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SSS 2008-09-04

时间:2010-05-15 00:58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'm Cynthia Graber. This will just take a minute.

 

Conditions such as mad cow disease are caused by abnormally shaped proteins, called prions. Prions spread by causing other, normal proteins to misfold and adopt the abnormal shape—no genetic1 material like DNA2 is involved. Prion diseases affect the brains of a number of mammals, including humans. Although humans can get mad cow from beef, these unusual diseases rarely jump between species. Still, scientists say new forms of prion diseases have arisen lately, and there’s concern that they could hop3 to humans. So researchers want to understand the species barrier better.

 

A study published in the September 4th issue of the journal Cell investigates that issue. Scientists from Texas, Spain and Chile took normal hamster proteins and mixed them with misfolded mouse ones.  And the mouse prions were able to change the hamster proteins into a new kind of prion that infected both healthy hamsters and mice. The test tube is obviously an unnatural4 situation, but it shows that prions can leap the species barrier without the aid of any other infectious agent. Scientists hope to learn more about how this process works so they can keep prions in their place—away from humans.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber .

 


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1 genetic PgIxp     
adj.遗传的,遗传学的
参考例句:
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
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。
3 hop vdJzL     
n.单脚跳,跳跃;vi.单脚跳,跳跃;着手做某事;vt.跳跃,跃过
参考例句:
  • The children had a competition to see who could hop the fastest.孩子们举行比赛,看谁单足跳跃最快。
  • How long can you hop on your right foot?你用右脚能跳多远?
4 unnatural 5f2zAc     
adj.不自然的;反常的
参考例句:
  • Did her behaviour seem unnatural in any way?她有任何反常表现吗?
  • She has an unnatural smile on her face.她脸上挂着做作的微笑。
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TAG标签:   SSS  protein
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