Primordial Earth's Environment Suggested from Equilibrium Conditions among Proteinic Amino Acids

Details Primordial Earth's Environment Suggested from Equilibrium Conditions among Proteinic Amino Acids Primordial Earth's Environment Suggested from Equilibrium Conditions among Proteinic Amino Acids

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1318y&link_type=abstract

American Astronomical Society, DPS meeting #38, #13.18; Bulletin of the American Astronomical Society, Vol. 38, p.1295

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Amino acids are one of the essential substances for terrestrial lives. There are, as is well known, two interesting and important properties on amino acids in terrestrial lives: one is that infinite kinds of amino acids can be synthesized formally but, marvelously, only about 20 amino acids of these are utilized by proteinic materials of a wide variety of terrestrial lives. Another is that the relative molar ratios among the 20 amino acids are almost equal, at least, by the order of magnitude. In our present paper, paying attention to these facts, we will make an attempt to specify physical and chemical environments of the primordial Earth where first vital organic compounds begin to be synthesized. By assuming that two amino acids and appropriate inorganic compounds (CO2, NH3, CH4, etc.) are in chemical equilibrium under the condition of heated water, we can find the activity ratios (or activities) of inorganic compounds. Our results suggest that the heated water must be in a reducing condition and that the oxidizing compounds like O2 or SO2 cannot contribute to the equilibrium reactions.

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