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WASHINGTON, April 3 (Xinhua) -- In the largest study of its kind, researchers from a consortium led by the University of Pennsylvania School of Medicine, the University of Miami, and the Boston University School of Medicine, identified four new genes linked to Alzheimer's disease. The findings appeared Sunday in the current issue of Nature Genetics.Each gene individually adds to the risk of having this common form of dementia later in life. These new genes offer a portal into what causes Alzheimer's disease and is a major advance in the field.The study, conducted by the Alzheimer's Disease Genetics Consortium, reports genetic analysis of more than 11,000 people with Alzheimer's disease and a nearly equal number of elderly people who have no symptoms of dementia. Three other consortia contributed confirming data from additional people, bringing the total number of people analyzed to over 54,000. The consortium also contributed to the identification of a fifth gene reported by other groups of investigators from the United States, the United Kingdom, France, and other European countries.The study is the result of a large collaborative effort with investigators from 44 universities and research institutions in the United States, led by Gerard Schellenberg at University of Pennsylvania."This is the culmination of years of work on Alzheimer's disease by a large number of scientists, yet it is just the beginning in defining how genes influence memory and intellectual function as we age. We are all tremendously excited by our progress so far, but much remains to be done, both in understanding the genetics and in defining how these genes influence the disease process," Schellenberg said.Until recently, only four genes associated with late-onset Alzheimer's have been confirmed, with the gene for apolipoprotein E-e4, APOE-e4, having the largest effect on risk. The Nature Genetics studies add another four -- MS4A, CD2AP, CD33, and EPHA1 -- and contribute to identifying and confirming two other genes, BIN1 and ABCA7, thereby doubling the number of genes known to contribute Alzheimer's disease.

BEIJING, April 19 (Xinhuanet) -- Almost one year after the disastrous oil spill, scientists believe that the overall health of the Gulf of Mexico as nearly back to normal.However, the scientists restrain their optimism about nature's resiliency with the glaring blemishes out there. It's been nearly a year since BP's Gulf of Mexico oil spill began last April, triggering one of the world's worst environmental disasters. Nearly 5 million barrels of oil leaked from the ruptured Deepwater Horizon well during the months-long catastrophe.BP said last November that the disaster cost it nearly 40 billion U.S. dollars, according to a Guardian report.According to a BP survey of researchers, over three dozen scientists grade the Gulf's big picture health a 68 on average, using a 1-to-100 scale.That's just a few points below the 71 the same researchers gave last summer when asked what grade they would give the ecosystem before the spill. And it's an improvement from the 65 given back in October after months of the oil spill.

PARIS, April 22 (Xinhua) -- Heavy load launcher Ariane 5 lifted off two communication satellites, Yahsat Y1A and Intelsat New Dawn, at around 6:37 p.m. local time (2137 GMT) on Friday from Europe's Spaceport in French Guiana.Yahsat Y1A is the first United Arab Emirates satellite launched by Arianespace. It is built by Astrium and Thales Alenia Space and will be positioned at 52.5 degrees East. With a design life of 15 years, it will be operated by the Al Yah Satellite Communications Company, a telecommunications company indirectly controlled by the Abu Dhabi Government.Weighing around 5,935 kilograms at lift-off, Yahsat Y1A was expected to be separated first around 27 minutes after the launcher started the flight.The second passenger Intelsat New Dawn was built by Orbital Sciences Corporation and weighs about 3,000 kilograms. Also with a designed life span of 15 years, it is planned to be positioned at 32.8 degrees East.Via the second mission of Ariane 5 in 2011, Yahsat Y1A will provide customized relay services for the government and commercial sectors in the Middle East, Africa, Europe and Southwest Asia, while Intelsat New Dawn will work as a part of the global Intelsat fleet, offering service for Africa.This launch, the 201st of an Ariane family vehicle since 1979, brought to 22 the number of Intelsat satellites serving Africa, according to the launching company.Originally scheduled for liftoff on March 30, this dual-payload mission was delayed following an interruption of the final countdown when an incorrect displacement of one of the engine's actuators was detected, Arianespace said in a statement. The launching center planned to have six liftoffs of Ariane 5 through this year.

GENEVA, March 28 (Xinhua) -- The world is ill-prepared to respond to a severe influenza pandemic or to any similarly global, sustained, and threatening public health emergency, an independent expert-committee entrusted by World Health Organization (WHO) said at its fourth meeting here on Monday.The Review Committee, tasked to look into the experience gained in the global response to the influenza A (H1N1) pandemic in 2009, issued its preliminary report at the meeting.In the report, the Committee said, "global preparedness can be advanced through research, strengthened health-care delivery systems, economic development in low and middle-income countries and improved health status."It recommended that international society establish an extensive global public health reserve corps consisted of experts and public health professionals, which could be deployed to support countries in need, in case of future pandemics.Another suggestion was to create a contingency fund for public health emergencies to be held in trust at an institution such as the World Bank, in order to provide financial support during a declared public health emergency of international concern.The report also urged WHO member states to reach an agreement on sharing of viruses and access to vaccines, and encouraged them to run independent or cooperative influenza research program.WHO Director-General Margaret Chan said at the opening of the meeting that the report had offered "critical guidance to all ministers of health who need to make far-reaching decisions."She said the recommendations in the report would help to " improve the capacity of WHO and the international community to respond to public health emergencies" and therefore should be taken with "added urgency."In January 2010, WHO's Executive Board established a Review Committee, at Chan's proposal, to review the experience gained in response to the H1N1 pandemic, as well as the International Health Regulations and WHO's functioning in tackling the disease.The Committee is expected to prepare its final report out of the current preliminary version, and submit it to the decision- making body of WHO in May.

BEIJING, Feb. 13 (Xinhua) -- China will impose tax on the one-off subsidy to people taking early retirement, the State Administration of Taxation (SAT) said Sunday.The SAT said the early retirement subsidy, which is not tax-free retirement income, should be imposed with personal income tax.However, the tax will be calculated after the subsidy is divided by the months between the date of the completion of retirement formalities and the corresponding legal retirement date, the SAT said.