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SSS 2011-01-27

时间:2011-02-11 06:51来源:互联网 提供网友:qi2261   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?

Generations of American children have been told, “Eat your broccoli2!” And for decades, researchers have known that broccoli and related vegetables like cauliflower and watercress appeared to lower the risk of some cancers and that compounds in the vegetables could kill cancer cells. But how the cruciferous veggies worked their medical magic was a mystery until now, because researchers have figured out just what broccoli does that helps keep cancer in check. The work appears in the Journal of Medicinal Chemistry.

Proteins coded by the gene1 p53 help keep cancer from starting to grow. But when the p53 gene is mutated, the protection is gone. Mutated p53 is implicated3 in about half of all human cancers.

Broccoli and its relatives are rich in compounds called isothiocyanates, or ITCs. And these ITCs apparently4 destroy the products of the mutant p53 gene, but leave the healthy p53 proteins alone and free to suppress tumor5 development.

The researchers write that “depletion of mutant p53 may reduce drug resistance and lead to new strategies for treating cancer in the clinic.” In the meantime, eat your broccoli!

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Steve Mirsky.


点击收听单词发音收听单词发音  

1 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。
2 broccoli 1sbzm     
n.绿菜花,花椰菜
参考例句:
  • She grew all the broccoli plants from seed.这些花椰菜都是她用种子培育出来的。
  • They think broccoli is only green and cauliflower is only white.他们认为西兰花只有绿色的,而菜花都是白色的。
3 implicated 8443a53107b44913ed0a3f12cadfa423     
adj.密切关联的;牵涉其中的
参考例句:
  • These groups are very strongly implicated in the violence. 这些组织与这起暴力事件有着极大的关联。 来自《简明英汉词典》
  • Having the stolen goods in his possession implicated him in the robbery. 因藏有赃物使他涉有偷盗的嫌疑。 来自《现代汉英综合大词典》
4 apparently tMmyQ     
adv.显然地;表面上,似乎
参考例句:
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
5 tumor fKxzm     
n.(肿)瘤,肿块(英)tumour
参考例句:
  • He was died of a malignant tumor.他死于恶性肿瘤。
  • The surgeons irradiated the tumor.外科医生用X射线照射那个肿瘤。
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