The Proceedings of the National Academy of Sciences of the United States of America, usually referred to as PNAS, is the official journal of the United States National Academy of Sciences (NAS). PNAS is an important scientific journal that printed its first issue in 1915 and continues to publish highly cited research reports, commentaries, reviews, perspectives, feature articles, profiles, letters to the editor, and actions of the Academy. Coverage in PNAS broadly spans the biological, physical, and social sciences. Although most of the papers published in the journal are in the biomedical sciences, PNAS recruits papers and publishes special features in the physical and social sciences and in mathematics. PNAS is published weekly in print, and daily online in PNAS Early Edition. PNAS was established by NAS in 1914, with its first issue published in 1915. The NAS itself had been founded in 1863 as a private institution, but chartered by the US Congress, with the goal to "investigate, examine, experiment, and report upon any subject of science or art." By 1914, the Academy was well established.
Sugary, shipwrecked champagne reveals history of 19th-century winemaking
A shipwrecked trove of sugary, 19th century champagne is revealing new details about centuries-old ways of making wine, and fresh insights into the people who drank it, scientists said Monday.
Decreasing biodiversity affects productivity of remaining plants
When plant biodiversity declines, the remaining plants face diminishing productivity, say scientists in study published April 20 in the journal Proceedings of the National Academy of Sciences.
Oldest fossils controversy resolved
New analysis of world-famous 3.46 billion-year-old rocks by researchers from The University of Western Australia is set to finally resolve a long-running evolutionary controversy.
Plausibility of the vibrational theory of smell
Uranium isotopes carry the fingerprint of ancient bacterial activity
The oceans and other water bodies contain billions of tons of dissolved uranium. Over the planet's history, some of this uranium was transformed into an insoluble form, causing it to precipitate and accumulate ...
Deep national history of immigration predicts wide cultural comfort displaying emotion
If your home country is historically heterogeneous and you know it, crack a smile. People who live in countries built on centuries of migration from a wide range of other countries are more emotionally expressive ...
Electron transfer challenges common fluorescence technique
Tryptophan is an amino acid, one of the building blocks of proteins. It is used extensively to study how proteins change their 3D structure, and also how they interact with other proteins and molecules. This is studied with ...
Researchers produce first atlas of airborne microbes across United States
A University of Colorado Boulder and North Carolina State University-led team has produced the first atlas of airborne microbes across the continental U.S., a feat that has implications for better understanding ...
Boron-based atomic clusters mimic rare-earth metals
New transitional stem cells discovered
Pre-eclampsia is a disease that affects 5 to 8 percent of pregnancies in America. Complications from this disease can lead to emergency cesarean sections early in pregnancies to save the lives of the infants and mothers. ...
Fish type, body size can help predict nutrient recycling rates
The nutrients excreted by fish in their "pee" may be critical to the health of coastal ecosystems. But knowing whether generalizations can be made about how to predict these nutrient levels in various ecosystems ...
Discovery of new plant switch could boost crops, biofuel production
A team of Michigan State University researchers has discovered a switch that regulates plant photosynthesis - the process that lets plants store solar energy and use it to grow and produce food.
Female reproductive tract assists swimming sperm
In mammalian reproduction, sperm have a tough task: like trout swimming upstream, they must swim against a current through a convoluted female reproductive tract in search of the unfertilized egg.
Shape-shifting molecule tricks viruses into mutating themselves to death
A newly developed spectroscopy method is helping to clarify the poorly understood molecular process by which an anti-HIV drug induces lethal mutations in the virus' genetic material. The findings from the ...