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SSS 2010-11-08

时间:2010-12-07 06:39来源:互联网 提供网友:seniorboy   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 Steve Mirsky. Got a minute?
   
    One of the dreams of biomedical scientists is to be able to transform adult cells into other kinds of cells. And thus avoid some of the ethical1 concerns of working with embryonic2 stem cells. Now a research team from McMaster University in Ontario has announced that they've been able to transform human skin cells into blood cells. The work was published online on November 7th by the journal Nature.
   
    Other research in this area has required that cells of one type first be returned to a more generally undifferentiated stem cell state, which can introduce fresh problems. Once there, the cell is then turned into the type of tissue the researchers seek. But in this case, the scientists avoided the middleman cell. The skin was changed directly into what appears to be functional4 adult human blood cells. The technique involves gene3 insertion by a virus vector and exposure to numerous regulatory proteins.
   
    The cells have not been tested in humans to see if they're truly indistinguishable from the home-grown kind. But the research is another step in the effort to create needed cell types from easily available ones.
   
    Thanks for the minute. For Scientific American's 60-Second Science, I'm Steve Mirsky.


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1 ethical diIz4     
adj.伦理的,道德的,合乎道德的
参考例句:
  • It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
  • It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。
2 embryonic 58EyK     
adj.胚胎的
参考例句:
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
3 gene WgKxx     
n.遗传因子,基因
参考例句:
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
4 functional 5hMxa     
adj.为实用而设计的,具备功能的,起作用的
参考例句:
  • The telephone was out of order,but is functional now.电话刚才坏了,但现在可以用了。
  • The furniture is not fancy,just functional.这些家具不是摆着好看的,只是为了实用。
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