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LOS ANGELES, March 2 (Xinhua) -- Those who take a nap are more likely to have lower levels of blood pressure despite stress, said a new study in the latest issue of International Journal of Behavioral Medicine available on Wednesday.In the study, researchers at Sarah Conklin of Allegheny College in Meadville, Pennsylvania examined 85 healthy university students, who were divided into two groups, with one group taking an hour- long nap during the day, and the other group having no time to sleep. Both groups were given a mental stress test.The study found that participants in both groups experienced increase in blood pressure and pulse rates when they took the stress test, but the average blood pressure of those who slept for at least 45 minutes was significantly lower after the stress test than it was for those who did not sleep.The researchers drew the conclusion that a daytime nap of at least 45 minutes may help stressed-out people lower their blood pressure and protect their heart."Our findings suggest that daytime sleep may offer cardiovascular benefit by accelerating cardiovascular recovery following mental stressors," the researchers said in the study."Further research is needed to explore the mechanism by which daytime sleep is linked with cardiovascular health and to evaluate daytime sleep as a recuperative and protective practice, especially for individuals with known cardiovascular disease risk and those with suboptimal sleep quality," they added.Sleep deficiency is common in the United States, posing a long- term health threat. On average, Americans get nearly two hours less sleep a night than they did 50 years ago, according to background information provided by the journal.

WELLINGTON, May 22 (Xinhua) -- One in every eight women giving birth in a New Zealand hospital last year was Asian, local media reported Sunday.In the country's most populous city, Auckland, 5,149 Asian women gave birth, more than double the number of 15 years ago, the New Zealand Herald reported.Last year was the first year in the city when more Asian women gave birth than indigenous Maori women, who registered 5,015 births.Citing figures from the government statistics agency, Statistics New Zealand, the report said the majority of women nationwide who gave birth last year were still of European descent, accounting for 43,965 of last year's 63,897 births.But more women of other ethnic backgrounds were also becoming mothers, including those from the Middle East, Latin America and Africa.Auckland University head of obstetrics and gynaecology, Professor Lesley McCowan, said the increase reflected New Zealand is an increasingly multicultural society.

LOS ANGELES, April 29 (Xinhua) -- Clinical and teaching microbiology laboratories are linked with a nationwide salmonella outbreak in the United States that has killed one person and sickened dozens of others, health officials confirmed on Friday.Since August, about 73 people in 35 states have been sickened by salmonella bacteria, and some of those cases involve a strain of Salmonella typhimurium sold commercially to laboratories, officials from the Centers for Disease Control and Prevention (CDC) said in remarks published by msnbc.com.Illnesses have been tied to laboratories from Alaska to New York, with most reporting one or two cases. Five cases have been reported in Washington state and four in Minnesota.The first illness occurred late August and the most recent cases were reported March 8, according to the CDC.The patients include employees and students of the laboratories, as well as children in the homes of people who work or study at the labs.Patients ranged in age from less than one to 91, with a median age of 24, the CDC said.Cases that developed after March 19 may not yet be included in the total because of the lag time in assessing and reporting illness, said the report.CDC officials warned that bacteria used in the labs can be transmitted through contaminated lab coats, pens, notebooks, car keys and other items brought into the labs.The CDC is working with local and state health departments, the American Society for Microbiology and the Association of Public Health Laboratories to track the outbreak, the report said.Salmonella infections typically result in diarrhea, fever and abdominal cramps. They can be dangerous in very young children or people with compromised immune systems.

KAMPALA, May 14 (Xinhua) -- The deadly Ebola hemorrhagic fever has broken out in Uganda, killing one person and leaving over 30 others being monitored by health officials, ministry of health announced here on Saturday.The epicenter of the outbreak is in the central Ugandan district of Luwero located about 50 km north of the capital Kampala.According to Anthony Mbonye, head of the community health department at the ministry of health, a 12 year old girl in Zirombwe Sub-county developed symptoms of Ebola and when she was admitted at a military hospital in the district, laboratory test confirmed that it was Ebola.The Ebola virus is highly contagious and causes a range of symptoms including fever, vomiting, diarrhea, generalized pain or malaise and in many cases internal and external bleeding.The girl died on May 6 and about 30 people who she got contact with are being asked to not get into contact with the public as health officials monitor them for about 21 days.The 30 people have not yet developed the symptoms but if they do, they will be isolated from the public.Mbonye said that preliminary investigations have showed that this Ebola virus is similar to the one that broke out in Sudan, thus named Sudan Ebola.The epicenter of the outbreak is also located along the high way to southern Sudan.This viral subtype has a human case fatality rate of 60 percent meaning that it will kill 60 percent of the infected people.The other subtype is the Congo Ebola which also attacked Uganda in 2007. This one has a human case fatality rate of over 80 percent.The 2007 outbreak which occurred in the western district of Bundibugyo bordering eastern Democratic Republic of Congo claimed 37 lives out of the 148 infected.Mbonye said that there also ongoing investigations to find out whether the index case got into contact with moneys or bats, the known reservoirs of the Ebola virus.Following the outbreak, government has reactivated the National Ebola Task Force (NETF) to coordinate the fight against the disease at the national level.District task forces are also in the process of being formed according to Mbonye, who is the chairperson of the NETF.

LOS ANGELES, April 12 (Xinhua) -- With the help of NASA Telescopes, astronomers have uncovered one of the youngest galaxies in the distant universe, with stars that formed 13.5 billion years ago, the Jet Propulsion Laboratory (JPL) announced on Tuesday.The finding addresses questions about when the first galaxies arose, and how the early universe evolved, JPL noted in a press release.Infrared data from both the Hubble Space Telescope and the post- coolant, or "warm," phase of NASA's Spitzer Space Telescope mission revealed that the galaxy's stars are quite mature, which means they must have formed when the universe was just a toddler, said JPL in Pasadena, Los Angeles.This challenges theories of how soon galaxies formed in the first years of the universe and could even help solve the mystery of how the hydrogen fog that filled the early universe was cleared, according to astronomers involved in the study.This galaxy is not the most distant ever observed, but it is one of the youngest to be observed with such clarity, JPL said.Normally, galaxies like this one are extremely faint and difficult to study, but, in this case, nature has provided the astronomers with a cosmic magnifying glass, JPL said.The galaxy's image is being magnified by the gravity of a massive cluster of galaxies parked in front of it, making it appear 11 times brighter. This phenomenon is called gravitational lensing."Without this big lens in space, we could not study galaxies this faint with currently available observing facilities," said Eiichi Egami of the University of Arizona in Tucson. "Thanks to nature, we have this great opportunity to see our universe as it was eons ago."The findings may help explain how the early universe became " reionized," according to JPL."Seeing a galaxy as it appeared near the beginning of the universe is an awe-inspiring feat enabled by innovative technology and the fortuitous effect of gravitational lensing," Jon Morse, NASA's Astrophysics Division director at the agency's headquarters in Washington, said in the release."Observations like this open a window across space and time, but more importantly, they inspire future work to one day peer at the stars that lit up the universe following the big bang."