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SSS 2011-12-19

时间:2012-01-13 05:42来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 This is Scientific American's Sixty Seconds Science. I'm Sophie Bushwick. Got a minute?

To monitor the biodiversity of the freshwater habitat, you could compare by the water and count the rare wildlife. Or you could  just scoop1 up a cup of water. 
A new Dutch study has found that the DNA2 traces in a small sample of a body of water can reveal the species that live in it. The work is in the journal Mernaculary? college. 
As animal swim through a lake, they live behind traces of DNA. The more individual serves a particular species, the more DNA of that species will be shared, and be available to be measured.
The researches tested about 100 European lakes and streams, comparing the DNA evidents to traditional found observations. And  the small sample technique enable them to correctly identify the species and the sizes of their populations. 
Measuring biodiversity is an important part of protecting endangered species. This quick and easy method of snagging a water sample which can be tested at a lab miles away from the sight could refresh the processes species monitoring.
Thanks for the minute for Scientific American's Sixty Seconds Science. I'm Sophie Bushwick.

点击收听单词发音收听单词发音  

1 scoop QD1zn     
n.铲子,舀取,独家新闻;v.汲取,舀取,抢先登出
参考例句:
  • In the morning he must get his boy to scoop it out.早上一定得叫佣人把它剜出来。
  • Uh,one scoop of coffee and one scoop of chocolate for me.我要一勺咖啡的和一勺巧克力的。
2 DNA 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
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