沈阳清创缝合训练头部模型(南京脊髓的功能模型) (今日更新中)

LOS ANGELES, May 23 (Xinhua) -- NASA's Gravity Recovery And Interior Laboratory spacecraft (Grail) will begin final preparations for a launch on a Moon mission in late summer, the Jet Propulsion Laboratory (JPL) said on Monday.The dynamic duo will orbit the moon to determine the structure of the lunar interior from crust to core and to advance understanding of the thermal evolution of the moon, according to JPL in Pasadena, Los Angeles.After arriving at the Astrotech payload processing facility in Titusville, Florida last week, the Grail twins, known as Grail-A and Grail-B, were removed from their shipping containers Monday. Later this week, they will begin functional testing to verify their state of health, said JPL.The twins were shipped from Lockheed Martin Space Systems, Denver.Over the next four months at the Astrotech facility, the spacecraft will undergo final testing, fueling and packaging in the shroud that will protect them as the Delta II launch vehicle lifts them into space. The spacecraft will then be transported to the Cape Canaveral Air Force Station for installation atop the rocket that will carry them toward the moon, JPL said."We're only a few full moons away from a mission that will reveal clues not only into the history of the moon and Earth, but will provide important data for future lunar exploration," said Maria Zuber, Grail's principal investigator, based at the Massachusetts Institute of Technology.Grail will be carried into space aboard a United Launch Alliance Delta II Heavy rocket lifting off from Launch Complex-19 at the Cape Canaveral Air Force Station in Florida. The launch period opens Sept. 8, 2011, and extends through Oct. 19. For a Sept. 8 liftoff, the launch window opens at 5:37 a.m. PDT (8:37 a.m. EDT) and remains open through 6:16 a.m. PDT (9:16 a.m. EDT).Grail-A and Grail-B will fly in tandem orbits around the moon for several months to measure its gravity field in unprecedented detail.The mission will also answer longstanding questions about Earth' s moon, and provide scientists a better understanding of how Earth and other rocky planets in the solar system formed, according to JPL, which manages the Grail mission.

BEIJING, Jan. 30 (Xinhua) -- As of Jan. 28, 77.4 million mu (5.16 million acres) of crops had been harmed by the ongoing drought, and 2.57 million people were faced with drinking water shortages in China, the national drought control authorities said Sunday.Local governments of the affected regions must make efforts to monitor drought conditions, speed up the building of water projects, increase drought-fighting material reserves and grant subsidies to the drought-stricken population, said officials at a meeting attended by Chen Lei, deputy head of the Office of State Flood Control and Drought Relief Headquarters (SFDH).The National Meteorological Center (NMC) forecast the drought to worsen in the next two months, saying Sunday that the drought-hit north China and regions along the Yellow and Huaihe rivers would receive little rain or snow in February and March.Chen, also minister of water resources, stressed the importance of drought relief efforts, guaranteeing agricultural production and ensuring drinking water safety for boosting consumers' confidence, controlling consumer prices and inflation and maintaining economic growth.Since last Autumn when the drought began, local authorities have assigned 9.55 million people and 2.15 million sets of drought-fighting machineries to draw 8.2 billion cubic meters of water to irrigate 110 million mu of crop land.

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. 29 (Xinhua) -- China is ready to push the decade-long Doha Round negotiations for a final success, Chinese Minister of Commerce Chen Deming said here on Saturday.Speaking at the World Trade Organization (WTO) Mini-Ministerial Meeting which brought together representatives from over 20 major trading powers, Chen said that China is ready to collaborate with other WTO members in a practical and proactive manner so as to draw a successful conclusion of the Doha Round talks by the end of 2011.A rapid conclusion of the negotiations, Chen said, will be beneficial to global economic recovery, which is to the interest of all.The commerce minister acknowledged the year 2011 as a "window of opportunity," albeit a narrow one."China will give support to the roadmap proposed by WTO Director-General Pascal Lamy," he said, adding that the country is willing to act vigorously to push forward the negotiation process.To ensure that an early final deal could be in reach, Chen said, parties should set goals in a practical manner, in accordance with the ambition level, and stick to what has been achieved as well as the Doha Development Agenda (DDA), while focusing primarily on pending issues.Held on the sidelines of the annual World Economic Forum, the WTO Mini-Ministerial Meeting is an annual event under the auspices of the Swiss Federal Government.Chen on Friday also joined discussions with his counterparts from the emerging club -- India, Brazil and South Africa, before attending the trade G7 meeting, consisting of Australia, Brazil, China, the European Union, India, Japan and the United States.

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.

来源：资阳报