英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2011-07-21

时间:2011-08-09 05:46来源:互联网 提供网友:gmeng   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

 This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

After water, tea is the world's most popular drink. Now three New York City high school students have discovered what maybe a bruing scandal because they found stuff in lots of teas that shouldn't be there. The students were guided by professional researchers as they worked their way through 70 teas and 60 urbal varieties. The material tested came from 33 companies and originated in 17 countries. The high schoolers extracted and amplified1 the tea DNA2 and then sent it to a sequencing facility. They then compared the sequences they got back with none sequences listed in the * data base maintained by the US National Library at Medicine. The junior scientists found that 4% of the straight teas contained additional plant material and more than a third of the urbal products included unlisted ingredients., such as louis blue grass and White goosefoot. Four of the urbal mixes contained relatives of parslie and seven had unlisted calmenmeal. The research was published in the Nature Journal Scientific Reports.
The effort shows that it's possible to cheaply identify food ingredients and do quality control. And all like calmameal may represent in the attempt to keep us calm about inpiredies.
Thanks for the minute. For Scientific American's 60-Second Science. I'm Cynthia Graber.

点击收听单词发音收听单词发音  

1 amplified d305c65f3ed83c07379c830f9ade119d     
放大,扩大( amplify的过去式和过去分词 ); 增强; 详述
参考例句:
  • He amplified on his remarks with drawings and figures. 他用图表详细地解释了他的话。
  • He amplified the whole course of the incident. 他详述了事件的全过程。
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。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   sss  托福素材
顶一下
(0)
0%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