SSS 2010-11-08
时间：2019-01-08 作者：英语课 分类：Scientific American(十一)月
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 ethical 1 concerns of working with embryonic 2 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 functional 4 adult human blood cells. The technique involves gene 3 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.
- 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。
- 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。
- 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。
- 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。