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The Present Oxidizing Atmosphere
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abundant adenine alanine aldehydes amino acids ammonia ammonium amounts aqueous solution aspartic acid biochemical biological carbon Chem chemical concentration condensation contain COOH cyanamide cyanate cyanoacetylene cyanogen cytosine decomposition electric discharge energy enzyme equilibrium evolution evolved example formaldehyde formation formed genetic geological glutamic acid glycine half-lives hydrogen cyanide hydrolysis hydrolyzed important inorganic isomers L. E. Orgel living organisms lysine mechanism membranes metabolism meteorite methane mixture molecules nitrogen nucleic acids nucleosides obtained occur OH OH OH optically active organic compounds origin oxidation oxygen pathways peptide phosphate phosphorylation photochemical photosynthesis planets poly polymerization polymers polynucleotides polypeptides possible prebiotic conditions prebiotic synthesis Precambrian present primitive atmosphere primitive earth primitive ocean purines pyrimidines reaction replication rocks S. L. Miller S. W. Fox Science sequence solar system stars structure sugars surface t-RNA temperature tetramer thermal ultraviolet light uridine yield