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LOS ANGELES, May 12 (Xinhua) -- A subsurface ocean of molten or partially molten magma exists beneath the surface of Jupiter's volcanic moon Io, the Jet Propulsion Laboratory (JPL) said on Thursday."The finding heralds the first direct confirmation of this kind of magma layer at Io and explains why the moon is the most volcanic object known in the solar system," JPL said in a press release posted on its website.The finding was based on new data analysis from NASA's Galileo spacecraft, said JPL.The research was conducted by scientists at the University of California, Los Angeles; the University of California, Santa Cruz;, and the University of Michigan, Ann Arbor. The study is published this week in the journal Science, JPL said."Scientists are excited we finally understand where Io's magma is coming from and have an explanation for some of the mysterious signatures we saw in some of the Galileo's magnetic field data," said Krishan Khurana, lead author of the study and former co- investigator on Galileo's magnetometer team at UCLA."It turns out Io was continually giving off a 'sounding signal' in Jupiter's rotating magnetic field that matched what would be expected from molten or partially molten rocks deep beneath the surface."Io produces about 100 times more lava each year than all the volcanoes on Earth, according to data released by JPL in Pasadena, Los Angeles.While Earth's volcanoes occur in localized hotspots like the "Ring of Fire" around the Pacific Ocean, Io's volcanoes are distributed all over its surface, JPL said, adding that a global magma ocean about 30 to 50 km beneath Io's crust helps explain the moon's activity."It has been suggested that both the Earth and its moon may have had similar magma oceans billions of years ago at the time of their formation, but they have long since cooled," said Torrence Johnson, a former Galileo project scientist based at JPL, an affiliation with NASA."Io's volcanism informs us how volcanoes work and provides a window in time to styles of volcanic activity that may have occurred on the Earth and moon during their earliest history," said Johnson, who was not directly involved in the study.NASA's Voyager spacecraft discovered Io's volcanoes in 1979, making that moon the only body in the solar system other than Earth known to have active magma volcanoes. The energy for the volcanic activity comes from the squeezing and stretching of the moon by Jupiter's gravity as Io orbits the largest planet in the solar system.Galileo was launched in 1989 and began orbiting Jupiter in 1995. Unexplained signatures appeared in magnetic field data from Galileo flybys of Io in October 1999 and February 2000. After a successful mission, the spacecraft was intentionally sent into Jupiter's atmosphere in 2003.

BEIJING, Feb. 8 (Xinhua) -- As the Chinese Lunar New Year hoilday ended Tuesday, waves of Chinese residents began their journey back to work, as they boarded trains, airplanes and buses.The China Meteorological Administration announced Tuesday that a cold front would cause temperatures to fall by 4 to 12 degrees Celsius in most parts of the country, while some areas in the northwest, north and southwest will see rainfall or snow from Wednesday to Friday.Fleets of motorbikes carrying thousands of migrant workers passed through national roads again on Tuesday.The Ministry of Public Security said it set up 8,300 service stations along the country's major highways to provide free food, medicine, and rest stops for motor-riding migrant workers. The stations also sent police cars to clear the way for large groups of motorists.Chen Tianchong, a migrant worker from Muge County, Guigang City of southwest China' s Guangxi Zhuang Autonomous Region and 38 of his fellow migrant worker started their journey on motorcycles at 4:30 a.m. on the foggy National Road 324, which is a 2,712-kilometer road linking five provinces of Fujian, Guangdong, Guangxi, Guizhou and Yunan in southern China.A motorcycle usually carried two people, often a couple, sometimes with a child sandwiched in between. They would wrap themselves in thick outerwear to battle the cold weather at night. Limited access to cheap public transportation had forced many migrant workers to make their trips home on their own."I promised my boss that I would go back to the factory in Guangdong before Wednesday," said Chen.Chen said that they might arrive at Dali County, Shunde City of south China's Guangdong Province around eleven at night, after more than 18 hours riding a motorcycle from their hometown. By this way, each family may save more than 1,000 yuan - half of their monthly income.Zhong Fei, another migrant worker also from Guangxi, chose this way home during the Spring Festival for the past three years. Zhong told Xinhua that earning money for his family was the most important thing and the exhausting trip was nothing.From Guangdong alone, one of China's manufacturing bases, over 100,000 migrant workers left for home on motorbikes, said the local police. The Spring Festival travel rush started in China in the late 1980s, when millions of farmers from inland China moved to coastal cities to work.In spite the increasing popularity of motor cycles, the majority of Chinese travelers still prefer trains or buses. Shandong province embraced the post-holiday passenger rush Tuesday, with railway stations witnessing 200,000 passengers in a single day.Highway toll booths near Beijing, Shanghai, Tianjin and other big cities in China have become clogged.Passengers are also snapping up airplane tickets. China Southern Airlines had increased flights from 30 to 70 flights per day.Official forecasts indicate that this year's Spring Festival holiday may see a record 2.85 billion passenger trips nationwide, as Chinese workers return home from across the country for family reunions and go back to work after the holidays.

