星际空间中探测到手性分子
文章来源:未知 文章作者:enread 发布时间:2016-06-16 08:14 字体: [ ]  进入论坛
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Like a pair of human hands, certain organic molecules2 have mirror-image versions of themselves, a chemical property known as chirality. These so-called "handed" molecules are essential for biology and have intriguingly3 been found in meteorites4 on Earth and comets in our Solar System. None, however, has been detected in the vast reaches of interstellar space, until now. A team of scientists using highly sensitive radio telescopes has discovered the first complex organic chiral molecule1 in interstellar space. The molecule, propylene oxide5 (CH3CHOCH2), was found near the center of our Galaxy6 in an enormous star-forming cloud of dust and gas known as Sagittarius B2 (Sgr B2).
 
The research was undertaken primarily with the National Science Foundation's Green Bank Telescope (GBT) in West Virginia as part of the Prebiotic Interstellar Molecular7 Survey. Additional supporting observations were taken with the Parkes radio telescope in Australia.
 
"This is the first molecule detected in interstellar space that has the property of chirality, making it a pioneering leap forward in our understanding of how prebiotic molecules are made in the Universe and the effects they may have on the origins of life," said Brett McGuire, a chemist and Jansky Postdoctoral Fellow with the National Radio Astronomy Observatory8 (NRAO) in Charlottesville, Virginia. 
 
"Propylene oxide is among the most complex and structurally9 intricate molecules detected so far in space," said Brandon Carroll, a chemistry graduate student at the California Institute of Technology in Pasadena. "Detecting this molecule opens the door for further experiments determining how and where molecular handedness emerges and why one form may be slightly more abundant than the other."
 
McGuire and Carroll share first authorship on a paper published today in the journal Science. They also are presenting their results at the American Astronomical10 Society meeting in San Diego, California.


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1 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈?f婘??妈?成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
2 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。
3 intriguingly bad4b759a0f1d6431273da89bebb4008     
参考例句:
  • Intriguingly, she gave to the music a developed although oddly malleable personality. 最神奇的是,她的音乐具有成熟却又很奇怪地极富可塑性。 来自互联网
  • Intriguingly, the patients brains were riddled with tangles, but not amyloid plaques. 有趣的是,患者的大脑中充满了各缠结,但并没有粉斑。 来自互联网
4 meteorites 12efd1ed528a28fe1f7cb667a7fbc1e0     
n.陨星( meteorite的名词复数 )
参考例句:
  • Small meteorites have left impact craters all over the planet's surface. 这个行星的表面布满了小块陨石留下的撞击坑。 来自《简明英汉词典》
  • One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites. 地球外存在生命的理论是基于陨星上存在碳化合物质这一事实的。 来自《简明英汉词典》
5 oxide K4dz8     
n.氧化物
参考例句:
  • Oxide is usually seen in our daily life.在我们的日常生活中氧化物很常见。
  • How can you get rid of this oxide coating?你们该怎样除去这些氧化皮?
6 galaxy OhoxB     
n.星系;银河系;一群(杰出或著名的人物)
参考例句:
  • The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
  • The company has a galaxy of talent.该公司拥有一批优秀的人才。
7 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。
8 observatory hRgzP     
n.天文台,气象台,瞭望台,观测台
参考例句:
  • Guy's house was close to the observatory.盖伊的房子离天文台很近。
  • Officials from Greenwich Observatory have the clock checked twice a day.格林威治天文台的职员们每天对大钟检查两次。
9 structurally b9ab462aabf667bfba00ea360ed6c929     
在结构上
参考例句:
  • The house roof was (structurally) unsound. 这屋顶(结构)不牢固。
  • Pinhole on shot-hole damage is never structurally significant. 针孔和蛀洞所造成的危害对结构的影响不大。
10 astronomical keTyO     
adj.天文学的,(数字)极大的
参考例句:
  • He was an expert on ancient Chinese astronomical literature.他是研究中国古代天文学文献的专家。
  • Houses in the village are selling for astronomical prices.乡村的房价正在飙升。
TAG标签: space molecules organic
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