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SHANGHAI, Feb. 19 (Xinhua) -- Shanghai and several other Chinese cities have moved to restrict home purchases in a bid to deflate bubbles in the real estate market.The rules, which were revealed by Shanghai's Housing Guarantee and Administration Bureau on Saturday, prohibits new home purchases from locally-registered families who have owned two or more homes and non-local registered families who have owned at least one home.Additionally, non-Shanghai registered families who have no documents certifying they have paid for social security or income tax in the city for one year are banned from buying property.Sales of commercial homes fell 42.4 percent year on year in Shanghai in 2010 as earlier measures to curb the speculative demand in the real estate market took effect.Despite the fall in sales volume, the average price of new commercial homes rose by 7.6 percent to 20,995 yuan (3,200 U.S. dollars) per square meter last year.On the same day, authorities in the eastern city of Nanjing and the northeastern city of Harbin rolled out similar purchase restrictions.On Wednesday, the Beijing municipal government unveiled even tougher measures to prohibit home purchases from non-local registered families who have no proof of social security or income tax payments in the Chinese capital for five straight years.The purchase limits came after the State Council, China's Cabinet, ordered late last month that cities where home prices are skyrocketing must implement strict measures to restrict home purchases over a period of time.The State Council also said that local governments will be responsible for the stable and healthy growth of property markets and are required to publicize, before the end of March, the annual "controlled" price targets for new homes.China has implemented a series of measures since last year, which includes higher down payment and lending rates, and bans on mortgage loans for third homes, to rein in the rapid rise in housing prices.Soaring prices have become a major concern for urban Chinese residents as more homes turn unaffordable. In fact, home prices in some major cities such as Beijing have more than doubled over the past two years.

WASHINGTON, May 27 (Xinhua) -- Two U.S. astronauts conducted the fourth and final scheduled spacewalks for space shuttle Endeavour 's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) announced.The seven-hour, 24-minute spacewalk completed by Mike Fincke and Greg Chamitoff at 7:39 a.m. EDT (1139 GMT) was the final spacewalk conducted by space shuttle astronauts before NASA turns over Endeavour and sister ships Discovery and Atlantis to museums. Space station crew will continue to make spacewalks for maintenance and repair tasks.At 5:02 a.m. (0902 GMT), Fincke and Chamitoff surpassed the 1, 000th hour astronauts and cosmonauts have spent spacewalking in support of space station assembly and maintenance. The milestone occurred four hours and 47 minutes into the spacewalk, the 159th in support of station assembly and maintenance, totaling 1,002 hours, 37 minutes.The astronauts completed their mission to stow the 50-foot-long boom on the station truss and work on some new installations to extend the space station's robotic arm. After that, shuttle commander Mark Kelly called Mission Control in Houston to mark the milestone -- after 12 years of efforts."Space station assembly is complete," Kelly said.It was the 248th spacewalk U.S. astronauts have conducted and the 118th from space station airlocks. Landing is scheduled for 2: 32 a.m. EDT (0632 GMT) on Wednesday at the Kennedy Space Center in Florida. Shuttle Atlantis is targeted to launch on July 8 for space shuttle's final flight.Endeavour lifted off on May 16 from the 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.NASA's 30-year-old shuttle program is ending due to high operating costs. The Obama administration wants to spur private companies to get into the space taxi business, freeing NASA to focus on deep space exploration and new technology development.When the U.S. space shuttle program officially ends later this year, the Russian space program's Soyuz capsule will be the only method for transporting astronauts to and from the station.

NEW DELHI, March 5 (Xinhua) -- Doctors in India have claimed to have successfully performed a rare robotic heart surgery on a 23- year-old person at a hospital in the southern Indian city of Chennai, local media reported Saturday.Dr. R. Ravi Kumar, the Director of the Institute of Cardiovascular Disease at the Chettinad Health City, said the robotically assisted procedure involved replacing both the mitral and the aortal valve simultaneously.The surgery carried out on D. Vijayakanth, an auto driver from Vellore, was done by a three armed robot, took four hours and cost 225,000 rupees (4,500 U.S. dollars)."The best part about using a robot in cardiac surgery is that the patient's heart need not be opened and the surgery can be done using a small 4cm incision. This is not possible with normal surgeries without a robot," Dr Ravi Kumar was quoted by local daily The Times of India as saying.Robotic surgery, which is fairly new in the country, can be used for a gamut of medical procedures, said Dr Ravi Kumar."It requires a lot of precision and intense training because though the robotic hands do the surgery, it has to be controlled by a trained surgeon. One of the biggest disadvantages is the lack of sensory perception which is there when the surgeon actually does the surgery himself," he said.

JOHANNESBURG, March 23 (Xinhua) -- Cervical cancer ranks as the second most frequent cancer among women in South Africa.Recent information from a World Health Organization (WHO) and ICO Information Center on Human Papilloma virus (HPV) and Cervical Cancer 2010 report shows that 16.84 million South African women aged 15 years and older are at risk of developing cervical cancer.Current estimates indicate that every year 5,743 women are diagnosed with cervical cancer and more than 3,000 die from the disease.About 21 percent of women in the general South African population are estimated to harbor cervical HPV infection at any given time, and 62.8 percent of invasive cervical cancers are attributed to HPV subtypes 16 or 18."Concern is growing as there appears to be an increasing epidemic of papillomavirus-induced disease involving not only the cervix but elsewhere in the female genital tract and anogenital region," said Professor Martin Hale, head of the Department of Anatomical Pathology at the University of the Witwatersrand (Wits) in Johannesburg and the National Health Laboratory Service.The South African population and people from Africa in general have high incidences of the HPV subtypes 16 or 18 according to Professor Hale. He is not entirely sure why but is of the opinion that the infection rate can be lowered."The common theory is that HPV is transmitted through sexual intercourse. If treated like a sexual disease and the necessary precautions are taken during sex the infection rate can be lowered, " Hale told Xinhua in an interview on Wednesday.HPV is also exacerbated as a result of the HIV pandemic and cause a rapid progression of premalignant dysplasia to invasive cancer in HIV positive patients.Hale believes the limited access to information and resources make it easy for the condition to thrive.However, according to Hale, a debate is still raging on how, to whom and whether the vaccine should be administered.Black women are at higher risk of contracting HPV and subsequent cervical cancer. Other risk factors that increase susceptibility include age of first intercourse, the number of children per woman, and a weakened immune system, to name a few."To avoid getting cervical cancer get the vaccine against HPV 16 and 18 infection before starting to be sexually active, have protected sex and go for regular screenings," he told Xinhua.