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MOSCOW, May 24 (Xinhua) -- Russia's Soyuz TMA-20 spacecraft with three crew members onboard has landed in Kazakhstan on Tuesday, said the Mission Control Center (MCC) outside Moscow.The spacecraft undocked from the International Space Station early Tuesday, carrying Russian cosmonaut Dmitry Kondratyev, European Space Agency (ESA) astronaut Paolo Nespoli and NASA astronaut Catherine Coleman back to Earth.According to the center, the Soyuz TMA-20 landed in the Kazakh steppe at 6:27 Moscow time (0227 GMT). Some 17 planes and helicopters and several rescue vehicles had conducted search works.Flight engineers Catherine "Cady" Coleman of the U.S. (L) and Italian Paolo Nespoli (R), and Russian cosmonaut and station commander Dmitry Kondratyev are seen after the Soyuz capsule landed, about 150 km (93 miles) southeast of the Kazakh town of Zhezkazgan May 24, 2011. A Russian Soyuz capsule delivered an international trio of astronauts back to Earth on Tuesday after six months on the International Space Station, parachuting through clear skies toward a safe landing on the Kazakh steppe.Deputy head of Federal Medical and Biological Agency Vyacheslav Rogozhkin said Italian astronaut Naspoli had some health problem after landing."Two crew members are fine, the third one has some problems with his vestibular system," Rogozhkin told a press conference after the landing.In December, the Soyuz TMA-20 was launched from the Kazakh Baikonur space center with three crew members.The next launch of manned spacecraft to the ISS was scheduled in early June.

WASHINGTON, April 3 (Xinhua) -- In the largest study of its kind, researchers from a consortium led by the University of Pennsylvania School of Medicine, the University of Miami, and the Boston University School of Medicine, identified four new genes linked to Alzheimer's disease. The findings appeared Sunday in the current issue of Nature Genetics.Each gene individually adds to the risk of having this common form of dementia later in life. These new genes offer a portal into what causes Alzheimer's disease and is a major advance in the field.The study, conducted by the Alzheimer's Disease Genetics Consortium, reports genetic analysis of more than 11,000 people with Alzheimer's disease and a nearly equal number of elderly people who have no symptoms of dementia. Three other consortia contributed confirming data from additional people, bringing the total number of people analyzed to over 54,000. The consortium also contributed to the identification of a fifth gene reported by other groups of investigators from the United States, the United Kingdom, France, and other European countries.The study is the result of a large collaborative effort with investigators from 44 universities and research institutions in the United States, led by Gerard Schellenberg at University of Pennsylvania."This is the culmination of years of work on Alzheimer's disease by a large number of scientists, yet it is just the beginning in defining how genes influence memory and intellectual function as we age. We are all tremendously excited by our progress so far, but much remains to be done, both in understanding the genetics and in defining how these genes influence the disease process," Schellenberg said.Until recently, only four genes associated with late-onset Alzheimer's have been confirmed, with the gene for apolipoprotein E-e4, APOE-e4, having the largest effect on risk. The Nature Genetics studies add another four -- MS4A, CD2AP, CD33, and EPHA1 -- and contribute to identifying and confirming two other genes, BIN1 and ABCA7, thereby doubling the number of genes known to contribute Alzheimer's disease.

MEXICO CITY, May 18 (Xinhua) -- The Mexican government signed an agreement with the non-governmental group TRAFFIC on Tuesday to exchange information about illegal seizures of flora and fauna species in Mexico.The agreement with the wildlife trade monitoring network also called for the Mexican government to provide information on the routes used to transport such organic materials.The agreement was signed on the sideline of the 16th meeting of the Trilateral Committee for Wildlife and Ecosystem Conservation Management in the city of Oaxaca, south Mexico. Representatives of Canada, the United States and Mexico also attended the meeting.Among the list of 20,000 animals, vegetation and insects that TRAFFIC considers to be threatened by illegal trafficking worldwide, 2,500 of the organisms have their origins in Mexico. This amounts to 12 percent of the species most subject to buying, selling and transporting in the black market and threatens the survival of various ecosystems.The Mexican species that are listed among the most threatened by illegal trafficking are the cactus, orchids, reptiles, maguey plants, ferns, amphibians and fish.

