The descendants of longtime urban dwellers show increased genetically driven resistance to tuberculosis, due to evolutionary selection pressure over millennia. Christopher Intagliata reports 城市长久居住民的后代,经过数千年的自然选择

发表于:2018-12-07 / 阅读(115) / 评论(0) 分类 60秒科学

AGRICULTURE REPORT – January 29, 2002: Genetically Engineered Crops Increasing By George Grow Soybeans This is the VOA Special English AGRICULTURE REPORT. Increasing numbers of farmers are growing g

发表于:2018-12-07 / 阅读(87) / 评论(0) 分类 农业与发展

By Nancy Steinbach HEALTH REPORT -April 24, 2002: Study of Cousins Who Marry This is the VOA Special English Health Report. Sometimes people who are first cousins get married. Two people are first cou

发表于:2018-12-07 / 阅读(79) / 评论(0) 分类 健康与环境

AGRICULTURE REPORT - Study of a Biotech Plant Finds Pollen Can Travel Farther than Thought By Mario Ritter Broadcast: Tuesday, October 05, 2004 This is Gwen Outen with the VOA Special English Agricult

发表于:2018-12-07 / 阅读(87) / 评论(0) 分类 农业与发展

This is the VOA Special English Health Report. We all know that some people do not seem as emotionally strong as others when life gets difficult. But why is that? A study published in two thousand three in the journal Science offered an answer. The

发表于:2018-12-15 / 阅读(86) / 评论(0) 分类 VOA慢速英语2009年(六)月

试管狗崽挽救濒危品种 These playful puppies are part of litter of seven, born July 10, out of 19 embryos implanted in the same female dog. Five are beagles and two are beagle-cocker spaniel mixes. 7月10日,一窝狗崽出生,研究人员将

发表于:2018-12-16 / 阅读(58) / 评论(0) 分类 VOA标准英语2016年(二月)

Nothing says overeducated egghead like a pair of coke-bottle glasses. But even clichs sometimes hit the nerd on the head. Because a new study finds that nearsightedness is linked to the number of years spent in school. The findings can be viewed in t

发表于:2018-12-24 / 阅读(71) / 评论(0) 分类 2014年Scientific American(七)月

DNA Points to Multiple Migrations into the Americas 美洲多次殖民迁移之谜 For more than ten thousand years, Alaska Native and Canadian First Nations people have lived along the Northwest coast of North America. Now, ancient remains have prov

发表于:2018-12-24 / 阅读(106) / 评论(0) 分类 2017年Scientific American(六)月

Researchers at Penn State University and the University of Buffalo have completed the most in depth bear DNA study to date. The project has revealed a lot about genetic relationships between bears, and also the unlikely romances that pepper their his

发表于:2018-12-28 / 阅读(61) / 评论(0) 分类 初学者听力文摘精选

If you're confused by Three Parent... you come to the right place. This is my kitchen lab. The eggs here are somewhat larger but the principles are the same and allows me to demonstrate what scientists hope to do with humans. Inside the egg core are

发表于:2019-01-02 / 阅读(67) / 评论(0) 分类 英伦广角

Covalent bond - a strong bond between atoms formed by sharing outer electrons. When an atom has 8 outer electrons it is stable. Those which naturally have 8, like neon and argon gasses are quite unrea

发表于:2019-01-03 / 阅读(90) / 评论(0) 分类 医务英语

In the last decade scientists have managed to sequence the genomes of everything from bacteria and fruit flies to individual human beings. But often overlooked are the genomic sequences of our food. We know the genomes of apples, bananas, potatoes, w

发表于:2019-01-08 / 阅读(103) / 评论(0) 分类 Scientific American(十二)月

Rising season severe storm is the most talked about threats of climate change. But here is another. No more coffee. Because rising temperatures make cripple wild populations of Arabica coffee, and most cultivated species in the world. So says a study

发表于:2019-01-08 / 阅读(93) / 评论(0) 分类 Scientific American(十一)月

2005年全国硕士研究生入学考试英语试题及答案 Section I Use of English Directions: Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANS

发表于:2019-01-11 / 阅读(77) / 评论(0) 分类 考研英语

Finches Can Learn to Sing Differently Than Their Genetics Dictate In the most recent podcast we discussed how baby bats learn their callsfrom all the other bats in their crowded colonies. And we mentioned in passing that songbirds usually get tutored

发表于:2019-01-20 / 阅读(86) / 评论(0) 分类 2018年科学美国人1月

Nothing says overeducated egghead like a pair of coke-bottle glasses. But even clichs sometimes hit the nerd on the head. Because a new study finds that nearsightedness is linked to the number of years spent in school. The findings can be viewed in t

发表于:2019-01-20 / 阅读(78) / 评论(0) 分类 2014年Scientific American(七)月

But polar bear courtship is never straightforward. She likes to play hard-to-get. It's also a challenge for blizzardcam. She's testing his fitness, making sure he is a good catch. He skills on the slopes show room for improvement. And now, the female

发表于:2019-01-22 / 阅读(87) / 评论(0) 分类 自然百科2010年

By Mike O'Sullivan American Samoa 12 October 2009 Two boys walk through a damaged village in American Samoa The U.S. military, civilian agencies and private aid organizations have been providing assistance for tsunami-ravaged sections of American Sa

发表于:2019-02-20 / 阅读(157) / 评论(0) 分类 VOA标准英语2009年(十月)

Nutrigenomics 营养基因组学(nutrigenomics 或nutritional genomics,又叫营养遗传学 nutrigenetics)是研究营养素和植物化学物质对机体基因的转录、翻译表达及代谢机理的科学。 膳食是影响人体健康最重

发表于:2019-02-24 / 阅读(91) / 评论(0) 分类 英语听力文摘 English Digest

今天我们要学的词是 genetic, genetic is spelled g-e-n-e-t-i-c; genetic. Genetic 基因的。最新研究发现,人体对咖啡因的需要跟基因有关。The researchers compared the genetic makeup and caffeine consumption habits of more

发表于:2019-02-25 / 阅读(111) / 评论(0) 分类 英语单词荟萃