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BEIJING, Aug. 22 (Xinhuanet) -- U.S. presidential candidate Rick Perry's controversial stem-cell treatment may inspire desperate patients to follow his lead while causing medical and legal concerns, according to media reports Monday.The Texas governor underwent a procedure on July 1 where stem cells, made from fat taken from his body, were put into his bloodstream to see if they might find their way to fix a bad back.The treatment carries potential risks ranging from blood clots to infection to cancer and may even run afoul of federal rules, doctors say. File photo of U.S. Republican presidential candidate Texas Governor Rick Perry."As a highly influential person of power, Perry’s actions have the unfortunate potential to push desperate patients into the clinic of quacks,” Harvard’s stem cell expert George Daley told the Associated Press.Worries about the safety and wisdom of this treatment are widespread among stem cell researchers as such a treatment has not been thoroughly vetted by researchers or approved by the FDA.

WASHINGTON, July 7 (Xinhua) -- Space shuttle Atlantis will soar into the sky Friday on NASA's 135th and final flight. Its scheduled return to Earth later this month will mark the end of NASA's 30-year space program.Since its onset with the launch of space shuttle Columbia, the program has been seen as a cheap, safe and reliable way for space exploration.Despite its great contributions to U.S. manned space flight, it has also left some grave and tragic lessons, making its termination inevitable.HIKING COSTSLaunched in 1972 by then President Richard Nixon, the shuttle program aimed to provide a new system of affordable space travel and proved to be NASA's most enduring project in its 50 years of existence.In 1981, shuttle Columbia made its first shuttle flight for two days. It was the ultimate hybrid and the first reusable spacecraft.Launched like a rocket and gliding back to Earth like an airplane, space shuttles not only can act as a space taxi to carry astronauts, but have the muscle of a long-distance trucker to haul heavy machinery.The spaceship boasts more than 3,500 subsystems and 2.5 million parts and is nine times faster than a speeding bullet as it climbs heavenward. That versatility, however, has translated into higher costs.NASA originally estimated the program would cost about 90 billion U.S. dollars. However, its actual cost stands at about 200 billion dollars, compared with the 151 billion dollars spent on Apollo which took Americans to the moon in 1969.In an article in Technology Review, John Logsdon, former head of the Space Policy Institute at George Washington University, drew a direct connection between the ravenous shuttle budget and the lack of other large advances in manned space flight."By operating the system for 30 years, with its high costs and high risk, rather than replacing it with a less expensive, less risky second-generation system, NASA compounded the original mistake of developing the most ambitious version of the vehicle," he wrote."The shuttle's cost has been an obstacle to NASA starting other major projects," he added.HIGH RISKIn terms of safety, the shuttles have never been as reliable as their designers had envisioned.On average, one out of every 67 flights ended up with fatal accidents. Based on the rate of deaths per million miles traveled, the space shuttle is 138 times riskier than a passenger jet.Seven astronauts onboard died when Challenger exploded about a minute after launch in 1986. Nearly two decades after the tragic blast, a new catastrophe descended when the shuttle Columbia disintegrated moments before landing in 2003, killing another seven spacemen.Again, the shuttle program was shelved for more than two years as NASA stepped up efforts to make it safer. But experts say the fundamental problem related to shuttles' safety cannot be solved due to their "birth defects.""It is in the nation's interest to replace the Shuttle as soon as possible," concluded the panel that investigated the 2003 Columbia accident.

LOS ANGELES, July 19 (Xinhua) -- Obesity prevalence was 30 percent or higher in 12 states of the United States last year, compared to nine states in 2009, the Centers for Disease Control and Prevention (CDC) said on Tuesday.In 2000, no states in the country had obesity rates that high, and now obesity is a problem in all 50 states, the agency said in a report based on telephone interviews with 400,000 people.Obesity rates vary by region, led by the South at 29.4 percent, followed by the Midwest at 28.7 percent, the Northeast at 24.9 percent, and the West at 24.1 percent, the report said.Mississippi had the nation's highest obesity prevalence at 34 percent, and Colorado the lowest at 21 percent, according to the report.Alabama, Arkansas, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Oklahoma, South Carolina, Tennessee, Texas, and West Virginia all had obesity rates of 30 percent or higher in 2010, said the report.No state met the federal Healthy People 2010 goal of a 15 percent obesity rate. In fact, no state had a rate lower than 20 percent, the CDC said.Obesity rates have kept rising despite a steady drumbeat of warnings that obesity causes serious health problems and increases the risk of premature death, CDC officials said.An adult is considered obese if he or she has a body mass index (BMI) of 30 or greater.

BEIJING, Sept. 18 (Xinhua) -- No newly-formed oil belt was detected in the past two days in north China's Bohai Bay from ConocoPhillips' platforms in the Penglai 19-3 oilfield, the State Oceanic Administration (SOA) said.However, new spots of visible oil spills could still be found around platform C, the SOA said in a statement on Sunday.It is estimated that about 4.51 liters of oil leaked into the sea on Saturday, a slight drop from 6.56 liters from Thursday.No oil clean-up work was done on Friday and Saturday due to the strong winds and rough conditions at sea, the statement said.ConocoPhillips China, a subsidiary of U.S. energy giant ConocoPhillips, first reported spills to authorities in June. The oil spills have polluted more than 5,500 square km of sea water in the Bohai Bay since June.The oil spills have spread to beaches in Hebei and Liaoning provinces. The spills have been blamed for losses in the provinces' tourism and aquatic farming industries.The company on Aug. 31 submitted a report to the SOA claiming that it had screened out all potential sources for oil spills and blocked all oil leaks.After days of evaluation, however, the SOA said on Sept. 2 that ConocoPhillips had failed to complete the clean-up.

BEIJING, Sept. 6 (Xinhuanet) -- Scientists from Tufts University of the U.S. have created the world's smallest electrical motor in a single molecule.The finding was published in the journal Nature Nanotechnology on Monday.In the research, scientist successfully made a single molecule accept an electrical charge and rotate as fast as 120 revolutions per second."This is the first time that electrically-driven molecular motors have been demonstrated, despite a few theoretical proposals," said Charles H. Sykes, professor of chemistry at Tufts who led the team.The single molecule electric motor could lead to new types of electrical circuitry, giving hope for scientists to apply it in medicine and engineering, he said."The next thing to do is to couple it to other molecules, lining them up next to one another so they're like miniature cog-wheels, and then watch the rotation propagation down the chain," said Sykes.