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SSS 2008-11-19

时间:2010-05-15 06:36来源:互联网 提供网友:木渐浅。   字体: [ ]
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This podcast is brought to you by the American Chemical Society. The global challenges chemistry solutions podcast from ACS discusses how chemistry researchers critical in solving some of the world's most daunting1 problems, concerning energy, food and water. Go to ACS.org for more information.

 

 This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute.

 

Truth in advertising2 is a questionable3 concept, because it’s often self-serving to lie. Whether you’re talking about a used car salesman or a poisonous snake. No, they’re not the same thing.

In the natural world there are poisonous creatures that advertise their unpalatability with bright colors. Then there are other critters that try to protect themselves by merely mimicking4 the bright coloration of creatures that produce nasty toxins6—but without actually expending7 the energy on making the toxins themselves. These mimics8 are hoping to get by by lying about being a bad meal. But what about the beasties that really are filled with poison. Can they lie, too? Maybe save a little energy by producing a less colorful display?

Well, scientists from the U.K. say, it looks like they can’t. See, when an animal makes a toxin5, it also makes an antitoxin to keep it from poisoning itself. And those antitoxins are usually antioxidants, which also double as pigments9. So the more toxic10 a critter is, the more antioxidants it needs, and the more honestly flamboyant11 its outfit12, results published by the Royal Society on November 19th. So next time you run into a yellow-banded poison dart13 frog, remember, what you see is what you get.

 

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 daunting daunting     
adj.使人畏缩的
参考例句:
  • They were faced with the daunting task of restoring the house.他们面临着修复房子的艰巨任务。
  • Starting a new job can be a daunting prospect.开始一项新工作有时会让人望而却步。
2 advertising 1zjzi3     
n.广告业;广告活动 a.广告的;广告业务的
参考例句:
  • Can you give me any advice on getting into advertising? 你能指点我如何涉足广告业吗?
  • The advertising campaign is aimed primarily at young people. 这个广告宣传运动主要是针对年轻人的。
3 questionable oScxK     
adj.可疑的,有问题的
参考例句:
  • There are still a few questionable points in the case.这个案件还有几个疑点。
  • Your argument is based on a set of questionable assumptions.你的论证建立在一套有问题的假设上。
4 mimicking ac830827d20b6bf079d24a8a6d4a02ed     
v.(尤指为了逗乐而)模仿( mimic的现在分词 );酷似
参考例句:
  • She's always mimicking the teachers. 她总喜欢模仿老师的言谈举止。
  • The boy made us all laugh by mimicking the teacher's voice. 这男孩模仿老师的声音,逗得我们大家都笑了。 来自辞典例句
5 toxin hn5wb     
n.毒素,毒质
参考例句:
  • Experts have linked this condition to a build-up of toxins in the body.专家已把这一病症与体内毒素的积累联系起来。
  • Tests showed increased levels of toxin in shellfish.检验表明水生有壳动物的毒素水平提高了。
6 toxins 18c3f40d432ba8dc33bad8fb82873ea8     
n.毒素( toxin的名词复数 )
参考例句:
  • The seas have been used as a receptacle for a range of industrial toxins. 海洋成了各种有毒工业废料的大容器。
  • Most toxins are naturally excreted from the body. 大部分毒素被自然排出体外。 来自《简明英汉词典》
7 expending 2bc25f0be219ef94a9ff43e600aae5eb     
v.花费( expend的现在分词 );使用(钱等)做某事;用光;耗尽
参考例句:
  • The heart pumps by expending and contracting of muscle. 心脏通过收缩肌肉抽取和放出(血液)。 来自互联网
  • Criminal action is an action of expending cost and then producing profit. 刑事诉讼是一种需要支付成本、能够产生收益的活动。 来自互联网
8 mimics f8207fb5fa948f536c5186311e3e641d     
n.模仿名人言行的娱乐演员,滑稽剧演员( mimic的名词复数 );善于模仿的人或物v.(尤指为了逗乐而)模仿( mimic的第三人称单数 );酷似
参考例句:
  • Methods:Models were generate by CT scan,Mimics software and Abaqus software. 方法:采用CT扫描,Mimics软件和Abaqus软件的CAD进行三维有限元模型的创建。 来自互联网
  • Relaxing the mind and body mimics the effect that some blood-pressure pills would have. 放松身心会产生某些降压药才能产生的效果。 来自辞典例句
9 pigments 90c719a2ef7a786d9af119297e63a36f     
n.(粉状)颜料( pigment的名词复数 );天然色素
参考例句:
  • The Romans used natural pigments on their fabrics and walls. 古罗马人在织物和墙壁上使用天然颜料。 来自辞典例句
  • The original white lead pigments have oxidized and turned black. 最初的白色铅质颜料氧化后变成了黑色。 来自辞典例句
10 toxic inSwc     
adj.有毒的,因中毒引起的
参考例句:
  • The factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
  • There is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。
11 flamboyant QjKxl     
adj.火焰般的,华丽的,炫耀的
参考例句:
  • His clothes were rather flamboyant for such a serious occasion.他的衣着在这种严肃场合太浮夸了。
  • The King's flamboyant lifestyle is well known.国王的奢华生活方式是人尽皆知的。
12 outfit YJTxC     
n.(为特殊用途的)全套装备,全套服装
参考例句:
  • Jenney bought a new outfit for her daughter's wedding.珍妮为参加女儿的婚礼买了一套新装。
  • His father bought a ski outfit for him on his birthday.他父亲在他生日那天给他买了一套滑雪用具。
13 dart oydxK     
v.猛冲,投掷;n.飞镖,猛冲
参考例句:
  • The child made a sudden dart across the road.那小孩突然冲过马路。
  • Markov died after being struck by a poison dart.马尔科夫身中毒镖而亡。
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