日期：2013-09-22 A magnitude 8.3 earthquake that struck deep beneath the Sea of Okhotsk on May 24, 2013, has left seismologists struggling to explain how it happened. At a depth of about 609 kilometers (378 miles), the intense pressure on the fault（断层） should in... 阅读全文>>

日期：2013-09-22 Carbon nanotubes' outstanding mechanical, electrical and thermal properties make them an alluring（诱惑的） material to electronics manufacturers. However, until recently scientists believed that growing the high density of tiny graphene cylinders n... 阅读全文>>

日期：2013-09-22 Mayo Clinic researchers have shown that a specific protein pair may be a successful prognostic（预兆） biomarker for identifying smoking-related lung cancers. The protein -- ASCL1 -- is associated with increased expression of the RET oncogene, a par... 阅读全文>>

日期：2013-09-21 Three new species of tiny frogs from Papua New Guinea are described in the latest issue of Zookeys. Dr Fred Kraus, University of Michigan, who in 2011 in Zookeys described the world's smallest frogs Paedophryne dekot and Paedophryne verrucosa, now a... 阅读全文>>

日期：2013-09-21 Earthworms are a welcomed sight in many gardens and yards since they can improve soil structure and mixing. But they are hard to find in the drier soils of eastern Colorado where water and organic matter is limited. Adding earthworms to fields where... 阅读全文>>

日期：2013-09-21 A team of scientists from Canada and Australia has discovered that a decline in shark populations is detrimental（有害的） to coral reefs. Where shark numbers are reduced due to commercial fishing, there is also a decrease in the herbivorous fishes... 阅读全文>>

日期：2013-09-21 Calcium can do much more than strengthen bones. The mineral is a critical nutrient for healthy tree growth, and new research shows that adding it to the soil helps reverse the decades-long decline of forests ailing（生病，苦恼） from the effects of... 阅读全文>>

日期：2013-09-21 Each of our cells has an energy furnace（火炉，熔炉） , and it is called a mitochondrion（线粒体） . A Northwestern University-led research team now has identified a new mode of timekeeping that involves priming the cell's furnace to properly use st... 阅读全文>>

日期：2013-09-21 A prominent tuft（一簇） of spiny hair on the back, a white tail tip and three pairs of teats（乳头） represent the unique set of characteristics describing a new genus of rat which has been discovered in the Moluccan province of Indonesia. This reg... 阅读全文>>

日期：2013-09-21 Why don't trees bleed to death when they are injured? Researchers from Virginia Tech, the Georg-August University of Gottingen, Germany, and the Jackson Laboratory of Bar Harbor, Maine, have discovered how check valves（止回阀） in wood cells contro... 阅读全文>>

日期：2013-09-18 A small pilot study shows for the first time that changes in diet, exercise, stress management and social support may result in longer telomeres（染色体终端） , the parts of chromosomes that affect aging. It is the first controlled trial to show tha... 阅读全文>>

日期：2013-09-18 Each cell in an organism has a sensor that measures the health of its internal environment. This alarm is found in the endoplasmic reticulum ( ER内质网 ), which is able to sense cellular stress and trigger either rescue responses or the death of the... 阅读全文>>

日期：2013-09-18 Separating target molecules in biological samples is a critical part of diagnosing and detecting diseases. Usually the target and probe molecules are mixed and then separated in batch processes that require multiple pipetting（移液，吸量） , tube wa... 阅读全文>>

日期：2013-09-18 A first-ever study of air trapped in the deep snowpack of Greenland shows that atmospheric levels of carbon monoxide (CO) in the 1950s were actually slightly higher than what we have today. This is a surprise because current computer models predict... 阅读全文>>

日期：2013-09-18 In the long sprint（冲刺，短跑） to find new sources of clean, low-cost power, slow and steady might win the race -- the slow-moving water of currents and tides, that is. Just as wind turbines tap into the energy of flowing air to generate electrici... 阅读全文>>

日期：2013-09-17 From bird flu to the West Nile virus, bird diseases can have a vast impact on humans. Thus, understanding bird immune systems can help people in a variety of ways, including protecting ourselves from disease and protecting our interests in birds as... 阅读全文>>

日期：2013-09-17 Using data from the world's ecosystems and predictions of how climate change will impact them, scientists from the Wildlife Conservation Society, the University of Queensland, and Stanford University have produced a roadmap that identifies the world... 阅读全文>>

日期：2013-09-17 New research from the Niels Bohr Institute shows that cement made with waste ash from sugar production is stronger than ordinary cement. The research shows that the ash helps to bind water in the cement so that it is stronger, can withstand higher p... 阅读全文>>

日期：2013-09-17 Cranberries are important agricultural commodities in states such as Massachusetts, Wisconsin, New Jersey, Washington, and Oregon. But cranberry-growing operations are challenged by weeds, which compete for precious resources and often decrease frui... 阅读全文>>

日期：2013-09-17 Philosophers and scientists have long puzzled over where human imagination comes from. In other words, what makes humans able to create art, invent tools, think scientifically and perform other incredibly diverse behaviors? The answer, Dartmouth res... 阅读全文>>