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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.

BEIJING, Nov. 17 (Xinhua) -- The Beijing municipal government Thursday launched a news release platform on Sina's weibo.com, China's popular Twitter-like microblogging service.Twenty municipal government agencies will post newly-unveiled policies and regulations, work developments, and information of news conferences on the joint microblog account, said Wang Hui, head of the Beijing municipal government's information office.The government departments will also timely answer hot topics and social concerns, Wang said.Many government departments have their own microblog accounts. The municipal public security bureau, for example, opened its microblog in August last year and now has over 1.8 million followers."I'm happy I can communicate directly with the government. And I hope my viewpoints and suggestions can get attention," said weibo user 1910060523.Many, however, question the move. "Is it really the case that everything can be said here and the government will read the comments and give responses?" said another user.Wang Hui said, "We are not just making a show. We shall be sincere to answer public's concerns over hot topics."

BEIJING, Oct. 13 (Xinhuanet) -- Tyrannosaurus rex dinosaur, the giant prehistoric predator, was even bigger and heavier than it was estimated previously, a new study found.The finding was contained in a study published Wednesday in the scientific journal PLoS ONE.Using three-dimension scanning and computer modeling, researchers analyzed five skeleton fossils of T. rex dinosaur, including "Sue", the largest and most complete T. rex specimen ever found.The analysis tipped the scale of "Sue" at 9 ton, some 30 percent more than it was expected."At their fastest, in their teenage years, they were putting on 11 pounds or 5 kilograms a day," said John Hutchinson of the Royal Veterinary College in London, who co-led the study.The larger body mass indicated the better agility and the stronger lower-leg muscles of the ancient monster, said the researcher."Sue" could have a top speed of about 10-25 miles per hour when it ran on the Great Plains of North America 67 million years ago, Hutchinson suggested.

WINDHOEK, Nov. 29 (Xinhua) -- An agreement on Economic and Technical Co-operation was signed here on Tuesday between the Chinese and Namibian governments.The agreement was signed after Namibian Cabinet ministers and officials from various ministries held talks with Chinese State Councilor Liu Yandong, who arrived in Namibia on Tuesday for a three-day official visit.Minister of Presidential Affairs Albert Kawana, who is the Acting Director-General (DG) of the National Planning Commission (NPC), and Ambassador of China to Namibia Wei Ruixing signed the agreement.The two also exchanged letters on the provision of office supplies and solar energy equipment to the Namibian government by the Chinese government.During their talks, Liu highly spoke of the steady, healthy development of the relations between the two countries.She said the substantial cooperation have been obtained on agriculture, mining and human resources. Great achievements have been made in exchanges of culture and education.The state councilor also said China would like to work together with all African countries including Namibia to promote the development of people-to-people exchanges.Namibia's Deputy Prime Minister Marco Hausiku proposed future cooperation with China in visual and performing arts.He said the Directorate of Arts in the Ministry of Youth, National Service, Sports and Culture is keen to develop future relationships that will lead to bilateral exchanges in arts education, assistance in the development of small arts businesses, the promotion of arts through the exchange of information on arts and participation in events in the respective countries."This can be achieved through the development of ties between the relevant institutions responsible for these areas, such as the line ministries responsible for arts, arts education colleges, performance theaters, art galleries and organizers of events such as festivals and expos," he noted.He also encouraged exchanges between musicians in the sphere of composition, conducting, and instrumental playing in both folklore and symphonic genres, and therefore invited China in the development of Namibia's National Symphony Orchestra.Hausiku also proposed for scholarships in information and communication technology (ICT), particularly policy development and regulatory framework, and linkages with Chinese ICT institutions for exchange purposes.

WASHINGTON, Nov. 16 (Xinhua) -- Supervised exercise was shown to be more effective than stenting or medication for improved walking ability in patients with peripheral artery disease (PAD), according to a U.S. study reported Wednesday at the 2011 American Heart Association Scientific Sessions meeting.The research group reported that of 111 patients studied in the randomized trial, the most effective treatment proved to be supervised exercise based on the results of a treadmill test taken at baseline and again at six months. Patients who were in the supervised exercise group improved by a mean of 4.6 minutes in the treadmill test, while the group who received stents improved by a mean of 2.5 minutes. However, researchers found that self-reported quality of life measurements proved to be higher in the group that received stents, even though their ability to walk did not improve as greatly as the group that received supervised exercise rehabilitation.The findings were published in the November issue of the journal Circulation. The researchers believe that more studies are necessary, although supervised exercise may be an effective treatment recommended for PAD patients with claudication.PAD is a condition in which plaque builds up in the arteries and affects blood flow, especially to the legs. It is estimated that between 10 and 12 million people suffer from PAD in the United States. One symptom of PAD is known as claudication, a painful cramping of the leg muscles that limits the patient's ability to walk. It affects nearly 2 million people who suffer from PAD, and results in a sedentary lifestyle and poor quality of life.Current U.S. guidelines for the treatment of claudication include pharmacotherapy, supervised exercise rehabilitation and lower extremity revascularization using stents.