BEIJING, Jan. 31 (Xinhua) -- Senior Chinese leader Li Changchun Monday visited performers and producers of China Central Television's Spring Festival gala during their rehearsal.Li, a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee, extended new year greetings to the crew.Li Changchun (front R), a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee, shakes hands with actors at the rehearsal of the Spring Festival Gala Evening at China Central Television (CCTV) in Beijing, China, Jan. 31, 2011. He hoped an excellent show will be presented on the eve of the Spring Festival, or Lunar New Year, which falls on Feb. 3.The annual Lunar New Year gala celebration started in the 1980s. Since then, it has been the most popular TV event, attracting a major portion of China's 1.3 billion population each year.

WASHINGTON, March 22 (Xinhua) -- A long-term study by Greek researchers has shown the effectiveness of replacing bone marrow, purposely destroyed by chemotherapy, with autologous (self) stem cells in treating people with aggressive forms of multiple sclerosis (MS).The study was published on Tuesday in Neurology, the medical journal of the American Academy of Neurology.For the treatment, chemotherapy drugs are used to kill all of the patient's blood cells, including the immune cells that are believed to be attacking the body's own central nervous system. Bone marrow stem cells removed from the patient are purified and transplanted back into the body, which saves life by replacing the blood cells and also is proposed to "reboot" the immune system.A human embryonic stem cell line derived at Stanford University is seen in this handout photo released to Reuters by the California Institute for Regenerative Medicine, March 9, 2009The study followed 35 people for an average of 11 years after transplant. The study involved people with rapidly progressive MS who had tried a number of other treatments for MS with little or no effect. All were severely disabled by the disease, with an average score of six on a scale of disease activity that ranges from zero being a normal neurological examination to 10 meaning death due to MS.A score of six means able to walk with a cane or crutch; a seven is mainly in a wheelchair. All had worsened by at least one point on the scale in the year prior to the transplant.After the transplants, the probability of participants having no worsening of their disease for 15 years was 25 percent. The probability was higher -- 44 percent -- for those who had active brain lesions, which are a sign of disease activity, at the time of the transplant.For 16 people, symptoms improved by an average of one point on the scale after the transplant, and the improvements lasted for an average of two years. The participants also had a reduction in the number and size of lesions in their brains. Two people (six percent) died from complications related to the transplant at two months and 2-1/2 years post-transplant.Study author Vasilios Kimiskidis, of Aristotle University in Thessaloniki, Greece, noted that more research is needed on this treatment, including studies that compare people receiving the treatment to a control group that does not receive the treatment."Keeping that in mind, our feeling is that stem cell transplants may benefit people with rapidly progressive MS," he said. "This is not a therapy for the general population of people with MS but should be reserved for aggressive cases that are still in the inflammatory phase of the disease."