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SSS 2008-12-22

时间:2010-05-15 07:59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 Karen Hopkin. This will just take a minute.

 

For those of you who’ve spent many of your waking hours this winter washing your hands and fretting1 about getting sick, you might be better off just staying in bed. Because scientists from Stanford University have found that the immune system works best after dark.

The scientists were studying fruit flies, which are active at dawn and dusk, and sleep through the night like you and me. The circadian rhythm that tells these critters, and many others, when to snooze and when to cruise, controls lots of bodily functions. So the scientists got to wondering whether it also regulates the immune system and the fly’s ability to fight infections. Yes, even fruit flies can catch some pretty nasty bugs2. Which the scientists proceeded to demonstrate.

They took a bunch of flies and infected them with some unsavory bacteria. Half the flies were infected while they slept, half while they were awake. Turns out that the flies that were infected at night were better able to battle their bugs than flies who got sick during the day, results presented at the American Society for Cell Biology meeting in San Francisco on December 14th. Whether human immunity3 is also better during sleep isn’t yet known. But Shakespeare might have been onto something when he called sleep “nature’s soft nurse.”

 

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 fretting fretting     
n. 微振磨损 adj. 烦躁的, 焦虑的
参考例句:
  • Fretting about it won't help. 苦恼于事无补。
  • The old lady is always fretting over something unimportant. 那位老妇人总是为一些小事焦虑不安。
2 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》
3 immunity dygyQ     
n.优惠;免除;豁免,豁免权
参考例句:
  • The law gives public schools immunity from taxation.法律免除公立学校的纳税义务。
  • He claims diplomatic immunity to avoid being arrested.他要求外交豁免以便避免被捕。
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TAG标签:   SSS  snooze
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