The Origins of Life on the Earth |
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Page 46
... ultraviolet light . We are not convinced that an oil slick was as important as this proposal indicates , since polar groups ( e.g. , H2O and NH3 ) would be added to the hydrocarbons during the photochemical reactions in the atmosphere ...
... ultraviolet light . We are not convinced that an oil slick was as important as this proposal indicates , since polar groups ( e.g. , H2O and NH3 ) would be added to the hydrocarbons during the photochemical reactions in the atmosphere ...
Page 58
... ultraviolet light of wavelengths below about 3,000 Å does not reach the surface of the earth . Wavelengths below 2,200 Å are absorbed by O2 , and ozone absorbs the light between 2,200 and 3,200 Å . A reducing atmosphere would have been ...
... ultraviolet light of wavelengths below about 3,000 Å does not reach the surface of the earth . Wavelengths below 2,200 Å are absorbed by O2 , and ozone absorbs the light between 2,200 and 3,200 Å . A reducing atmosphere would have been ...
Page 59
... ultraviolet light . They would be ineffective in the synthesis of organic com- pounds in the atmosphere , but might have been important in the oceans , since many photochemical transformations in solution do not require large amounts of ...
... ultraviolet light . They would be ineffective in the synthesis of organic com- pounds in the atmosphere , but might have been important in the oceans , since many photochemical transformations in solution do not require large amounts of ...
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