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SSS 2009-04-24

时间:2010-05-17 08:12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-Sencond Science. I am Karen Hopkin. This will just take a minute.

When you think about silk, you probably think of gossamer1 fibers3 woven into lustrous4 garments or decadently5 soft bedsheets. But silk is also prized for its strength. Mechanically speaking, silk fibers are as tough as steel. But in the April 24th issue of Science, German researchers report that a dusting of metal makes silk even tougher.

In nature, lots of insects and animals use a touch of metal to harden body parts such as jaws6, claws, and stingers. So the scientists got to wondering whether they could take a similar tactic7 to make silk even stronger. Such reinforced fibers could prove useful for making really sturdy medical devices, like surgical8 sutures, or even artificial tissues like bone or tendon or even arteries9.

The scientists used a process called atomic layer deposition10 to coat some spider silk with zinc11, titanium or aluminum12. In addition to covering the outside of the silk, some of the metals seeped13 into the material, incorporating into the structure of the fiber2. And, it will probably come as no surprise that the fibers infused with titanium or zinc or aluminum are much harder to break than Original Recipe silk. As the old adage14 almost goes, O, what a stronger web we weave, when bits of metal to the silk we cleave15.

Thanks for the minute. For  Scientific American’s 60-Sencond Science. I am Karen Hopkin.
 


点击收听单词发音收听单词发音  

1 gossamer ufQxj     
n.薄纱,游丝
参考例句:
  • The prince helped the princess,who was still in her delightful gossamer gown.王子搀扶着仍穿著那套美丽薄纱晚礼服的公主。
  • Gossamer is floating in calm air.空中飘浮着游丝。
2 fiber NzAye     
n.纤维,纤维质
参考例句:
  • The basic structural unit of yarn is the fiber.纤维是纱的基本结构单元。
  • The material must be free of fiber clumps.这种材料必须无纤维块。
3 fibers 421d63991f1d1fc8826d6e71d5e15f53     
光纤( fiber的名词复数 ); (织物的)质地; 纤维,纤维物质
参考例句:
  • Thesolution of collagen-PVA was wet spined with the sodium sulfate as coagulant and collagen-PVA composite fibers were prepared. 在此基础上,以硫酸钠为凝固剂,对胶原-PVA共混溶液进行湿法纺丝,制备了胶原-PVA复合纤维。
  • Sympathetic fibers are distributed to all regions of the heart. 交感神经纤维分布于心脏的所有部分。
4 lustrous JAbxg     
adj.有光泽的;光辉的
参考例句:
  • Mary has a head of thick,lustrous,wavy brown hair.玛丽有一头浓密、富有光泽的褐色鬈发。
  • This mask definitely makes the skin fair and lustrous.这款面膜可以异常有用的使肌肤变亮和有光泽。
5 decadently ab0c56d7210f211f962d41ffca5ecb31     
堕落的,颓废的; 文艺颓废期的,颓废派的; 衰微的
参考例句:
  • Don't let decadent ideas eat into yourselves. 别让颓废的思想侵蚀你们。
  • Bullfighting was left with the new decadent method, the almost impossible technique. 他们留给斗牛事业的遗产是:堕落的新方法令人生厌的技艺。
6 jaws cq9zZq     
n.口部;嘴
参考例句:
  • The antelope could not escape the crocodile's gaping jaws. 那只羚羊无法从鱷鱼张开的大口中逃脱。
  • The scored jaws of a vise help it bite the work. 台钳上有刻痕的虎钳牙帮助它紧咬住工件。
7 tactic Yqowc     
n.战略,策略;adj.战术的,有策略的
参考例句:
  • Reducing prices is a common sales tactic.降价是常用的销售策略。
  • She had often used the tactic of threatening to resign.她惯用以辞职相威胁的手法。
8 surgical 0hXzV3     
adj.外科的,外科医生的,手术上的
参考例句:
  • He performs the surgical operations at the Red Cross Hospital.他在红十字会医院做外科手术。
  • All surgical instruments must be sterilised before use.所有的外科手术器械在使用之前,必须消毒。
9 arteries 821b60db0d5e4edc87fdf5fc263ba3f5     
n.动脉( artery的名词复数 );干线,要道
参考例句:
  • Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
  • This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》
10 deposition MwOx4     
n.免职,罢官;作证;沉淀;沉淀物
参考例句:
  • It was this issue which led to the deposition of the king.正是这件事导致了国王被废黜。
  • This leads to calcium deposition in the blood-vessels.这导致钙在血管中沉积。
11 zinc DfxwX     
n.锌;vt.在...上镀锌
参考例句:
  • Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。
  • Zinc is used to protect other metals from corrosion.锌被用来保护其他金属不受腐蚀。
12 aluminum 9xhzP     
n.(aluminium)铝
参考例句:
  • The aluminum sheets cannot be too much thicker than 0.04 inches.铝板厚度不能超过0.04英寸。
  • During the launch phase,it would ride in a protective aluminum shell.在发射阶段,它盛在一只保护的铝壳里。
13 seeped 7b1463dbca7bf67e984ebe1b96df8fef     
v.(液体)渗( seep的过去式和过去分词 );渗透;渗出;漏出
参考例句:
  • The rain seeped through the roof. 雨水透过房顶渗透。 来自《简明英汉词典》
  • Icy air seeped in through the paper and the room became cold. 寒气透过了糊窗纸。屋里骤然冷起来。 来自汉英文学 - 家(1-26) - 家(1-26)
14 adage koSyd     
n.格言,古训
参考例句:
  • But the old adage that men grow into office has not proved true in my experience.但是,根据我的经验,人们所谓的工作岗位造就人材这句古话并不正确。
  • Her experience lends credence to the adage " We live and learn!"她的经验印证了一句格言: 活到老,学到老!
15 cleave iqJzf     
v.(clave;cleaved)粘着,粘住;坚持;依恋
参考例句:
  • It examines how the decision to quit gold or to cleave to it affected trade policies.论文分析了放弃或坚持金本位是如何影响贸易政策的。
  • Those who cleave to the latter view include many conservative American politicians.坚持后一种观点的大多是美国的保守派政客。
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