遗传性烟酸缺乏症

Sickle cell disease is a blood disorder due to a single genetic mutation. It remains in populations because the mutation has a flip sideit helps to protect against malaria. Now another mutation has been shown to afford similar protection. Deficiency

发表于:2018-12-24 / 阅读(45) / 评论(0) 分类 Scientific American(十二)月

This is the VOA Special English Health Report. A question from Taiwan: Chung-Li wants to know why his face turns red when he drinks alcohol. A party in Tokyo This effect called facial flushing is a common reaction to alcohol among East Asians. It af

发表于:2019-01-11 / 阅读(124) / 评论(0) 分类 VOA慢速英语2009年(五)月

Where Do We Come From? 我们来自哪里? Would you like to know where your ancestors came from? British and American scientists may have found answers for you. They have developed a new algorithm to study deoxyribonucleic acid, also known as DNA --

发表于:2019-01-12 / 阅读(56) / 评论(0) 分类 2014年VOA慢速英语(八)月

By Melinda Smith Washington, D.C. 07 June 2007 For years, doctors urged women to take folic acid if they planned to get pregnant. Then researchers discovered the nutrient helped reduce the risk of a heart attack. But now a new study shows folic acid

发表于:2019-01-16 / 阅读(101) / 评论(0) 分类 2007年VOA标准英语(六月)

Gene for Disease Has Healthy Flip Side A study in the journal Science finds that the gene for anemia-causing G6PD deficiency also protects against malaria, thereby keeping the gene active in populations. Cynthia Graber reports Sickle cell disease is

发表于:2019-01-30 / 阅读(142) / 评论(0) 分类 60秒科学

67 维生素C能否破坏DNA? DATE=7-11-01 TITLE=SCIENCE REPORT - Vitamin C and DNA BYLINE=Nancy Steinbach (Start at 59

发表于:2019-01-30 / 阅读(65) / 评论(0) 分类 科技之光
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