中山哪里治疗内痔好(中山青少年内痔医院) (今日更新中)

WASHINGTON, Dec. 7 (Xinhua) -- Drugs that affect the levels of an important brain protein involved in learning and memory reverse cellular changes in the brain seen during aging, according to an animal study published Wednesday in the Journal of Neuroscience. The findings could one day aid in the development of new drugs that enhance cognitive function in older adults.Aging-related memory loss is associated with the gradual deterioration of the structure and function of synapses (the connections between brain cells) in brain regions critical to learning and memory, such as the hippocampus.Recent studies suggested that histone acetylation, a chemical process that controls whether genes are turned on, affects this process. Specifically, it affects brain cells' ability to alter the strength and structure of their connections for information storage, a process known as synaptic plasticity, which is a cellular signature of memory.In the current study, Cui-Wei Xie, of the University of California, Los Angeles, and colleagues found that compared with younger rats, hippocampi from older rats have less brain-derived neurotrophic factor (BDNF) -- a protein that promotes synaptic plasticity -- and less histone acetylation of the Bdnf gene. By treating the hippocampal tissue from older animals with a drug that increased histone acetylation, they were able to restore BDNF production and synaptic plasticity to levels found in younger animals."These findings shed light on why synapses become less efficient and more vulnerable to impairment during aging," said Xie, who led the study. "Such knowledge could help develop new drugs for cognitive aging and aging-related neurodegenerative diseases, such as Alzheimer's disease," she added.

SHANGHAI, Dec. 9 (Xinhua) -- China's homegrown C919 large passenger plane has finished its preliminary development review and entered the development phase, a senior executive of Commercial Aircraft Corporation of China Ltd. (COMAC) in Shanghai said Friday.An expert team of the C919 project has approved the overall preliminary development review (PDR) of the passenger jet, said Jin Zhuanglong, president of the Shanghai-based COMAC.It is expected that the manufacturing process for the components of the prototype will begin by the end of 2011.COMAC signed a deal to sell 20 C919 large passenger planes to China Aircraft Leasing Company Limited (CALC) on Thursday.Up to now, the users of C919 large passenger planes have reached 10 and total orders amount to 215 units.COMAC said earlier it would develop both 168-seat and 156-seat models of the jet, with more models to be developed in the future.It also said that test flights for the single-aisle C919 were scheduled for 2014, and delivery is slated for 2016.

BRUSSELS, Nov. 7 (Xinhua) -- China and Europe should strive to strengthen their cooperation for a win-win outcome in this era of profound changes, said a senior Chinese official here on Monday.Liu Yunshan, a member of the Political Bureau of the Communist Party of China (CPC) Central Committee, made the remarks during his keynote speech at the opening ceremony of the China-Europe High-Level Political Party Forum.Chinese President Hu Jintao has expressed a readiness to work for world economic recovery and strong, balanced and sustainable growth at the G20 summit in Cannes, France last week, said Liu, who is also head of the Publicity Department of the CPC.Liu Yunshan(Front, 3rd,R), a member of the Political Bureau of the Communist Party of China (CPC) Central Committee, attends the opening ceremony of the China-Europe High-Level Political Party Forum in Brussels on Nov. 7, 2011. The forum kicked off in Brussels on Monday.The forum would carry on with discussions on the new possibility and new measures of cooperation between China and Europe, which would add new spurs to their relations, said the Chinese official.Liu called for more cooperation for a win-win result and mutual respect for cultural differences between China and Europe, as well as a common effort to build an inclusive and open international system to face up to global challenges.Noting that China and Europe are stepping into a new stage of development for their ties, Liu expressed hopes that both sides further enhance their strategic mutual trust, "respect each other's core interest and major concerns and observe each other's development from a more objective perspective."Efforts should be made to promote their cooperation in trade, finance, environment protection, high-tech and new energy, and China and Europe should also work to cultivate new growth possibilities for their economic and trade cooperation, he said.They should in the meanwhile expand people-to-people exchanges and take the chance of their intercultural dialogue year in 2012 to build on their friendship, he added.Leaders from the European political parties said the forum offered chance for a key high-level dialogue for the political parties in China and Europe, which would play an active role for the exchanges and comprehensive development of the relations between both sides.

BEIJING, Oct. 1 (Xinhua) -- China plans to decrease leprosy rates by 50 percent over the next 10 years, according to a joint plan to fight the infectious disease issued by the Ministry of Health and ten other ministerial-level institutions.The prevalence rate is targeted to be brought down to one case per 10,000 people by 2015. The rate will further shrink to one in every 100,000 people by 2020 in at least 98 percent of the country's counties, according to the plan.A total of 500,000 cases of leprosy have been reported and treated for free throughout the country since the founding of the People's Republic of China on Oct. 1, 1949.The number of leprosy cases has plummeted over the past 62 years, but the country still faces challenges in fighting the disease, the plan said.Leprosy, an infectious disease that has affected humanity for over 4,000 years, is primarily characterized by skin lesions and progressive physical debility, and can cause permanent nerve damage.Despite sustained efforts -- and considerable success -- in bringing the disease under control, leprosy is still a serious disease in some parts of China and people who have been cured of the disease continue to face discrimination.More than 1,700 new cases have been reported annually in the past five years. The provinces of Sichuan, Yunnan, Guizhou and Hunan and the Tibet Autonomous Region are most affected by the disease, according to the plan.

CANBERRA, Oct. 15 (Xinhua) -- Prisoners and health experts on Saturday told national broadcasting network ABC News that they are concerned of a looming HIV epidemic in Australia's prisons.The warning came following a test report undertaken in August showed that 40 percent of inmates at a correctional center in Canberra of Australia tested positive to Hepatitis C.According to the head of the Alcohol and Drug Service based at St Vincent's Hospital in Sydney, Alex Wodak, roughly 25 percent of Australia's prison population are injecting drugs, and he is concerned about the risk of an HIV explosion in Australia originating in prisons."Were Australia to have an epidemic of HIV beginning among people who inject drugs, it is almost certain that it would begin in one of our prisons. So we are very exposed to this risk," he told ABC News on Saturday.The Australia Capital Territory state government has proposed a trial prison needle exchange program in Canberra's correctional center, and Paul Cubitt, who currently works at the Alexander Maconochie Center in Canberra, said he has never seen so many syringes in a jail."Under a controlled regime it will actually take those needles that currently exist within a correctional center out of the environment, and prisoners will be more willing to use a clean item under a level of anonymity which then protects them and protects staff," he said.Meanwhile, The Community and Public Sector Union 's national secretary, Nadine Flood, agrees action must be taken to curb prisoner drug use.Dr Wodak noted that prison needle exchange programs have been operating overseas for over a decade with ten countries provide inmates with clean needles, and said it is shameful Australian prisons are lagging behind.

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