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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.

ZHENGZHOU, Feb. 16 (Xinhua) -- China's Yellow River catchment authority has launched emergency measures to restrict industrial water usage and to release reservoir water for wheat crops in the face of a worsening drought.The Yellow River Flood Control and Drought Relief Headquarters raised on Wednesday its drought alert from yellow to orange, the second-highest level, indicating the area is facing the worst drought in up to half a century.The headquarters ordered all authorities along the catchment area to initiate an emergency response to ensure water supplies for people and livestock, and to restrict industrial water consumption.The drought, which has plagued the middle and lower reaches of the Yellow River since October last year, was likely to affect more than 40 percent of crops in the area, said a headquarters spokesman.Light to moderate snowfall brought some relief to the wheat farmers in the region over the weekend, but not enough to end the drought. Most regions along the Yellow River received precipitation of less than 10 mm.Thanks to the recent rise in temperatures, ice covering 120-km of the Yellow river has melted, offering more water for irrigation and other water uses.The headquarters' statistics show that water channeled from the Yellow River reached 228 cubic meters per second at 8 a.m. Tuesday, and supplied the drought-plagued Shandong Province, Tianjin Municipality and Hebei Province.The headquarters had released more water from reservoirs along the catchment to help with the irrigation of winter wheat crops, said the spokesman.The Chinese government on Friday announced plans to dig 1,350 wells in eight major wheat-growing provinces to help ease the drought that is threatening grain harvests.

JINAN, Feb. 3 (Xinhua) -- Chinese Premier Wen Jiabao on Wednesday and Thursday visited drought-hit villages and ordered all-out efforts to combat the dry spell while celebrating the Chinese New Year with local people.When visiting Jiaxiang County and Qufu City in east China's Shandong Province, Wen inspected cornfields and reservoirs to assess the drought's impact.The drought, which began in October, has hit the southwest parts of Shandong hardest."It's hard to know when it will rain. We must prepare for the worst and do our best to combat the drought to ensure a good harvest," Wen said while visiting a reservoir in Qufu.Wen made the remarks Wednesday afternoon after learning the reservoir was holding a volume of water 8 million cubic meters less than normal.He told officials accompanying him any drought-caused reduction in grain output may undermine the government's top priority for 2011: the stabilization of prices.Officials at all levels must work to combat the drought, Wen added.China's central authorities last week announced an ambitious water conservancy project development plan, to raise China's ability to control flooding and drought.Under the plan, the average annual government spending on such projects will double the 2010 level."The drought affects agricultural output, which is related to the nation's food security and the income of rural people. I worry about it," Wen told a local farmer Wednesday morning.In the evening, Wen joined Liu Xianglun, 77, and his family at their house to make dumplings to eat to welcome the Chinese New Year.Before visiting Shandong, Wen visited farmers and workers in Dabieshan Mountain area, an old revolutionary base in east China's Anhui Province.The Spring Festival, China's Lunar New Year, falls on Thursday.

WASHINGTON, May 1 (Xinhua) -- The launch of U.S. space shuttle Endeavour on its final voyage will be no earlier than May 8, after technical problems uncovered last week proved more complex than originally thought, the U.S. National Aeronautics and Space Administration (NASA) announced Sunday.NASA tried to launch Endeavour on Friday on its 25th and final flight to deliver the 2-billion-dollar Alpha Magnetic Spectrometer (AMS) particle detector to the International Space Station. AMS, a particle physics detector, is designed to search for various types of unusual matter by measuring cosmic rays. Its experiments are designed to help researchers study the formation of the universe and search for evidence of dark matter, strange matter and antimatter.The space shuttle Endeavour sits on launch pad 39A as work continues on the shuttle's auxilliary power unit at the Kennedy Space Center in Cape Canaveral, Florida May 1, 2011.However, the launch was called off after engineers detected a failure in one of two heater circuits associated with Auxiliary Power Unit (APU) 1. Heaters are required to keep the APUs' hydrazine from freezing on orbit.NASA hoped Endeavour would lift off on Monday. But further trouble-shooting indicated the glitch was more complicated than officials hoped initially.The failure appears to be a power problem within the aft load control assembly-2, a box of switches controlling power feeds."That basically means the power is not getting out to the heaters that weren't working on launch day," said Space Shuttle Program Launch Integration Manager Mike Moses.

BEIJING, Feb. 10 (Xinhua) -- Chinese researchers have made significant progress in developing key technologies for natural disaster early warning systems and emergency relief, according to the Ministry of Science and Technology (MST).The four-year project, "Research on Key Technologies for Geological Disasters Monitoring, Early Warning and Emergency Relief," was initiated in 2006 with support from China's top-level government scientific research funding program.Scientists involved in the project had made remarkable technological progress in four fields, namely natural disaster recognition in earlier stage, monitoring and early warning, risks assessment and emergency relief, the MST said in a statement on its website.As part of the project, rain-triggered landslide monitoring and early warning systems have been established around Mount Ailao in southwest China's Yunnan Province and in the southeastern area of east China's Fujian Province.A natural disasters monitoring system has been developed by Chinese scientific workers using optical fiber technologies. This system with Chinese intellectual property has been put into use in areas, including the the reservoir region of the Three Gorges Project on the middle reaches of the Yangtze River.According to the MST, the research project also provided substantial technological support in assessment of disasters and relevant relief during China's responses to the Wenchuan earthquake in May 2008 and the massive mudslide in Zhouqu of Gansu last August.

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