The Origins of Life on the Earth |
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Page 54
... energy , organic compounds can be synthesized in a reducing atmosphere . The absorption of energy in the atmosphere leads to the synthesis of reactive intermediates , which then- combine to form more complex organic compounds . A number ...
... energy , organic compounds can be synthesized in a reducing atmosphere . The absorption of energy in the atmosphere leads to the synthesis of reactive intermediates , which then- combine to form more complex organic compounds . A number ...
Page 55
... energy available for organic synthesis on the primitive earth are sunlight , electric discharges , thermal energy of volcanoes , cosmic Table 5-1 . Present Sources of Energy Averaged Over the Earth " Source Total radiation from sun ...
... energy available for organic synthesis on the primitive earth are sunlight , electric discharges , thermal energy of volcanoes , cosmic Table 5-1 . Present Sources of Energy Averaged Over the Earth " Source Total radiation from sun ...
Page 57
... energy is not effective in synthesizing organic compounds . Thermal energy can be used to synthesize organic compounds only if the constituents of the atmosphere are heated to 600 ° C or higher , and the products are then quenched ...
... energy is not effective in synthesizing organic compounds . Thermal energy can be used to synthesize organic compounds only if the constituents of the atmosphere are heated to 600 ° C or higher , and the products are then quenched ...
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