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WASHINGTON, May 25 (Xinhua) -- Two U.S. astronauts conducted the third of four scheduled spacewalks for space shuttle Endeavour 's STS-134 mission on Wednesday morning, the U.S. National Aeronautics and Space Administration (NASA) announced.Endeavour's mission specialists Drew Feustel and Mike Fincke completed a six-hour-54-minute spacewalk at 8:37 a.m. EDT (1437 GMT). They completed all planned tasks, installing cables to increase redundancy for the power system on the Russian segment of the station, completing the external wireless antenna system work Feustel and Greg Chamitoff began during the first spacewalk, and installing a power and data grapple fixture to Zarya. The fixture will allow the station's robotic arm to "walk" to the Russian segment, extending its reach by using that grapple fixture as a base.It was the 247th spacewalk conducted by U.S. astronauts, and the 158th in support of space station assembly and maintenance, totaling 995 hours and 13 minutes. If everything goes as planned, the 1,000th hour of space station assembly and maintenance will be logged on Friday.Endeavour lifted off on May 16 from the 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.NASA's 30-year-old shuttle program is ending due to high operating costs. The Obama administration wants to spur private companies to get into the space taxi business, freeing NASA to focus on deep space exploration and new technology development.There were initially five space shuttles in the fleet -- Challenger exploded shortly after liftoff in 1986 and Columbia disintegrated on its way back to Earth in 2003. Discovery retired earlier this year, while Endeavour is currently on its final mission. A last mission for Atlantis is scheduled for July, though funding for Atlantis remains in question.The sixth shuttle, Enterprise, did test flights in the atmosphere but was never flown into space. It is already on display at a museum outside Washington.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.

BEIJING, Jan. 27 (Xinhua) -- The State Council, China's cabinet, has approved on a trial basis the launch of property tax reforms in some cities.The pilot reform will tax property owner-occupiers for the first time, officials from the Ministry of Finance, the State Administration of Taxation and the Ministry of Housing and Urban-Rural Development said Thursday.China's 1986 provisional property tax regulations did not tax owner-occupiers.The cities themselves will decide the details of the real estate levy. File photo taken on Apr. 23, 2010 shows residential areas in Shanghai, east China. The State Council, China's cabinet, has approved on a trial basis the launch of property tax reforms in some cities. Shanghai and Chongqing are cities that will trial the tax first. Shanghai sets its property tax rate at 0.4 to 0.6 percent. Municipalities impose property taxes on owners of real estate based upon the value of the property.Shanghai and Chongqing are cities that will trial the tax first.Shanghai set its property tax rate at 0.4 to 0.6 percent. Chongqing sets its at 0.5 to 1.2 percent. 

WASHINGTON, May 11 (Xinhua) -- Johns Hopkins University researchers have demonstrated that human liver cells derived from adult cells coaxed into an embryonic state can engraft and begin regenerating liver tissue in mice with chronic liver damage.The work, published Wednesday in the journal Science Translational Medicine, suggests that liver cells derived from so- called "induced-pluripotent stem cells (iPSCs)" could one day be used as an alternative to liver transplant in patients with serious liver diseases, bypassing long waiting lists for organs and concerns about immune system rejection of donated tissue."Our findings provide a foundation for producing functional liver cells for patients who suffer liver diseases and are in need of transplantation," says Yoon-Young Jang, assistant professor of oncology at the Johns Hopkins Kimmel Cancer Center. "iPSC-derived liver cells not only can be generated in large amounts, but also can be tailored to each patient, preventing immune-rejection problems associated with liver transplants from unmatched donors or embryonic stem cells." A microsopic view shows human embryonic stem cells in various stages of differentiation into liver cells in this photo taken at Stanford University and released by the California Institute for Regenerative Medicine, March 9, 2009iPSCs are made from adult cells that have been genetically reprogrammed to revert to an embryonic stem cell-like state, with the ability to transform into different cell types. Human iPSCs can be generated from various tissues, including skin, blood and liver cells.Although the liver can regenerate in the body, end-stage liver failure caused by diseases like cirrhosis and cancers eventually destroy the liver's regenerative ability, Jang says. Currently, the only option for those patients is to receive a liver organ or liver cell transplant, a supply problem given the severe shortage of donor liver tissue for transplantation. In addition, mature liver cells and adult liver stem cells are difficult to isolate or grow in the laboratory, she says. By contrast, iPSCs can be made from a tiny amount of many kinds of tissue; and the embryonic stem- like iPSCs can grow in laboratory cultures indefinitely.For the study, Jang and colleagues generated human iPSCs from a variety of adult human cells, including liver cells, fibroblasts ( connective tissue cells), bone marrow stem cells and skin cells. They found that though the iPSCs overall were molecularly similar to each other and to embryonic stem cells, they retained a distinct molecular "signature" inherited from the cell of origin.

BEIJING, March 15 (Xinhuanet) -- Chris Poole, the 22-year-old founder of 4Chan.org, criticized Facebook's approach and spoke up for online anonymity at South by Southwest Interactive in Austin, Texas, according to media reports Tuesday.Poole called out early in his keynote speech at the huge Austin tech event, referencing this Zuckerberg quote from David Kirkpatrick’s book "The Facebook Effect": "Having two identities for yourself is an example of a lack of integrity.""Anonymity is authenticity; it allows you to share in a completely unfiltered way," Poole countered. "It allows you to play in ways, you might not if people knew who you are.”Losing the ability to be anonymous on the Internet is, "a kind of loss of the innocence of youth," Poole said, crediting 4chan’s culture-infiltrating creativity to anonymity. "You can’t make mistakes,“ and then leave them behind, like the olds did pre-Facebook. If your mistakes ever made it to the Internet, they’re with you wherever you go.Poole — known by the 4chan handle "moot" — was to promote his new meme-generating venture, Canvas, still in beta testing.Launched for anime enthusiasts in 2003, 4chan is one of the most popular image-sharing bulletin boards on the Internet, with most of that traffic hitting 4chan’s notorious "random" image board, the /b/ board.

LUQA, Malta, Feb. 26 (Xinhua) -- A chartered plane of China Eastern Airlines carrying 272 Chinese evacuees from Libya left Malta for Shanghai on Saturday.The Airbus A330-300 plane took off at 8:20 p.m. local time ( 1920 GMT) from the Malta International Airport, to be followed shortly by another chartered plane of China Eastern Airlines with 278 Chinese evacuees on board.The 550-strong Chinese nationals from a Chinese construction company were among a total of 2,216 people who arrived by a ship from violence-torn Libya at the Grand Harbor in Valletta, capital of Malta, on Saturday.In addition to the 2,216 Chinese nationals, the ship chartered by the Chinese embassy in Malta also carried dozens of citizens of other countries.The vessel, which was the first Maltese ship chartered by the Chinese government to evacuate Chinese nationals, left Libya's Benghazi on Friday.Maltese Deputy Prime Minister and Foreign Minister Tonio Borg, who went aboard the ship, expressed gratitude to the Chinese government for helping to evacuate some Maltese nationals from Libya.Chinese Ambassador to Malta Zhang Keyuan also thanked the Maltese government for its cooperation in the evacuation of Chinese nationals.A 19-day-old baby was among the evacuated Chinese, said a source with the Chinese embassy.China Eastern Airlines will fly four planes every day to the Mediterranean island nation from Feb. 28 to March 10, as part of all-round airborne evacuation missions aimed at taking stranded Chinese citizens back home as soon as possible, according to information from an emergency meeting of the Civil Aviation Administration of China (CAAC) in Beijing on Saturday.

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