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HOUSTON, April 15 (Xinhua) -- A major contractor for the U.S. space shuttle on Friday announced plans to lay off about 50 percent of its employees this summer after NASA retires the orbiter fleet.The contractor, Houston-based United Space Alliance, said it will cut 2,600 to 2,800 jobs, including 1,850 to 1,950 employees in Florida, 750 to 800 employees in Texas, and 30 to 40 employees in Alabama, "due to the completion of tasks related to day-to-day operations of the Shuttle fleet."The cuts will be made in late July and early August after NASA completes the final flight of Endeavour, scheduled for April 29, and the flight of Atlantis on June 28."The accomplishments of this team are unmatched in human spaceflight," Virginia Barnes, the company's president, said in a news release. "It will be difficult to say goodbye to such tremendously talented and dedicated teammates, and we are committed to making this transition as smooth as possible for them."United Space Alliance has approximately 5,600 employees working at sites in Texas, Florida and Alabama, according to the the news release.

CARACAS, March 30 (Xinhua) -- The number of confirmed cases of the A/H1N1 influenza in Venezuela has risen to 482 this year, Health Minister Eugenia Sader said on Wednesday.According to the latest report, the state of Merida in southeastern Venezuela has 189 A/H1N1 influenza cases, the biggest number ever reported, which was followed by the Capital District of Caracas with 112 cases. The other 181 cases were confirmed in 17 of 24 Venezuelan states.The first case for this year was reported in Merida earlier this month.Sader said that the Venezuelan government was trying to prevent the spread of the disease. Some 3 million people have been vaccinated against the virus.Three patients infected with the A/H1N1 influenza virus have died in the country this year, according to Sader.The A/H1N1 influenza can cause deadly pneumonia if it is not treated early.

LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.

BEIJING, May 16 (Xinhuanet) -- NASA is close to deciding on a landing site for its Mars rover Curiosity mission by narrowing the choices to four, media reports said Monday.Scientists in the close-knit Mars research community get one last chance to make their case this week when they gather before the "judges" — the team running the 2.5 billion U.S. dollar mission that will soon suggest a landing site to NASA, the ultimate decider."All four of these places are compelling places on Mars to study. There's not a loser among them," said landing site scientist Matt Golombek of the NASA Jet Propulsion Laboratory, one of the meeting's leaders.The mission will use rover Curiosity to study whether a selected area will have environmental conditions suitable for life and for preserving evidence about whether extraterrestial life has existed.Being nuclear-powered, the rover cannot go to a location that has either water or ice within one meter of the surface.The size of a mini Cooper, Curiosity is scheduled to launch in late November after a two-year delay.

BEIJING, Feb.9 (Xinhua) -- China's State Council, the nation's cabinet, pledged Wednesday to step up efforts to boost grain production as relentless droughts continue to wreak havoc in north China's wheat growing regions.To encourage farmers to plant more and increase production, China will increase minimum purchase prices for grain produced in 2011 by up to 21.9 percent from that in 2010, according to a statement released after a State Council executive meeting presided over by Premier Wen Jiabao.The purchasing prices for japonica rice will rise 21.9 percent to 128 yuan (19.4 U.S. dollars) per 50 kilograms this year, while prices for early and middle-late indica rice will increase 9.7 percent and 10.3 percent to 102 yuan and 107 yuan per 50 kilograms respectively.Further, the central government will allocate 1.2 billion yuan to subsidize the purchase of anti-drought technologies for winter wheat-growing regions.According to the statement, the government has already allocated 4 billion yuan for rural water conservation projects and another 2 billion yuan will be allocated for farm irrigation systems and safe drinking water projects.The government had also pledged to fund 2,000 professional groups in insect-prevention in the worst-hit counties, the statement said.China's main wheat-growing regions, including Shandong, Henan, Hebei, Anhui, Shanxi, Shaanxi, Gansu and Jiangsu provinces, have been plagued by ongoing droughts since last year.