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WASHINGTON, May 20 (Xinhua) -- Two U.S. astronauts conducted the first of four spacewalks for space shuttle Endeavour's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) said.According to the U.S. space agency, Endeavour's mission specialists Andrew Feustel and Greg Chamitoff completed the six-hour, 19-minute spacewalk at 9:29 a.m. EDT (1329 GMT). They successfully installed antennas for the External Wireless Communication system, routing cables, setting up the antenna, installing handrails, and connecting power cables.Because of a carbon dioxide sensor failure in Chamitoff's spacesuit, flight controllers limited his spacewalk time to about six hours 20 minutes, 10 minutes less than the planned six hours and 30 minutes. There was no indication his suit's carbon dioxide levels would rise. However, they deferred tasks to remove a micrometeoroid debris shield to access and attach some of the connection points.This was the 245th spacewalk conducted by U.S. astronauts. It was Feustel's fourth spacewalk for a total time of 27 hours and 17 minutes, and Chamitoff's first.Endeavour lifted off on Monday morning from Kennedy Space Center in Florida, to deliver to the International Space Station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer (AMS).AMS, a particle physics detector, is designed to search for various types of unusual matter by measuring cosmic rays. Its experiments are designed to help researchers study the formation of the universe and search for evidence of dark matter, strange matter and antimatter.

WASHINGTON, May 3 (Xinhua) -- People diagnosed with asthma in the United States grew by 4.3 million between 2001 and 2009, according to a new report released Tuesday by the Centers for Disease Control and Prevention (CDC).In 2009, nearly one in 12 Americans were diagnosed with asthma. In addition to increased diagnoses, asthma costs grew from about 53 billion U.S. dollars in 2002 to about 56 billion dollars in 2007, about a six percent increase. The explanation for the growth in asthma rates is unknown, according to the CDC.Asthma is a lifelong disease that causes wheezing, breathlessness, chest tightness, and coughing, though people with asthma can control symptoms and prevent asthma attacks by avoiding things that can set off an asthma attacks, and correctly using prescribed medicine, like inhaled corticosteroids. The report highlights the benefits of essential asthma education and services that reduce the impact of these triggers, but most often these benefits are not covered by health insurers."Despite the fact that outdoor air quality has improved, we've reduced two common asthma triggers -- secondhand smoke and smoking in general -- asthma is increasing," said Paul Garbe, chief of CDC 's Air Pollution and Respiratory Health Branch. "While we don't know the cause of the increase, our top priority is getting people to manage their symptoms better."Asthma triggers are usually environmental and can be found at school, work, home, outdoors, and elsewhere and can include tobacco smoke, mold, outdoor air pollution, and infections linked to influenza, cold-like symptoms, and other viruses.According to the report, asthma diagnoses increased among all demographic groups between 2001 and 2009, though a higher percentage of children reported having asthma than adults (9.6 percent compared to 7.7 percent in 2009). Annual asthma costs in the United States were 3,300 dollars per person with asthma from 2002 to 2007 in medical expenses. About two in five uninsured and one in nine insured people with asthma could not afford their prescription medication."Asthma is a serious, lifelong disease that unfortunately kills thousands of people each year and adds billions to our nation's health care costs," said CDC Director Thomas Frieden. "We have to do a better job educating people about managing their symptoms and how to correctly use medicines to control asthma so they can live longer more productive lives while saving health care costs."

BEIJING, Feb. 16 (Xinhua) -- China's police forces have formed a nationwide computerized network to share information about fugitives, fingerprints, stolen vehicles and other crimes.Sources with the Ministry of Public Security said Wednesday that almost all police officers throughout the country have access to the network, including those in border checkpoints and exit-entry administrations.The network can verify the identification cards of Chinese citizens and help the police with anti-terrorism and anti-drug operations, a statement released by the ministry said.The Public Security Ministry is working with other government agencies such as the ministries of national security and foreign affairs, the central bank and civil aviation administration to share information from the network.

LOS ANGELES, May 25 (Xinhua) -- NASA project managers bade farewell to the Mars rover Spirit on Wednesday after sending a final set of commands to the stranded vehicle.This marks the completion of one of the most successful missions of interplanetary exploration ever launched, NASA's Jet Propulsion Laboratory (JPL) said."Last night, just after midnight, the last recovery command was sent to Spirit," said John Callas, the Mars Exploration Rover Project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Los Angeles."It would be an understatement to say this was a significant moment. Since the last communication from Spirit on March 22, 2010, as she entered her fourth Martian winter, nothing has been heard from her."NASA has tried in vain to regain communication with Spirit since it got stuck in sand about two years ago. The rover last communicated on March 22, 2010, as Martian winter approached and the rover's solar-energy supply declined.NASA checked frequently in recent months for possible reawakening of Spirit as solar energy available to the rover increased during Martian spring, but to no avail.A series of additional re-contact attempts ended on Wednesday, designed for various possible combinations of recoverable conditions, according to JPL."Our job was to wear these rovers out exploring, to leave no unutilized capability on the surface of Mars, and for Spirit, we have done that," said Callas.

LOS ANGELES, April 2 (Xinhua) -- The United States could soon be faced with an epidemic of Non-Alcoholic Fatty Liver Disease ( NAFLD), one of the major contributing factors of chronic liver disease (CLD), the American Association for the Advancement of Science (AAAS) reported Saturday.If the current rates of obesity and diabetes continue for another two decades, the prevalence of NAFLD in the U.S. is expected to increase by 50 percent in 2030, AAAS said.The prediction is based on pre-existing clinical survey data over a 10 year period (1988-1994, 1999-2004 and 2005-2008), which included 39,500 adults from three survey cycles, according to the AAAS.Over the three cycles, the prevalence of NAFLD doubled from 5. 51 percent to 11 percent respectively. Furthermore, during the first survey cycle (1988-1994) 46.8 percent of all CLD's was related to NAFLD but by 2005-2008 this had increased to 75.1 percent. In addition, the prevalence of obesity and diabetes, the two key risk factors for NAFLD also steadily increased."If the obesity epidemic is anything to go by, the U.S. NAFLD epidemic may have a ripple effect worldwide," said Mark Thursz, Vice Secretary of the European Association for the Study of the Liver. "It is imperative that health systems continue to drive effective educational programs to reinforce awareness among the general public to alert them of the risks of obesity and promote the importance of diet and exercise."Non-alcoholic fatty liver disease is fast becoming one of the top concerns for clinicians due to the obesity epidemic and it's potential to progress to advanced liver disease which significantly impacts on overall liver-related mortality, Thursz said in remarks published by AAAS' website EurekAlert.org.NAFLD, considered as one of the major causes of morbidity and mortality worldwide, is the term used to describe fat build-up in liver cells in people who do not drink alcohol excessively. The disease is the most common persistent liver disorder in Western countries with an estimated overall prevalence of 20-30 percent, according to AAAS.NAFLD encompasses a spectrum of liver disease associated with insulin resistance, diabetes and obesity and as such people most at risk of NAFLD are those who are obese, have insulin resistance associated with diabetes, high blood pressure and cholesterol.

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