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托福听力练习-科学美国人60秒:蚊子喜欢脚的气味

2017-05-04 14:14:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：蚊子喜欢脚的气味

　　科学美国人60秒听力练习：蚊子喜欢脚的气味

　　科学美国人60秒英文文本

　　African Anopheles mosquitoes find us by our carbondioxide–rich exhalation. But when they get closethey turn away from our heads and dive for our feet—apparently their preferred snack spot.

　　Biologist Remco Suer believes he’s figured it themosquito behavior, for his doctoral thesis atWageningen University in the Netherlands. And theanswer might help in the fight against malaria.

　　Previous research identified odors produced by 10 bacteria that live on human feet and that, in combination, are attractive to mosquitoes at close range. Suer's work shows that nine outof 10 of these odors are picked up by olfactory neurons under hairlike structures on themosquitoes' mouthparts. Right nearby are some other key neurons—that recognize our CO2 from further away.

　　Suer discovered that five different bacteria scents, when isolated from the mix, actually blockthose CO2 neurons from doing their job. So if the bacterial odor molecule is present, the CO2 sniffers turn off, presumably to allow the mosquito to concentrate on the close-range foottarget.

　　Suer imagines traps baited with these feet bacteria to attract mosquitoes and catch thembefore they can bite. It’s the next best thing to stepping on them.

　　—Cynthia Graber

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本文关键字: 托福听力 科学美国人60秒

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