Explaining the Variations in Isotopic Ratios in Meteoritic Amino Acids
نویسندگان
چکیده
منابع مشابه
Racemization of Meteoritic Amino Acids
Meteorites may have contributed amino acids to the prebiotic Earth, affecting the global ratio of right-handed to left-handed (D/ L) molecules. We calculate D/ L ratios for seven biological, α-hydrogen, protein amino acids over a variety of plausible parent body thermal histories, based on meteorite evidence and asteroid modeling. We show that amino acids in meteorites do not necessarily underg...
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Implications for Exobiology. J. E. Elsila, A. S. Burton, J. C. Aponte, D. G. Blackmond, J. P. Dworkin, and D. P. Glavin, NASA Goddard Space Flight Center, Greenbelt, MD 20771, Astromaterials Research and Exploration Science Division, NASA Johnson Space Center, Mail Code XI3, Houston, TX 77058, Catholic University of America, Washington, DC 20064, Department of Chemistry, The Scripps Research In...
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The analysis of amino acids in meteorites dates back over 50 years; however, it is only in recent years that research has expanded beyond investigations of a narrow set of meteorite groups (exemplified by the Murchison meteorite) into meteorites of other types and classes. These new studies have shown a wide diversity in the abundance and distribution of amino acids across carbonaceous chondrit...
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The presence of nonprotein α-dialkyl-amino acids such as α-aminoisobutyric acid (α-AIB) and isovaline (Iva), which are considered to be relatively rare in the terrestrial biosphere, has long been used as an indication of the indigeneity of meteoritic amino acids. However, recent work showing the presence of α-AIB and Iva in peptides produced by a widespread group of filamentous fungi indicates ...
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The origin of complex organic molecules such as amino acids and their precursors found in meteorites and comets is unknown. Previous studies have accounted for the complex organic inventory of the Solar System by aqueous chemistry on warm meteoritic parent bodies, or by accretion of organics formed in the interstellar medium. This paper proposes a third possibility: that complex organics were c...
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ژورنال
عنوان ژورنال: Astrobiology
سال: 2020
ISSN: 1531-1074,1557-8070
DOI: 10.1089/ast.2019.2186