日期：2013-08-29 When a beating heart slips into an irregular, life-threatening rhythm, the treatment is well known: deliver a burst of electric current from a pacemaker or defibrillator（去纤颤器） . But because the electricity itself can cause pain, tissue damage... 阅读全文>>

日期：2013-08-29 For the first time, astronomers have seen the image of a distant quasar（类星体） split into multiple images by the effects of a cloud of ionized gas in our own Milky Way Galaxy. Such events were predicted as early as 1970, but the first evidence fo... 阅读全文>>

日期：2013-08-29 How tiny fish larvae travel away from the reef, then know how to navigate their way back home is a scientific mystery. A new study led by Dr. Claire Paris, Professor at the University of Miami (UM) Rosenstiel School of Marine Atmospheric Science con... 阅读全文>>

日期：2013-08-29 An analysis of gravity and topography（地势） data from Saturn's largest moon, Titan, has revealed unexpected features of the moon's outer ice shell. The best explanation for the findings, the authors said, is that Titan's ice shell is rigid and tha... 阅读全文>>

日期：2013-08-28 A new study by Anna Maria Niewiadomska and Robert Gifford, of The Aaron Diamond AIDS Research Center, New York, reveals that reticuloendotheliosis（网状内皮组织增殖） viruses (REVs), which originated in mammals, spread to birds as a result of medica... 阅读全文>>

日期：2013-08-28 Like volunteers handing out cups of energy drinks to marathon runners, specially engineered helper cells transplanted along with stem cells can dole out（少量发放） growth factors to increase the stem cells' endurance, at least briefly, Johns Hopkin... 阅读全文>>

日期：2013-08-28 Do violent video games such as 'Mortal Kombat,' 'Halo' and 'Grand Theft Auto' trigger teenagers with symptoms of depression or attention deficit disorder to become aggressive bullies or delinquents（流氓，行为不良的人） ? No, according to Christophe... 阅读全文>>

日期：2013-08-28 Computer models are used to inform policy decisions about energy, but existing models are generally black boxes that don't show how they work, making it impossible for anyone to replicate their findings. Researchers from North Carolina State Univers... 阅读全文>>

日期：2013-08-28 Supervolcanoes, such as the one sitting dormant（休眠的，静止的） under Yellowstone National Park, are capable of producing eruptions thousands of times more powerful than normal volcanic eruptions. While they only happen every several thousand year... 阅读全文>>

日期：2013-08-28 A greater focus on the role of microbiology in agriculture combined with new technologies can help mitigate（减轻，缓和） potential food shortages associated with world population increases according to a new report from the American Academy of Micr... 阅读全文>>

日期：2013-08-28 New research suggests that getting depressed when it's cold and dreary（沉闷的） outside may not be as common as is often believed. In a study recently published online in the Journal of Affective Disorders, researchers found that neither time of ye... 阅读全文>>

日期：2013-08-28 Two treatments that slow the development of diabetes also may protect people from heart disease, according to a recent study accepted for publication in The Endocrine Society's Journal of Clinical Endocrinology Metabolism (JCEM). Researchers examine... 阅读全文>>

日期：2013-08-24 Satellite pictures of Saharan dust clouds have been in the news all summer, but to Shankar Chellam, they have just raised more questions. How much impact did the Saharan dust have on Houston's air? Is it more toxic than our home-grown dust? Chellam,... 阅读全文>>

日期：2013-08-24 How do you track a fish? There's no Google Maps for finding fish. The radio signals that are the backbone of traditional GPS cannot pass through seawater. But sound travels remarkably well, so scientists often use acoustic telemetry（声波遥测） to e... 阅读全文>>

日期：2013-08-24 Sea ice decline and warming trends are changing the vegetation in nearby arctic coastal areas, according to two University of Alaska Fairbanks scientists. Uma Bhatt, an associate professor with UAF's Geophysical Institute, and Skip Walker, a profess... 阅读全文>>

日期：2013-08-24 In a pioneer study published in the latest issue of the scientific journal Nature Communications, a research team at the Instituto Gulbenkian de Cincia (IGC; Portugal), led by Miguel Godinho Ferreira in collaboration with Isabel Gordo, show for the... 阅读全文>>

日期：2013-08-23 Native Brazilian fruits grown in arid（干旱的） climates and poor soil have similar antioxidant activity to conventionally grown Red Delicious apples, according to research published August 21 in the open access journal PLOS ONE by Sandra Fernandes... 阅读全文>>

日期：2013-08-23 Retirees should be masters of their own destiny, and actively manage and plan their free time to ensure a happy and fulfilling retirement. This is the advice of Wei-Ching Wang of the I-Shou University in Taiwan, leader of a study published in Spring... 阅读全文>>

日期：2013-08-23 Cattle contribute to global warming by burping（打嗝） and farting（放屁） large amounts of greenhouse gases. Some of the same gases are also emitted from cow pats on pastures. But now researchers from the University of Helsinki have found that beet... 阅读全文>>

日期：2013-08-23 Antarctic krill（南极虾） are usually less than 6 cm in length but their size belies the major role they play in sustaining much of the life in the Southern Ocean. They are the primary food source for many species of whales, seals, penguins and fish... 阅读全文>>