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WELLINGTON, May 24 (Xinhua) -- New Zealand researchers have found a way to stop the growth of certain cancer tumors by " silencing" a group of PAX genes, members of a small family of genes that play important roles in embryonic development, but also allow cancer cells to grow and divide in adult tissue.In an article published in UK medical journal Oncogene, Otago University Professor Michael Eccles and colleagues revealed how they used the PAX8 gene to kill cancer cells.After detecting high levels of PAX8 protein in the majority of kidney, ovarian and thyroid cancers they studied, the researchers used molecular techniques to silence the PAX8 gene in several cancer cell lines."We found that these PAX8-depleted cancer cells ceased growing and dividing. The cells were essentially stopped in their tracks through the failure of multiple mechanisms and pathways crucial to their cell division cycle. They then entered into a state called senescence in which they no longer divided, and after that they ultimately died," Eccles said in a statement from the university Tuesday.The findings suggested that PAX8 could be a good target for the development of new cancer therapies, he said."Any resulting drugs would be a long way down the road, but in the meantime this research helps confirm that a focus on PAX genes may prove to be a fruitful line of attack against a number of cancers," he said.The research was supported by grants from the Health Research Council of New Zealand. It formed the main piece of work carried out by Otago doctoral graduate Caiyun (Grace) Li, now a postdoctoral fellow at Stanford University. Study co-authors also included Professor Antony Braithwaite and master's student Jen Nyman.In 2003, research led by Eccles discovered that proteins from one or more of the nine PAX genes were present in many common cancers. They found that "silencing" the gene expression of PAX2 in ovarian and bladder cancer cells, and of PAX3 in melanoma, led to the rapid death of the cells.

SAN FRANCISCO, May 11 (Xinhua) -- Google on Wednesday introduced a series of notebook computers based on its Chrome operating system, stepping up its competition against Microsoft.Google unveiled the "Chromebook" at its annual developers conference in San Francisco, saying that the new devices, made by Acer and Samsung Electronics, will go on sale on June 15 in the United States and six European countries.Google said Chromebooks can boot in 8 seconds and its security system makes it require no virus protection. Applications, documents and setting will be stored in "the cloud," which enables users to have same experience after logging into another Chromebook. The system will get updated automatically with no update prompts.Acer's Chromebook will start at 349 U.S. dollars and Samsung's product will be priced at 429 dollars for its WiFi model and 499 dollars for 3G connectivity. The devices will be available online in the United States through Amazon.com and Best Buy's online store.Google on Wednesday also announced Chromebooks for Business and Education, a subscription service including Chromebooks and a cloud management console to remotely administer and manage users, devices applications and policies.Google said it will directly handle the business and education orders. The monthly fee will be 28 dollars per user for businesses and 20 dollars per user for educational customers.The Chrome operating system, announced in July 2009, is designed to work exclusively with web applications, with its work based on Google's Chrome web browser.On Wednesday's conference, Google said the Chrome web browser now has 160 million active users, compared to 70 million last May.

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.

LOS ANGELES, March 5 (Xinhua) -- Law enforcement agencies are now using smart phones to track and arrest graffiti vandals in Los Angeles, a newspaper report said on Saturday.The graffiti-tracking program, spearheaded by the Tracking and Automated Graffiti Removal System, or TAGRS, allows graffiti- cleaning crews equipped with smart phones to photograph the markings and upload them to a Los Angeles Police Department (LAPD) database, the Los Angeles Times said.The photos are used to gather evidence for prosecution and restitution, the paper quoted city officials as saying.Once the graffiti suspects' identities are discovered, the information is added to the TAGRS database and may eventually uncover incidents involving the same suspects, the paper said.The LAPD launched a pilot project in 2009 in Van Nuys near Los Angeles, modeling its version on one run by the Orange County Sheriff's Department, according to the report.The program is now anchored at four LAPD stations, Van Nuys, Hollenbeck, Central and Harbor, said Mayor Antonio Villaraigosa's spokeswoman Casey Hernandez.Los Angeles spends about 10 million dollars a year cleaning up graffiti, Hernandez said.

WASHINGTON, March 9 (Xinhua) -- U.S. space shuttle Discovery landed safely at the Kennedy Space Center in Florida on Wednesday, ending its nearly 27-year flying career as the world's most- traveled spaceship.According to NASA, Discovery touched down at 11:57 a.m. EST ( 1657 GMT) after a 13-day resupply mission to the International Space Station (ISS)."For the final time: wheels stop," Discovery's commander Steven Lindsey called out as the shuttle rolled to a full stop.Discovery lifted off on Feb. 24 from the Kennedy Center and arrived at the space station on Feb. 26.During the mission, the astronauts installed a spare closet module on the space station, completed some important repairs and delivered the first humanoid robot, though it will need more time to be assembled and made operational.The 330-pound R2 consists of a head and a torso with two arms and two hands. Once it is unpacked -- likely several months after its arrival at the station -- it will initially be operated inside the Destiny laboratory for operational testing, but over time both its territory and its applications could expand.Aboard the station, its primary job for now is teaching engineers how dexterous robots behave in space. However, the hope is that through upgrades and advancements, it could one day venture outside the station to help spacewalkers make repairs or additions to the station or perform scientific work.