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BEIJING, Nov. 7 (Xinhua) -- Chinese President Hu Jintao will meet with his U.S. counterpart, Barack Obama, at the 19th Asia-Pacific Economic Cooperation (APEC) Informal Leadership Meeting, said China's Assistant Foreign Minister, Wu Hailong, on Monday.He said the APEC summit will be held from Nov. 12 to 13 in Hawaii, with the theme of "seamless regional economy."According to Wu, speaking at a Foreign Ministry media briefing, Hu will attend the "APEC Leaders' Informal Meeting, Leaders' Dialogue with Representatives from APEC Business Advisory Council, and APEC CEO Summit."China hopes the APEC members will implement the economic growth strategy agreed last year, striving to achieve a balanced, inclusive, sustainable, innovative and safe economic growth, said Wu.China expects the APEC members to comprehensively promote regional trade and investment liberalization, he said, adding that all member states should fulfill their commitments and oppose all forms of trade protectionism.Wu said APEC should strengthen economic and technical cooperation to enhance the development ability of the developing members, and therefore to achieve common prosperity."APEC members generally hold positive attitudes toward U.S. proposals in various fields such as green growth, innovation policy. But some of the U.S.'s expected outcomes are beyond the capacity of the developing members, and they have expressed their difficulties and concerns," Wu said."However, all parties hope this meeting will achieve balanced and practical results".Assistant Commerce Minister Yu Jianhua said major topics to be discussed at the summit would include pushing forward the Doha Round negotiations, opposing trade protectionism, promoting green growth, and cooperation on developing regulations to govern emerging industries.He said China hopes the meeting will further promote the liberalization and facilitation of trade and investment in the Asia-Pacific region, push forward economic and technology cooperation, support multilateral trade systems, oppose trade protectionism, so as to inject vitality into world economic recovery and growth.On safeguarding the multilateral trade system, Yu said the decade-long Doha round talks have entered a critical period and the summit should be a strong voice for the early completion of the talks as well as joint resistance against trade protectionism.He said the APEC members should make joint efforts to remove discriminatory trade restrictions on high-tech products, and promote technology transfer and cooperation, so as to enable all members to benefit.On green growth, he said as APEC members differ sharply in their basis, conditions and levels in developing a green economy, the liberalization of environmental products and services should be pushed steadily.He also called on the developed economies to enhance capital and technical support for the developing economies, helping them in achieving their potential for sustainable development.

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.

BEIJING, Jan. 14 (Xinhua) -- China and member countries of the Association of Southeast Asian Nations (ASEAN) on Saturday held a meeting of senior officials on the implementation of the Declaration on the Conduct of Parties in South China Sea.All the participants had in-depth discussion and reached a series of consensus, said a press release posted on the Foreign Ministry's official website (www.fmprc.gov.cn).The meeting concluded that the general situation of South China Sea is peaceful and stable, and appreciated the positive efforts from all concerned sides.The meeting regarded 2011 as a fruitful year with positive progress made in implementing the declaration, and reached consensus on the future works, including to speed up specific cooperation projects, and to host seminars on maritime disaster-relief, environment, rescue and biology research.All the parties agreed to set up experts committees on maritime scientific research, environmental protection, security and rescue, and on the crackdown on cross-border crimes, and to better utilize the China-ASEAN fund on maritime cooperation.

WASHINGTON, Dec. 5 (Xinhua) -- NASA's Kepler mission has confirmed its first planet in the "habitable zone," a region where liquid water could exist on a planet's surface, the U.S. space agency announced on Monday.The newly-confirmed planet, Kepler-22b, is the smallest yet found to orbit in the middle of the habitable zone of a star similar to Sun. The planet is about 2.4 times the radius of Earth. Scientists don't yet know if Kepler-22b has a predominantly rocky, gaseous or liquid composition, but its discovery is a step closer to finding Earth-like planets.Previous research hinted at the existence of near-Earth-size planets in habitable zones, but clear confirmation proved elusive. Two other small planets orbiting stars smaller and cooler than Sun recently were confirmed on the very edges of the habitable zone, with orbits more closely resembling those of Venus and Mars.Kepler-22's star is a bit smaller than our sun, so its habitable zone is slightly closer in. The diagram shows an artist's rendering of the planet comfortably orbiting within the habitable zone, similar to where Earth circles the sun. Kepler-22b has a yearly orbit of 289 days. The planet is the smallest known to orbit in the middle of the habitable zone of a sun-like star. It's about 2.4 times the size of Earth."This is a major milestone on the road to finding Earth's twin, " said Douglas Hudgins, Kepler program scientist at the NASA Headquarters in Washington. "Kepler's results continue to demonstrate the importance of NASA's science missions, which aim to answer some of the biggest questions about our place in the universe."Kepler discovers planets and planet candidates by measuring dips in the brightness of more than 150,000 stars to search for planets that cross in front, or "transit," the stars. Kepler requires at least three transits to verify a signal as a planet."Fortune smiled upon us with the detection of this planet," said William Borucki, Kepler principal investigator at the NASA Ames Research Center who led the team that discovered Kepler-22b. "The first transit was captured just three days after we declared the spacecraft operationally ready. We witnessed the defining third transit over the 2010 holiday season."The Kepler science team uses ground-based telescopes and the Spitzer Space Telescope to review observations on planet candidates the spacecraft finds. The star field that Kepler observes in the constellations Cygnus and Lyra can only be seen from ground-based observatories in spring through early fall. The data from these other observations help determine which candidates can be validated as planets.Kepler-22b is located 600 light years away. While the planet is larger than Earth, its orbit of 290 days around a Sun-like star resembles that of Earth. The planet's host star belongs to the same class as Sun, called G-type, although it is slightly smaller and cooler.Of the 54 habitable-zone planet candidates reported in February 2011, Kepler-22b is the first to be confirmed. This finding will be published in The Astrophysical Journal.