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BEIJING, Nov. 30 (Xinhuanet) -- Heading football frequently may cause brain damage leading to subtle but serious declines in thinking and coordination skills, a new study suggested as quoted by media reports Wednesday.Researchers used an advanced MRI (Magnetic Resonance Imaging) technique to analyze changes in brain white matter of 32 adult amateur soccer players who head balls 436 times a year on average.The study found players who head football quite frequently -- with 1,000 or more a year -- showed abnormalities similar to traumatic brain injuries suffered in car accidents."This is the first study to look at the effects of heading on the brain using sophisticated diffusion tensor imaging," said Dr. Michael Lipton, a leading researcher and associate director of the Gruss Magnetic Resonance Research Center at the Albert Einstein College of Medicine in New York City."We found the real implication for players isn't from hitting headers once in a while, but repetitively, which can lead to degeneration of brain cells," he added.The researchers compared neurological images of study participants, whose average age was 31, and found those with the highest volume of headers had abnormalities in five areas of the brain, responsible for attention, memory, physical mobility and high-level visual functions.The findings come in the wake of mixed reports on the so-called "cognitive" consequences of frequently heading soccer balls at practice.Dr. Chris Koutures, a pediatrician and sports medicine specialist in Anaheim Hills, California, said the retrospective imaging study was fascinating, but needs more data to effectively determine safe header limits, especially for younger players.Dr. Lipton agreed neuropsychological damage from headers would be hard for a coach or physician to notice since cognitive problems develop gradually, and even players might not be aware of mild memory loss."We can't tell an individual today not to be heading a ball, but caution is a good thing," Lipton said. "We need more research for definitive answers and we have the advanced imaging tools to do it."

BEIJING, Oct. 20 (Xinhuanet) -- British scientists used bacteria and DNA to build basic components for digital devices in a new research, according to media reports, suggesting biological computers come closer to reality.Digital devices are based on logic gates, fundamental building blocks in silicon circuitry, said Professor Richard Kitney, leading researcher of the research published in the journal Nature Communications, "Without them, we could not process digital information."According to Science Daily, Professor Kitney and his colleagues from the Imperial College London replicated the building blocks using bacteria and DNA, forming biological logic gates, which paved the way for building more complex biological processors in the future.The researchers hoped biological computers can be applied to monitoring human health in the future.They believed that small biological processors, inserted in human bodies, could roam inside the bodies, monitor the health, and correct any problems they found.These biological logic gates are the most advanced created by scientists. But there is still a long way to go to apply them in reality, said Professor Kitney.

ADDIS ABABA, Dec. 1 (Xinhua) -- Marking the World AIDS Day on Thursday at the African Union (AU) headquarters in Addis Ababa, Ethiopia, Jean Ping, the AU Commission chairperson, said Africa should no longer see new generations with HIV infection.Through his representative, Ping called upon individual and collective action to contain mother to child transmission of HIV."We should act individually and collectively not only to prevent mother to child transmission but also to take care of the health of people living with the virus," said the chairperson.He also expressed commitment of the AU Commission to work with member states and pertinent bodies in the efforts made to HIV treatment and prevention.The World AIDS Day is commemorated this year under the theme "Zero Mother to Child Transmission", as world leaders who were gathered in New York for the 2011 United Nations (UN) High Level Meeting on AIDS in June, launched a Global Plan for significant strides towards eliminating new HIV infection among children by 2015 and keeping their mothers alive.Remarkable progress has been made so far, which is proof to realize the vision of zero new HIV infection, zero discrimination, and zero AIDS-related death (the three zeros), said UN Secretary General Ban Ki-moon in the message on the commemoration of the World AIDS Day.The secretary general revealed that the number of new infections has fallen by more than 20 percent since 1997, and new infections are continuing to decline in most parts of the world.In sub-Saharan Africa, the region most affected by the AIDS epidemic, HIV incidence has decreased in 22 countries, he said.According to UNAIDS, Ethiopia, Nigeria, South Africa, Zambia, and Zimbabwe are among the African countries where new HIV infections dropped significantly."Treatment has averted 2.5 million AIDS-related deaths since 1985. Last year alone, 700,000 lives were saved. Some 6.6 million people, nearly half those who need treatment in low and middle- income countries, are now receiving it," said Ban."Synergies between prevention and treatment are speeding up progress. But, to end AIDS, we need to deliver even greater results," said the secretary general.The UNAIDS says to get to the three zeros there must be acceleration on smart investments, capitalizing on scientific advancements and respecting human rights.Speaking at the AU headquarters on the commemoration of AIDS Day, Jan Beagle, deputy executive director of UNAIDS, underlined on the need to invest smartly to achieve the vision of the three zeros.There is a global target of 22 million U. S. dollars to 24 billion dollars to fund the AIDS response, which the UNAIDS says is a shared responsibility of all countries, donors and others."International assistance for the AIDS response has declined from 8.7 billion dollars in 2009 to 7.6 billion in 2010," said the Deputy Executive Director."We need to use new technology more effectively to reduce costs and demonstrate that we can deliver return on investment," she said.The AIDS movement is a movement for inclusiveness, equity and social justice, she said, adding that it has demonstrated global solidarity is possible to address multi-sectoral challenges.According to Abdoulie Janneh, executive secretary of the UN Economic Commission for Africa (ECA), an estimated 7,000 people get infected with HIV infections every day.The executive secretary highlighted ingenious and novel approaches in introducing new HIV/AIDS prevention strategies."A combination of the traditional initiatives and innovative initiatives can all be used to eliminate new HIV infections," said Janneh.

DOHA, Jan. 18 (Xinhua) -- Government should forge close ties with its people and listen to their opinions, Chinese Premier Wen Jiabao told reporters when asked his opinion on the situation in West Asia and North Africa.Wen said he made it clear during talks with Gulf states' leaders that government should respect the people's appeals in defending their own interests, for it is the people who created history. The responsibility for any government is to bring benefits to its own people, he added.In today's information-rich world, governments face more complexity in governing, and policy and planning coordination. In such circumstances, people's demands on government are also growing, Wen said.By keeping close ties with its people and listening to their opinions, governments could better develop the economy, improve people's livelihoods and bring benefits to them, he said.A responsible government should firmly and bravely shoulder its responsibility without pursuing special gains for itself, Wen said.

BEIJING, Dec. 17 (Xinhuanet) -- Restrictions on housing purchases in this city will continue next year without relaxation despite expected falls in property prices so far, local officials said on Friday. Even so, a property tax is unlikely to be put into effect for Beijing, they said.This year, the average price of commercial housing units stopped rising in July and so far has been lowered by 6.3 percent below what it had been in the same period last year. Of all of those who bought property in the 11 months of the year, 90 percent were first-time buyers, said an announcement released by the Beijing Municipal Commission of Housing and Urban-Rural Development."The restrictions worked well this year," said Wang Rongwu, with the commission, at a news conference on Friday morning. "But keeping the property market sound will require prolonged restrictions. Our specific goals for the purchase limits next year are still under discussion."Chen Baocun, deputy secretary-general of the National Real Estate Manager Alliance, said property developers will be able to cope with an extension of the limits."Developers didn't expect a sudden drop of the purchase restrictions next year," he said. "They are prepared to accept the policies for a longer time."In an attempt at tamping down property prices, the central government took time at the country's central economic work conference on Wednesday to encourage more cities to adopt a property tax. Such a tax is already being tried out in Shanghai and Chongqing.Beijing, though, is not likely to look seriously at adopting one, "unless it is otherwise required to by the central government", Wang said.

来源：资阳报