江西高级婴儿护理人模型(甘肃臀部注射实习模型) (今日更新中)

WASHINGTON, May 20 (Xinhua) -- Two U.S. astronauts conducted the first of four spacewalks for space shuttle Endeavour's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) said.According to the U.S. space agency, Endeavour's mission specialists Andrew Feustel and Greg Chamitoff completed the six-hour, 19-minute spacewalk at 9:29 a.m. EDT (1329 GMT). They successfully installed antennas for the External Wireless Communication system, routing cables, setting up the antenna, installing handrails, and connecting power cables.Because of a carbon dioxide sensor failure in Chamitoff's spacesuit, flight controllers limited his spacewalk time to about six hours 20 minutes, 10 minutes less than the planned six hours and 30 minutes. There was no indication his suit's carbon dioxide levels would rise. However, they deferred tasks to remove a micrometeoroid debris shield to access and attach some of the connection points.This was the 245th spacewalk conducted by U.S. astronauts. It was Feustel's fourth spacewalk for a total time of 27 hours and 17 minutes, and Chamitoff's first.Endeavour lifted off on Monday morning from Kennedy Space Center in Florida, to deliver to the International Space Station a 2-billion-dollar, multinational particle detector known as the Alpha Magnetic Spectrometer (AMS).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.

SAN FRANCISCO, May 25 (Xinhua) -- Micro-blogging service Twitter on Wednesday confirmed that it has bought TweetDeck, a London-based startup that develops application to help people organize information posted on Twitter."Today, we're pleased to announce that the TweetDeck team has joined Twitter," Dick Costolo, Twitter's chief executive officer (CEO), said in a blog post."This acquisition is an important step forward for us. TweetDeck provides brands, publishers, marketers and others with a powerful platform to track all the real-time conversations they care about," he added.Founded in 2008, TweetDeck now has a team of 15 and offers a real-time application that allows users to monitor abundance of information from social media services including Twitter in a single concise view."Change may well be inevitable, but we remain the same team, staying in London, with the same focus and products, and now with the support and resources to allow us to grow and take on even bigger challenges," Iain Dodsworth, founder and CEO of TweetDeck, noted in a separate blog post.The deal is a defensive move for Twitter aimed at preventing TweetDeck from being purchased by rivals, some analysts said.Financial terms of the transaction were not disclosed, but technology blog site TechCrunch and other U.S. media reported that Twitter paid 40 million to 50 million U.S. dollars.

BEIJING, May 12 (Xinhuanet) -- Italian archaeologists are digging the remains of Lisa Gherardini, a 16th-century woman who is widely believed to be the model for the famous portrait Mona Lisa, AFP reported on Wednesday.The team of historians say they will try to find the remains using geo-radar equipment and then try to re-create a likeness of what the woman, Lisa Gherardini, would have looked like to compare her to Leonardo Da Vinci's Mona Lisa.Gherardini (1479-1542), also known by her married name as Lisa del Giocondo, was the wife of a Florentine silk merchant and is widely believed to have been the model for the  portrait that now hangs in the Louvre in Paris.But the issue has never been settled definitively and mystery still shrouds the model's enigmatic expression and other details of the portrait.

NICOSIA, March 8 (Xinhua) -- Cypriot geneticists have reported a non-invasive Down's Syndrome test that could possibly replace the risky amniocentesis procedure now in use.A team of researchers at the Cyprus Institute of Neurology and Genetics reported in Nature Medicine journal that the new test involves only a small quantity of blood taken from the mother's arm, which is analyzed to detect DNA differences between the mother and the fetus.Philippos Patsalis, medical director of the institute, said Tuesday the new method eliminates dangers involved with amniocentesis testing, which involves sampling amniotic fluid by inserting a hollow needle into the mother's uterus.At present, only women belonging to high risk groups, including older women, are tested for Down's Syndrome, which is the most common genetic cause of mental retardation.Patsalis, who led the study, said the new method would be made available to the medical community after clinical tests are concluded world-wide on 1,000 women within two years.

HARARE, Feb. 11 (Xinhua) -- Chinese Foreign Minister Yang Jiechi on Friday called on the West to lift sanctions they imposed on Zimbabwe while Zimbabwean President Robert Mugabe applauded the Asian giant for its continued political and economic support.Addressing journalists soon after meeting Zimbabwe President Mugabe, Yang, who is on a two-day visit, said Zimbabweans and other African people have a right to choose their own development path."We believe there should be the lifting of sanctions by certain countries. We think that is the voice of the Zimbabwean people and that is also the view of all the parties concerned here in Zimbabwe," Yang said, adding that no country has a right to dictate to another."We believe all nations should respect each others sovereignty and territorial integrity," he said."China believes that Africans have the right to choose their own way of development as they are the masters of the African continent. All others are just guests," he said.Yang said that China appreciates assistance from Africa and would also continue to reciprocate the support.Addressing the Chinese delegation earlier, Zimbabwean President Mugabe said the West continues to persecute Zimbabwe through sanctions for the decision the county took to empower its people through land.He said the imposition of sanctions was despite the fact that Zimbabwe and Britain had agreed that the former would redistribute the land while the latter would compensate affected farmers."The Western countries have imposed sanctions on us for taking our land although we had discussed this in 1979. That is what started the problem," Mugabe said.Mugabe said Britain had since turned to political reasons such as human rights, democracy and rule of law to justify continued sanctions imposed on Zimbabwe.He applauded continued cooperation between China and Zimbabwe which dates back to the struggle for independence.Meanwhile, China extended a 50 million yuan (7.5 million U.S. dollars) grant to Zimbabwe.Yang and his Zimbabwean counterpart Simbarashe Mumbengegwi signed the agreement on behalf of their countries.In his meeting with Mumbengegwi, Yang who described Zimbabwe as a "brother" said the two countries had identified areas for further cooperation such as infrastructure, agriculture, water conversation and personnel training.

来源：资阳报