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LOS ANGELES, July 18 (Xinhua) -- At least 70 genetic mutations may be involved in the formation of colon cancer, far more than scientists previously thought, a new study suggests.The study by researchers at University of Texas (UT) Southwestern Medical Center contradicts previous thinking that only a few mutated genes may play a role in the development of colon cancer."The ways we've been treating patients up to now is to just go after one target when we should be going after three to four different pathways simultaneously," said Dr. Jerry W. Shay, vice chairman and professor of cell biology at UT Southwestern.The new study identified 65 candidate genes and at least five passenger genes whose mutations play significant roles in cancer development. Inactivating the function of any of these tumor- suppressing genes led to a key step in cancer development called anchorage-independent growth, meaning cells piled up on top of each other rather than aligning neatly.According to previous studies, there were 151 candidate genes and that mutations in just eight to 15 of them would lead to cancer. There were 700 other genes classified as passenger genes whose mutations were incidental to cancer growth.Current cancer treatments target just one or two known cancer- driver genes. While patients may get transient tumor burden reduction, almost universally tumor growth returns."Those numbers are dead wrong," Dr. Shay said, suggesting a new approach to colon cancer treatments targeting multiple genes and pathways simultaneously.The next step is further research to classify more accurately which genes drive cancer and which are merely passengers, the researchers said.Study findings were published in the July 2011 Cancer Research (Priority Reports).

BEIJING, July 26 (Xinhuanet) -- Hong Kong scientists announced that they had determined the idea of time travel is impossible by proving nothing can travel faster than the speed of light.The finding is contained in a study done by a research team from Hong Kong University of Science and Technology. The study was published Monday in a scientific journal "Physical Review Letters" in the United States."The study, which showed that single photons also obey the speed limit c, confirms Einstein's causality, that is, an effect cannot occur before its cause," the university said on its website."By showing that single photons cannot travel faster than the speed of light, our results bring a closure to the debate on the true speed of information carried by a single photon." said Professor Du Shengwang, who led the study.The possibility of time travel was raised 10 years ago when scientists discovered the optical pulses in some specific medium might propagate information in a faster-than-light speed."Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information." Du said.

OTTAWA, Sept. 29 (Xinhua) -- Climate change could cost Canada billions of dollars a year by the end of this decade, a government funded study group announced Thursday.The National Round Table on the Environment and the Economy said the cost of climate change for Canada could start at roughly 5 billion Canadian dollars per year in 2020 and increase to between 21 billion and 43 billion per year by 2050. Those costs would come from shoreline damage, public health problems, and disruptions to the economy.It also predicted a slight increase in deaths in major cities from heat and air pollution.The round table researchers estimated the cost of climate change is expected to be roughly 0.8 percent to 1.0 percent of GDP -- or 43 billion Canadian dollars a year -- by 2050, if the problem is allowed to worsen.But the report did not address possible benefits, such as reduced demand for hea

TAIPEI, Sept. 11 (Xinhua) - As the full moon emerged in the remote sky, families and friends, bringing their barbecue grills, meat, seafood and vegetables, gathered under the Dazhi Bridge nearby Jilong River, one of major barbecue sites for the Mid-Autumn Festival in Taipei.Many families came to the barbecue site as early as at 3 p.m. Sunday for preparation. A Taipei citizen surnamed Wu in his sixties brought all his 30 family members to the barbecue."Every year, our family come out for barbecue only at the occasion of Mid-Autumn Festival, because the festival is for family reunion," he said.He also brought some fireworks to celebrate the traditional Chinese festival.Together with Wu's family, hundreds of people gathered under the bridge for barbecue, an unique scene in Taiwan for the Mid-Autumn festival.Mooncakes are a traditional delicacy for the Mid-Autumn Festival, which falls on the fifteenth day of the eighth month on the lunar calendar, or Sept. 12 this year. The round mooncakes resemble the full moon, a symbol of family reunion in traditional Chinese culture as well as the major theme of the Mid-Autumn Festival.According to some local residents, in the 1980s several barbecue sauce companies competing for the market frequently organized fairs to promote barbecue-related products just before the Mid-Autumn festivals.Through the intensive promotion campaigns, barbecue eventually became a Mid-Autumn festival custom as important as eating mooncake in Taiwan.But mooncake and pineapple cake are still popular gifts for the traditional festival in Taiwan. Weeks ahead of the festival, the advertisements for different brands of mooncake and pineapple cake were carried on local newspapers.Between Ren'ai Road and Xinyi Road in downtown Taipei, there is a weekend flower market becoming one of the options for Taipei citizens to while off the Mid-Autumn Festival holiday.The flower market with 29-year history is in fact a parking lot during weekdays. But during the weekend, the 1.5-hectare area becomes one of the biggest flower markets in Taipei, with about 300 booths selling flowers and plants.A flower seller, surnamed Yang, said the number of buyers increased significantly on Saturday and Sunday, the first two days of the three-day Mid-Autumn Festival holiday and the sales rose by nearly 30 percent.The flower market also held an agricultural product fair on Sept. 10-12, on which tea, fruits and other agricultural products are sold.

CANBERRA, Aug. 29 (Xinhua) -- Alzheimer Australia on Monday released a GPS device for people with dementia, in a move to give them greater independence, while reducing the burden of missing person searches for police.The technology has been using in New South Wales of Australia, and is now available for people in state Victoria.The Safe2Walk locater can be worn by people with dementia on a lanyard around the neck or clipped onto a belt. Families can log- on to the connected website and see where the person is.The device updates the person's location every 60 seconds, reducing stress for carers so they know when a person with dementia might be wandering.It also works as a mobile phone, letting the person wearing the device to make instant calls to family.According to Alzheimer's Australia's research manager Jason Burton, the device aimed to stop vulnerable people getting lost, with research showing about 40 percent of people with dementia went missing at least once."In 99 percent of cases the carer has gone to pick them up, but there was one case where they couldn't and the police were able to contact us to get the exact GPS location of this person to rescue them," Burton told Herald Sun.A Victoria Police spokeswoman said while it could not endorse a specific product, if the device could alert carers when a person with dementia first became disorientated, the response could help avoid a large-scale police search.Mina Sapounakis, who's father has worn the Safe2Walk device, said it has given her family a sense of calm."We could go grocery shopping without stressing and rushing back home quickly to check on Dad," she said."There were a few times he had gone wandering and we were able to easily find him without having to call the police."The Safe2Walk GPS costs under 15 U.S. dollars a week for rent.