Parity-Violating Energy Shifts of Murchison L-Amino Acids are Consistent with an Electroweak Origin of Meteorite L-Enantiomeric Excesses
| Autor: | R. Nakatsuka, G. O. Hyde, T. Fu, A. J. MacDermott, A. P. Coleman |
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| Rok vydání: | 2009 |
| Předmět: |
Models
Molecular Murchison meteorite chemistry.chemical_classification Electroweak interaction Stereoisomerism General Medicine Parent body Amino acid Crystallography Meteorite chemistry Deuterium Space and Planetary Science Thermodynamics Amino Acids Enantiomer Ecology Evolution Behavior and Systematics |
| Zdroj: | Origins of Life and Evolution of Biospheres. 39:459-478 |
| ISSN: | 1573-0875 0169-6149 |
| DOI: | 10.1007/s11084-009-9162-9 |
| Popis: | In 1996, four alpha-methyl amino acids in the Murchison meteorite--L-isovaline, L-alpha-methylnorvaline, L-alpha-methyl-allo-isoleucine and L-alpha-methyl-isoleucine--were found to show significant enantiomeric excesses of the L form, ranging from 2% to 9%. Their deuterium to hydrogen isotope ratios suggest they formed in the pre-solar interstellar gas cloud rather than during a later aqueous processing phase on the asteroid parent body. In this paper we apply the techniques of the preceding two papers to compute the parity-violating energy shifts of these amino acids. We find that, in the gas phase, the PVESs of the neutral L forms of all four Murchison alpha-methyl amino acids are decisively negative, and there is even some correlation between the magnitudes of the L-excesses and the magnitudes of the PVESs--all of which is at least consistent with an electroweak origin of the Murchison enantiomeric excesses. |
| Databáze: | OpenAIRE |
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