日期：2012-12-25 Some 40 million people depend on the Colorado River Basin for water but warmer weather from rising greenhouse gas levels and a growing population may signal water shortages ahead. In a new study in Nature Climate Change, climate modelers at Columbia... 阅读全文>>

日期：2012-12-25 In research published online Dec. 23, 2012 in the journal Nature Genetics, scientists have found three new and relatively rare genetic variants that influence insulin production, offering new clues about the genetic factors behind diabetes. Studying... 阅读全文>>

日期：2012-12-25 Autistic-like behaviors can be partially remedied by normalizing excessive levels of protein synthesis in the brain, a team of researchers has found in a study of laboratory mice. The findings, which appear in the latest issue of Nature, provide a p... 阅读全文>>

日期：2012-12-24 A new study co-authored by the Georgia Institute of Technology indicates that clay minerals, rocks that usually form when water is present for long periods of time, cover a larger portion of Mars than previously thought. In fact, Assistant Professor... 阅读全文>>

日期：2012-12-24 In most cities, traffic growth has outpaced road capacity, leading to increased congestion（拥挤） , particularly during the morning and evening commutes. In 2007, congestion on U.S. roads was responsible for 4.2 billion hours of additional travel t... 阅读全文>>

日期：2012-12-24 The climate after the largest mass extinction so far 252 million years ago was cool, later very warm and then cool again. Thanks to the cooler temperatures, the diversity of marine fauna（动物群） ballooned, as paleontologists from the University of... 阅读全文>>

日期：2012-12-24 Galactan（半乳糖体） is a polymer of galactose（半乳糖） , a six-carbon sugar that can be readily fermented by yeast into ethanol（乙醇） and is a target of interest for researchers in advanced biofuels produced from cellulosic biomass. Now an inter... 阅读全文>>

日期：2012-12-24 In a forced game of molecular tug-of war, some strings of atoms can act like a lever（杠杆） , accelerating reactions 1000 times faster than other molecules. The discovery suggests that scientists could use these molecular levers to drive chemical a... 阅读全文>>

日期：2012-12-24 A research team led by biogeochemists at the University of California, Riverside has tested a popular hypothesis in paleo-ocean chemistry, and proved it false. The fossil record indicates that eukaryotes（真核生物） -- single-celled and multicellula... 阅读全文>>

日期：2012-12-24 Current thinking on how the Toxoplasma gondii parasite invades its host is incorrect, according to a study published today in Nature Methods describing a new technique to knock out genes. The findings could have implications for other parasites from... 阅读全文>>

日期：2012-12-24 In a discovery that raises further concerns about the future contribution of Antarctica to sea level rise, a new study finds that the western part of the ice sheet is experiencing nearly twice as much warming as previously thought. The temperature r... 阅读全文>>

日期：2012-12-20 Over the last half decade, it has become increasingly clear that the normal gastrointestinal（胃肠的） (GI) bacteria play a variety of very important roles in the biology of human and animals. Now Vic Norris of the University of Rouen, France, and c... 阅读全文>>

日期：2012-12-20 Like sheets of paper marked with perforated（穿孔的） lines, gecko（壁虎） tails have unique structural marks that help them sever their tails to make a quick getaway（起步，逃走） . Though voluntarily shedding a body part in this manner is a well-k... 阅读全文>>

日期：2012-12-20 A new mosasaur species discovered in Hungary is the first known example of this group of scaled reptiles（爬行动物） to have lived in freshwater river environments similar to modern freshwater dolphins, according to research published December 19 in... 阅读全文>>

日期：2012-12-20 Men whacked（重击） punching bags for a University of Utah study that suggests human hands evolved not only for the manual dexterity（手灵巧度） needed to use tools, play a violin or paint a work of art, but so men could make fists and fight. Compar... 阅读全文>>

日期：2012-12-20 Regardless of the cause, stress sets in motion certain automatic changes in the body that are designed to give it a quick burst of energy. The pattern of changes has been called the fight-or-flight response because it most likely evolved from our pr... 阅读全文>>

日期：2012-12-20 Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C; a departure of a few... 阅读全文>>

日期：2012-12-20 Most people are aware that outdoor air pollution can damage their health, but many do not know that indoor air pollution can also have significant health effects. Environmental Protection Agency studies indicate that indoor levels of pollutants may... 阅读全文>>

日期：2012-12-18 Researchers at the University of Wisconsin Carbone Cancer Center have discovered a new form of cell division in human cells. They believe it serves as a natural back-up mechanism during faulty cell division, preventing some cells from going down a p... 阅读全文>>

日期：2012-12-18 Just 20 years ago, the soils of the Amazon basin were thought unsuitable for large-scale agriculture, but then industrial agriculture -- and the ability to fertilize on a massive scale -- came to the Amazon. What were once the poorest soils in the w... 阅读全文>>