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RIYADH, Jan. 14 (Xinhua) -- China and Saudi Arabia pledged to work together to further expand all-around exchanges and cooperation as Chinese Premier Wen Jiabao Saturday unfolded his official visit to the Middle East kingdom.China and Saudi Arabia have treated each other as equals with respect and their cooperation has been fruitful since the establishment of diplomatic ties 22 years ago, said Wen while meeting Crown Prince Nayef bin Abdulaziz Al Saud.In recent years, despite the fact that international and regional situation became ever complicated and volatile, the two countries have strengthened high-level exchanges and promoted political mutual trust, said Wen, adding that the two have always demonstrated mutual understanding and support on issues involving their core interests and of major concern.Chinese Premier Wen Jiabao (L) holds talks with Saudi Arabia's Crown Prince Nayef bin Abdulaziz Al Saud in Riyadh, Saudi Arabia, Jan. 14, 2012.The premier said the decision to lift bilateral ties to an even higher level has shown the two nations' firm commitment to jointly face challenges and protect common interests as the world situation is undergoing profound changes.China would like to work with the Saudi side in deepening exchanges and cooperation in various aspects so as to benefit the two peoples and promote world peace and development, Wen added.He said the two sides should expand trade of crude oil and natural gas and energy-related cooperation as to deepen their energy partnership.Wen also asked the two countries to promote investment cooperation. The Chinese government encourages well-established Chinese companies to participate in Saudi Arabia's infrastructure construction such as railway, sea ports, electricity and telecommunications, he said.The two nations could also enhance security and law enforcement cooperation and promote people-to-people exchanges in areas like education and sports, as well as between the two nations' youths.Nayef said Saudi Arabia and China enjoy a time-honored history of exchanges, adding that the Saudi people have friendly feelings toward the Chinese people and expect even better bilateral ties.With joint efforts, bilateral ties have moved forward continuously with remarkable achievements in bilateral cooperation, he said, added that the partnership has bright prospects.Nayef said Saudi Arabia is willing to further boost political mutual trust with China, expand bilateral cooperation in economy and trade, energy, infrastructure, culture, press, and security, promote friendship between the two peoples, and lift bilateral ties to a higher level.Wen arrived here on Saturday evening after a short official visit to Nepal on the same day.

BEIJING, Oct. 18 (Xinhuanet) -- Autism can likely develop when low birth weight babies are combined with other factors such as environment and genetic predisposition, new research suggests.Researchers from the University of Pennsylvania School of Nursing and School of Medicine identified 1,105 children who weighed less than 2,000 grams at birth between Oct. 1, 1984, and July 3, 1989.Sixteen years later, researchers were able to reach 623 of those children, and used a questionnaire to screen them for autism spectrum disorders.When 189 of the children turned 21 years old, 60 percent of those who screened positive for an autism spectrum disorder, and 24 percent of those who screened negative with the condition. All in all, the rate of autism spectrum disorders among the study participants with low birth weights was five times higher than the general.Autism spectrum disorder makes people have difficulty communicating, difficulty interacting in social situations, and restrictive or repetitive interests, said study co-author Jennifer Pinto-Martin, a researcher in the University.Those with mild autism spectrum disorders, "may only want to talk about one subject," Pinto-Martin said. "They're perfectly functional. They can go to college. They can hold a job." Premature babies are often born with low birth weights, though full-term babies can also have the condition. The research suggests a need not only for better prenatal care to reduce the number of premature babies, but also a need for early diagnosis and intervention for people with autism.

ALMATY, Nov. 4 (Xinhua) -- Kazakhstan's Center for Prevention and Control of AIDS said Friday that the country had 17,266 registered HIV carriers as of Oct. 1,compared with 15,908 as of Feb. 1, 2010.Of the HIV-positive people, 1,432 were diagnosed with AIDS while 1,110 people carrying the virus AIDS have died, the center said.Last year, it said, a total of 1,969 new HIV cases were reported in the country.

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.

SAN FRANCISCO, Oct. 14 (Xinhua) -- Google on Friday announced to shut down the highly-controversial social networking product Google Buzz, along with several other services in the coming weeks.On the company's official blog, Google announced the death penalty to its code search engine, Buzz, Jaiku which let users send updates to friends, the Google personalized homepage feature iGoogle, and the University Research Program for Google Search.The shut-downs came as part of Google's housecleaning effort announced in early September, in which the company said it will shut down a number of products and merging others into existing products as features."Changing the world takes focus on the future, and honesty about the past. We learned a lot from products like Buzz, and are putting that learning to work every day in our vision for products like Google+. Our users expect great things from us; today's announcements let us focus even more on giving them something truly awesome," said Google in the blog post.Google Buzz, a social networking and messaging tool integrated into Gmail service, has been widely criticized for privacy concerns and held back the search giant from expanding its businesses to the social networking space.After Buzz, Google launched Google+ in June, which has been receiving a good response and passed the 40 million user mark, the company's chief executive officer Larry Page said Thursday.