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WASHINGTON, May 11 (Xinhua) -- Researchers at Brigham and Women 's Hospital (BWH), a teaching affiliate of Harvard Medical School, have identified a human lung stem cell that is self-renewing and capable of forming and integrating multiple biological structures of the lung. This research will be published Thursday in the New England Journal of Medicine."This research describes, for the first time, a true human lung stem cell. The discovery of this stem cell has the potential to offer those who suffer from chronic lung diseases a totally novel treatment option by regenerating or repairing damaged areas of the lung," said the study's corresponding author Piero Anversa, who is also director of the Center for Regenerative Medicine at the hospital.Using lung tissue from surgical samples, researchers identified and isolated the human lung stem cell and tested the functionality of the stem cell both in vitro and in vivo. Once the stem cell was isolated, researchers demonstrated in vitro that the cell was capable of dividing both into new stem cells and also into cells that would grow into various types of lung tissue. Next, researchers injected the stem cell into mice with damaged lungs. The injected stem cells differentiated into new bronchioles, alveoli and pulmonary vessel cells which not only formed new lung tissue, but also integrated structurally to the existing lung tissue in the mice.The researchers define this cell as truly "stem" because it fulfills the three categories necessary to fall under stem cell categorization: first, the cell renews itself; second, it forms into many different types of lung cells; and third, it is transmissible, meaning that after a mouse was injected with the stem cells and responded by generating new tissue, researchers were then able to isolate the stem cell in the treated mouse, and use that cell in a new mouse with the same results."These are the critical first steps in developing clinical treatments for those with lung disease for which no therapies exist. Further research is needed, but we are excited about the impact this discovery could have on our ability to regenerate or recreate new lung tissues to replace damaged areas of the lungs," said Joseph Loscalzo, chair of the Department of Medicine at BWH and co-author.

BEIJING, May 19 (Xinhuanet) -- Google on Wednesday began fixing a security hole in some 97 percent of Android phones that could let hackers snatch important credentials at public WiFi hotspots.The fix, which addresses a hole allowing hackers to access the contacts, calendars and photos on an Android phone connected to an open WiFi network, will take a few days to cover every phone, a Google spokesman said.Unlike a traditional software update, the problem exists on Google's servers, so Android users won't need to manually take action.The newest versions of Android, including the new wave of tablets running its Honeycomb software, are not affected by the bug, according to the researchers at Germany's University of Ulm who initially reported the issue.The vulnerability could also cause devices synchronizing with Google Picasa web albums to transmit sensitive data through unencrypted channels, the researchers added.The Google spokesman said the company's security team is still investigating those claims.

BEIJING, Feb. 18 (Xinhua) -- In the next five years, China will further expand the coverage of its basic medical insurance system and ease the cost of medical services, Health Minister Chen Zhu said Friday.Chen made the remarks while addressing a meeting for the reform of the health care system.The medical expenditure that shouldered by individuals had been cut to 38.2 percent of China's annual overall spending on medical services in 2009, down from 60 percent in 2001, thanks to increasing government funding support for the measure, said Chen.He said the country is striving to bring down the ratio to below 30 percent by the end of the country's 12th five-year plan period (2011-2015).China is steadily pushing towards the implementation of a basic medicine system which aims to ensure affordable access to essential drugs for patients, Chen said.In the areas already covered by basic medicine system, the average price of basic medicine has dropped by around 30 percent, Chen added.He said that the reform of government-run hospitals, which is key to ensure that the masses gain universal access to basic health care services, must be undertaken.In 2011, more measures will be made to restructure the distribution of public hospitals, reform government-run traditional Chinese medical institutions and support building and developing hospitals in county-level regions, Chen said.

DAVOS, Switzerland, Jan. 27 (Xinhua) -- A policy of more trade and greater openness to the rest of the world has brought significant benefits to China and greater market opportunities to its trading partners, the head of the World Trade Organization says."I don't think there is any question that China joining the WTO has been a very good thing for China and for the WTO and its members," WTO Director General Pascal Lamy said in an interview with Xinhua.The WTO chief was expected to join the forum "China's Impact on Global Trade and Growth" on the sidelines of the World Economic Forum annual meeting held in this Swiss alpine town."In joining the WTO, China successfully underpinned a policy of what had been 20 years of progressive openness," Lamy said.Adherence to economic reforms through international commitments ensured that China would stay on the path of openness, he noted, adding that the policy has helped the country economically, politically and socially.Lamy stressed that China has done a "remarkable job" in reducing poverty, which is an important task for the country, along with registering double-digit growth, thus becoming the world's largest manufacturer and the second largest economy.Apart from enhanced market access with its trading partners and more equal treatment in global trade, WTO membership also has allowed China to gain access to the organization's dispute settlement system, Lamy said.According to a WTO report issued in December, as the world's biggest exporter, China ranks first in receiving anti-dumping (AD) investigations, with 23 new AD initiations directed at its exports in the first half of 2010.In recent rulings arbitrated by the WTO Dispute Settlement Body (DSB), China has won a poultry dispute against the United States, and a steel fastener case against the European Union.Being a WTO member, "China would have a seat at the table as negotiations commenced on the trade rules for the 21st century," Lamy said, referring to the decade-long Doha round of global trade negotiations aimed at building the next generation trading system.Even more importantly, for China, participation in the global system of rules and discipline greatly boosted investors' confidence and helped facilitate foreign direct investment in China, he said.On the other side of the coin, China's integration into the world trading system has given enormous driving force to the global economy and market opportunity to its trade partners.

LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.