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WASHINGTON, Oct. 13 (Xinhua) -- In a trial that included about 35,000 men, those who were randomized to receive daily supplementation with vitamin E had a significantly increased risk of prostate cancer, according to a study published this week in the Journal of the American Medical Association.The study followed more than 35,533 men 50 or older at 427 sites in the United States, Canada and Puerto Rico. The men were divided into four groups who took daily doses of 400 international units of Vitamin E and 200 micrograms of selenium; Vitamin E and a placebo that looked like selenium; selenium and a placebo that looked like Vitamin E; or two placebos. The recommended daily intake of Vitamin E is about 22.4 international units.The researchers from the Cleveland Clinic found that the rate of prostate cancer detection was greater in all treatment groups when compared with placebo but was statistically significant only in the vitamin E alone group -- a 17 percent increased rate of prostate cancer detection. The difference in rates of prostate cancer between vitamin E and placebo became apparent during the participants' third year in the trial. The elevated risk estimate for vitamin E was consistent across both low- and high-grade disease."The observed 17 percent increase in prostate cancer incidence demonstrates the potential for seemingly innocuous yet biologically active substances such as vitamins to cause harm. The lack of benefit from dietary supplementation with vitamin E or other agents with respect to preventing common health conditions and cancers or improving overall survival, and their potential harm, underscore the need for consumers to be skeptical of health claims for unregulated over-the-counter products in the absence of strong evidence of benefit demonstrated in clinical trials," the researchers said.

SAN FRANCISCO, Oct. 4 (Xinhua) -- Apple Inc. on Tuesday unveils iPhone 4S, the much-anticipated latest generation of iPhone.At the event held at Apple headquarters in Cupertino, California, U.S., newly installed Chief Executive Officer Tim Cook took stage to give a general introduction of Apple's products, his first product presentation after taking over the reins from Steve Jobs in August.According to Apple, there are several key features that make the new iPhone 4S different from the current iPhone 4. With a 3.5- inch widescreen multitouch display, the new device features dual- core A5 processor, the chip used in the iPad 2, and a higher- resolution eight megapixel camera which can grab 73 percent more light and take a 1080p high-definition video.The battery can support internet use up to six hours on 3G network and nine hours on Wi-Fi, as well as talk time up to eight hours on 3G and 14 hours on 2G. 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. on Tuesday unveils iPhone 4S, the much-anticipated latest generation of iPhone.Based on the dual-antenna design of iPhone 4, Apple said that iPhone 4S can intelligently switch back and forth between them to send and receive, improving the reception and throughput on the device. The iPhone 4S is also a world phone, which means both GSM and CDMA network customers can roam internationally on GSM networks on a single phone. It also supports HSPA+, a 4G mobile technology that allows for data transmission speeds up to 42 Mbps.Another important feature is the new voice control called Siri, an intelligent assistant that helps users get things done just by asking questions, such as call people, reminders, compose and dictate email, weather, stocks, search web and etc..For example, Siri understands users who are looking for a weather forecast when they ask questions like "Do I need an umbrella today," "What's the upcoming forecast," and "Is the weather going to get worse today."The iPhone 4S will run the latest version of Apple's mobile operating system iOS 5, which will be available as free update next Wednesday. The new iOS 5 has more than 200 new features, such as a deep Twitter integration, Notification Center and iMessage, a new messaging service.The latest smartphone also comes with the launch of iCloud, Apple's cloud computing service which automatically and wirelessly store users' content and push it to all Apple devices from mobile devices and music players to desktops and notebooks. Apple will launch iCloud next Wednesday."iPhone 4S plus iOS 5 plus iCloud is a breakthrough combination that makes the iPhone 4S the best iPhone ever," said Philip Schiller, Apple's senior vice president of Worldwide Product Marketing. "While our competitors try to imitate iPhone with a checklist of features, only iPhone can deliver these breakthrough innovations that work seamlessly together," said Schiller, who led the iPhone 4S introduction at the Tuesday's event.The new iPhone 4S will start at 199 U.S. dollars with a storage capacity of 16 GB and 399 dollars for the 64 GB model. The pre- orders begin on Friday and the phone will ship next Friday. Apple said that iPhone will be in 70 countries and regions, on 100 carriers when the roll out is done. In the United States, along with AT&T and Verizon, iPhone 4S will also come to Sprint, the third-largest mobile-phone carrier in the country.

