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BEIJING, Aug. 10 (Xinhuanet) -- A new technology can tell pregnant women whether they're having a boy or girl as early as seven weeks into a pregnancy -- months earlier than usual, according to media reports Wednesday.The technology works by detecting "cell-free fetal DNA," or DNA from the fetus, which floats freely in a pregnant woman's blood, said author Diana Bianchi of the Tufts University School of Medicine in Boston. Her analysis of 57 studies from peer-reviewed medical journals showed that these blood tests, common in Europe but not in the U.S. can reveal a fetus' sex only a week or two after a pregnant woman misses her period. Women usually learn the fetus' sex through an ultrasound at 18 to 20 weeks.The technology will help families worried by having a child with rare genetic disorders that typically affect only boys, such as hemophilia or a type of muscular dystrophy, said Joseph Biggio, director of the Trimester Genetics Screening Clinic at the University of Alabama-Birmingham.If they're having a girl, however, they can stop worrying, he added, and avoid further invasive tests, which can provide a definitive answer about genetic disorders, but also increase the risk of miscarriage. Women who learn they're carrying boys would still need a definitive test, such as an amniocentesis, to find out if their fetus is affected.

SAN FRANCISCO, June 1 (Xinhua) -- Microsoft on Wednesday gave a preview of its next-generation operating system code-named "Windows 8."The software giant introduced the successor to Windows 7 at the ninth edition of The Wall Street Journal's Digital: All Things Digital in Rancho Palos Verdes, California, some 48 km south of Los Angeles.With an interface quite different from legacy Windows, Windows 8 looks more like Windows Phone 7 and features an app management from Windows mobile operating system. It is the first major attempt by Microsoft to expand a mobile operating system to desktop status, and is expected to be touch-friendly and work seamlessly on desktops, laptops and tablet computers.For legacy Windows users, they need to swipe up from the bottom of the screen to get to the Windows 7-based view. Microsoft said the new system will be compatible with all Windows 7 logo PCs, software and peripherals.During the demonstration, Steven Sinofsky, Microsoft's head of Windows, also said the importance of not abandoning the established technologies from the traditional PC. "The mouse and the keyboard aren't evil. They're just tools. There are a number of applications that require the greater precision offered by the mouse." said Sinofsky.Sinofsky did not say when Windows 8 would be available.Although there are some tablets running Microsoft's current Windows 7 operating system, the software giant has been criticized for failing to adequately respond to the fast growth of tablet computers, like Apple's iPad.

BEIJING, June 10 (Xinhua) -- The nation's drug watchdog on Friday publicized a draft national standard of sulfur dioxide residue in Chinese herbal medicine, which is open for public opinion until Sept. 9 this year.The maximum amount of sulfur dioxide residue is 400 mg in one kg of each of 11 specified kinds of herbal medicine, such as Chinese yams, Gastrodia elata and Codonopsis pilosola, according to the draft standard unveiled by the State Food and Drug Administration (SFDA).The standard provides a 150-mg-per-kg limit for all other kinds of herbal medicine.Fumigation with sulfur is used as a way of drying some herbal medicine by growers, and currently have no alternative that is both cheap and convenient.The SFDA said it doesn't favor the drying herbal medicine through fumigation with sulfur and urges research efforts to invent new alternatives.According to the World Health Organization, the tolerable maximum amount of sulfur dioxide that a human body can take in one day is 0.7 mg per kg, which means that an adult of 60 kg should not take in more than 42 mg of sulfur dioxide a day.Long-term exposure to high amounts of sulfur dioxide can cause damage to human body, especially the respiratory system, according to experts. 

MOSCOW, Aug. 26 (Xinhua) -- Russia will carry out two unmanned test launches of Soyuz carrier rockets in the coming fall before delivering crews to the International Space Station (ISS), local media reported on Friday.Citing a source, RIA Novosti news agency said that one of the Soyuz rockets was scheduled to send a new Progress M-13M space freighter to the ISS.On Wednesday, a Progress M-12M cargo ship failed to reach the orbit after the engine of a Soyuz-U carrier rocket turned off during the ascend. Soon after the accident, Russia announced it will temporarily ground all Soyuz rockets.Due to the accident, Russian space authorities have put off Thursday's launch of a Soyuz-2 carrier rocket from the Plesetsk Space Center in northern Russia and a launch of a manned space ship from Baikonur space center in Kazakhstan.After the retirement of the U.S. shuttle fleet, Russia's Soyuz spacecrafts have become the only way for astronauts to reach the ISS until at least the middle of the decade.

WASHINGTON, June 15 (Xinhua) -- Using the deepest X-ray image ever taken, astronomers found the first direct evidence that massive black holes were common in the early universe, the U.S. National Aeronautics and Space Administration (NASA) said Wednesday in a statement.The discovery from NASA's Chandra X-ray Observatory shows that very young black holes grew more aggressively than previously thought, in tandem with the growth of their host galaxies.By pointing Chandra at a patch of sky for more than six weeks, astronomers obtained what is known as the Chandra Deep Field South (CDFS). When combined with very deep optical and infrared images from NASA's Hubble Space Telescope, the new Chandra data allowed astronomers to search for black holes in 200 distant galaxies, from when the universe was between about 800 million to 950 million years old."Until now, we had no idea what the black holes in these early galaxies were doing, or if they even existed," said Ezequiel Treister of the University of Hawaii, lead author of the study to appear Thursday in journal Nature. "Now we know they are there, and they are growing like gangbusters."The super-sized growth means that the black holes in the CDFS are less extreme versions of quasars -- very luminous, rare objects powered by material falling onto supermassive black holes. However, the sources in the CDFS are about a hundred times fainter and the black holes are about a thousand times less massive than the ones in quasars.The observations found that between 30 and 100 percent of the distant galaxies contain growing supermassive black holes. Extrapolating these results from the small observed field to the full sky, there are at least 30 million supermassive black holes in the early universe. This is a factor of 10,000 larger than the estimated number of quasars in the early universe."It appears we've found a whole new population of baby black holes," said co-author Kevin Schawinski of Yale University. "We think these babies will grow by a factor of about a hundred or a thousand, eventually becoming like the giant black holes we see today almost 13 billion years later."