黄褐斑的病因是什么(白斑的预防) (今日更新中)

BEIJING, Jan. 21 (Xinhua) -- A locomotive producer in central China's Hunan province on Friday rolled out a low-cost magnetically levitated (maglev) train that is more environmental-friendly than conventional ones.The three-carriage train is designed to run at a maximum speed of 100 km per hour and carry 600 passengers, said Xu Zongxiang, general manager of Zhuzhou Electric Locomotive Co. Ltd. of China South Locomotive and Rolling Stock Corporation (CSR). Xu said the new train was much quieter than conventional ones. While a conventional train moves forward by using friction between its wheels and the railway tracks, the maglev train replaces wheels by electromagnets and levitates on the guideway. According to Xu, his company's has minimized the risk of the new maglev train derailing or overturning. "It's ideal for mass transportation, as it is quiet and environmental-friendly. Its manufacturing cost is about 75 percent of a conventional light-rail train," said Xu. The maglev train has a minimum turning radius of 50 meters and can easily run in residential communities or on hilly slopes. "It's an ideal public transport option for Chinese cities and major tourist destinations," said Xu. Railway transport specialist Liu Youmei, also an academician with Chinese Academy of Engineering, said the new train is green, economical and safe. "It can be used for public transport in populous areas and at scenic spots with fragile environments." Liu said China is one of a few countries that have applied maglev technology. Beijing is building a maglev route, the Daitai line (S1), which starts at its IT center in Haidian district, passes through Shijingshan district, and ends in Mentougou district on its western outskirts. The line will be operational next year.The eastern metropolitan of Shanghai runs the world's first commercial maglev system on a 30-km stretch between the downtown business district and Pudong airport. The German-made maglev went into operation on Dec. 31, 2002.

ADDIS ABABA, Nov. 2 (Xinhua) -- Ethiopia will host the 13th World Congress on Public Health (WCPH) in April 2012, the Ethiopian Public Health Association (EPHA) said on Wednesday.The meeting will be held on April 23-27 under the theme: "Moving towards Global Health Equity- Opportunities and Treats".Speaking on the 22nd annual meeting of EPHA held here on Wednesday EPHA President Tewabech Bishaw said about 3,000 participants, including public health students from all over the world are expected to take part in the meeting.He said that preparations are well underway to successfully conduct the meeting.

SAN FRANCISCO, Nov. 4 (Xinhua) -- With its popular iPhone series, Apple seized more than half of the profits generated by the top eight mobile phone manufacturers during the third quarter, said a monthly market analysis released on Friday.Apple generated a remarkable 52 percent of handset industry operating profits for the top eight OEMs (original equipment manufacturers) in the third quarter, up five percent over the same period of 2010, said Canaccord Genuity technology analyst Michael Walkley.The number was down from 57 percent in the second quarter, due to a drop in iPhone sales as customers held out for the upcoming iPhone 4S.A proud Apple customer shows off the new iPhone 4S he purchased at an Apple store in Munich, Germany.Apple's major rival in the mobile industry is Samsung. The two companies together represented 81 percent of the handset industry' s operating profits last quarter.Other major mobile phone manufacturers are Nokia, Motorola, Sony Ericsson, HTC, Research In Motion and LG.Calling it "an epic reversal of fortunes," Walkley noted that in 2007, Nokia had 67 percent of operating profits while Apple had just 4 percent. Compared with Apple's 52 percent of industry profits in the third quarter of 2011, Nokia has been relegated to its rival's former position with just 4 percent of operating profits.The analyst said he has conducted "channel checks" that show strong demand not only for the new iPhone 4S but also for the previous models of iPhone 4 and iPhone 3GS. He told technology news website AllthingsD that Apple is believed to be able to gain further value share in the December quarter and capture over 60 percent of industry profits.In a Bloomberg report on Friday, several technology analysts said the two-year-old iPhone 3GS, whose price has been slashed to zero if it is purchased with a contract, will become one of Apple' s big weapons in the coming holiday season against smartphones running Google's Android system.

BEIJING, Oct. 12(Xinhuanet) -- People allergic to peanuts may find relief in a new research by American scientists, according to Huffington Post Monday.Scientists from the Northwestern University Feinberg School of Medicine have found a way to turn off allergic responses by creating an immune system tolerant to peanuts.They attached peanut proteins, the source of the allergy, to white blood cells of mice. Then the mice's immune systems would recognise the proteins and become tolerant to them.When people eat peanuts, allergic human bodies would recognize peanut proteins as invading pathogens and trigger immune responses like throat swelling, even closing up, which can be lethal. Ditto for mice's bodies.But when peanut protein attached to the body's own cells, the immune systems would regard the peanut proteins as perfectly normal and not attack the cells, said Paul Bryce, an assistant professor involved in the study. Then the allergic responses disappeared.The research was conducted on mice. But the scientists expected the method to cure peanut allergies could apply to humans, according to Huffington Post.Although the research was promising, it did not mean that peanut allergies in humans could be actually cured in the foreseeable future, said Dr. Clifford Basset medical director at Allergy and Asthma Care of New York, to ABC News, "Its all about education, prevention and preparedness".

WASHINGTON, Dec. 12 (Xinhua) -- British scientists have discovered a new way to target cancer through manipulating a master switch responsible for cancer cell growth. The findings, published Monday in the U.S. journal Cancer Cell, reveal how cancer cells grow faster by producing their own blood vessels.Cancer cells gain the nutrients they need by producing proteins that make blood vessels grow, helping deliver oxygen and sugars to the tumor. These proteins are vascular growth factors like VEGF -- the target for the anti-cancer drug Avastin. Making these proteins requires the slotting together of different parts of genes, a process called splicing.Scientists at the University of West England and the University of Bristol discovered that mutations in one specific cancer gene can control how splicing is balanced, allowing a master switch in the cell to be turned on. This master switch of splicing makes cancer cells grow faster, and blood vessels to grow more quickly, as they alter how VEGFs are put together.In experimental models, the researchers found that by using new drugs that block this master switch they prevented blood vessel growth and stopped the growth of cancers."The research clearly demonstrates that it may be possible to block tumor growth by targeting and manipulating alternative splicing in patients, adding to the increasingly wide armory of potential anti-cancer therapies," the authors said.

来源：资阳报