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CHICAGO, Jan. 21 (Xinhua) -- Chinese President Hu Jintao left Chicago for home on Friday after concluding a four-day state visit to the United States, during which Hu and his U.S. counterpart Barack Obama agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit.President Hu, who began his visit on Tuesday, had extensive and in-depth discussions with Obama at the White House on Wednesday on major bilateral, regional and world issues.The two sides reached "important agreement on China-U.S. relations and major international and regional issues of shared interest," the Chinese president said when he and Obama met the press following their discussions."We both agree to further push forward the positive, cooperative and comprehensive China-U.S. relationship," Hu said, adding that both sides also pledged to forge "a China-U.S. cooperative partnership based on mutual respect and mutual benefit" for the benefit of the two countries and beyond.The Chinese president said he and Obama also discussed some disagreements in the economic and trade area, with both sides pledging "to continue to appropriately resolve these according to the principle of mutual respect and consultation on an equal footing."Also on Wednesday, Hu attended a state dinner and a welcome ceremony hosted by Obama.Hu told the Americans on several occasions in Washington that the purpose of his visit to the United States was "to increase mutual trust, enhance friendship, deepen cooperation and advance the positive, cooperative and comprehensive China-U.S. relationship for the 21st century."During Hu's visit, the two countries issued the "China-U.S. Joint Statement," which says "China and the United States committed to work together to build a cooperative partnership based on mutual respect and mutual benefit in order to promote the common interests of both countries and to address the 21st century's opportunities and challenges.""China and the United States are actively cooperating on a wide range of security, economic, social, energy, and environmental issues which require deeper bilateral engagement and coordination," the statement said.On Thursday, Hu called upon the U.S. Congress to continue helping the two countries boost their relations.Pursuing a healthy and steady development of China-U.S. ties is China's established policy and strategic choice, Hu stressed when meeting House Speaker John Boehner and Senate Majority Leader Harry Reid.Also on Thursday in Washington, Hu delivered an important speech at the welcome luncheon hosted by friendly organizations in the United States.To advance the sustained, sound and steady development of China-U.S. relations serves the fundamental interests of peoples of China and the United States, he said.

WASHINGTON, April 13 (Xinhua) -- The U.S. Food and Drug Administration (FDA) announced on Wednesday that it has approved the cPAX Aneurysm Treatment System for surgery on brain aneurysms that are difficult to manage because of their size and shape.An aneurysm is a bulge in the wall of a blood vessel, which can rupture as it increases in size, causing hemorrhage or death. Brain aneurysms often produce no symptoms until they grow and press on nerves in the brain, or until they begin to leak blood or rupture.Aneurysms can be repaired in two ways: surgeons can close the base of the aneurysm with a surgical clip, or use a technique commonly known as coiling, in which surgeons use a catheter to thread metallic coils through a blood vessel in the groin and into the blood vessel in the brain that contains the aneurysm. Surgeons then fill the aneurysm with the detachable coils, which block it from circulation and cause blood to clot, effectively destroying the aneurysm.Aneurysms larger than 10 millimeters are difficult to treat with clipping or coiling. The cPAX device system is indicated for use in those brain aneurysms."Like coiling, the cPAX Aneurysm Treatment System is a form of endovascular repair," said Christy Foreman, director of the Office of Device Evaluation in the FDA's Center for Devices and Radiological Health. "But instead of tiny metallic coils, it uses a special polymer material to fill the space within the aneurysm."According to the FDA, the cPAX device system is indicated for use in adults aged 22 and older and should not be used in patients with an active infection or in those in whom anticoagulation and antiplatelet therapy is contraindicated.

