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BEIJING, August 1 (Xinhuanet) -- U.S. researchers have discovered a genetic mutation unique to African Americans that links to heighten their asthma risk, according to reports published on Sunday in the journal Nature Genetics.Researchers of University of Chicago found a gene, PYHIN1, and its variations may account for asthma risk in people of African descent. In their study, they examined data from nine previous genome-wide association studies, totaling more than 2 million single nucleotide polymorphisms in 3,246 asthma patients and 3,385 control patient, 1,702 patient-parent groupings, 355 family-based cases, and 468 family-based controls.In the study, the researchers found that between 26 percent and 29 percent of people of African-descent carried at least one copy of the gene.  In particular, one polymorphism of the gene was 34 percent more likely found in African-American and Afro-Caribbean people with asthma.  More interestingly, this variant of the gene is rarely found in Caucasian people and in Latino population, it was found in less than 5 percent.This new variant is part of a family of genes linked with the body's response to viral infections. It is thought to be involved in interferon signaling, which could influence the occurrence of asthma.The team stressed that each gene variant on its own plays only a small role in increasing asthma risk, but that risk could be multiplied when combined with other risk genes and with environmental factors.

WARSAW, June 2 (Xinhua) -- A possible second E. coli infection patient has been hospitalized in Szczecin, northwestern Poland, Health Minister Ewa Kopacz said Thursday.The man, who recently returned to Poland from Germany, has been diagnosed with exudative diarrhea and is currently being tested for E. coli bacteria.Poland's first E. coli case, a 29-year-old woman permanently residing in Germany and diagnosed with the bacteria over a week ago, is currently in the same hospital.Kopacz said sanitary teams were running E. coli checks countrywide, especially on marketplaces and in warehouses.The E. coli epidemic originated in Germany, where it has taken 17 lives. One death has so far occurred in Sweden, bringing the total death toll to 18.

WASHINGTON, July 20 (Xinhua) -- The loss of a protein that coats sperm may explain a significant proportion of infertility in men worldwide, according to a study by an international team of researchers led by University of California Davis.A paper describing the work was published Wednesday in the journal Science Translational Medicine. The research could open up new ways to screen and treat couples for infertility.The gene DEFB126 encodes a protein called Beta Defensin 126, which coats the surface of sperm and helps it penetrate cervical mucus in the female. A survey of samples from the U.S., Britain and China showed that as many as a quarter of men worldwide carry two copies of the defective gene.In the new study, researchers found that men with a muted DEFB126 lack Beta Defensin 126, making it much more difficult for sperm to swim through the mucus and eventually join with an egg.Examining 500 newly married Chinese couples, researchers found that the lack of Beta Defensin 126 in men with the DEFB126 mutation lowered fertility (even among men that did not display other deficiencies usually associated with infertility, like inadequate semen volume and low sperm motility). Wives of men with the Beta Defensin 126 variant were significantly less likely to become pregnant than were other couples, and 30 percent less likely to have a birth.This genetic variation in DEFB126 likely accounts for many unexplained cases of infertility, researchers say. They hope next to work with a major infertility program in the U.S. to further explore the role of the mutation.

BEIJING, July 17 (Xinhua) -- China's land prices in 105 cities rose 1.87 percent on average in the second quarter over the first, but the rate of growth slowed, the China Urban Land Price Dynamic Monitor, a land price information provider, announced Sunday. < In the second quarter, land price for business properties averaged 5,506 yuan (about 847 U.S. dollars) per square meter, up 2.77 percent from the previous quarter. The growth rate slowed by 0.56 percentage points.Land price for residential properties averaged 4,443 yuan per square meter, up 2.17 percent. The growth slowed by 0.27 percentage points. The price for industrial uses, meanwhile, was up 1.13 percent to reach 645 yuan per square meter. The growth fell 0.3 percentage points.The country's three most prosperous regions, the Yangtze River Delta Region, Pearl River (Zhujiang) Delta Region, and the Bohai Rim, all reported slower land price growth in the second quarter.

MOSCOW, June 15 (Xinhua) -- Russia's Mission Control announced on Wednesday it had raised the International Space Station (ISS) by 10.2 km to 374.7 km with the help of the Europe's ATV-2 Johannes Kepler.The Mission Control conducted the correction to the ISS at 19: 55 Moscow time (1555 GMT) by the boosters of the ATV-2 Johannes Kepler. The correction had lasted for some 40 minutes.According to the Mission Control, the correction was made in line with the ISS's ballistic flight program.On June 12, the Europe's second Automated Transfer Vehicle (ATV) Johannes Kepler has conducted two similar operations, raising the ISS orbit by 19.2 km to 364.6 km.Corrections to the space station's orbit are conducted periodically before launches of Russian cargo ships and U.S. shuttles to compensate for the Earth's gravity and to safeguard successful dockings.According to the Mission Control, the ATV-2 Johannes Kepler is scheduled to undock from the ISS on June 21.

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