are many different strains of flu and they vary from year to year. So each season authorities must make an educated guess and tell manufacturers which variants of the flu they should produce vaccines against. Even when this system works, flu-related illnesses can...

2013-12-17 10:56:35

Researchers included 48 middle- and high-school students in five states, from Arkansas to Maine A chemical bond discovered by Vanderbilt University scientists that is essential for animal life and which hastened the "dawn of the animal kingdom" could lead to new therapies for cancer and other diseases. The report, published online today by the Proceedings of the National Academy of Sciences(PNAS), was co-authored by 83 participants in the "Aspirnaut" K-20 STEM pipeline program for...

2013-12-10 10:29:34

A team led by a longtime Oregon Health & Science University researcher has demonstrated in mice what could be a revolutionary new technique to cure a wide range of human diseases — from cystic fibrosis to cataracts to Alzheimer's disease — that are caused by "misfolded" protein molecules. Misfolded protein molecules, caused by gene mutation, are capable of maintaining their function but are misrouted within the cell and can’t work normally, thus causing disease. The OHSU team...


Word of the Day
siliqua
  • A Roman unit of weight, 1⁄1728 of a pound.
  • A weight of four grains used in weighing gold and precious stones; a carat.
  • In anatomy, a formation suggesting a husk or pod.
  • The lowest unit in the Roman coinage, the twenty-fourth part of a solidus.
  • A coin of base silver of the Gothic and Lombard kings of Italy.
'Siliqua' comes from a Latin word meaning 'a pod.'
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