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SSS 2008-05-02

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Podcast is sponsored from the People of American Chemistry who provide the plastics, medicines and innovations that make life modern. Learn more at americanchemistry.com.

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This'll just take a minute.

Sharks inspire fear as great predators1, but their numbers are declining around the world. One way sharks occasionally meet their doom2 is by getting tangled3 up in long-line fishing gear. And they can eat the bait set out for the desired fish which makes fishing less efficient and more expensive. But scientists at the National Oceanic and Atmospheric4 Administration recently noticed something unusual. They reported their findings at a workshop on shark deterrence5. Some metals react with sea water to create electrical field. And the researchers saw that captive sharks were avoiding areas around one such metal--palladium neodymium. So they thought why not use this finding to help save sharks in the wild and protect the fishing industry? Sharks are sensitive to electrical fields which they use both to find food and to help them navigate6 through the ocean. It's believed that the electrical fields created by palladium neodymium make sharks back off because they somehow overload7 the animals' sensory8 systems. Researchers say the next step is to test whether small ingots of metal in seawater consistently repel9 animals in the lab. If so, they would then incorporate the metal into shark-repelling fishing lines.

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


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1 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
2 doom gsexJ     
n.厄运,劫数;v.注定,命定
参考例句:
  • The report on our economic situation is full of doom and gloom.这份关于我们经济状况的报告充满了令人绝望和沮丧的调子。
  • The dictator met his doom after ten years of rule.独裁者统治了十年终于完蛋了。
3 tangled e487ee1bc1477d6c2828d91e94c01c6e     
adj. 纠缠的,紊乱的 动词tangle的过去式和过去分词
参考例句:
  • Your hair's so tangled that I can't comb it. 你的头发太乱了,我梳不动。
  • A movement caught his eye in the tangled undergrowth. 乱灌木丛里的晃动引起了他的注意。
4 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
5 deterrence d230b01f8463627e6282c5e0e4f1c166     
威慑,制止; 制止物,制止因素; 挽留的事物; 核威慑
参考例句:
  • An extreme school of "disarmers" pronounced stable deterrence was a dangerous deception. “裁军论者”中的极端派声称,稳定的威摄是一种危险的骗局。
  • Escalation is thus an aspect of deterrence and of crisis management. 因此逐步升级是威慑和危机处理的一个方面。
6 navigate 4Gyxu     
v.航行,飞行;导航,领航
参考例句:
  • He was the first man to navigate the Atlantic by air.他是第一个飞越大西洋的人。
  • Such boats can navigate on the Nile.这种船可以在尼罗河上航行。
7 overload RmHz40     
vt.使超载;n.超载
参考例句:
  • Don't overload the boat or it will sink.别超载,否则船会沉。
  • Large meals overload the digestive system.吃得太饱会加重消化系统的负担。
8 sensory Azlwe     
adj.知觉的,感觉的,知觉器官的
参考例句:
  • Human powers of sensory discrimination are limited.人类感官分辨能力有限。
  • The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。
9 repel 1BHzf     
v.击退,抵制,拒绝,排斥
参考例句:
  • A country must have the will to repel any invader.一个国家得有决心击退任何入侵者。
  • Particles with similar electric charges repel each other.电荷同性的分子互相排斥。
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TAG标签:   SSS  sensory
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