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LOS ANGELES, April 2 (Xinhua) -- People taking antidepressants may be more likely to develop thicker arteries which may raise the risk of heart disease and stroke, a new study suggests.Depression can heighten the risk for heart disease, but the effect of antidepressant use is separate and independent from depression itself, according to the study make public by the American Association for the Advancement of Science (AAAS) on Saturday.The data suggest that antidepressants may combine with depression for a negative effect on blood vessels, said study first author Amit Shah, MD, a cardiology fellow at Emory University School of Medicine.Study findings will be presented on April 5 at the American College of Cardiology meeting in New Orleans, according to the AAAS.The study included 513 middle-aged male twins who both served in the U.S. military during the Vietnam War. Twins are genetically the same but may be different when it comes to other risk factors such as diet, smoking and exercise, so studying them is a good way to distill out the effects of genetics.Researchers measured carotid intima-media thickness - the thickness of the lining of the main arteries in the neck -- by ultrasound. Among the 59 pairs of twins where only one brother took antidepressants, the one taking the drugs tended to have higher carotid intima-media thickness (IMT), even when standard heart disease risk factors were taken into account.The effect was seen both in twins with or without a previous heart attack or stroke. A higher level of depressive symptoms was associated with higher IMT only in those taking antidepressants."One of the strongest and best-studied factors that thickens someone's arteries is age, and that happens at around 10 microns per year," Shah said. "In our study, users of antidepressants see an average 40 micron increase in IMT, so their carotid arteries are in effect four years older."Antidepressants' effects on blood vessels may come from changes in serotonin, a chemical that helps some brain cells communicate but also functions outside the brain, Shah said."I think we have to keep an open mind about the effects of antidepressants on neurochemicals like serotonin in places outside the brain, such as the vasculature. The body often compensates over time for drugs' immediate effects," Shah said. " Antidepressants have a clinical benefit that has been established, so nobody taking these medications should stop based only on these results. This isn 't the kind of study where we can know cause and effect, let alone mechanism, and we need to see whether this holds up in other population groups."

LOS ANGELES, April 12 (Xinhua) -- With the help of NASA Telescopes, astronomers have uncovered one of the youngest galaxies in the distant universe, with stars that formed 13.5 billion years ago, the Jet Propulsion Laboratory (JPL) announced on Tuesday.The finding addresses questions about when the first galaxies arose, and how the early universe evolved, JPL noted in a press release.Infrared data from both the Hubble Space Telescope and the post- coolant, or "warm," phase of NASA's Spitzer Space Telescope mission revealed that the galaxy's stars are quite mature, which means they must have formed when the universe was just a toddler, said JPL in Pasadena, Los Angeles.This challenges theories of how soon galaxies formed in the first years of the universe and could even help solve the mystery of how the hydrogen fog that filled the early universe was cleared, according to astronomers involved in the study.This galaxy is not the most distant ever observed, but it is one of the youngest to be observed with such clarity, JPL said.Normally, galaxies like this one are extremely faint and difficult to study, but, in this case, nature has provided the astronomers with a cosmic magnifying glass, JPL said.The galaxy's image is being magnified by the gravity of a massive cluster of galaxies parked in front of it, making it appear 11 times brighter. This phenomenon is called gravitational lensing."Without this big lens in space, we could not study galaxies this faint with currently available observing facilities," said Eiichi Egami of the University of Arizona in Tucson. "Thanks to nature, we have this great opportunity to see our universe as it was eons ago."The findings may help explain how the early universe became " reionized," according to JPL."Seeing a galaxy as it appeared near the beginning of the universe is an awe-inspiring feat enabled by innovative technology and the fortuitous effect of gravitational lensing," Jon Morse, NASA's Astrophysics Division director at the agency's headquarters in Washington, said in the release."Observations like this open a window across space and time, but more importantly, they inspire future work to one day peer at the stars that lit up the universe following the big bang."

CHICAGO, Jan. 20 (Xinhua) -- Chinese President Hu Jintao arrived here on Thursday afternoon from Washington, after meetings with U.S. President Barack Obama on major bilateral and world issues.During their talks Wednesday, the two leaders agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit.In Chicago, Hu will meet local officials and visit a high school, Chinese officials said.Chinese President Hu Jintao (R front) meets with Mayor of Chicago Richard Daley(L front) in Chicago, the United States, Jan. 20, 2011. Hu arrived in Washington Tuesday for a four-day visit to the United States. The trip, his second as head of state, is aimed at enhancing the positive, cooperative and comprehensive relationship between China and the United States.The Chinese president visited the United States in April 2006.

BEIJING, Feb. 17 (Xinhua) -- China's new rules for reviewing proposed mergers and acquisition (M&A) deals by foreign firms on grounds of national security would benefit both Chinese and foreign investors, a Ministry of Commerce (MOC) spokesman said Thursday.The rules will facilitate the growth of foreign-invested enterprises (FIEs) in China and improve the quality and structure of foreign direct investment (FDI) flowing into China, MOC spokesman Yao Jian said at a press conference.The move also marked an improving legal environment for the security of China's business sector along with its opening-up drive, given that M&A by FIEs will increasingly become a trend in the coming years, Yao said."The adoption of the rules in China will also increase policy transparency and improve law-based government administration," said Yao.Yao's words came after the State Council, China's Cabinet, announced last Saturday that it was establishing a panel to check whether M&A deals struck by foreign firms in the country endanger national security.The panel will review attempts by FIEs to buy or merge with domestic companies whose business pertains to national defence, agriculture, energy, resources, key infrastructure, transport systems, key technology sectors and important equipment manufacturing industries, according to a statement published on the central government's website www.gov.cn.The review will be conducted by a foreign investment security review board under the cabinet, members of which come from the National Development and Reform Commission (NDRC), the MOC and other agencies.The new regulations, which take effect in March, come at a time when China is expected to see more M&A deals struck by foreign firms.Currently, inward M&A accounts for about 3 percent of China's total FDI, a sharp contrast with the global average level of more than 70 percent, said Yao. "M&A by FIEs will become a major trend in China."China's taking in FDI through more M&A will promote industrial consolidation and restructuring, and it will also mean more efficient utilization of the existing resources, he said."As the share of M&A in the FDI will probably rise from the current 3 percent to 8 percent, 10 percent or even more, it is necessary to timely formulate China's own rules governing foreign takeovers in line with international standards," Yao said.In April 2010, the State Council said in a statement that foreign investment should be allowed to be more diversified and foreign investors encouraged to participate in the consolidation and restructuring of domestic firms via equity holdings or acquisitions.He Manqing, a researcher with the Chinese Academy of International Trade and Economic Cooperation of the MOC, said "It is right and proper to impose regulations and requirements on proposed M&A deals in the sectors of strategic importance and those involving national security.""The introduction of the regulations conforms to the new trend in China's receiving of FDI and indicates that China's regulations on FDI are becoming more mature," said He.The NDRC said Wednesday that national security scrutiny would only occur when foreign companies take a majority stake in a domestic M&A deal, meaning that a minority stake purchase will not trigger a review."The new rules draw references from similar rules in the United States, Germany and Canada," the NDRC said in a statement on its website.The NDRC also said that the new regulations were in line with World Trade Organization rules and did not imply that China had changed its policies on opening up and attracting FDI.China's FDI jumped 23.4 percent in January to 10.03 billion U.S. dollars, said Yao. The monthly growth rate was up from December's 15.6 percent.As the world's top investment destination, China received a total of 105.74 billion U.S dollars in FDI in 2010, up 17.4 percent year on year, the MOC said last month.

来源：资阳报