日期：2010-06-28 Conditions favourable to life may once have existed all over Mars. Detailed studies of minerals found inside craters（火山口） show that liquid water was widespread, not only in the southern highlands, but also beneath the northern plains. ESA's Mar... 阅读全文>>

日期：2010-06-28 Using new technology that allows scientists to monitor how individual cells react in the complex system of cell signaling, Stanford University researchers have uncovered a much larger spectrum（频谱，范围） of differences between each cell than ever... 阅读全文>>

日期：2010-06-28 When high-temperature superconductors（超导体） were first announced in the late 1980s, it was thought that they would lead to ultra-efficient magnetic（磁性的） trains and other paradigm-shifting technologies. That didn't happen. Now, a University... 阅读全文>>

日期：2010-06-27 Elevated blood levels of high-density lipoprotein ( HDL高密度脂蛋白 ) or good cholesterol（胆固醇） , typically thought to protect against heart disease, may do the opposite in women with type 1 diabetes, according to a University of Pittsburgh Grad... 阅读全文>>

日期：2010-06-27 A mechanism that regulates（调节，校准） stem- cell differentiation（细胞分化） in mice testes（睾丸） suggests a similar process that may trigger degenerative disease（变性疾病） in humans, according to a Penn State College of Agricultural Sciences... 阅读全文>>

日期：2010-06-27 Celia has exploded into a monster hurricane in the Eastern Pacific, and is now a Category 5 storm over open waters. NASA's Aqua（浅绿色） satellite captured an infrared（红外线的） image (that shows temperature) of Celia's clouds and clearly shows a... 阅读全文>>

日期：2010-06-27 US scientists reports discovery of a new mechanism of avian influenza（禽流感） virus circulation and transmission in nature A team of scientists, led by Mauro Delogu, virologist（滤过性病原体学者） from the Veterinary Faculty of the Bologna Univers... 阅读全文>>

日期：2010-06-27 On Sunday, NASA's historic Deep Impact spacecraft will fly past Earth for the fifth and last time on its current University of Maryland-led EPOXI mission. At time of closest approach to Earth, the spacecraft will be about 30,400 kilometers (18,900 m... 阅读全文>>

日期：2010-06-27 Scientists at the Department of Energy's Oak Ridge National Laboratory are planning a large-scale, long-term ecosystem experiment to test the effects of global warming on the icy layers of arctic permafrost（永久冻土） . While ORNL researchers have... 阅读全文>>

日期：2010-06-25 ESA's Venus Express is helping planetary（行星的） scientists investigate whether Venus once had oceans. If it did, it may even have begun its existence as a habitable planet similar to Earth. These days, Earth and Venus seem completely different. E... 阅读全文>>

日期：2010-06-25 California's San Andreas fault is notorious（声名狼藉的） for repeatedly generating major earthquakes and for being on the brink of producing the next big one in a heavily populated area. But the famously violent fault also has quieter sections, whe... 阅读全文>>

日期：2010-06-25 Cytomegalovirus ( CMV巨细胞病毒) disease is a serious complication after allogeneic（同种异体的） hematopoietic（造血的） stem cell transplantation (allo-SCT), which is widely accepted as a curative（有疗效的） therapy for advanced hematological（血... 阅读全文>>

日期：2010-06-25 Radical cuts to social welfare spending to reduce budget deficits（预算赤字） could cause not just economic pain but cost lives, warn experts in a study published on bmj.com today. While there is a major debate under way about the potential economic... 阅读全文>>

日期：2010-06-25 Yale University engineers have for the first time created 3D models of whole intact（完整的） mouse organs, a feat（功绩，壮举） they accomplished using fluorescence microscopy（荧光显微法） . The team reports its findings in the May/June issue of t... 阅读全文>>

日期：2010-06-25 For a plant, light is life. It drives everything from photosynthesis（光合作用） to growth and reproduction. Yet the chain of molecular events that enables light signals to control gene activity and ultimately a plant's architecture（建筑学） had re... 阅读全文>>

日期：2010-06-25 A Yale University-led team of scientists reports that it has achieved an important first step in regenerating fully functional lung tissue that can exchange gas, which is the key role of the lungs. Their paper appears in the June 24 issue of Science... 阅读全文>>

日期：2010-06-23 The robust（强健的） jaws and formidable（强大的，可怕的） teeth of some of our ancestors and ape（类人猿） cousins may suggest that humans are wimps when it comes to producing a powerful bite: but a new study has found the opposite is true, with ma... 阅读全文>>

日期：2010-06-23 Cleveland . . . Meet Lucy's great-grandfather. Scientists from The Cleveland Museum of Natural History, Kent State University, Case Western Reserve University, Addis Ababa University and Berkeley Geochronology Center were part of an international te... 阅读全文>>

日期：2010-06-23 A Purdue University researcher hopes a better understanding of the neurological（神经学的） system of the body louse（虱子） through the mapping of its genome will lead to better control or elimination of the human parasite（寄生虫） . Catherine Hil... 阅读全文>>

日期：2010-06-22 The hunger hormone ghrelin（胃饥饿素） , which acts in the brain to stimulate hunger and increase food intake（食物摄取，进食） , heightens the appeal of high-calorie foods over low-calorie foods, according to a study that will be presented Tuesday... 阅读全文>>