英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2012-03-07

时间:2012-04-16 05:48来源:互联网 提供网友:gmeng   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

 This is Scientific American 60 second Science, I am Sophie Bushwick, got a minute~

 
They’re called hydogels: Jell-O-like materials made of networks of long-chain molecules1 in water. And they’re as flexible as living tissue. But hydrogels could not recover from a cut—until now. Bioengineers at U.C. San Diego have made hydrogels that are self-healing in acidic conditions.
 
When you cut open a piece of hydrogel, the polymers that normally entwine to hold the gel together cannot grasp each another again, leaving the wound unhealed. But in the new gels, additional molecular2 chains dangle3 from the primary structure. When two pieces of the cut hydrogel are pressed together in an acidic solution, the side chains of each piece tangle4 up to weld the parts together. The work is in the Proceedings5 of the National Academy of Sciences。
 
These hydrogels could seal up industrial acid leakages6 and contribute to self-healing plastics. In the acidic environment of the stomach, they could bandage holes or deliver drugs to ulcers7. The researchers are trying to make gels that mend at a range of pH levels. They may look like desserts, but self-healing hydrogels could be a medical main course.
 
Thanks for the minute for Scientific American 60 second Science. I'm Sophie Bushwick
 
Vocabulary:
 
entwine:to become twisted or twined 
 
dangle:to hang loosely and usually so as to be able to swing freely 
 
tangle: to unite or knit together in intricate confusion 
 
weld:to unite (metallic parts) by heating and allowing the metals to flow together or by hammering or compressing with or without previous heating

点击收听单词发音收听单词发音  

1 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
2 molecular mE9xh     
adj.分子的;克分子的
参考例句:
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
3 dangle YaoyV     
v.(使)悬荡,(使)悬垂
参考例句:
  • At Christmas,we dangle colored lights around the room.圣诞节时,我们在房间里挂上彩灯。
  • He sits on the edge of the table and dangles his legs.他坐在桌子边上,摆动著双腿。
4 tangle yIQzn     
n.纠缠;缠结;混乱;v.(使)缠绕;变乱
参考例句:
  • I shouldn't tangle with Peter.He is bigger than me.我不应该与彼特吵架。他的块头比我大。
  • If I were you, I wouldn't tangle with them.我要是你,我就不跟他们争吵。
5 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
6 leakages 36373042d7bcef17373f6410c1bd165a     
泄露; 漏( leakage的名词复数 ); 漏出; 漏出物; 渗漏物
参考例句:
  • We can see that the flow has both leakages from it and injection into it. 我们就可以看到,这个流量既有漏出的又有注入的。
  • We can see that the flow has both leakages from it and injections into it. 我们就可以看到,这个流量是既有漏出的又有注入的。
7 ulcers CfBzhM     
n.溃疡( ulcer的名词复数 );腐烂物;道德败坏;腐败
参考例句:
  • Detachment of the dead cells produces erosions and ulcers. 死亡细胞的脱落,产生糜烂和溃疡。 来自辞典例句
  • 75% of postbulbar ulcers occur proximal to the duodenal papilla. 75%的球后溃疡发生在十二指肠乳头近侧。 来自辞典例句
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   sss  托福素材
顶一下
(1)
100%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