吉林早泄治疗多少钱?(吉林谁去医院治疗过前列腺炎) (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.

WASHINGTON, Jan. 2 (Xinhua) -- A systematic review of previous studies suggests that there may be a positive connection between physical activity and children's academic performance, according to a report published Monday in the Archives of Pediatrics & Adolescent Medicine.A group of scientists at the Vrije Universiteit (Free University) Medical Center in the Netherlands reviewed evidence on the relationship between physical activity and academic performance because of concerns that pressure to improve test scores may often mean more instructional time for classroom subjects with less time for physical activity.The authors identified 10 observational and four interventional studies for review, 12 of which were done in the United States, one in Canada and one in South Africa. Sample sizes ranged from 53 to about 12,000 participants between the ages of eight years and 18 years old. Follow-up varied from eight weeks to more than five years."According to the best-evidence synthesis, we found strong evidence of a significant positive relationship between physical activity and academic performance. The findings of one high-quality intervention study and one high-quality observational study suggest that being more physically active is positively related to improved academic performance in children," the report said.Background information in the article suggests that exercise may help cognition by increasing blood and oxygen flow to the brain, increasing levels of norepinephrine and endorphin to decrease stress and improve mood, and increasing growth factors that help create new nerve cells and support synaptic plasticity."More high-quality studies are needed on the dose-response relationship between physical activity and academic performance and on the explanatory mechanisms, using reliable and valid measurement instruments to assess this relationship accurately," the report concluded.

WELLINGTON, Jan. 2 (Xinhua) -- Chinese lanterns or life from a distant planet?New Zealand meteorologists said Monday they were opting for the former and other mundane explanations after being inundated with reports of UFOs since the start of the New Year.WeatherWatch.co.nz said it normally received "a handful" of eyewitness reports of meteors and lights in the sky, with about 10 reports on a busy day.However, since Sunday, the reports of "floating orbs" and UFOs had been flooding in from around the world at a rate of about 10 each hour.WeatherWatch.co.nz weather analyst Philip Duncan said the reports ranged from "normal meteor sightings to the strange and unusual.""Many people around the world have been outside celebrating the New Year," said Duncan in a statement."In the U.S., where most of the sightings came from, conditions were fairly mild and dry in many areas - so more people were outside to see things. Finally, it's 2012, the year the world is supposed to end according to the Mayans and it seems many are already worrying."One report from Ireland on the weather information company's website said, "At half ten new years eve as My mother and I were heading out of our house to go to town we both saw a strange orange pulsing light. My first guess was it could be a Chinese lantern but it was moving very fast in a perfect straight line. There was no wing and a lantern would sway a little and go up not straight across. The light then began to slow and slightly fade. After a few seconds it got brighter and sped up again until we lost sight of it behind our house. My mother saw the same thing around ten past twelve later that night in the same general area."The statement quoted other reports, including one from Spain: " My father and I saw them in Spain at 00:45 am, but there were 5 or 6 of them all in a vertical line quite close to the earth.""Susana" wrote from an unknown location, "yesterday around 1230 or 1245 there were some red brownish lights first i saw one of them and kind of got my attention and of the sudden there were a BUNCH of them i couldnt count them but i can say there were around 30 lights UFO'S OR CANDLE LIGHTS who knows all i know i saw those lights and were beautiful. Are we ready for the 2012? are we enough educated not to panic?"The WeatherWatch.co.nz statement branded the reports "2012 hysteria.""WeatherWatch.co.nz believes most people witnessed meteors, or shooting stars, Chinese lanterns (which appear as slow moving orange lights) and other normal aircraft such as helicopters and planes," it said.

SANTO DOMINGO, Sept. 30 (Xinhua) -- Haitian health authorities on Friday said the number of deaths caused by cholera increased to 6,435 in the Caribbean country since October 2010.The Haitian Health Ministry said the number of people infected with cholera almost reached half a million, although the ministry repeated the epidemic was decreasing.The report said 455,727 people had been treated due to cholera, and 242,205 had to be hospitalized.The western province of Artibonite suffered the plague most with 1,196 deaths. The southwest province of Nippes registered the smallest death toll of 181.Meanwhile, in the Haitian capital Port-au-Prince, 221 people have been killed since October 2010 when the epidemic first broke out in central Haiti.The epidemic is supposedly due to the spill of dregs from a Nepalese camp, which is part of the UN Stabilization Mission in Haiti (MINUSTAH).The Dominican Republic, a country neighboring the island country Haiti to the east, has also been suffering the disease since November 2010, which has killed at least 135 people there.

BEIJING, Dec. 25 (Xinhuanet) --  China is likely to test a new Internet protocol in the next few years in an attempt to further develop the country's Internet, senior officials from the State Council said on Friday.The country will put the Internet Protocol version 6 (IPv6)-based network into small-scale commercial pilot use by the end of 2013, and deploy and commercialize the IPv6-based network on a large scale between 2014 and 2015, according to a statement released after an executive meeting of the State Council that was presided over by Premier Wen Jiabao."The development of IPv6 is one of the most important tasks for China's Internet industry during the 12th Five-Year Plan period, from 2011 to 2015," said Hu Qiheng, director-general of the Internet Society of China.Analysts believe the transition from the latest Internet protocol, IPv4, to IPv6 is irreversible. This year, the pool of Internet addresses in IPv4 has come close to being tapped out, and the supply of domain names has run short.Compared with IPv4, IPv6 will offer more IP addresses and, for that reason, more devices will be able to connect directly to the Internet, said Microsoft Corp, one of the main technical supporters of IPv6.By 2010, China had about 278 million IPv4 addresses, according to data from the China Internet Network Information Center. That was far fewer than the 450 million Internet users who live in the country."This is the first time the government has issued a schedule for IPv6 development, and it will benefit the entire industry," said Chen Qi, deputy general manager of BII Group Holding Ltd, an IPv6 service provider based in Beijing.IPv6 will enable telecommunication operators to allocate more IP addresses to their clients and will probably bring more users to those operators, Chen said.Five Chinese telecommunications carriers, including China Telecom Corp and China Mobile Ltd, had established IPv6 networks as early as 2006, the New York Times reported.China will need "far too many" IPv6 addresses in the coming years, according to Paul Wilson, director general of Asia Pacific Network Information Center, an organization responsible for allocating IP addresses.The profits made by Chinese manufacturers of telecommunications equipment, such as Huawei Technologies Co Ltd and ZTE Corporation, will also increase, a result partly of a rise in the demand for routers and Internet switches, Chen said.China launched the construction of the next-generation Internet in 2003, featuring the IPv6 network as a key technology. Even though IPv6 has not been put into commercial use, Chinese universities are among the first institutions to connect to IPv6.

来源：资阳报