沈阳哪家医院专业治疗黄褐斑(沈阳一般治疗痘痘多少钱) (今日更新中)

SAN FRANCISCO, March 20 (Xinhua) -- Boeing's 747-8 Intercontinental took to the sky for the first time on Sunday, a milestone for the U.S. aviation giant's latest and biggest passenger plane.Live webcast by Boeing showed that a 747-8 Intercontinental touched down at around 2:25 p.m. PST (2125 GMT) Sunday at the Boeing Field airport in Seattle in the U.S. states of Washington, after wrapping up the airplane's inaugural flight that lasted about four and half hours.During the test flight, the pilots did some system and function checks and everything went fine, according to the webcast.The new 747-8 Intercontinental can carry 467 passengers in a three-class configuration, said Boeing, which touted the new wide- body jet airliner as the only airplane in the 400-500 seat market.The Boeing 747-8 Intercontinental takes off on its maiden flight from Paine Field, in Everett, Washington, March 20, 2011. The 747-8 Intercontinental willseat 467 passengers, 51 more than the latest model of the classic 747, and burn less fuel while offering passengers more comfort, the U.S. planemaker says.Using 787-technology GEnx engines, the airplane will be quieter, produce lower emissions and achieve better fuel economy for airlines, Boeing said.The airplane also features a new wing design and an upgraded flight deck. Its interior incorporates features from the Boeing 787 Dreamliner including a new curved, upswept architecture that will give passengers a greater sense of space and comfort, while adding more room for personal belongings.Boeing has noted that compared with its predecessor, the 747- 400, the 747-8 Intercontinental provides 16 percent better fuel economy, 16 percent less carbon emissions per passenger and generates 30 percent smaller noise footprint, while carries 51 more passengers.Boeing in February said that Korean Air, VIP customers and launch customer Lufthansa have ordered a total of 33 747-8 passenger planes, with the first delivery scheduled for the fourth quarter of this year.It is reported that the 747-8 Intercontinental has a list price of about 317 million U.S. dollars.Earlier in March, Boeing announced that it has signed an agreement with Air China for the purchase of five 747-8 Intercontinental jetliners.

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.

NANJING, April 23 (Xinhua) -- At a time when almost every commodity in China is getting more expensive, the dwindling cost of medicine is a rarity.Zhang Jinkui, a hypertension patient, buys medicines from the community health center of his neighborhood in Changzhou, a city in east China's coastal Jiangsu Province.His prescription list includes Aspirin Enteric-coated tablets, down to 1.4 yuan from 4.7 yuan (0.7 U.S. dollars) per unit, and Fosinopril Sodium Tablets, down to 41.39 yuan from 51.6 yuan per unit.Both drugs are found on the essential drug list unveiled in 2009. The list names the 307 most common western and traditional Chinese medicines, which are heavily subsidized so hospitals can sell them at cost price.A consumer buys medicines with the help of a retailer at a pharmacy in Lianyungang, east China's Jiangsu Province, March 28, 2011.All essential medicines are listed by their generic names, and drug producers compete to supply essential medicines through public procurement.Due to a long history of low government funding for state-run hospitals, which often covers only 10 percent of the hospitals' operating costs, doctors have generated income for hospitals by aggressively prescribing expensive, and sometimes unnecessary, medicines and treatments.The essential medicine system and the reform of publicly funded hospitals, two pillars of China's health reform, are designed to address high medical costs and low accessibility of medical services.In April 2009, China kicked off health reforms aimed at correcting these long-standing problems facing China's health system and easing public grievances.Two years later, the essential medicine system has reduced drug prices, but still fails to please hospitals, patients and drug producers.The system requires government-funded grassroots health clinics, including urban community health centers and rural clinics, to prescribe only essential medicines and to sell these medicines at cost price, rather than with the previous 15 percent mark-up.Such policies have brought hard times to grassroots health clinics, especially in cash-strapped areas.Song Wenzhi, a public health professor at Peking University, said "Grassroots health clinics, without the expertise to perform operations and other treatments, rely heavily on selling drug," adding that these hospitals have found themselves scraping by due to the zero percent mark-up policy.Wang Zhiying, Vice Director of the People's Hospital of Anxiang County in the city of Changde, Hunan Province, said four grassroots hospitals in Changde tested the essential medicine system as pilot projects, but the zero percent mark-up policy took away 60 to 70 percent of the hospitals' revenue.Wang was quoted by "Health News," a newspaper run by China's Ministry of Health, as saying that, due to financial difficulties, the county government had not yet channeled the 8 million yuan (1.2 million U.S.dollars) in support funds into the hospitals' accounts, resulting in the resignations of many doctors.The essential medicine system covers 60 percent of government-funded grassroots hospitals and drug prices have fallen by an average of 30 percent, said Sun Zhigang, Director of the Health Reform Office under the State Council, or China's Cabinet.According to the health reform plan for 2011, the essential medicine system will cover all government-sponsored health institutions at the grassroots level by the end of the year and drugs will be sold there at a zero percent mark-up.Song Wenzhi said the key will be the commitment of local governments to health reform and their financial input. This way, essential medicines can benefit the public without bankrupting grassroots health institutions."That would be a great sum of money." said Song, citing his own studies. "There are roughly 5,000 government-funded hospitals in China. One third of them make profits, one third barely break even, and still one third rely heavily on government subsidies."To maintain the poorest hospitals, central and local level governments would need to invest 15 billion yuan (2.3 billion U.S. dollars) each year, according to Song's estimate.

