标签：embryos 相关文章
14 A Rare Fossil Record The preservation of embryos and juveniles is a rate occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be fossilized. Ichthyosaurs had
新概念优美背诵短文50篇
Cloning has always been with us and is here to stay. It is a way of making an exact copy of another animal or plant. It happens in plants when gardeners take cuttings from growing plants to make new ones. It also happens in animals when twins identi
高中英语示范课
The possibility of cloning fierce and extinct wild animals has always excited film makers. And they are not the only ones! The popularity of films such as Jurassic Park, in which a scientist clones several kinds of extinct dinosaurs, proves how the i
高中英语示范课
The Bare Necessities Of Bears In the movie The Jungle Book, Balloo the bear spends his days singing and dancing and munching paw-paws. Actually, this is a pretty accurate picture of real bears, except for the singing and dancing. North American bears
英语听力文摘 English Digest
By Jessica Berman Washington 29 November 2006 The well-known scientific journal Science should require more information from authors, especially if their papers are likely to generate a lot of public attention. That's the conclusion of an independen
2006年VOA标准英语（十一月)
By Melinda Smith Washington, DC 22 June 2006 watch Stem Cell report A new medical treatment injecting embryonic stem cells and other drugs into paralyzed mice has researchers wondering if it could eventually help humans suffering from Parkinson's an
2006年VOA标准英语（六月）
By Sabina Castelfranco Rome 05 February 2006 Green balloons bearing writings 'Yes to Life' and 'Pro-life Movement', are seen in St. Peter's square at the Vatican, February 5, 2006 Marking the Italian
2006年VOA标准英语（二月）
By Michael Bowman Washington 07 June 2007 Scientists in the United States say they have for the first time been able to create stem cells from the ordinary skin cells of mice, a breakthrough that could lead to new medical breakthroughs and eliminate
2007年VOA标准英语（六月）
By Deborah Tate Washington 19 July 2006 watch Bush Stem Cell report The U.S. Senate has approved and sent to President Bush a bill that would allow federal funding of embryonic stem cell research. The president opposes the measure on moral grounds,
2006年VOA标准英语（七月）
By Efam Dovi Accra 23 August 2006 In Ghana, a high court in the capital Accra Tuesday sentenced five robbers to more than 300 years in prison in what the police say is a clear sign the country is taking violent crime seriously. The spate of armed ro
2006年VOA标准英语（八月）
SCIENCE IN THE NEWS - American Scientists Create The World's First Genetically Engineered Monkeys CHRISTOPHER CRUISE: This is SCIENCE IN THE NEWS, in VOA Special English. Im Christopher Cruise. JUNE SIMMS: And Im June Simms. Today, we tell about the
2012年VOA慢速英语(二)月
By Scott Stearns White House 22 July 2006 President Bush and Secretary of State Condoleezza Rice meet with senior Saudi diplomats Sunday to discuss continuing violence between Israel and Hezbollah militants across the Lebanese border. Secretary Rice
2006年VOA标准英语（七月）
By Jim Malone Washington 17 August 2006 The ethical and moral debate over expanding embryonic stem cell research could motivate voters on both sides of the issue in this year's U.S. congressional elections. Color-enhanced stemcell from bonemarrow Em
2006年VOA标准英语（八月）
By Melinda Smith Washington 27 June 2007 President Bush speaking at the White House about stem cell research, 20 Jun 2007 Some U.S. scientists say President Bush's veto last week of federal funding for stem cell research raises questions about the f
2007年VOA标准英语（六月）
By Greg Flakus Houston, TX 29 March 2007 Watch Houston LIvestock Show Rodeos and livestock shows are a common part of life in many parts of the United States, but if there is one special event of this kind, it is the Houston Livestock Show and Rodeo
2007年VOA标准英语（三月）
The 2016 Nobel Prize in Physiology or Medicine goes to Yoshinori Ohsumi of Japan for his discoveries of mechanisms of whats known as autophagy. Break the word down and you get auto and phagy: from the Greek for self, auto, and eating, phagein. So, se
2016年Scientific American(十)月
By Deborah Tate Washington 17 July 2006 The U.S. Senate Tuesday is expected to approve federal funding for expanded embryonic stem cell research, despite a veto threat from President Bush who opposes the idea on moral grounds. -------- On the eve of
2006年VOA标准英语（七月）
U.S. President Barack Obama has lifted restrictions on federal funding for medical research using human embryonic stem cells. Mr. Obama says it is part of a broader effort to limit political interference in science. President Barack Obama signs an E
VOA标准英语2009年(三月)
By CCTV reporter Su Yuting Cloning is a controversial and decisive issue that has split public opinion regarding its potential benefits versus the ethical issues it raises. In recent years, scientists have been using the cloning of pigs for medical r
CCTV9英语新闻2014年01月