史丁─利芬莎氏症候群(多囊性卵巢症候群)

Little girls are made of sugar and spice and, according to a study published in the journal Cell, a fierce determination to maintain their girlishness. Because it seems that a single gene keeps their ovaries from turning into testes. Scientists have

发表于:2018-12-24 / 阅读(44) / 评论(0) 分类 Scientific American(十二)月

World Down Syndrome Day is on March the 21st every year. It is on this day because the number 21 is important in the identification of Down Syndrome. The condition is created by a 21st, extra chromosome being replicated three times, thus causing the

发表于:2018-12-29 / 阅读(96) / 评论(0) 分类 英语课程学习计划和讲义

By Peter Fedynsky Washington, DC 26 October 2006 watch Nuclear Terrorism Nuclear materials have a wide range of characteristics. Enriched uranium or plutonium have awesome explosive potential. Cesium emits deadly radiation, while isotopes of some ra

发表于:2019-01-12 / 阅读(93) / 评论(0) 分类 2006年VOA标准英语(十月)

SCOTT SIMON, HOST: Three-D printers are being used these days to make all kinds of things - jewelry, artwork, or even guns. Now, scientists have used a 3-D printer to create a functioning mouse ovary. Yes. NPR's Rob Stein explains. ROB STEIN, BYLINE:

发表于:2019-01-17 / 阅读(32) / 评论(0) 分类 2017年NPR美国国家公共电台5月

HEALTH REPORT - Blood Pressure Drugs May Prevent Dry Eye Syndrome By Jerilyn Watson Broadcast: Wednesday, April 07, 2004 This is the VOA Special English Health Report. Many people around the world suf

发表于:2019-01-19 / 阅读(101) / 评论(0) 分类 健康与经济

Gene Stops Ovaries from Testifying A mouse study in the journal Cell finds that a gene in females must remain active throughout her life to keep her ovaries from turning into testes. Karen Hopkin reports Little girls are made of sugar and spice and,

发表于:2019-01-30 / 阅读(157) / 评论(0) 分类 60秒科学