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SSS 2008-03-06

时间:2010-05-13 03:11来源:互联网 提供网友:0922013129   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 Steve Mirskey. Got a minute?

The lure1 of gold can be electric to some people even though the element is chemically inert2 on the large scale. But the researchers from Georgia Tech report that down at the level of atoms, gold can conduct electricity and act as an insulator3 as well. When an oxygen molecule4 was embedded5 into six-atom-long gold wire, the wire can conduct electricity. But when the wire is longer than six atoms, the oxygenated gold becomes an insulator. The scientists reported their discovery in the journal Physical Review Letters. The researchers say these properties mean that gold nano-wires might be used as sensors7 to detect motion in nano-scale situations, such as neurons or nanomachines--futuristic devices built from individual atoms that might enter cells and fight disease. The wire could be a sensor6 because when it’s extended even slightly it would switch from a conductor to an insulator. Using gold as a sensor in this way could never have been predicted from what has known about gold in bulk but being very small can lead to some very big changes.

 

Thanks for the minute for a Scientific American's 60-Second Science. I'm Steve Mirsky

 


点击收听单词发音收听单词发音  

1 lure l8Gz2     
n.吸引人的东西,诱惑物;vt.引诱,吸引
参考例句:
  • Life in big cities is a lure for many country boys.大城市的生活吸引着许多乡下小伙子。
  • He couldn't resist the lure of money.他不能抵制金钱的诱惑。
2 inert JbXzh     
adj.无活动能力的,惰性的;迟钝的
参考例句:
  • Inert gas studies are providing valuable information about other planets,too.对惰性气体的研究,也提供了有关其它行星的有价值的资料。
  • Elemental nitrogen is a very unreactive and inert material.元素氮是一个十分不活跃的惰性物质。
3 insulator b50xs     
n.隔离者;绝缘体
参考例句:
  • Few substances can equal fur as an insulator.作为绝缘体很少有其他材料能与动物皮毛相媲美。
  • A loose mulch acts on the surface as an insulator.疏松的覆盖物在土壤表面起了隔热的作用。
4 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
5 embedded lt9ztS     
a.扎牢的
参考例句:
  • an operation to remove glass that was embedded in his leg 取出扎入他腿部玻璃的手术
  • He has embedded his name in the minds of millions of people. 他的名字铭刻在数百万人民心中。
6 sensor sz7we     
n.传感器,探测设备,感觉器(官)
参考例句:
  • The temperature sensor is enclosed in a protective well.温度传感器密封在保护套管中。
  • He plugged the sensor into a outlet.他把传感器插进电源插座。
7 sensors 029aee483db9ae244d7a5cb353e74602     
n.传感器,灵敏元件( sensor的名词复数 )
参考例句:
  • There were more than 2000 sensors here. 这里装有两千多个灵敏元件。 来自《简明英汉词典》
  • Significant changes have been noted where sensors were exposed to trichloride. 当传感器暴露在三氯化物中时,有很大变化。 来自辞典例句
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