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يكي از قديمي ترين وبلاگها كه با كمك شما دوستان به كار خود ادامه ميدهد
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Scientists on Sunday announced that they had uncovered the first gene that helps explain common differences in height among humans. Just a single change in the gene’s DNA code determines whether people will be taller or shorter by up to one centimetre, they said, adding that hundreds of other genes are also likely to play a role in height. Genetic heritage has long been known as the driver of height — everyone knows that a child whose parents are both tall is also likely to grow up tall, too. Unlike obesity, where genes and environmental factors (nutrition and exercise for example) play a joint role, around 90% of the determinants for height are genetic. ادامه مطلب
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نوشته شده در سه شنبه سیزدهم شهریور 1386ساعت 10:45 توسط پيمان كاظميان حدادي
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Surgeons will soon be able to literally mend a broken heart using live tissue grown from a patient’s very own stem cells, top cardiologists said on Monday. The whole procedure — harvesting cells from bone marrow, growing tissue, and surgically implanting the heart muscle or valve — could take as little as six weeks and could become routine within three-to-five years, they reported. Their findings were published in a special issue of the Philosophical Transactions of The Royal Society B in Britain. One reason heart attacks are so debilitating, even when they are not fatal, is because the human heart — a massive muscle surrounding four valves controlling the body’s blood flow — does not regenerate. Damaged tissue stays damaged. ادامه مطلب
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نوشته شده در سه شنبه سیزدهم شهریور 1386ساعت 10:41 توسط پيمان كاظميان حدادي
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