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BEIJING, Oct. 7 (Xinhua) -- Chinese scientists are developing new methods like spraying or dropping hepatitis vaccines into people's noses to replace traditional injections, according to a leading expert on immunology.Such researches were sponsored by a key national science project, according to Wen Yumei, an academician of the Chinese Academy of Engineering, also the chairwoman of the 14th International Symposium on Viral Hepatitis and Liver Disease, which is scheduled to be held in Shanghai next July.At a press conference held here Friday for the symposium, experts believed that broad-coverage inoculations is an effective way in facilitating the country's goal in controlling Hepatitis B.China's Ministry of Health has also credited its national immunization program for having protected about 80 million people from being infected with the Hepatitis B virus (HBV) in the 19 years after 1992.Recent report showed that about 93 million Chinese are HBV carriers, accounting for more than a quarter of the world's total.

MINSK, Oct. 11 (Xinhua) -- Chinese telecommunications firm Huawei on Tuesday showcased its latest solutions in mobile broadband at an exhibition in Belarus.Focusing on the possibilities of expanding the capacity of mobile operators' networks, the solutions propose to use fourth-generation network standards and introduce elements of intelligent network resources.The exhibition also presented the latest generation of radios, transportation equipment, and terminal solutions."Mobile traffic is constantly increasing, but profit is not growing so fast - about 20 to 30 percent," Xu Zhidong, general director of Bel Huawei Technologies, said during the opening ceremony of the exhibition."We need to provide more services. In addition, the market should be presented by more terminal devices. The decisions, which are displayed at the exposition, will not only increase the volume of Internet traffic, but also increase average profit per subscriber," he added.Lu Guicheng, China's ambassador to Belarus, said Huawei has seen a very successful development, including in the Belarussian market.Huawei, China's largest telecommunications company, which began investing in Belarus in 2003, signed an agreement with the Eastern European nation last month to set up a network technology training center in Belarus for telecommunications technology research and training.It also agreed last month to help more than 300 Belarussian companies with their information technology construction over the next four years.

WASHINGTON, Nov. 14 (Xinhua) -- Vitamin D levels are significantly lower in patients with recurrent inflammatory spinal cord disease, according to a study published online Monday in Archives of Neurology.Vitamin D is a steroid vitamin that promotes the intestinal absorption and metabolism of calcium and phosphorus. In recent years, low levels of vitamin D have been linked to a variety of autoimmune conditions, including multiple sclerosis (MS). However, the importance of vitamin D in monophasic or recurrent non-MS spinal cord diseases including transverse myelitis and neuromyelitis optica is unknown, according to background information in the article.Transverse myelitis (TM) is a disease of the spinal cord in which there is involvement of the myelin sheath that protects nerve fibers; symptoms include back pain and weakness in the legs. Neuromyelitis optica (NMO) is a disease of the central nervous system that affects the optic nerves and spinal cord.Maureen Mealy, of Johns Hopkins University and colleagues investigated the association between low serum vitamin D levels and recurrent spinal cord disease. They analyzed data on vitamin D levels among 77 patients with monophasic (having only one phase or stage) and recurrent inflammatory diseases of the spinal cord, adjusting for season, age, sex, and race. The study found that vitamin D levels were significantly lower in patients who developed recurrent spinal cord disease."Our findings suggest that there may be an association between lower total 25-hydroxyvitamin D levels in patients with recurrent TM/NMO/ spectrum disorders as compared with their counterparts with monophasic disease," the authors report. They suggest that future studies are needed to further assess the relationship between vitamin D and recurrent spinal cord disease.

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, Nov. 7 (Xinhuanet) -- A huge asteroid will pass closer to Earth than the moon on Tuesday, but experts say there is no cause for alarm.Asteroid 2005 YU 55 will pass about 300-thousand kilometers from the earth. The giant space rock is about 400 meters in diameter. The close encounter will occur at 23:28 Greenwich Mean Time. Computer models showing the asteroid’s path for the next 100 years show there is no chance it will hit Earth during that time.Previous studies show the asteroid is what is called a C-type asteroid that is likely made of carbon-based materials and some silicate rock.