安徽气管壁解剖模型(湖南心脏收缩、舒张与瓣膜开闭演示模型) (今日更新中)

LOS ANGELES, April 7 (Xinhua) -- Unrecycled energy-efficient bulbs release tons of mercury into the environment every year, raising an environmental concern, it was reported on Thursday.Demand for the energy-efficient lights -- the compact fluorescent light bulb (CFL) -- is growing as government mandates for energy-efficient lighting take effect, yet only about two percent of residential consumers and one-third of businesses recycle the new bulbs, the Los Angeles Times said, quoting the Association of Lighting and Mercury Recyclers (ALMR).Each CFL contains up to five milligrams of mercury, a potent neurotoxin that's on the worst-offending list of environmental contaminants, the report said.As a result, U.S. landfills are releasing more than four tons of mercury annually into the atmosphere and storm water runoff, the Journal of the Air and Waste Management Association said in a study published by the paper.The federal Clean Energy Act of 2007 established energy- efficiency standards for light bulbs that dimmed the future for old-fashioned incandescents, which don't meet those standards. Incandescents are to be phased out by 2014 in the U.S., and California passed even stricter rules, calling for store shelves to be cleared of them by 2013.The old-style bulbs are just too wasteful, converting to light only 10 percent of the energy they consume. The rest is squandered as heat.Sales of energy-efficient alternatives like CFLs, halogen bulbs and LEDs have been growing steadily, with the low-cost CFLs the biggest sellers, according to the paper.If every California household replaced five incandescent bulbs with CFLs, the move would save 6.18 billion kilowatt-hours and prevent the annual release of 2.26 million tons of heat-trapping carbon dioxide, according to the California Energy Commission. That 's equivalent to taking 414,000 cars off the road.But no federal law mandates recycling of household fluorescent lights. Federal rules exempt some businesses, based in part on the number of bulbs used, said Paul Abernathy, executive director of the ALMR, which is based in Napa, Calif.Several states, including California, Massachusetts, Maine, Vermont and Minnesota, do require that all households and businesses recycle fluorescents, the paper said.But the ALMR said compliance is low because of a lack of convenient drop-off options.

CANBERRA, May 27 (Xinhua) -- An Australian student has discovered a part of the universe that astrophysicists have spent decades trying to find, Australia's Monash University on Friday confirmed in a statement.Astrophysicists have long thought the universe has a greater mass than is visible in the planets, but they had no way of proving it is there.Undergraduate student Amelia Fraser-McKelvie, 22, was on a summer internship at Monash University to learn more about astrophysics, when she managed to solve one of the big mysteries of science.Fraser-McKelvie, an aerospace engineering student, conducted a targeted X-ray search for the matter and found evidence of it within three months.Her tutor, Kevin Pimbblet, said the discovery is significant."We've been looking for this ordinary matter for a couple of decades," he said in a statement on Friday."It's been published in one of the most prestigious journals in the world, so astronomers all over the world will be able to read this article."Scientists had thought the matter would have a temperature of about 1 million degrees Celsius, 1.8 million degrees Fahrenheit, and should therefore be observable at X-ray wavelengths.Amelia Fraser-McKelvie's discovery has proved that prediction is correct, Pimbblet said.The trio published a research paper on the missing mass in one of the world's oldest and most prestigious scientific journals, Monthly Notices of the Royal Astronomical Society.He said the discovery could change the way telescopes are built.

BEIJING, Jan. 30 (Xinhua) -- China hoped Egypt could restore social stability and normal order at an early date, Foreign Ministry spokesman Hong Lei said Sunday."China has been closely watching the development of the situation in Egypt," Hong said when asked to comment on the ongoing turmoil in the country."Egypt is a friendly country with China, and we hope Egypt could restore social stability and normal order at an early date," he said.

WASHINGTON, May 25 (Xinhua) -- The number of young adults in the United States with high blood pressure may be much higher than previously reported, according to a new study by researchers at the University of North Carolina (UNC) at Chapel Hill.Researchers analyzed data on more than 14,000 men and women between 24 and 32 years old in 2008 from the National Longitudinal Study of Adolescent Health, known as Add Health. They found 19 percent had elevated blood pressure, also referred to as hypertension. Only about half of the participants with elevated blood pressure had ever been told by a health-care provider that they had the condition."The findings are significant because they indicate that many young adults are at risk of developing heart disease, but are unaware that they have hypertension," said Quynh Nguyen, a doctoral student at UNC's Gillings School of Global Public Health and the study's lead author. Hypertension is a strong risk factor for stroke and coronary heart disease, the leading cause of death for adults in the United States.The findings were published this week in the journal Epidemiology.Kathleen Mullan Harris, Add Health's principal investigator and a co-author of the paper, said the findings were noteworthy because they were from the first nationally representative, field- based study of blood pressure to focus on young adults."The message is clear," said Harris. "Young adults and the medical professionals they visit shouldn't assume they're not old enough to have high blood pressure. This is a condition that leads to chronic illness, premature death and costly medical treatment."

BEIJING, April 12 (Xinhuanet) -- Doctors may choose riskier treatment with fewer severe side effects for themselves than they'd recommend for their patients, according to a study in the Archives of Internal Medicine Tuesday. In the study, two sets of questions were sent to primary care physicians around the United States. One involved choosing between two types of colon cancer surgery and the other situation involved choosing no treatment for the flu, or choosing a made-up treatment less deadly than the disease but which could cause permanent paralysis. Of 242 physicians who answered the colon cancer questionnaire, 38 percent went with the treatment that carried a higher risk of death but fewer side effects for themselves. By contrast, only a quarter said they would recommend that treatment to their patients.In the flu scenario, 63 percent chose the deadlier option of no treatment for themselves, versus 49 percent recommending it for patients.The findings are important because patients faced with difficult medical decisions often ask their doctors, "What would you do?" The answer reflects the doctors' values -- not necessarily those of the patients.Doctors should know what their patients value most before giving advice, and patients should ask doctors the reasons behind their answers, said study author Dr. Peter Ubel, an internist and behavioral scientist at Duke University.

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