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SSS 2009-01-19

时间:2010-05-17 02:47来源:互联网 提供网友:木渐浅。   字体: [ ]
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute.

 

A new study with worms shows that some have a gene1 that helps them stave off infections. Not through some kind of biochemistry—but by changing their behavior.

Scientists were studying two strains of the roundworm C. elegans, one strain that is commonly used in the laboratory, another that was isolated2 in Hawaii. The laboratory strain got fewer infections than the Hawaiian strain. That’s because the lab worms have a particular version of a gene called NPR-1. But the way the gene works is a bit of a surprise. You might think that a gene involved in fighting infections must somehow enhance an animal’s immune response.

But you would be wrong. Because a current study, published in the January 16th issue of Science, shows that’s not the case. Instead, the scientists showed that the NPR gene found in healthier worms made them picky about their location. They stayed clear of places where oxygen is scarce. As it happens, those are the neighborhoods where bacteria hang out, including the bugs3 that can cause disease. So the gene made the worms prefer germ-free locales.

So, take a tip from a worm. If you want to avoid what’s out there this winter, just don’t go out there.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.

 


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 isolated bqmzTd     
adj.与世隔绝的
参考例句:
  • His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
  • Patients with the disease should be isolated. 这种病的患者应予以隔离。
3 bugs e3255bae220613022d67e26d2e4fa689     
adj.疯狂的,发疯的n.窃听器( bug的名词复数 );病菌;虫子;[计算机](制作软件程序所产生的意料不到的)错误
参考例句:
  • All programs have bugs and need endless refinement. 所有的程序都有漏洞,都需要不断改进。 来自《简明英汉词典》
  • The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
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