标签：embryo 相关文章
After we had seen how relatively easy it was to change the switches in mouse embryos, we thought that perhaps the same could be true of human embryos. In IVF, you also have the embryo for a brief peri
基因外遗传现象
If inheritance was not just about DNA, if these gene switches were so important, just what could turn them on or off? Stephanie and Emend Mullins have two children, Karen and Charlotte. When we were t
基因外遗传现象
1. Iran is bowing to international pressure and vowing it will let the UN nuclear agency inspect its newly revealed unfinished uranium enrichment facility. Word of the plan has outraged leaders across the globe. However, Iran says it has done nothin
美联社新闻一分钟2009年(九)月
Welcome to Wednesday. This is CNN Student News. We're going to get things started today with different forms of extreme wheather. First up, fire. This one in California has burn more than 30,000 acres, but fire fighters have around 60 percent contain
CNN2013年(六)月
Fossils found at Weng'an in Guizhou Province are regarded as the oldest ones to be found in the country, if not the world. Recently, a group of paleontologists gathered at the site to call for more protection of animal fossils that could provide clue
2017CRI中国国际广播电台
Hopes are fading that lonesome George, a unique giant Galpagos tortoise, will become a father. George lives in the Galpagos National Park in Ecuador and is believed to be the last living member of its species. Conservationists are anxious to ensure h
自然百科2008年
Hopes are fading that lonesome George, a unique giant Galpagos tortoise, will become a father. George lives in the Galpagos National Park in Ecuador and is believed to be the last living member of its species. Conservationists are anxious to ensure
国家地理2008年
Is Cloning the Future? 克隆一个你？ Saving lives has always been an important mission of science. Now science, and indeed all society, is facing a new dilemma:whether or not to try and save more lives through human cloning. The first cloning ex
双语有声阅读
有些以字母O结尾的名词也有两种复数形式，可以加s，也可以加es，例如： mottomottos(mottoes)箴言 manifestomanifestos(manifestoes)宣言 cargocargos(cargoes)货物 buffalobuffalos(buffaloes)水牛 halohalos(haloes)光环 gr
薄冰实用英语语法详解
Macrophages - cells derived from monocytes which have the ability to phagocytose foreign particles and dead tissue and to move through tissue, or to remain fixed in one place. There are many macrophag
医务英语
Karin Rodriguez never really worried about her weight until doctors told her it could interfere with the one thing she'd always wanted to become a mother. And you need to lose weight. There is no other option, you know. This is what you have to do to
万花筒2011年
HEALTH REPORT - New Embryonic Stem Cell Lines Developed for Researchers By Paul Thompson Broadcast: Wednesday, August 11, 2004 This is Gwen Outen with the VOA Special English Health Report. Researcher
健康与经济
By Ted Landphair Washington 26 July 2007 For a second time in a year, President Bush has vetoed a bill that would have sanctioned federally funded stem cell research using human embryos. His stance reflects conservatives' view that destroying life to
2007年VOA标准英语（七月）
科学家们通过不同的方式拯救犀牛 The biggest threat to rhinos are poachers who kill them for their horns. 对犀牛而言最大的威胁是偷猎者为了它们的角而将其置于死地。 In spite of a lack of scientific proof, many i
VOA标准英语2015年(十二月)
He was the embryo of the very thing we were trying to do consciously. He had started with bossa nova, and he had added rhythm'n'blues and rock'n'roll to his thing. And he had a new synthesis that prefigured everything the Tropicalistas wanted to, to
自然百科2012年
Labour MPs may not have to vote against their conscience over the governments controversial bill on embryo research, according to the health secretary Alan Johnson. He said he was confident and accommodation could be reached with Catholic MPs. Althou
英伦广角
本期内容： Precise chemical surgery has been performed on human embryos to remove disease in a world first, Chinese researchers have told the BBC. The team at Sun Yat-sen University used a technique called base editing to correct a single error
夏说英语新闻晨读
What's wrong with having three parents? I'm happy with two but maybe it would have been a case of the more the merrier. The role of parents is not only to give us love and guidance, but also to pass on genetic code. A few particular healthy genes wou
英语听力精选进阶版
In mammals, the sex of a baby is determined by the combination of chromosomes it inherits from its parents. Nearly every cell in a male body has two different sex chromosomesone is shaped like an X and one is shaped like a Y. Females also have two se
英语时差8，16
President Obama and his Russian counterpart Vladimir Putin have met in New York opening their discussions on Syria and Ukraine with a stony face handshake. US officials said they agreed to explore a political solution to the crisis in Syria. Presiden
英语听力精选进阶版