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CAPE CANAVERAL, Florida, April 29, (Xinhua) -- NASA on Friday delayed space shuttle Endeavor's launch to no earlier than Monday afternoon due to technical problems with heaters in the shuttle's auxiliary power unit."Shuttle Endeavor's launch now no earlier than Monday at 2:33 p. m. EDT (1833 GMT)," NASA said. "Engineers need that time to troubleshoot an issue that resulted in today's launch scrub."During Friday's countdown, engineers detected a failure in one of two heater circuits associated with Auxiliary Power Unit (APU) 1. Heaters are required to keep the APUs' hydrazine from freezing on orbit.Space shuttle Endeavour sits on the launch pad at the Kennedy Space Center at Cape Canaveral, Florida,  April 28, 2011. The Endeavor is scheduled for a Friday afternoon launch.U.S. President Barack Obama, touring storm damage in Alabama on Friday, had been expected to attend the planned 3:47 p.m. (1947 GMT) launch. Obama will still visit Cape Canaveral and then travel to Miami, where he is scheduled to speak at a community college commencement.Endeavor's 14-day mission will deliver the Alpha Magnetic Spectrometer-2 (AMS) to the International Space Station. AMS, a particle physics detector, is designed to search for various types of unusual matter by measuring cosmic rays.Its experiments are designed to help researchers study the formation of the universe and search for evidence of dark matter, strange matter and antimatter. Endeavor also will fly the a platform that carries spare parts that will sustain space station operations once the shuttles are retired from service.The mission will feature four spacewalks to do maintenance work and install new components. These are the last scheduled spacewalks by shuttle crew members.Endeavor, which has been promised to the California Science Center in Los Angeles upon its return, was the replacement ship for Challenger, which was lost in a 1986 explosion as it ascended over the Atlantic that killed seven astronauts.It will be the second of NASA's three surviving shuttles to be retired. Sister ship Discovery, which will be transferred to the Smithsonian National Air and Space Museum, completed its last flight in March.Atlantis' final launch is scheduled for June 28. When the U.S. space shuttle program officially ends later this year, the Russian space program's Soyuz capsule will be the only method for transporting astronauts to and from the station.

WASHINGTON, April 11 (Xinhua) -- In the first clinical trial of gene therapy for treatment of intractable pain, U.S. researchers from the University of Michigan's Department of Neurology observed that the treatment appears to be able to provide substantial pain relief.In a study published online in the Annals of Neurology and seen on Monday, the researchers showed that the novel agent NP2 is safe and well-tolerated. In addition, measures of pain in the treated patients suggested that NP2 may provide a substantial analgesic effect.NP2 is a gene transfer vector that expresses the naturally- occurring opioid peptide enkephalin. In preclinical work in animals, David Fink, chair of the Department of Neurology, and his coworkers had demonstrated that injection of NP2 into the skin reduces pain in models of pain caused by nerve damage, inflammation or cancer.In the clinical trial, 10 patients with unrelenting pain caused by cancer were injected with the gene transfer agent in the area of skin related to the location of pain."The concept underlying this therapeutic approach is that injection of NP2 into the skin results in uptake into the nervous system and the production and release of a pain-relieving chemical in a controlled site in the pain pathway," says Fink. "In the study, patients who received the low dose of vector showed little reduction in pain; patients receiving the higher doses showed a greater than 80 percent reduction in pain over the course of four weeks following treatment."Fink's laboratory has been working on the use of modified herpes simplex virus-based vectors that are taken up by sensory nerves following skin injection to develop therapies for diseases of the nervous system for more than 20 years. Patents related to this technology have been exclusively licensed by Diamyd Medical, a publicly-traded Swedish biotechnology company that sponsored the trial, and the human-grade vector NP2 was produced by Diamyd, Inc, the U.S. subsidiary of Diamyd Medical.A phase 2 trial to compare NP2 to a placebo control has already been initiated under sponsorship from Diamyd.

LOS ANGELES, April 10 (Xinhua) -- Drinking green tea and practicing Taichi may promote bone health of postmenopausal women and reduce the risk of inflammation, a new study suggests.The study, conducted by researchers at the Laura W. Bush Institute for Women's Health at the Texas Tech University Health Sciences Center, focused on postmenopausal women and investigated the potential for green tea to work synergistically with Taichi in enhancing bone strength of postmenopausal women.Originating as a martial art in China, Taichi is a mind-body exercise that utilizes slow, gentle movements to build strength and flexibility, as well as deep breathing and relaxation, to move qi, or vital energy, throughout the body.The study findings were published Sunday at EurekAlert.org, the website of the American Association for the Advancement of Science (AAAS).Carried out as a double-blind, placebo-controlled, intervention trial (the "holy grail" of scientific studies), this experiment involved 171 postmenopausal women with the average age of 57 who had weak bones but not full-fledged osteoporosis. Subjects were divided into 4 groups -- placebo: starch pill (placebo) and no Taichi; GTP or green tea polyphenols (500 mg/day) and no Taichi; Placebo plus Taichi (starch pill and practising Taichi three times a week); and GTP plus Taichi.The study lasted for 6 months, during which blood and urine samples were collected and muscle strength assessed.The results show that consumption of GTP (at a level equivalent to about four-six cups of steeped green tea daily) and participation in Taichi independently enhanced markers of bone health by three and six months, respectively. A similar effect was found for muscle strength at the 6-month time point. Participants taking Taichi classes also reported significant beneficial effects in quality of life in terms of improving their emotional and mental health.Perhaps most remarkable, however, was the substantial effect that both GTP and Taichi had on biological markers of oxidative stress. Because oxidative stress is a main precursor to inflammation, this finding suggests that green tea and Taichi may help reduce the underlying etiology of not only osteoporosis, but other inflammatory diseases as well.In the study, the researchers developed an animal model (the ovariectomized, middle-aged female rat), with which they could effectively study the effects of green tea consumption on protection against breakdown of the bone's microarchitecture, according to the AAAS.In humans, this can lead to osteoporosis, a condition common to older women. The researchers say what they have learned from the animal models might also be applicable to postmenopausal women.There is a "favorable effect of modest green tea consumption on bone remodeling in this pre-osteoporotic population," said lead researcher Dr. Chwan-Li (Leslie) Shen, an associate professor at the institute.The researchers plan to soon complete a more long-term study utilizing more technically savvy measures of bone density, according to the AAAS.

BEIJING, April 24 (Xinhua) -- The Chinese government has ordered food companies to keep clear and intact records of all their production and selling operations as part of the efforts to prevent the illegal use of food additives.All food manufacturing and management companies must examine all products in stock for any trace of illegal food additives and keep records of the results in accordance with laws and regulations, according to a circular released Sunday by the food safety committee under the State Council, or China's Cabinet.The circular came days after Vice Premier Li Keqiang warned of the great harm from illegal additives in food, promising "a firm attitude, iron-hand measures and more efforts" in dealing with the problem.Companies that fail to keep genuine and intact records and documents will be ordered to reform, and those providing fake records and certificates will be suspended from operations and punished accordingly, said the circular.According to the circular, it is strictly forbidden to produce and sell non-edible materials that are likely to be used in food production without official certificates, and authorized production companies of these materials must adopt a real-name selling system.These materials, including those banned in animal feed and drinking water, should not be sold to food and feed companies, the circular added.A series of food safety scandals emerged in China recently. In one of the latest cases, steamed buns in Shanghai were reported, last week, to have been dyed, sold past their expiration date, or laced with coloring additives to mislead consumers.

来源：资阳报