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LOS ANGELES, April 3 (Xinhua) -- People with lower levels of vitamin D are more likely to have stiffer arteries and an inability of blood vessels to relax, U.S. researchers have found.This finding also applies to people who are in general good health, according to researchers from the Emory University School of Medicine.The researchers presented their findings on Sunday at the annual American College of Cardiology meeting in New Orleans.Impaired vascular health in correlation with lower vitamin D levels contributes to high blood pressure and the risk of cardiovascular disease, the researchers say.The study involved 554 participants, with the average age of 47 and generally healthy.The average level of 25-hydroxyvitamin D (a stable form of the vitamin reflecting diet as well as production in the skin) in participants' blood was 31.8 nanograms per milliliter. In this group, 14 percent had 25-hydroxyvitamin D levels considered deficient, or less than 20 nanograms per milliliter, and 33 percent had levels considered insufficient, less than 30 nanograms per milliliter.The researchers monitored the ability of participants' blood vessels to relax by inflating and then removing a blood pressure cuff on their arms. To allow blood to flow back into the arm, blood vessels must relax and enlarge -- a change that can be measured by ultrasound. The researchers also made other measurements of smaller blood vessels and examined the resistance to blood flow imposed by the arteries.

WASHINGTON, April 4 (Xinhua) -- The U.S. National Aeronautics and Space Administration (NASA) announced on Monday that following discussions among the International Space Station partners on Sunday, it is delaying the launch of space shuttle Endeavour's STS- 134 mission to April 29 from April 19.The new launch time is set for 3:47 p.m. EDT (1947 GMT) on Friday, April 29."The delay removes a scheduling conflict with a Russian Progress supply vehicle scheduled to launch April 27 and arrive at the station April 29," NASA said in a statement.NASA managers will hold a Flight Readiness Review on Tuesday, April 19, to assess the team's readiness to support launch. An official launch date will be selected at the conclusion of the meeting.Endeavour will deliver to the space station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer.

BEIJING, March 15 (Xinhuanet) --After one-year effort of developing, Microsoft is going to release its newest web browser Internet Explorer 9 at 9:00 p.m. Pacific time on Monday, according to media reports.The IE 9 will be the first major Web browser to include a do-not-track tool that helps people keep their online habits from being monitored, which makes Google Inc. and Apple Inc. the only big providers of browsers that haven't yet declared their support for a do-no-track system in their products.IE 9 can work on computers running Windows Vista and Windows 7 operating systems, but not compatible with Windows XP.This final release-to-Web version of IE 9 represents the ninth release since the first platform preview of the browser appeared at the MIX 10 Web developer event, said Ryan Gavin, the senior director of Internet Explorer business and marketing. Gavin pointed out that the browser has already made its mark in Microsoft's download history."We're seeing now upwards of two percent share already on Windows 7 for IE 9, even in beta stage. It was the fastest adopted beta ever in Microsoft's history," he said.IE 9 is being launched as part of the South by Southwest event currently taking place in Austin, Texas.

WASHINGTON, March 9 (Xinhua) -- U.S. space shuttle Discovery landed safely at the Kennedy Space Center in Florida on Wednesday, ending its nearly 27-year flying career as the world's most- traveled spaceship.According to NASA, Discovery touched down at 11:57 a.m. EST ( 1657 GMT) after a 13-day resupply mission to the International Space Station (ISS)."For the final time: wheels stop," Discovery's commander Steven Lindsey called out as the shuttle rolled to a full stop.Discovery lifted off on Feb. 24 from the Kennedy Center and arrived at the space station on Feb. 26.During the mission, the astronauts installed a spare closet module on the space station, completed some important repairs and delivered the first humanoid robot, though it will need more time to be assembled and made operational.The 330-pound R2 consists of a head and a torso with two arms and two hands. Once it is unpacked -- likely several months after its arrival at the station -- it will initially be operated inside the Destiny laboratory for operational testing, but over time both its territory and its applications could expand.Aboard the station, its primary job for now is teaching engineers how dexterous robots behave in space. However, the hope is that through upgrades and advancements, it could one day venture outside the station to help spacewalkers make repairs or additions to the station or perform scientific work.

SAN FRANCISCO, May 11 (Xinhua) -- Google on Wednesday introduced a series of notebook computers based on its Chrome operating system, stepping up its competition against Microsoft.Google unveiled the "Chromebook" at its annual developers conference in San Francisco, saying that the new devices, made by Acer and Samsung Electronics, will go on sale on June 15 in the United States and six European countries.Google said Chromebooks can boot in 8 seconds and its security system makes it require no virus protection. Applications, documents and setting will be stored in "the cloud," which enables users to have same experience after logging into another Chromebook. The system will get updated automatically with no update prompts.Acer's Chromebook will start at 349 U.S. dollars and Samsung's product will be priced at 429 dollars for its WiFi model and 499 dollars for 3G connectivity. The devices will be available online in the United States through Amazon.com and Best Buy's online store.Google on Wednesday also announced Chromebooks for Business and Education, a subscription service including Chromebooks and a cloud management console to remotely administer and manage users, devices applications and policies.Google said it will directly handle the business and education orders. The monthly fee will be 28 dollars per user for businesses and 20 dollars per user for educational customers.The Chrome operating system, announced in July 2009, is designed to work exclusively with web applications, with its work based on Google's Chrome web browser.On Wednesday's conference, Google said the Chrome web browser now has 160 million active users, compared to 70 million last May.