日期：2012-07-05 Brown widow spiders are relatively new to North America, where they were first documented in Florida in 1935, and even newer to southern California, where they were only recently discovered in 2003. However, in the last decade they have been so succ... 阅读全文>>

日期：2012-07-05 Swaying trees is the way to go, if you are a primate（灵长目动物） crossing the jungle. Using human street athletes as stand-ins for orangutans（猩猩） , researchers have measured the energy required to navigate a forest using different strategies a... 阅读全文>>

日期：2012-07-05 Plastic pollution off the northwest coast of North America is reaching the level of the notoriously polluted North Sea, according to a new study led by a researcher at the University of British Columbia. The study, published online in the journal Ma... 阅读全文>>

日期：2012-07-04 Toxic chemicals wreak havoc on cells, damaging DNA and other critical molecules. A new study from researchers at MIT and the University at Albany reveals how a molecular emergency-response system shifts the cell into damage-control mode and helps it... 阅读全文>>

日期：2012-07-04 In an international scientific breakthrough, a Griffith University research team has been able to photograph the shadow of a single atom for the first time. We have reached the extreme limit of microscopy（显微镜学） ; you can not see anything small... 阅读全文>>

日期：2012-07-04 The Wildlife Conservation Society (WCS) announced July 3 that the markhor（捻角山羊） -- a majestic（庄严的） wild goat species -- is making a remarkable comeback in Pakistan due to conservation efforts. WCS-led community surveys have revealed that... 阅读全文>>

日期：2012-07-04 A new species of feathered dinosaur discovered in southern Germany is further changing the perception of how predatory（食肉的） dinosaurs looked. The fossil of Sciurumimus albersdoerferi, which lived about 150 million years ago, provides the first... 阅读全文>>

日期：2012-07-03 Now that the summer season is in full swing（活跃） , many of us will be hosting picnics and barbecues and socializing outside. Chances are, we'll also have some unwanted guests in the form of mosquitoes. Mosquitoes seem to have an uncanny（神秘的）... 阅读全文>>

日期：2012-07-03 Increasing the number of cups of caffeinated（含咖啡因的） coffee you drink could lower your risk of developing the most common form of skin cancer, basal cell carcinoma（基底细胞癌） , according to a study published in Cancer Research, a journal of... 阅读全文>>

日期：2012-07-03 Through an exploration of tree rings and oxygen isotopes, researchers at the University of Pittsburgh are now able to better pinpoint the history of droughts in the arid（干旱的） and semiarid areas of the American West. A paper published in the onl... 阅读全文>>

日期：2012-07-03 New research led by Patrick F. Sullivan, MD, FRANZCP, a medical geneticist at the University of North Carolina School of Medicine, points to an increased risk of autism（自闭症） spectrum disorders (ASDs) among individuals whose parents or siblings... 阅读全文>>

日期：2012-07-02 For many grocery shoppers, those perfect, red tomatoes from the store just can't match the flavor from the home garden. Now, researchers at Boyce Thompson Institute for Plant Research at Cornell University, USDA and the University of California at D... 阅读全文>>

日期：2012-07-02 If the day seems a little longer than usual on Saturday, June 30, 2012, that's because it will be. An extra second, or leap second, will be added at midnight to account for the fact that it is taking Earth longer and longer to complete one full turn... 阅读全文>>

日期：2012-07-02 Popularly dubbed the book of life, the human genome is extraordinarily difficult to read. But without full knowledge of its grammar and syntax（语法，句法） , the genome's 2.9 billion base-pairs of adenine（腺嘌呤） and thymine（胸腺嘧啶） , cytosin... 阅读全文>>

日期：2012-07-02 When people have similar injuries, why do some end up with chronic pain while others recover and are pain free? The first longitudinal brain imaging study to track participants with a new back injury has found the chronic pain is all in their heads... 阅读全文>>

日期：2012-06-28 Scientists have identified a new mechanism of bacterial pathogenesis（发病原理） . The results of the research project, partly funded by the Academy of Finland, have been published in the journal Proceedings of the National Academy of Sciences of th... 阅读全文>>

日期：2012-06-28 When it came to eating, an upright, 2 million-year-old African hominid had a diet unlike virtually all other known human ancestors, says a study led by the Max Planck Institute of Evolutionary Anthropology in Leipzig, Germany and involving the Unive... 阅读全文>>

日期：2012-06-28 In the first side-by-side tests of a half-dozen palladium（钯） - and iron-based catalysts for cleaning up the carcinogen（致癌物质） TCE, Rice University scientists have found that palladium destroys TCE far faster than iron -- up to a billion time... 阅读全文>>

日期：2012-06-28 Australopithecus sediba, believed to be an early relative of modern-day humans, enjoyed a diet of leaves, fruits, nuts, and bark, which meant they probably lived in a more wooded environment than is generally thought, a surprising find published in... 阅读全文>>

日期：2012-06-28 All recipes for chewing gum manufactured today share the same main ingredients: a gum base, sweeteners, primarily sugar and corn syrup（糖浆） , and flavorings. Some also contain softeners, such as glycerin（甘油） and vegetable oil. The amount of e... 阅读全文>>