在线英语听力室

科学美国人60秒 SSS 美白牙条会改变牙齿中的蛋白质

时间:2019-09-29 07:10:41

搜索关注在线英语听力室公众号:tingroom,领取免费英语资料大礼包。

(单词翻译)

Whitening Strips Alter Proteins in Teeth

Of all the stuff you can buy on eBay - here's a new one: human teeth. "I think I probably averaged maybe $5 a tooth." Kelly Keenan, a biochemist at Stockton University in New Jersey1. Keenan chased down the chompers to investigate what whitening strips do to a tooth's chemical composition. So she stuck the teeth in styrofoam, applied2 the whitening strips per manufacturer instructions, and added some artificial saliva3: a liquid mixture at the pH and with salts you'd find in regular spit.

你能在eBay上买到的所有东西中,有一件是新的:人类的牙齿。“我想平均一颗牙大概5美元。”凯利·基南是新泽西州斯托克顿大学的生物化学家。基南追踪这些牙齿,研究美白牙条对牙齿化学成分的影响。所以她把牙齿放在泡沫塑料里,按照制造商的说明涂上美白贴片,并添加了一些人工唾液:pH值为液体的混合物,含有你在普通唾液中可以找到的盐分。

Treatments complete, she extracted proteins from the teeth. And found that the more rounds of whitening the teeth experienced, the fewer proteins she could recover—because hydrogen peroxide in the whitening strips was snipping4 chemical bonds."The bigger picture is that hydrogen peroxide can penetrate5 the enamel6 and dentin and it can cause your proteins to break down. And smaller pieces are removed from those proteins."

治疗结束后,她从牙齿中提取蛋白质。发现,牙齿美白的次数越多,能恢复的蛋白质就越少——因为美白牙条中的过氧化氢会切断化学键。“更重要的是过氧化氢可以穿透牙釉质和牙本质,导致蛋白质分解。更小的片段从这些蛋白质中移除。”

She and her undergraduate students presented on that research at the 2019 Experimental Biology meeting in Orlando. This is just a preliminary study for now. And the pulp7 of your teeth can replenish8 proteins in the dentin, though not the enamel—so it's unclear whether these effects would cause permanent damage in real, living teeth. One thing’s for sure: supplies of teeth for experiments seem to be plentiful9.

她和大学生在2019年奥兰多实验生物学会议上展示了这项研究。这只是目前的初步研究。牙齿的牙髓可以补充牙本质中的蛋白质,但不能补充牙釉质——所以目前还不清楚这些影响是否会对真实的牙齿造成永久性损伤。但有一件事是肯定的:用于实验的牙齿蛋白质含量似乎是充足的。

"I think I bought a set of 15. And the person's like, let me know if you need more. This person also claimed the teeth were from his mouth, which, you don't have that many more to go!"

“我想我买了一套15张的。如果你需要更多,告诉我。有的人声称牙齿来自自己的嘴巴,但是你已经没有那么多牙齿了!”


分享到:


点击收听单词发音收听单词发音  

1 jersey Lp5zzo     
n.运动衫
参考例句:
  • He wears a cotton jersey when he plays football.他穿运动衫踢足球。
  • They were dressed alike in blue jersey and knickers.他们穿着一致,都是蓝色的运动衫和灯笼短裤。
2 applied Tz2zXA     
adj.应用的;v.应用,适用
参考例句:
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
3 saliva 6Cdz0     
n.唾液,口水
参考例句:
  • He wiped a dribble of saliva from his chin.他擦掉了下巴上的几滴口水。
  • Saliva dribbled from the baby's mouth.唾液从婴儿的嘴里流了出来。
4 snipping 5fe0030e9f7f57e9e018d33196ee84b6     
n.碎片v.剪( snip的现在分词 )
参考例句:
  • The crew had been snipping it for souvenirs. 舰上人员把它剪下来当作纪念品。 来自辞典例句
  • The gardener is snipping off the dead leaves in the garden. 花匠在花园时剪枯叶。 来自互联网
5 penetrate juSyv     
v.透(渗)入;刺入,刺穿;洞察,了解
参考例句:
  • Western ideas penetrate slowly through the East.西方观念逐渐传入东方。
  • The sunshine could not penetrate where the trees were thickest.阳光不能透入树木最浓密的地方。
6 enamel jZ4zF     
n.珐琅,搪瓷,瓷釉;(牙齿的)珐琅质
参考例句:
  • I chipped the enamel on my front tooth when I fell over.我跌倒时门牙的珐琅质碰碎了。
  • He collected coloured enamel bowls from Yugoslavia.他藏有来自南斯拉夫的彩色搪瓷碗。
7 pulp Qt4y9     
n.果肉,纸浆;v.化成纸浆,除去...果肉,制成纸浆
参考例句:
  • The pulp of this watermelon is too spongy.这西瓜瓤儿太肉了。
  • The company manufactures pulp and paper products.这个公司制造纸浆和纸产品。
8 replenish kCAyV     
vt.补充;(把…)装满;(再)填满
参考例句:
  • I always replenish my food supply before it is depleted.我总是在我的食物吃完之前加以补充。
  • We have to import an extra 4 million tons of wheat to replenish our reserves.我们不得不额外进口四百万吨小麦以补充我们的储备。
9 plentiful r2izH     
adj.富裕的,丰富的
参考例句:
  • Their family has a plentiful harvest this year.他们家今年又丰收了。
  • Rainfall is plentiful in the area.这个地区雨量充足。

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。