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WASHINGTON, Nov. 14 (Xinhua) -- A novel study in twins found that exposure to trichloroethylene (TCE) -- a hazardous organic contaminant found in soil, groundwater, and air -- is significantly associated with increased risk of Parkinson's disease (PD). Possibility of developing this neurodegenerative disease is also linked to perchloroethylene (PERC) and carbon tetrachloride (CCI4) exposure, according to the study appearing in Annals of Neurology on Monday.The National Institute of Neurological Disorders and Stroke estimates that as many as 500,000 Americans have PD and more than 50,000 new cases are diagnosed annually. While there is much debate regarding cause of PD, studies suggest that genetic and environmental factors likely trigger the disease. Several studies have reported that exposure to solvents may increase risk of PD, but research assessing specific agents is limited.The current epidemiological study, led by Samuel Goldman and Caroline Tanner with The Parkinson's Institute in Sunnyvale, California, investigated exposure to TCE, PERC and CCI4 and risk of developing PD. The team interviewed 99 twin pairs in which one twin had PD and one didn't, inquiring about lifetime occupations and hobbies. Lifetime exposures to six specific solvents previously linked to PD in medical literature -- n-hexane, xylene, toluene, CCI4, TCE and PERC -- were inferred for each job or hobby.The findings are the first to report a significant association between TCE exposure and PD -- a more than six-fold increased risk. Researchers also found that exposure to PERC and CCI4 tended toward significant risk of developing the disease. "Our study confirms that common environmental contaminants may increase the risk of developing PD, which has considerable public health implications," commented Goldman in a statement.TCE, PERC and CCI4 have been used extensively worldwide, with TCE noted as a common agent in dry-cleaning solutions, adhesives, paints, and carpet cleaners. Despite the U.S. Food and Drug Administration (FDA) banning the use of TCE as a general anesthetic, skin disinfectant, and coffee decaffeinating agent in 1977, it is still widely used today as a degreasing agent. In the U.S., millions of pounds of TCE are still released into the environment each year and it is the most common organic contaminant found in ground water, detected in up to 30 percent of drinking water supplies in the country.In a release issued on Sept. 28, 2011, the Environmental Protection Agency announced that TCE is carcinogenic to humans.

SAN FRANCISCO, Oct. 10 (Xinhua) -- Apple announced on Monday that pre-orders of its iPhone 4S have topped 1 million in a single day, surpassing the previous single-day pre-order record of the company's smartphone.The iPhone 4S pre-orders surpassed 1 million in the first 24 hours and the previous single day pre-order record held by iPhone 4 is 600,000, according to Apple."We are blown away with the incredible customer response to iPhone 4S," Philip Schiller, Apple's senior vice president of worldwide product marketing, said in a statement."The first day pre-orders for iPhone 4S have been the most for any new product that Apple has ever launched and we are thrilled that customers love iPhone 4S as much as we do," he added.U.S., newly installed Chief Executive Officer Tim Cook takes stage to give a general introduction of Apple's products, Oct. 4, 2011. Apple Inc. last Tuesday unveils iPhone 4S, the much-anticipated latest generation of iPhone.The iPhone 4S, which looks the same as the iPhone 4 but has major hardware upgrade inside, is available for pre-order last Friday and set to first arrive in stores in the United States this Friday.So far, iPhone 4, which, according to Apple, has been sold more than the first three generations of iPhones combined, is Apple's best selling iPhone.The pre-order numbers are good news for Apple as the initial introduction of iPhone 4S last Tuesday has not lived up to the anticipation of some investors and analysts, and spurred a new wave of concerns about whether the company could keep its innovation momentum in the wake of the passing of its co-founder Steve Jobs last Wednesday.

