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WASHINGTON, Sept. 26 (Xinhua) -- Older people with low blood levels of vitamin B12 markers may be more likely to have lower brain volumes and have problems with their thinking skills, according to researchers at Rush University Medical Center in Chicago.The results of the study will be published Tuesday in Neurology, the medical journal of the American Academy of Neurology.Foods that come from animals, including fish, meat, especially liver, milk, eggs and poultry are usual sources of vitamin B12.The study involved 121 older residents of the south side of Chicago over the age of 65. They had blood drawn to measure levels of vitamin B12 and B12-related markers that can indicate a B12 deficiency. The same subjects took tests measuring their memory and other cognitive skills.An average of four-and-a-half years later, MRI scans of the participants' brains were taken to measure total brain volume and look for other signs of brain damage.Having high levels of four of five markers for vitamin B12 deficiency was associated with having lower scores on the cognitive tests and smaller total brain volume."Our findings definitely deserve further examination," said Christine Tangney, associate professor at Rush University Medical Center and lead author of the study. "It's too early to say whether increasing vitamin B12 levels in older people through diet or supplements could prevent these problems, but it is an interesting question to explore. Findings from a British trial with B vitamin supplementation are also supportive of these outcomes."On the cognitive tests, the scores ranged from -2.18 to 1.42, with an average of 0.23. For each increase of one micromole per liter of homocysteine -- one of the markers of B12 deficiency -- the cognitive scores decreased by 0.03 standardized units or points.Tangney noted that the level of vitamin B12 itself in the blood was not associated with cognitive problems or loss in brain volume. "Our findings lend support for the contention that poor vitamin B12 status is a potential risk factor for brain atrophy and may contribute to cognitive impairment," said Tangney.

SINGAPORE, June 14 (Xinhua) -- Researchers from Singapore and China are conducting a research aimed at using different technologies to completely capture and convert carbon dioxide in industrial emissions into energy, local daily Lianhe Zaobao reported on Tuesday.The project, supported by the National Research Foundation (NSF) of Singapore, will make use of sunlight as well as photochemical and photosynthetic processes, the foundation said.The researchers involved in the five-year project are from China's Peking University and Singapore's National University of Singapore and the Nanyang Technological University. A research center will be established under the Campus for Research Excellence and Tehnological Enterprise, a program also known as CREATE, the foundation said.It will be the first project involving cooperation with a Chinese university under the program. It will be located at the University Town of the National University of Singapore due to be completed by the end of the year.Lee Yuan-Kun, a researcher at the National University of Singapore, said no single chemical process can capture and convert the carbon dioxide completely so the researchers will be first treating the emissions with photochemical and electrochemical processes to convert most of the carbon dioxide into energy resources such as methane.The gas with thinner carbon dioxide will then be used to grow microalgae, he said.Nevertheless, for the cost of renewable energy to be close to that of fossil fuel, the efficiency will have to be drastically improved by about five to 10 times, Lee said.The project is one of three energy research projects to be housed under the Campus for Research Excellence and Tehnological Enterprise program.Zhang Dongxiao, from the College of Engineering at Peking University, said that the research program seeks to develop energy efficient and environmentally friendly carbon capture technologies that can be applied in the manufacturing and chemical industries, and that it complements Peking University's strong capability in carbon storage."Reducing carbon intensity will not only benefit both countries in terms of cost competitiveness of products made, but also portrays a good image on our national responsibility to achieve a sustainable Earth," Zhang said. 

STOCKHOLM, July 7 (Xinhua) -- A patient has been given a new trachea made from a synthetic scaffold seeded with his own stem cells in a Stockholm's hospital, the Swedish medical university Karolinska Institutet said on Thursday.The operation was performed on June 9th at Karolinska University Hospital in Huddinge and the patient, a 36-year old man, has been well on the way to recovery and would be discharged from the hospital on Friday, the university said in a statement.The patient had been suffering from late stage tracheal cancer with the tumor had reached approximately 6cm in length and was extending to the main bronchus.Since no suitable donor windpipe was available, the transplantation of the synthetic tissue engineered trachea was performed as the last possible option for the patient.The successful transplantation of tissue engineered synthetic organs, referred to as regenerative medicine, could open promising therapeutic possibilities for the thousands of patients who suffer from similar conditions.Transplantations of tissue engineered windpipes with synthetic scaffolds in combination with the patient's own stem cells as a standard procedure means that patients would not have to wait for a suitable donor organ.This would be a substantial benefit for patients since they could benefit from earlier surgery and have a greater chance of cure, according to the statement.

WASHINGTON, June 7 (Xinhua) -- Salmonella infections have not decreased during the past 15 years and have instead increased by 10 percent in recent years in the United States, according to a report released Tuesday by the Centers for Disease Control and Prevention (CDC).During the same time period, illnesses from the serious Shiga toxin-producing E. coli O157 have been cut nearly in half and the overall rates of foodborne infections have been reduced by 23 percent, the new Vital Signs report said.The report summarizes 2010 data from CDC's Foodborne Diseases Active Surveillance Network (FoodNet), which serves as America's report card for food safety by tracking whether nine of the most common infections transmitted through foods are increasing or decreasing."Although foodborne infections have decreased by nearly one-fourth in the past 15 years, more than one million people in this country become ill from Salmonella each year, and Salmonella accounts for about half of the hospitalizations and deaths among the nine foodborne illnesses CDC tracks through FoodNet," said CDC Director Thomas Frieden in a statement.In 2010, FoodNet sites, which include about 15 percent of the American population, reported nearly 20,000 illnesses, 4,200 hospitalizations and 68 deaths from nine foodborne infections. Of those, Salmonella caused more than 8,200 infections, nearly 2,300 hospitalizations and 29 deaths (54 percent of the total hospitalizations and 43 percent of the total deaths reported through FoodNet). CDC estimates that there are 29 infections for every lab-confirmed Salmonella infection.Salmonella, which is responsible for an estimated 365 million U.S. dollars in direct medical costs each year in the United States, can be challenging to address because so many different foods like meats, eggs, produce, and even processed foods, can become contaminated with it and finding the source can be challenging because it can be introduced in many different ways.In response to that challenge, the U.S. Food and Drug Administration, which regulates eggs, produce and many processed foods, has developed new rules for the egg industry to follow under its recently expanded regulatory authorities.The rate of E. coli O157 cases reported by FoodNet was two cases per 100,000 people in 1997 and, by 2010, had decreased to 0.9 cases per 100,000 people. The CDC credits the reduction in E. coli to improved detection and investigation of outbreaks, cleaner slaughter methods, better inspections of ground beef processing plants, and increased awareness by consumers and restaurant employees of the importance of properly cooking beef.

GUANGZHOU, Aug. 2 (Xinhua) -- China conducted a scientific survey of the southwest basin of the South China Sea around the end of July, the China Geological Survey (CGS) said on Tuesday.The expedition acquired a "high-quality integrative geographic profile" of the basin's 1,000-km-long survey line, which stretches from the region's Xisha Islands to the Nansha Islands, according to a press release from the CGS.The expedition allows scientists to study the evolution of tectonic activity in the South China Sea and predict disasters such as earthquakes and tsunamis, the CGS said.The survey is also of significance for countries around the South China Sea, as they will be able to use the data to enhance their ability to prevent and reduce the effects of disasters, it said.The survey lasted from June 13 to July 31 and was carried out by the Chinese research vessel Tanbao in collaboration with a French research unit. Recent typhoons prevented the researchers from surveying part of the region, therefore some data is yet to be supplied later, the CGS said.