SSS 2012-03-07
时间：2019-01-08 作者：英语课 分类：Scientific American(三)月
英语课
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 molecules 1 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 molecular 2 chains dangle 3 from the primary structure. When two pieces of the cut hydrogel are pressed together in an acidic solution, the side chains of each piece tangle 4 up to weld the parts together. The work is in the Proceedings 5 of the National Academy of Sciences。
These hydrogels could seal up industrial acid leakages 6 and contribute to self-healing plastics. In the acidic environment of the stomach, they could bandage holes or deliver drugs to ulcers 7. 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
分子( molecule的名词复数 )
- 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。
adj.分子的；克分子的
- 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。
v.(使)悬荡，(使)悬垂
- 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。
n.纠缠；缠结；混乱；v.(使)缠绕；变乱
- 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。
n.进程，过程，议程；诉讼(程序)；公报
- 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
泄露； 漏( leakage的名词复数 )； 漏出； 漏出物； 渗漏物
- 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。