WASHINGTON, April 19 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) on Tuesday set April 29 as the launch date for Endeavour's final voyage.The date was announced Tuesday at the conclusion of a flight readiness review at Kennedy Space Center. During the meeting, senior NASA and contractor managers assessed the risks associated with the mission and determined the shuttle and station's equipment, support systems and personnel are ready.Liftoff time is 3:47 p.m. EDT (1947 GMT). It will be the 134th shuttle mission overall, the 25th for Endeavour and the 36th shuttle mission to the International Space Station.Endeavour will deliver to the station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer.Space shuttle Endeavour sits on launch pad 39A with the crew aboard minutes before mission managers scrubbed the launch again at Cape Canaveral, Florida, July 13, 2009.The spectrometer, also designated AMS-02, is a particle physics experiment module that is to be mounted on the station. It is designed to search for various types of unusual matter by measuring cosmic rays. Its experiments will help researchers study the formation of the Universe and search for evidence of dark matter and antimatter.Endeavour's two-week mission was led by Commander Mark Kelly. Other crew include Pilot Greg Johnson, NASA Mission Specialists Michael Fincke, Andrew Feustel and Greg Chamitoff and European Space Agency Mission Specialist Roberto Vittori. Astronauts are planning to step out on four spacewalks to do maintenance work and install new components.NASA's 30-year-old shuttle program is ending this year 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.Shuttle Atlantis is set for its final journey into space at the end of June. Its return to earth will mark the official end of the U.S. space shuttle program. After that, the Russian space program' s Soyuz capsule will be the only method for transporting astronauts to and from the station.

WASHINGTON, May 2 (Xinhua) -- Rice originated in China, a team of U.S. genome researchers has concluded in a study tracing back thousands of years of evolutionary history through large-scale gene re-sequencing.Their findings, which appear Monday in the latest issue of the Proceedings of the National Academy of Sciences (PNAS), indicate that domesticated rice may have first appeared as far back as approximately 9,000 years ago in the Yangtze Valley of China. Previous research suggested domesticated rice may have two points of origin -- India as well as China.Asian rice, Oryza sativa, is one of world's oldest crop species. It is also a very diverse crop, with tens of thousands of varieties known throughout the world. Two major subspecies of rice -- japonica and indica -- represent most of the world's varieties. Sushi rice, for example, is a type of japonica, while most of the long-grain rice in risottos are indica.Because rice is so diverse, its origins have been the subject of scientific debate. One theory -- a single-origin model -- suggests that indica and japonica were domesticated once from the wild rice O. rufipogon.Another -- a multiple-origin model -- proposes that these two major rice types were domesticated separately and in different parts of Asia. The multiple-origin model has gained currency in recent years as biologists have observed significant genetic differences between indica and japonica, and several studies examining the evolutionary relationships among rice varieties supported more than domestication in both India and China.In the PNAS study, the researchers re-assessed the evolutionary history, or phylogeny, of domesticated rice using previously published datasets, some of which have been used to argue that indica and japonica rice have separate origins. Using more modern computer algorithms, however, the researchers concluded these two species have the same origin because they have a closer genetic relationship to each other than to any wild rice species found in either India or China.In addition, the study's authors examined the phylogeny of domesticated rice by re-sequencing 630 gene fragments on selected chromosomes from a diverse set of wild and domesticated rice varieties. Using new modeling techniques, which had previously been used to look at genomic data in human evolution, their results showed that the gene sequence data was more consistent with a single origin of rice.In the study, the investigators also used a "molecular clock" of rice genes to see when rice evolved. Depending on how the researchers calibrated their clock, they pinpointed the origin of rice at possibly 8,200 years ago, while japonica and indica split apart from each other about 3,900 years ago. The study's authors pointed out that these molecular dates were consistent with archaeological studies.Archaeologists have uncovered evidence in the last decade for rice domestication in the Yangtze Valley beginning approximately 8, 000 to 9,000 years ago while domestication of rice in the India's Ganges region was around about 4,000 years ago."As rice was brought in from China to India by traders and migrant farmers, it likely hybridized extensively with local wild rice," explained New York University biologist Michael Purugganan, one of the study's co-authors. "So domesticated rice that we may have once thought originated in India actually has its beginnings in China."

BEIJING, Feb. 14 (Xinhua) -- Chinese President Hu Jintao met with delegates from the national Party building society here Monday.Vice president Xi Jinping and He Guoqiang, secretary of the Central Commission for Discipline Inspection (CCDI) of the Communist Party of China (CPC), were also present at the occasion in the Great Hall of the People.The delegates were here to attend the fifth national congress of the national Party building society which was established in 1992.Addressing the meeting Monday, Li Yuanchao, head of the Organization Department of the CPC Central Committee, called on all the party building research staff to keep focusing on their study and be innovative in thinking about party building theory so as to strengthen party building in a more scientific way.The society revised its constitution and re-elected members of its council at Monday's meeting.

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