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LOS ANGELES, April 7 (Xinhua) -- Using NASA's Galaxy Evolution Explorer (GEE) satellite, U.S. astronomers are hunting for nearby, hard-to-see stars which could very well be home to the easiest-to-see alien planets, it was announced on Thursday.U.S. astronomers are ferreting out the new targets after the glare of bright, shining stars has frustrated most efforts at visualizing distant worlds, NASA's Jet Propulsion Laboratory (JPL) said.So far, only a handful of distant planets, or exoplanets, have been directly imaged. Small, newborn stars are less blinding, making the planets easier to see, but the fact that these stars are dim means they are hard to find in the first place."Fortunately, the young stars emit more ultraviolet light than their older counterparts, which makes them conspicuous to the ultraviolet-detecting GEE," JPL said in a press release."We've discovered a new technique of using ultraviolet light to search for young, low-mass stars near the Earth," said David Rodriguez, a graduate student of astronomy at University of Californian, Los Angeles. "These young stars make excellent targets for future direct imaging of exoplanets."Young stars, like human children, tend to be a bit unruly -- they spout a greater proportion of energetic X-rays and ultraviolet light than more mature stars. In some cases, X-ray surveys can pick out these youngsters due to the "racket" they cause. However, many smaller, less "noisy" baby stars perfect for exoplanet imaging studies have gone undetected except in the most detailed X-ray surveys. To date, such surveys have covered only a small percentage of the sky, according to JPL in Pasadena, Los Angeles.Rodriguez and his team figured that the GEE, which has scanned about three-quarters of the sky in ultraviolet light, could fill this gap.Astronomers compared readings from the telescope with optical and infrared data to look for the telltale signature of rambunctious junior stars. Follow-up observations of 24 candidates identified in this manner determined that 17 of the stars showed clear signs of youth, validating the team's approach, JPL said."The Galaxy Evolution Explorer can readily select young, low- mass stars that are too faint to turn up in all-sky X-ray surveys, which makes the telescope an incredibly useful tool," Rodriguez said in the release.

BEIJING, Jan. 27 (Xinhua) -- China's foreign exchange watchdog said Thursday that the surplus of Chinese banks' foreign exchange purchases to sales in client transactions increased 51 percent through 2010 to stand at 397.7 billion U.S. dollars at year-end.China' s institutional and individual clients sold 1.33 trillion U.S. dollars in foreign exchange to banks in 2010 while purchasing 932.7 billion U.S. dollars, said the State Administration of Foreign Exchange (SAFE) in an online statement.In 2009, the annual surplus fell 42 percent to 263.5 billion U.S. dollars, according to SAFE's data released in March 2010.The statement noted the figures did not include banks' own forex transactions and interbank transactions.The forex surplus in December 2010 totaled 51.5 billion U.S. dollars, as clients sold 146.2 billion U.S. dollars of foreign exchange, up 13 percent from November, while purchasing 94.7 billion U.S. dollars, up 12 percent, it said.Chinese banks received 1.89 trillion U.S. dollars for their clients in overseas business in 2010 and paid 1.59 trillion U.S. dollars to overseas business, it added.The SAFE only began releasing monthly and quarterly data on bank foreign exchange transactions in 2010.

WASHINGTON, April 29 (Xinhua) -- A U.S. appeals court ruled on Friday that the Obama administration can continue the taxpayer- funding for human embryonic stem cell research.The U.S. Court of Appeals in Washington overturned a preliminary federal court order that would have blocked the U.S. Health and Human Services Department and the National Institutes of Health (NIH) from spending government money on embryonic stem cells research."Today's ruling is a victory for our scientists and patients around the world who stand to benefit from the groundbreaking medical research they're pursuing," said Nicholas Papas, a White House spokesman.U.S. President Barack Obama has been trying to expand government funding for human embryonic stem cells research, saying that years of progress on finding cures for spinal cord injuries, Parkinson's disease and other diseases would be lost without the government support on this field.Opponents have been arguing the research is unacceptable because embryonic stem cells can only be obtained through destroying human embryos.Last August, a federal judge ruled that the government-backed embryonic stem cell research violated the law because embryos were destroyed in the process and it jeopardized the position of researchers using adult stem cells for winning federal grants.The government immediately appealed to the ruling, and the appeals court said the research could continue at the NIH before the judge ruled on the case.

LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.

DAVOS, Switzerland, Jan. 27 (Xinhua) -- A policy of more trade and greater openness to the rest of the world has brought significant benefits to China and greater market opportunities to its trading partners, the head of the World Trade Organization says."I don't think there is any question that China joining the WTO has been a very good thing for China and for the WTO and its members," WTO Director General Pascal Lamy said in an interview with Xinhua.The WTO chief was expected to join the forum "China's Impact on Global Trade and Growth" on the sidelines of the World Economic Forum annual meeting held in this Swiss alpine town."In joining the WTO, China successfully underpinned a policy of what had been 20 years of progressive openness," Lamy said.Adherence to economic reforms through international commitments ensured that China would stay on the path of openness, he noted, adding that the policy has helped the country economically, politically and socially.Lamy stressed that China has done a "remarkable job" in reducing poverty, which is an important task for the country, along with registering double-digit growth, thus becoming the world's largest manufacturer and the second largest economy.Apart from enhanced market access with its trading partners and more equal treatment in global trade, WTO membership also has allowed China to gain access to the organization's dispute settlement system, Lamy said.According to a WTO report issued in December, as the world's biggest exporter, China ranks first in receiving anti-dumping (AD) investigations, with 23 new AD initiations directed at its exports in the first half of 2010.In recent rulings arbitrated by the WTO Dispute Settlement Body (DSB), China has won a poultry dispute against the United States, and a steel fastener case against the European Union.Being a WTO member, "China would have a seat at the table as negotiations commenced on the trade rules for the 21st century," Lamy said, referring to the decade-long Doha round of global trade negotiations aimed at building the next generation trading system.Even more importantly, for China, participation in the global system of rules and discipline greatly boosted investors' confidence and helped facilitate foreign direct investment in China, he said.On the other side of the coin, China's integration into the world trading system has given enormous driving force to the global economy and market opportunity to its trade partners.