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WASHINGTON, May 20 (Xinhua) -- Two U.S. astronauts conducted the first of four spacewalks for space shuttle Endeavour's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) said.According to the U.S. space agency, Endeavour's mission specialists Andrew Feustel and Greg Chamitoff completed the six-hour, 19-minute spacewalk at 9:29 a.m. EDT (1329 GMT). They successfully installed antennas for the External Wireless Communication system, routing cables, setting up the antenna, installing handrails, and connecting power cables.Because of a carbon dioxide sensor failure in Chamitoff's spacesuit, flight controllers limited his spacewalk time to about six hours 20 minutes, 10 minutes less than the planned six hours and 30 minutes. There was no indication his suit's carbon dioxide levels would rise. However, they deferred tasks to remove a micrometeoroid debris shield to access and attach some of the connection points.This was the 245th spacewalk conducted by U.S. astronauts. It was Feustel's fourth spacewalk for a total time of 27 hours and 17 minutes, and Chamitoff's first.Endeavour lifted off on Monday morning from Kennedy Space Center in Florida, to deliver to the International Space Station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer (AMS).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.

WELLINGTON, May 24 (Xinhua) -- New Zealand researchers have found a way to stop the growth of certain cancer tumors by " silencing" a group of PAX genes, members of a small family of genes that play important roles in embryonic development, but also allow cancer cells to grow and divide in adult tissue.In an article published in UK medical journal Oncogene, Otago University Professor Michael Eccles and colleagues revealed how they used the PAX8 gene to kill cancer cells.After detecting high levels of PAX8 protein in the majority of kidney, ovarian and thyroid cancers they studied, the researchers used molecular techniques to silence the PAX8 gene in several cancer cell lines."We found that these PAX8-depleted cancer cells ceased growing and dividing. The cells were essentially stopped in their tracks through the failure of multiple mechanisms and pathways crucial to their cell division cycle. They then entered into a state called senescence in which they no longer divided, and after that they ultimately died," Eccles said in a statement from the university Tuesday.The findings suggested that PAX8 could be a good target for the development of new cancer therapies, he said."Any resulting drugs would be a long way down the road, but in the meantime this research helps confirm that a focus on PAX genes may prove to be a fruitful line of attack against a number of cancers," he said.The research was supported by grants from the Health Research Council of New Zealand. It formed the main piece of work carried out by Otago doctoral graduate Caiyun (Grace) Li, now a postdoctoral fellow at Stanford University. Study co-authors also included Professor Antony Braithwaite and master's student Jen Nyman.In 2003, research led by Eccles discovered that proteins from one or more of the nine PAX genes were present in many common cancers. They found that "silencing" the gene expression of PAX2 in ovarian and bladder cancer cells, and of PAX3 in melanoma, led to the rapid death of the cells.

KAMPALA, May 14 (Xinhua) -- The deadly Ebola hemorrhagic fever has broken out in Uganda, killing one person and leaving over 30 others being monitored by health officials, ministry of health announced here on Saturday.The epicenter of the outbreak is in the central Ugandan district of Luwero located about 50 km north of the capital Kampala.According to Anthony Mbonye, head of the community health department at the ministry of health, a 12 year old girl in Zirombwe Sub-county developed symptoms of Ebola and when she was admitted at a military hospital in the district, laboratory test confirmed that it was Ebola.The Ebola virus is highly contagious and causes a range of symptoms including fever, vomiting, diarrhea, generalized pain or malaise and in many cases internal and external bleeding.The girl died on May 6 and about 30 people who she got contact with are being asked to not get into contact with the public as health officials monitor them for about 21 days.The 30 people have not yet developed the symptoms but if they do, they will be isolated from the public.Mbonye said that preliminary investigations have showed that this Ebola virus is similar to the one that broke out in Sudan, thus named Sudan Ebola.The epicenter of the outbreak is also located along the high way to southern Sudan.This viral subtype has a human case fatality rate of 60 percent meaning that it will kill 60 percent of the infected people.The other subtype is the Congo Ebola which also attacked Uganda in 2007. This one has a human case fatality rate of over 80 percent.The 2007 outbreak which occurred in the western district of Bundibugyo bordering eastern Democratic Republic of Congo claimed 37 lives out of the 148 infected.Mbonye said that there also ongoing investigations to find out whether the index case got into contact with moneys or bats, the known reservoirs of the Ebola virus.Following the outbreak, government has reactivated the National Ebola Task Force (NETF) to coordinate the fight against the disease at the national level.District task forces are also in the process of being formed according to Mbonye, who is the chairperson of the NETF.

BEIJING, Feb. 14 (Xinhuanet) -- The exchange rate against the US dollar is currently at an appropriate level but could fluctuate in the future, Yi Gang, vice-governor of the central bank and head of the State Administration of Foreign Exchange, said on Sunday."In the future, as markets fluctuate and labor productivity changes, the rate will certainly show some fluctuation," he said at a seminar. Last Thursday, the yuan's central parity rate rose to a record high of 6.5849 against the US dollar, after rising for three consecutive trading days, before declining to 6.5952 on Friday.The yuan has appreciated about 3.6 percent against the dollar since mid-June. A report from the US Treasury said earlier that on an inflation-adjusted basis, the appreciation was even higher, at an annual rate of more than 10 percent.US Federal Reserve Chairman Ben Bernanke said last Wednesday that China's recent measures to control inflation by raising interest rates is "surprising" and urged Beijing to let its currency rise in value.Currently the exchange rate is still underestimated by no more than 10 percent, said Lu Mai, secretary-general of the China Development Research Foundation (CDRF).The resilience of exporters to the rising yuan is stronger than previously estimated, which helps to pave the way for more currency reform to liberalize the yuan, he said.In 2007 and 2008, the Chinese currency rose by 7 percent annually against the US dollar, but China's GDP only declined by 0.28 percentage points, with inflation down by 0.42 points and workers' wages up by 0.07 points, according to CDRF research."The figures showed that progressive currency reform since July 2005 was successful, and the government should accelerate the reform and further free the yuan in the next five years to promote healthy, long-term economic development," Lu said.China should keep the proportion of its trade surplus to GDP within 5 percent, and avoid further increasing its huge foreign exchange reserves to allow the currency to settle at a balanced level, he said.China's foreign reserves rose to a record .85 trillion at the end of last year, an 18.7 percent increase year-on-year, according to statistics from the People's Bank of China, the central bank.Yi said he took note of the CDRF findings, but emphasized that further moves depended on both the domestic and international economic situation and appropriate timing.Lu Feng, an economist at Peking University, said now is the right time to deepen currency reform and let the yuan trade at a higher price as inflation is rising.Analysts have predicted that the yuan will appreciate this year as inflation may see the government opt for a rising yuan to lower the cost of purchasing international commodities.Lian Ping, chief economist at the Bank of Communications, predicted the yuan would rise by 5 to 7 percent in 2011.