WASHINGTON, Jan. 20 (Xinhua) -- Officials from China and the United States on Thursday signed a new agreement to support panda breeding, research and conservation efforts by the two countries, an exciting news for numerous American fans of the cute animals.Zang Chunlin, Secretary General of the China Wildlife Conservation Association, and Dennis Kelly, Director of the U.S. Smithsonian's National Zoo, signed the Giant Panda Cooperative Research and Breeding Agreement.Under the agreement, a pair of giant pandas, Mei Xiang and Tian Tian, will remain at the National Zoo in Washington D.C. for five more years.Also in attendance at the signing ceremony at the National Zoo was Chen Naiqing, wife of China's Ambassador to the U.S. Zhang Yesui, U.S. Secretary of the Interior Ken Salazar and Mary Kaye Huntsman, wife of U.S. Ambassador to China Jon Huntsman.On behalf of the Chinese embassy and Ambassador Zhang, Chen expressed appreciation to the National Zoo for taking care of these giant pandas and to all American people for their love for them."Although the weather is cold today, the friendship between our people keeps us warm," she said. "I am confident that through joint efforts, our cooperation will grow, our friendship will deepen, and the future will be even brighter."The first two years of the new agreement, effective immediately through Dec. 5, 2015, include a cooperative study involving reproductive experts from the China Conservation and Research Center for the Giant Panda in Wolong and the Smithsonian's Conservation Biology Institute to oversee the breeding of Mei Xiang and Tian Tian."I am proud that this agreement not only ensures that visitors to the zoo will continue to be able to visit and learn about these beautiful animals, but also provides a strong platform for improving the conservation of wild pandas and their habitat in China," said Salazar.He said those giant pandas have "long symbolized the close partnership the United States has with China as we work together to conserve and recover one of the world's most endangered species in the wild."Mei Xiang and Tian Tian have lived at the Smithsonian's National Zoo since Dec. 6, 2000. Both pandas were born in Wolong, China and had parents that were wild born. Mei Xiang, which means "beautiful fragrance," will turn 13 on July 22 and Tian Tian, meaning "more and more," will turn 14 on Aug. 27.The current pair has not produced a cub since 2005, when Tai Shan, a male, was born. Tai Shan went back to China in February, 2010.

WASHINGTON, May 17 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) announced Tuesday that the international Aquarius/SAC-D observatory will be launched on June 9, to study interactions between ocean circulation, the water cycle and climate by measuring ocean surface salinity.Engineers at Vandenberg Air Force Base in California are performing final tests before mating the satellite to its Delta II rocket. The mission is a collaboration between NASA and Argentina' s space agency, with participation from Brazil, Canada, France and Italy.In addition to Aquarius, the primary instrument, the observatory carries seven other instruments that will collect environmental data for a wide range of applications, including studies of natural hazards, air quality, land processes and epidemiology.The mission will make NASA's first space observations of the concentration of dissolved salt at the ocean surface. Aquarius' observations will reveal how salinity variations influence ocean circulation, trace the path of freshwater around our planet, and help drive Earth's climate. The ocean surface constantly exchanges water and heat with Earth's atmosphere. Approximately 80 percent of the global water cycle that moves freshwater from the ocean to the atmosphere to the land and back to the ocean happens over the ocean.Salinity plays a key role in these exchanges. By tracking changes in ocean surface salinity, Aquarius will monitor variations in the water cycle caused by evaporation and precipitation over the ocean, river runoff, the freezing and melting of sea ice. Salinity also makes seawater denser, causing it to sink, where it becomes part of deep, interconnected ocean currents. This deep ocean "conveyor belt" moves water masses and heat from the tropics to the polar regions, helping to regulate Earth's climate."Salinity is the glue that bonds two major components of Earth' s complex climate system: ocean circulation and the global water cycle," said Aquarius Principal Investigator Gary Lagerloef of Earth & Space Research in Seattle in a statement. "Aquarius will map global variations in salinity in unprecedented detail, leading to new discoveries that will improve our ability to predict future climate."Aquarius will measure salinity by sensing microwave emissions from the water's surface with a radiometer instrument. These emissions can be used to indicate the saltiness of the surface water, after accounting for other environmental factors. Salinity levels in the open ocean vary by only about five parts per thousand, and small changes are important. Aquarius uses advanced technologies to detect changes in salinity as small as about two parts per 10,000, equivalent to a pinch (about one-eighth of a teaspoon) of salt in a gallon of water.Aquarius will map the entire open ocean every seven days for at least three years from 408 miles (657 kilometers) above Earth. Its measurements will produce monthly estimates of ocean surface salinity with a spatial resolution of 93 miles (150 kilometers). The data will reveal how salinity changes over time and from one part of the ocean to another.

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