NONRACEMIC ISOVALINE IN THE MURCHISON METEORITE: CHIRAL DISTRIBUTION AND MINERAL ASSOCIATION
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dc.contributor.author | Pizzarello S. | |
dc.contributor.author | Zolensky M. | |
dc.contributor.author | Turk K.A. | |
dc.date.accessioned | 2021-12-24T05:12:37Z | |
dc.date.available | 2021-12-24T05:12:37Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1469679 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 8, 1589-1595 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33786 | |
dc.description.abstract | The enantiomeric and carbon-isotopic composition of the amino acid isovaline have been analyzed in several samples of the Murchison meteorite and one sample of the Murray meteorite. l-Enantiomeric excesses of the amino acid were found to range from 0 to 15.2%, varying significantly both between meteorite stones and at short distances within a single stone. The upper limit of this range is the largest enantiomeric excess measured to date for a biologically rare meteoritic amino acid and raises doubts that circularly polarized light irradiation could have been the sole cause of amino acids chiral asymmetry in meteorites. Individual d- and l-isovaline δ13C values ware found to be about +18%%, with no significant differences between the two enantiomers to suggest terrestrial contamination. The amino acid relative abundance also varied between samples, with isovaline/alanine ratios of 0.5 to 6.5. X-ray diffraction analyses of contiguous meteorite fragments suggest a possible correlation between isovaline and hydrous silicates abundances. | |
dc.title | NONRACEMIC ISOVALINE IN THE MURCHISON METEORITE: CHIRAL DISTRIBUTION AND MINERAL ASSOCIATION | |
dc.type | Статья |
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