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SSS 2010-10-25

时间:2010-11-04 05:37来源:互联网 提供网友:ob8617   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 Cynthia Graber. This will just take a minute.

Take a deep breath. Taste anything? Actually, your lungs may, because scientists have discovered that the same receptors that exist on the tongue to taste bitter substances are also found on the smooth muscle of lungs.

Researchers were studying the receptors on smooth lung muscles that regulate contraction1 and relaxation2 of the airways3. That’s when they made the discovery which was so unexpected that the researchers themselves were skeptical4.

Finally, they became convinced that the receptors were really there, though were not clustered in taste buds as they are on the tongue. The scientists then exposed human and mouse airways to various bitter compounds to gauge5 the effects.

Many toxic6 compounds are bitter, so the researchers expect that the lung muscle to tense up and contract-- to compel the breather to move away from whatever is bitter and perhaps toxic. But, in a second surprise, bitter compounds relaxed and opened airways better than any existing asthma7 drug. The study is in the journal Nature Medicine.

Researchers will continue to search for the role of the receptors. Meanwhile, the work represents a surprising new lead in the search for drugs to treat asthma, emphysema or chronic8 bronchitis.

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Cynthia Graber.
 


点击收听单词发音收听单词发音  

1 contraction sn6yO     
n.缩略词,缩写式,害病
参考例句:
  • The contraction of this muscle raises the lower arm.肌肉的收缩使前臂抬起。
  • The forces of expansion are balanced by forces of contraction.扩张力和收缩力相互平衡。
2 relaxation MVmxj     
n.松弛,放松;休息;消遣;娱乐
参考例句:
  • The minister has consistently opposed any relaxation in the law.部长一向反对法律上的任何放宽。
  • She listens to classical music for relaxation.她听古典音乐放松。
3 AIRWAYS 5a794ea66d6229951550b106ef7caa7a     
航空公司
参考例句:
  • The giant jets that increasingly dominate the world's airways. 越来越称雄于世界航线的巨型喷气机。
  • At one point the company bought from Nippon Airways a 727 jet. 有一次公司从日本航空公司买了一架727型喷气机。
4 skeptical MxHwn     
adj.怀疑的,多疑的
参考例句:
  • Others here are more skeptical about the chances for justice being done.这里的其他人更为怀疑正义能否得到伸张。
  • Her look was skeptical and resigned.她的表情是将信将疑而又无可奈何。
5 gauge 2gMxz     
v.精确计量;估计;n.标准度量;计量器
参考例句:
  • Can you gauge what her reaction is likely to be?你能揣测她的反应可能是什么吗?
  • It's difficult to gauge one's character.要判断一个人的品格是很困难的。
6 toxic inSwc     
adj.有毒的,因中毒引起的
参考例句:
  • The factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
  • There is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。
7 asthma WvezQ     
n.气喘病,哮喘病
参考例句:
  • I think he's having an asthma attack.我想他现在是哮喘病发作了。
  • Its presence in allergic asthma is well known.它在过敏性气喘中的存在是大家很熟悉的。
8 chronic BO9zl     
adj.(疾病)长期未愈的,慢性的;极坏的
参考例句:
  • Famine differs from chronic malnutrition.饥荒不同于慢性营养不良。
  • Chronic poisoning may lead to death from inanition.慢性中毒也可能由虚弱导致死亡。
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