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BEIJING, Sept. 30 (Xinhuanet) -- The number of children being prescribed stimulants to treat attention deficit hyperactivity disorder (ADHD) has been steadily rising in the U.S. since 1996, researchers found.The finding was contained in a report released Wednesday in the U.S. medical journal Psychiatry.About 7.8 percent of children aged 4 to 17 in 2003 were diagnosed with ADHD, compared to 9.5 percent in 2007, according to the data gathered from the Health Resources and Services Administration's National Survey of Children's Health.And compared to 0.6 percent in 1987, 2.9 percent of children under 19 in 2002 have been prescribed stimulants, the report said.The finding raises the researchers' concern as stimulants have side effects such as decreased appetite, leeplessness and even heart-related damage, the report warned."Stimulant medications work well to control ADHD symptoms, but they are only one method of treatment for the condition. Experts estimate that about 60 percent of children with ADHD are treated with medication." says researcher Benedetto Vitiello, MD, of the U.S. National Institute of Mental Health."There is ongoing concern that these drugs may not be used properly, especially when they are prescribed to college students or children in their late adolescence who are more in charge of their care and may not be using the medications as prescribed." he added.

WASHINGTON, Oct. 19 (Xinhua) -- A total of 25 people have been killed in 12 U.S. states in a listeria outbreak traced to Colorado cantaloupes, the U.S. Centers for Disease Control and Prevention ( CDC) said Wednesday.The number of people sickened by the tainted cantaloupes has reached 123 in 26 states, with Pennsylvania reporting its first case. One of the ill patients, a pregnant woman, suffered a miscarriage, the CDC said in a telebriefing.The listeria outbreak has been the most deadly one since 1998, according to the CDC.Listeria is a common bacterium that typically causes mild illness in healthy people, but can cause severe illness in older people and those with compromised immune systems. It also can cause miscarriages and stillbirths in pregnant women and severe infections in new babies.The CDC estimates that about 48 million people in the U.S. each year get sick from tainted food, with about 128,000 hospitalized and 3,000 deaths.

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.

MOSCOW, Oct. 24 (Xinhua) -- The Russian Space Agency Roscosmos confirmed on Monday the list of next crew members who will fly to the International Space Station (ISS) on Nov. 14.Russia's Soyuz TMA-22 spacecraft will bring Russian cosmonauts Anton Shkaplerov and Anatoly Ivanishin and American astronaut Daniel Burbank to the ISS for a 124-day-long mission.Russia's Gennady Padalka and Sergei Revin and American Josef Akaba are announced as the backup crew.According to the Roscosmos, the new crew will host one manned and three unmanned cargo ships during their stay in the ISS and conduct a space walk as well as 37 scientific experiments.During the new crew's stay, the ISS would also make its 75,000th revolution around the Earth, the Roscosmos said.The launch of the Soyuz TMA-22 was initially scheduled on Sept. 22, but was postponed after the failed launch of the Progress cargo ship to the ISS on Aug. 24.

BEIJING, Oct. 20 (Xinhuanet) -- British scientists used bacteria and DNA to build basic components for digital devices in a new research, according to media reports, suggesting biological computers come closer to reality.Digital devices are based on logic gates, fundamental building blocks in silicon circuitry, said Professor Richard Kitney, leading researcher of the research published in the journal Nature Communications, "Without them, we could not process digital information."According to Science Daily, Professor Kitney and his colleagues from the Imperial College London replicated the building blocks using bacteria and DNA, forming biological logic gates, which paved the way for building more complex biological processors in the future.The researchers hoped biological computers can be applied to monitoring human health in the future.They believed that small biological processors, inserted in human bodies, could roam inside the bodies, monitor the health, and correct any problems they found.These biological logic gates are the most advanced created by scientists. But there is still a long way to go to apply them in reality, said Professor Kitney.

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