File:Chirality with hands.svg
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[编辑]描述Chirality with hands.svg |
English: Amino Acid Chirality chirality with hands from http://www.nai.arc.nasa.gov/ A "chiral" molecule is one that is not superposable with its mirror image. Like left and right hands that have a thumb, fingers in the same order, but are mirror images and not the same, chiral molecules have the same things attached in the same order, but are mirror images and not the same. Although most amino acids can exist in both left and right handed forms, Life on Earth is made of left handed amino acids, almost exclusively. No one knows why this is the case. However, Drs. John Cronin and Sandra Pizzarello have shown that some of the amino acids that fall to earth from space are more left than right. Thus, the fact that we are made of L amino acids may be because of amino acids from space. Why do amino acids in space favor L? No one really knows, but it is known that radiation can also exist in left and right handed forms. So, there is a theory called the Bonner hypothesis, that proposes that left handed radiation in space (from a rotating neutron star for example) could lead to left handed amino acids in space, which would explain the left handed amino acids in meteorites. This is still speculative but our paper makes it much more plausible. In fact, this observations was one of the main reasons why we pursued this research. Although there were theories about how the amino acids could form in space in the ice, no one had shown that it was viable to make amino acids this way, until now.
ಕನ್ನಡ: ಸತೆರೆಒಚಹೆಮಿಸತರಯ |
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原作者: 未知 矢量: -- πϵρήλιο |
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[编辑]This image is a derivative work of the following images:
- File:Chirality with hands.jpg licensed with PD-USGov-NASA
- 2008-03-06T14:40:50Z Jacopo Werther 250x170 (14848 Bytes) {{Information |Description= Amino Acid Chirality chirality with hands from http://www.nai.arc.nasa.gov/ A "chiral" molecule is one that is not superimposable with its mirror image. Like left and right hands that have a thumb
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当前 | 2019年9月9日 (一) 18:33 | ![]() | 765 × 519(7 KB) | Perhelion(留言 | 贡献) | SVG valid now |
2011年10月23日 (日) 16:04 | ![]() | 765 × 519(7 KB) | Perhelion(留言 | 贡献) | minor tweak | |
2011年10月22日 (六) 17:12 | ![]() | 765 × 519(8 KB) | Perhelion(留言 | 贡献) | +fill -edge saturation | |
2011年10月22日 (六) 12:22 | ![]() | 765 × 519(9 KB) | Perhelion(留言 | 贡献) | color + opt | |
2011年10月22日 (六) 10:46 | ![]() | 765 × 519(11 KB) | Perhelion(留言 | 贡献) | == {{int:filedesc}} == {{Information |Description=Amino Acid Chirality chirality with hands from http://www.nai.arc.nasa.gov/ A "chiral" molecule is one that is not superimposable with its mirror image. Like left and right hands that have a thumb, finger |
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