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SSS 2008-10-23

时间:2010-05-15 02:59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.

 

Animals rely on all sorts of cues to find their next meal. Monkeys and birds are attracted to the colors of ripe fruits and berries. And snakes find their prey1 by sensing heat. Now a team of Canadian scientists finds that some insects can do the same thing, sensing the infrared2 radiation emitted by, of all things, pine cones3.

These seed-eating bugs4 are not the first known to home in on heat when they’re looking for food. Some blood-sucking bugs can sense the temperature of their warm-blooded hosts. But this study, published on October 22nd in the Royal Society journal Biological Sciences, is the first to find that insects can use infrared to find their favorite plants.

Pine cones, it turns out, run about 15 degrees warmer than the pine needles that surround them. In fact, the cones radiate so strongly in the infrared that they show up like candles on a Christmas tree. The bugs, which nosh on conifer seeds, can locate the toasty, seed-bearing cones thanks to special infrared receptors on their abdomens5. When the scientists covered up those receptors, the insects couldn’t see the forest or the trees. And the male insects probably won’t even stop to ask for directions.

 

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 prey g1czH     
n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨
参考例句:
  • Stronger animals prey on weaker ones.弱肉强食。
  • The lion was hunting for its prey.狮子在寻找猎物。
2 infrared dx0yp     
adj./n.红外线(的)
参考例句:
  • Infrared is widely used in industry and medical science.红外线广泛应用于工业和医学科学。
  • Infrared radiation has wavelengths longer than those of visible light.红外辐射的波长比可见光的波长长。
3 cones 1928ec03844308f65ae62221b11e81e3     
n.(人眼)圆锥细胞;圆锥体( cone的名词复数 );球果;圆锥形东西;(盛冰淇淋的)锥形蛋卷筒
参考例句:
  • In the pines squirrels commonly chew off and drop entire cones. 松树上的松鼠通常咬掉和弄落整个球果。 来自辞典例句
  • Many children would rather eat ice cream from cones than from dishes. 许多小孩喜欢吃蛋卷冰淇淋胜过盘装冰淇淋。 来自辞典例句
4 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》
5 abdomens b9e50973be51757dee66d69ffb4312e6     
n.腹(部)( abdomen的名词复数 )
参考例句:
  • The women especially disliked their stomachs or abdomens, hips, thighs and legs. 这些妇女特别不喜欢自己的胃部,腹部,臀部,大腿,腿部。 来自互联网
  • They danced not with their legs or arms, but with their entire bodies, undulating their abdomens. 他们跳舞不是用腿和臂,而是用整个身子,腹部一起一伏地扭动着。 来自互联网
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