WASHINGTON, Nov. 9 (Xinhua) -- An international team of researchers funded by NASA and the National Science Foundation (NSF) will travel next month to one of Antarctica's most active, remote and harsh spots to determine how changes in the waters circulating under an active ice sheet are causing a glacier to accelerate and drain into the sea, the U.S. space agency announced Wednesday.The science expedition will be the most extensive ever deployed to Pine Island Glacier. It is the area of the ice-covered continent that concerns scientists most because of its potential to cause a rapid rise in sea level. Satellite measurements have shown this area is losing ice and surrounding glaciers are thinning, raising the possibility the ice could flow rapidly out to sea.The multidisciplinary group of 13 scientists, led by Robert Bindschadler, emeritus glaciologist of NASA's Goddard Space Flight Center, will depart from the McMurdo Station in Antarctica in mid- December and spend six weeks on the ice shelf. During their stay, they will use a combination of traditional tools and sophisticated new oceanographic instruments to measure the shape of the cavity underneath the ice shelf and determine how streams of warm ocean water enter it, move toward the very bottom of the glacier and melt its underbelly."The project aims to determine the underlying causes behind why Pine Island Glacier has begun to flow more rapidly and discharge more ice into the ocean," said Scott Borg, director of NSF's Division of Antarctic Sciences, the group that coordinates all U.S. research in Antarctica. "This could have a significant impact on global sea-level rise over the coming century."

SAN FRANCISCO, Nov. 14 (Xinhua) -- Apple on Monday released a new version of its media player program iTunes, adding the much- anticipated scan-and-match service for music iTunes Match.The feature, included in iTunes 10.5.1, can scan a user's library to find music and match the content to the music available in iTunes Store. If it finds a match, users don't need to upload the music and can listen to them anywhere, even better-quality versions, on any devices running Apple's iOS operating system. Music that doesn't match is automatically uploaded.With a subscription fee of 24.99 U.S. dollars a year, users can store up to 25,000 of their own songs in Apple's cloud server. The iTunes Match is currently only available in the United States.Subscriptions for iTunes Match are unavailable for a while Monday morning due to excessive demand.The iTunes Match was first introduced in June along with Apple' s iCloud platform, the company's cloud service enabling users to sync their files, apps and content among Apple devices.Unlike Google and Amazon, Apple got the official blessings from all four major music labels, making the company only need to keep one copy of each song in its cloud server, eliminating the uploading work for users and redundancies for servers.When Apple's late co-founder Steve Jobs introduced the feature in his last keynote address in June, he touted the feature as "an industry leading effort," saying that the 24.99-dollar price is cheaper than Amazon's offering and Google has not announced a price yet.The release is also ahead of Google's latest music push. In an email invitation sent out last Friday, the search giant said it will hold an event called "These Go To Eleven" on Wednesday in Los Angeles. Tech news website The Verge reported that it will be the debut of the company's cloud music service Google Music.

UNITED NATIONS, Nov. 1 (Xinhua) -- China on Tuesday urged the International Atomic Energy Agency (IAEA) to further strengthen its leading role in enhancing global nuclear safety and promoting relevant international cooperation.Wang Min, Chinese deputy representative to the United Nations, made the remarks at an open meeting of the 66th session of UN General Assembly on the IAEA report.IAEA shoulders important responsibilities in promoting peaceful uses of nuclear energy and preventing nuclear proliferation, Wang said, adding that it needs to further summarize experiences and lessons of the Fukushima nuclear accident, assisting member states to enhance nuclear safety and emergency response capabilities.Wang urged the IAEA to "increase technical assistance to developing countries, improve newcomer's national nuclear infrastructure and promote the safe, secure and sustainable development of nuclear energy."The IAEA was also asked to strengthen nuclear safeguards regime, effectively prevent nuclear proliferation, and maintain an objective and impartial stand on sensitive and hot nuclear issues.China has always adhered to the principle of "safety first", he said. "China has established a rather comprehensive legal and standards system on nuclear safety, put in place an independent and effective supervision and regulatory framework, set up a comprehensive emergency response mechanism, and keep a good safety record in general."China has decided to contribute 200,000 U.S. dollars to the Nuclear Security Fund of the IAEA for the purpose of enhancing nuclear security capability of the Asia-Pacific Region, Wang added.