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SSS 2008-07-01

时间:2010-05-14 03:10来源:互联网 提供网友:木渐浅。   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science, I am Cynthia Graber. This'll just take a minute.

Imagine tweezers1 so fine that you could reach right into a cell and manipulate individual molecules2. MIT researchers have created such a tweezer, using beams of light. The tweezer is so precise it’s been used to determine how strong the chemical bonds are between two protein molecules in a cell. The research was published in the June 30th edition of the Proceedings3 of the National Academy of Sciences. It builds on work published last fall, when the same scientists demonstrated that so-called optical tweezers could pick up and move cells on a microchip. Scientists wanted to investigate protein bonds to get a better understanding of the forces that give cells structure and the ability to move around. They used the light-beam tweezer to pin one type of protein in place. Another beam tugged4 at a second protein, which eventually broke completely away from the first. By knowing the energy necessary to break the bond, the scientists were in fact measuring the strength of that bond. Researchers say the tweezers can be applied5 to hundreds of other protein interactions that make up the cell’s architectural skeleton, potentially teasing out secrets of how cells work.

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 tweezers ffxzlw     
n.镊子
参考例句:
  • We simply removed from the cracked endocarp with sterile tweezers.我们简单地用消过毒的镊子从裂开的内果皮中取出种子。
  • Bee stings should be removed with tweezers.蜜蜂的螫刺应该用小镊子拔出来。
2 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
3 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
4 tugged 8a37eb349f3c6615c56706726966d38e     
v.用力拉,使劲拉,猛扯( tug的过去式和过去分词 )
参考例句:
  • She tugged at his sleeve to get his attention. 她拽了拽他的袖子引起他的注意。
  • A wry smile tugged at the corner of his mouth. 他的嘴角带一丝苦笑。 来自《简明英汉词典》
5 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
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TAG标签:   SSS  manipulate
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