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SSS 2009-01-02

时间:2010-05-17 01:52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 Cynthia Graber. This will just take a minute.

 

Mosquitoes carry nasty diseases—dengue fever, west nile, malaria1. But the microbes that cause those diseases don’t attach themselves to the mosquitoes and then immediately latch2 onto their next victim. They need time to grow and replicate3 in the mosquito before migrating to the bug’s salivary4 glands5. For example, the dengue fever virus takes about two weeks to incubate.

So researchers from the University of Queensland in Australia and Central China Normal University are looking at a way to shorten the lives of mosquitoes—and thus curtail6 their disease-transmitting ability.

Researchers worked with a bacterial7 parasite8 called Wolbachia that infects numerous insect species. They spent three years adapting it to infect the Aedes aegypti mosquito, which carries dengue fever. It cut the lives of the mosquitoes by more than half. Those results were reported in the January 2nd issue of the journal Science. The scientists say that because Wolbachia shortens a mosquito’s life, the insects are that much less likely to pass on the diseases they carry. So a relatively9 inexpensive and effective human disease prevention program could be to mass-infect mosquitoes with Wolbachia. Which should make the medical community buzz.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.

 


点击收听单词发音收听单词发音  

1 malaria B2xyb     
n.疟疾
参考例句:
  • He had frequent attacks of malaria.他常患疟疾。
  • Malaria is a kind of serious malady.疟疾是一种严重的疾病。
2 latch g2wxS     
n.门闩,窗闩;弹簧锁
参考例句:
  • She laid her hand on the latch of the door.她把手放在门闩上。
  • The repairman installed an iron latch on the door.修理工在门上安了铁门闩。
3 replicate PVAxN     
v.折叠,复制,模写;n.同样的样品;adj.转折的
参考例句:
  • The DNA of chromatin must replicate before cell division.染色质DNA在细胞分裂之前必须复制。
  • It is also easy to replicate,as the next subsection explains.就像下一个小节详细说明的那样,它还可以被轻易的复制。
4 salivary xCSzA     
adj. 唾液的
参考例句:
  • Small doses depress salivary and bronchial secretion and sweating. 小剂量可抑制唾液分泌、支气管分泌及出汗。
  • The five pairs of salivary glands open into the mouth. 有五对唾液腺通向口腔。
5 glands 82573e247a54d4ca7619fbc1a5141d80     
n.腺( gland的名词复数 )
参考例句:
  • a snake's poison glands 蛇的毒腺
  • the sebaceous glands in the skin 皮脂腺
6 curtail TYTzO     
vt.截短,缩短;削减
参考例句:
  • The government hopes to curtail public spending.政府希望缩减公共事业开支。
  • The minister had to curtail his visit.部长不得不缩短访问日期。
7 bacterial dy5z8q     
a.细菌的
参考例句:
  • Bacterial reproduction is accelerated in weightless space. 在失重的空间,细菌繁殖加快了。
  • Brain lesions can be caused by bacterial infections. 大脑损伤可能由细菌感染引起。
8 parasite U4lzN     
n.寄生虫;寄生菌;食客
参考例句:
  • The lazy man was a parasite on his family.那懒汉是家里的寄生虫。
  • I don't want to be a parasite.I must earn my own way in life.我不想做寄生虫,我要自己养活自己。
9 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
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