NEW YORK, Oct. 14 (Xinhua) -- The iPhone 4S went on sale at Apple store on the Fifth Avenue of Manhattan in New York early Friday.An Apple store worker said people were waiting outside the store around 3 p.m. Thursday and underwent an overnight rain for an early purchase of the smart phone which started sale at 8 a.m. Friday.About 200 people were seen lining up outside the store and some of them said they would like to pay tribute to Steve Jobs, Apple's longtime CEO who died of pancreatic cancer at the age of 56 on Oct. 5."I'm a Steve's fan, iPhone 4S is the best of Steve's work. I am not going to buy iPhone 5,"Jim Bedford, who is in his 30s, said. "Maybe this is my last iPhone," he added.People left a Steve's picture, flowers and apples on the sidewalk to pay respect to Apple's co-founder. Some apples were seen inscribed such words as "Nice job" and "We will always remember you."Tom White, 50, said he had iPhone 1 and 3 and "now is the time to change a new one."The iPhone 4S is operated seven times faster than their predecessor and features an upgraded camera. Apple reported more than 1 million pre-orders for the iPhone 4S, breaking a mark set by last year's model. The phone also went on sale Friday in six other countries -- Britain,Germany,France,Australia, Canada and Japan.

HONG KONG, Oct. 13 (Xinhua) -- Computer and electronic device maker Lenovo, listed in both Hong Kong and New York, has replaced Dell to become the world's second largest personal computer company, Lenovo said Thursday.Lenovo made the remarks in a statement, citing figures released by International Data Corporation (IDC), a global provider of business intelligence for the consumer technology market.Following five quarters as the fastest-growing PC maker among the world's top vendors, the preliminary IDC data reported that Lenovo has achieved record market share of around 13.7 percent and record quarterly shipment volume of some 12.6 million units.Lenovo CEO Yang Yuanqing said his company had surpassed two competitors to capture the No. 2 spot in worldwide PCs in just two quarters and it was the highest rank that Lenovo has achieved in worldwide PC sales.Given current competitive environment, the new achievement positioned Lenovo as a strong challenger to ultimately become the global market leader, Yang said in the statement."We are growing in the enterprise and the consumer space. And our customers know we are fully committed to the PC market for the long term," he said.At the same time, the Chinese multinational would continue investing in innovative products that would help drive the convergence of technologies and services across all four screens -- smart phones, tablets, PCs and smart TV, Yang said."We must deliver a great user experience across all platforms to achieve our goal and become the leading personal technology company in the world."Lenovo is a personal technology company and a global Fortune 500 company with annual sales worth 21 billion U.S. dollars. It serves customers in more than 160 countries and regions.

BEIJING, Jan. 8 (Xinhua) -- China's central authorities have highlighted travel safety as the nation on Sunday officially kicked off the world's largest holiday migration, a time in which mass numbers of passengers will be homeward bound for the traditional Chinese Spring Festival.Safe travel has emerged as a hot-button issue facing the government as passenger trips during the 40-day travel peak are expected to hit a record high of over 3 billion.Liu Tienan, vice chief of the National Development and Reform Commission, the country's top economic planner, told the press on Sunday that passenger transport during the period is not looking good as the enormous migration outweighs existing transportation capacities.?A volunteer guides passengers to their train at Chengdu Railway Station in Chengdu, capital of southwest China's Sichuan Province, Jan. 7, 2012. Starting from Jan. 8, 2012, China's transport system will undergo a 40-day travel rush, which is characterized by a hightened passenger flow around the time of the oncoming Chinese New Year.Liu warned of the likelihood of heavy snow and icy rain that could hamper travel while vowing greater efforts to avoid another travel disaster, as was seen in early 2008 when unprecedented heavy snow and freezing rain inundated the south of the country, bringing traffic to a standstill during the peak holiday season.A total of 3.16 billion passenger trips are expected during the next 40 days, up 9.1 percent from a year earlier, of which, 235 million trips will be made via the country's railways, up 6.1 percent year-on-year.Hu Yadong, vice minister of railways, said a daily average of 5.88 million people will make train trips during the period, 340,000 more than the corresponding period in 2011.At the Beijing Railway Station on Sunday, staff members checked passengers' train tickets and ID cards, as an ID-based train ticket purchasing system kicked off nationwide at the start of the new year in an effort to curb ticket scalping.