WASHINGTON, May 11 (Xinhua) -- Johns Hopkins University researchers have demonstrated that human liver cells derived from adult cells coaxed into an embryonic state can engraft and begin regenerating liver tissue in mice with chronic liver damage.The work, published Wednesday in the journal Science Translational Medicine, suggests that liver cells derived from so- called "induced-pluripotent stem cells (iPSCs)" could one day be used as an alternative to liver transplant in patients with serious liver diseases, bypassing long waiting lists for organs and concerns about immune system rejection of donated tissue."Our findings provide a foundation for producing functional liver cells for patients who suffer liver diseases and are in need of transplantation," says Yoon-Young Jang, assistant professor of oncology at the Johns Hopkins Kimmel Cancer Center. "iPSC-derived liver cells not only can be generated in large amounts, but also can be tailored to each patient, preventing immune-rejection problems associated with liver transplants from unmatched donors or embryonic stem cells." A microsopic view shows human embryonic stem cells in various stages of differentiation into liver cells in this photo taken at Stanford University and released by the California Institute for Regenerative Medicine, March 9, 2009iPSCs are made from adult cells that have been genetically reprogrammed to revert to an embryonic stem cell-like state, with the ability to transform into different cell types. Human iPSCs can be generated from various tissues, including skin, blood and liver cells.Although the liver can regenerate in the body, end-stage liver failure caused by diseases like cirrhosis and cancers eventually destroy the liver's regenerative ability, Jang says. Currently, the only option for those patients is to receive a liver organ or liver cell transplant, a supply problem given the severe shortage of donor liver tissue for transplantation. In addition, mature liver cells and adult liver stem cells are difficult to isolate or grow in the laboratory, she says. By contrast, iPSCs can be made from a tiny amount of many kinds of tissue; and the embryonic stem- like iPSCs can grow in laboratory cultures indefinitely.For the study, Jang and colleagues generated human iPSCs from a variety of adult human cells, including liver cells, fibroblasts ( connective tissue cells), bone marrow stem cells and skin cells. They found that though the iPSCs overall were molecularly similar to each other and to embryonic stem cells, they retained a distinct molecular "signature" inherited from the cell of origin.

LOS ANGELES, April 27 (Xinhua) -- Air pollution poses a threat to the health of about 154 million Americans -- or more than half of the U.S. population, the American Lung Association (ALA) said on Wednesday.The air is so polluted in some areas that it is often dangerous to breathe, the ALA said in its annual report on air quality across the United States.About 48 percent of U.S. residents live in counties where smog (ozone) is too high, 20 percent live in areas where there are too many short-term spikes in pollution and six percent live in areas with harmful year-round soot (particle pollution), said the report.About 17 million Americans live in areas afflicted by all three air pollution hazards, the report noted.The report listed California as the most polluted state, where people are breathing some of the worst air.Compared with other states, California has more polluted places, including Los Angeles, Long Beach, Riverside, Bakersfield and Fresno, the report said.Honolulu in Hawaii and Santa Fe-Espanola in New Mexico are the only two cities in the nation that had no days in which smog and soot levels reached unhealthy ranges, making them the cleanest cities in the nation, said the report.Research suggests air pollution threatens human health -- and not just the lungs.Small particles of pollution can lodge deep in the lungs, triggering an inflammatory process that, over time, can spread elsewhere in the body and damage blood vessels and the heart, according to Dr. Norman Edelman, the ALA's chief medical officer.On days in which smog levels spike, there's an increase in hospital admissions for respiratory illnesses, heart attacks and stroke in the two or three days following it, said Michael Jerrett, a professor of environmental health sciences at University of California, Berkeley's School of Public Health.In addition to posing both long-term and short-term risks, pollution can also contribute to low birth weights, diabetes, cardiovascular disease, heart attack, stroke and, ultimately, shorter life spans, he warned.

来源：资阳报