The Origins of Life on the Earth |
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Page 123
... half - life less than 20,000 years under reasonable prebiotic conditions ) . This is a real difficulty if it is ... lives are : Compound Half - Life at 0 ° C ( yr ) Half - Life at 25 ° C ( yr ) Uridine 1.6 × 106 1.2 × 105 5 - Methyl ...
... half - life less than 20,000 years under reasonable prebiotic conditions ) . This is a real difficulty if it is ... lives are : Compound Half - Life at 0 ° C ( yr ) Half - Life at 25 ° C ( yr ) Uridine 1.6 × 106 1.2 × 105 5 - Methyl ...
Page 125
... Half - lives for the depurination of the single - stranded DNA virus X174 and half - lives for the hydrolysis of phosphodiester bonds of the single - stranded RNA virus R17 at 70 ° C . The data are based on rates of inactivation of ...
... Half - lives for the depurination of the single - stranded DNA virus X174 and half - lives for the hydrolysis of phosphodiester bonds of the single - stranded RNA virus R17 at 70 ° C . The data are based on rates of inactivation of ...
Page 126
... half - lives for each purine deoxynucleoside residue and each phosphodiester bond . Extrapolation of these data gives half - lives at pH 7.15 of Residue Depurination of DNA Hydrolysis of phosphodiester bonds of RNA Half - Life at 0 ° C ( yr ) ...
... half - lives for each purine deoxynucleoside residue and each phosphodiester bond . Extrapolation of these data gives half - lives at pH 7.15 of Residue Depurination of DNA Hydrolysis of phosphodiester bonds of RNA Half - Life at 0 ° C ( yr ) ...
Contents
PREBIOTIC SYNTHESIS OF PURINES PYRIMIDINES | 8 |
THE COMPOSITION | 12 |
GEOLOGICAL EVIDENCE | 16 |
Copyright | |
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abundant active adenine alanine aldehydes amino acids ammonia ammonium amounts anticodon aqueous solution aspartic acid biochemical biological CaCO3 carbon CH₂ chain chemical chert CO₂ concentration condensation contain COOH cyanoacetylene cytosine decomposition dust cloud electric discharge energy enzyme equilibrium escape layer evolution example formaldehyde formation formed gases genetic geological glutamic acid glycine H₂ H₂N H₂O hydrocarbons hydrogen cyanide hydrolysis hydrolyzed important inorganic L. E. Orgel limestone living organisms material mechanism membranes metabolism meteorites methane minerals mixture molecules N₂ NH₂ nitrogen nucleic acids nucleotides O₂ obtained occur organic compounds origin oxidation oxygen pathways peptide phosphate phosphorylation photochemical photosynthesis planets polymers polynucleotides polypeptides prebiotic prebiotic synthesis Precambrian present pressure primitive atmosphere primitive earth primitive ocean purines reaction replication rocks Schopf Science sequence solar system structure sugars surface t-RNA temperature ultraviolet light volcanoes yield