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WASHINGTON, Nov. 16 (Xinhua) -- Supervised exercise was shown to be more effective than stenting or medication for improved walking ability in patients with peripheral artery disease (PAD), according to a U.S. study reported Wednesday at the 2011 American Heart Association Scientific Sessions meeting.The research group reported that of 111 patients studied in the randomized trial, the most effective treatment proved to be supervised exercise based on the results of a treadmill test taken at baseline and again at six months. Patients who were in the supervised exercise group improved by a mean of 4.6 minutes in the treadmill test, while the group who received stents improved by a mean of 2.5 minutes. However, researchers found that self-reported quality of life measurements proved to be higher in the group that received stents, even though their ability to walk did not improve as greatly as the group that received supervised exercise rehabilitation.The findings were published in the November issue of the journal Circulation. The researchers believe that more studies are necessary, although supervised exercise may be an effective treatment recommended for PAD patients with claudication.PAD is a condition in which plaque builds up in the arteries and affects blood flow, especially to the legs. It is estimated that between 10 and 12 million people suffer from PAD in the United States. One symptom of PAD is known as claudication, a painful cramping of the leg muscles that limits the patient's ability to walk. It affects nearly 2 million people who suffer from PAD, and results in a sedentary lifestyle and poor quality of life.Current U.S. guidelines for the treatment of claudication include pharmacotherapy, supervised exercise rehabilitation and lower extremity revascularization using stents.

BEIJING, Oct. 18 (Xinhuanet) -- NASA recently unveiled its new rocket design, named Space Launch System (SLS), according to media reports.The rocket will make its first unmanned flight in 2017, and the flight with astronauts aboard won't happen until 2021, according to NASA's plan.The new rocket was 320 feet in length (the space shuttle was 184 feet on the launch pad), 5.5 million pounds in weight, and with the capacity of holding four astronauts at the top speed of 25,000 miles per hour, Washington Post reported Tuesday.Compared with space shuttle and other predecessors, the new rocket will aim for much farther destinations into the space with its most powerful engine ever built, according to the plan."We're investing in technologies to live and work in space, and it sets the stage for visiting asteroids and Mars," the NASA administrator Charles Bolden briefed the media at a news conference in Washington.NASA expected to devote 3 billion U.S. dollars a year to the effort, or a total of about 18 billion U.S. dollars over the next six years, said William Gerstenmaier, the agency’s associate administrator for human exploration.The current financial condition of U.S. may slow down the pace of progress, which will be much slower than NASA's Apollo heyday in the 1960s.

BEIJING, Oct. 11 (Xinhuanet) -- Debates in the medical field developed on Monday as a U.S. government panel recommended that men of all ages should stop getting prostate cancer blood screenings.The United States Preventive Services examined all the evidence and found little if any reduction in deaths from routine P.S.A. screening and suggested that the test does more harm than good to healthy men.The P.S.A. test for prostate cancer, a blood test to screen for a protein that may indicate cancer, has become widely used because it can help detect tiny tumors at a very early sta ge, when they are theoretically most treatable.Unfortunately, according to the task force, the vast majority of the results are false-positives: the men don’t actually have cancer. And most of those found to have cancerous cells would not suffer ill effects because their cancer is so slow-growing that it would not cut short their lives. Those with faster-growing cancers may also not be helped if the cancer is extremely aggressive.After the recommendation came out last week, many prostate cancer specialists have been pushing back.Urologist Dr. Mark DeGuenther said this recommendation is more about saving money than saving lives. He said death rates from prostate cancer have dropped 40 percent since men began getting screened at age 40 and he says it will save taxpayers and patients more money in the long run to diagnose and treat cancers earlier rather than wait and have to provide expensive care for advanced stage cancers."We all agree that we've got to do a better job of figuring out who would benefit from P.S.A. screening," said Dr. Scott Eggener, a prostate cancer specialist at the University of Chicago. "But a blanket statement of just doing away with it altogether ... seems over-aggressive and irresponsible."Dr. Deepak Kapoor, chairman and chief executive of Integrated Medical Professionals, which includes the nation's largest urology practice, said "We will not allow patients to die, which is what will happen if this recommendation is accepted."That task force's recommendation isn't final - it's a draft open for public debate. And obviously the debate is already under way.

WASHINGTON, Dec. 2 (Xinhua) -- The U.S. Justice Department Friday approved Google's 400 million dollar acquisition of Admeld, a company that provides an online advertising platform for publishers.The Justice Department concluded that it was "not likely to substantially lessen competition in the sale of display advertising."Google operates the largest Internet search engine in the world and one of the largest display advertising platforms. It had revenues of about 29 billion dollars in 2010, most of which came from ads revenue.Admeld, with annual revenue of 30 million dollars, offers technology services to Internet publishers that help them boost revenue by optimizing ads display from hundreds of sources.Google is expected to grab 9.3 percent of online display advertising spending in the U.S. this year, up from 8.6 percent last year, making it the No. 3 provider, according to the digital intelligence company Emarketer.The No. 1 position will be taken by Facebook with its share increased to 16 percent up from 12 percent a year ago, while Yahoo! will slip slightly to 13 percent, said Emarketer.

HONOLULU, United States, Nov. 10 (Xinhua) -- Chinese President Hu Jintao arrived in Honolulu, Hawaii, on Thursday for the Economic Leaders Meeting of the Asia-Pacific Economic Cooperation (APEC), slated for Saturday and Sunday.At the annual meeting, leaders of the 21-member group will exchange views on economic growth in the Asia-Pacific region, strengthening regional economic integration and expanding trade.They will also consider the promotion of green growth and fostering job creation in green industries, energy security, and expanding regulatory cooperation and advancing regulatory convergence.Chinese President Hu Jintao (C) arrives in Honolulu, Hawaii, U.S., Nov. 10, 2011. Chinese President Hu Jintao arrived in Honolulu, Hawaii, on Thursday for the Economic Leaders Meeting of the Asia-Pacific Economic Cooperation (APEC), slated for Saturday and Sunday.President Hu is expected to speak at the meeting and express his views on the world economic situation and the regional economic situation, Wu Hailong, assistant foreign minister of China, said at a press briefing earlier this week.In his speech, Wu said, the Chinese leader will call for "improving global economic governance, shifting the growth method, promoting economic globalization and regional economic integration."Hu will also explain "China's stand on the issues of free and open trade and investment, green growth, the adjustment of economic structure and regulatory cooperation," Wu said.In Hawaii, Hu will join other APEC leaders in dialogue with the APEC Business Advisory Council (ABAC).APEC leaders are expected to discuss with ABAC representatives, among other things, regional economic integration, reform of the international monetary system, and food security.The Chinese leader is scheduled to deliver a speech at the APEC CEO summit Saturday.On the sidelines of the APEC Economic Leaders Meeting, President Hu will meet U.S. President Barack Obama and other leaders of APEC members."China hopes the meeting will further promote the free and open trade and investment in the Asia-Pacific region, push forward economic and technology cooperation, support multilateral trade systems, oppose trade protectionism, so as to inject vitality into world economic recovery and growth," Assistant Commerce Minister Yu Jianhua said at a press briefing earlier this week.APEC is the premier economic forum in the Asia-Pacific region.Since APEC's birth in 1989 it has grown to encompass 21 members spanning four continents, and represents the most economically dynamic region in the world, accounting for approximately 40 percent of the world's population, around 50 percent of world GDP and about 44 percent of world trade.APEC's 21 member economies are Australia, Brunei, Canada, Chile, China, China's Hong Kong, Indonesia, Japan, Republic of Korea, Malaysia, Mexico, New Zealand, Papua New Guinea, Peru, the Philippines, Russia, Singapore, Chinese Taipei, Thailand, the United States and Vietnam.