The Origins of Life on the Earth |
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Page 59
... electric discharges on CH4 and NH3 , and a brown - black polymer is produced from cyanide solutions ( Chapter 7 ) . These and other organic materials absorb strongly in the ultraviolet . If such material were produced on the primitive ...
... electric discharges on CH4 and NH3 , and a brown - black polymer is produced from cyanide solutions ( Chapter 7 ) . These and other organic materials absorb strongly in the ultraviolet . If such material were produced on the primitive ...
Page 99
... electric discharge on a mixture of CH4 , NH3 , and H2O gives excellent yields of formaldehyde and small yields of pyrrole . Very small yields of porphyrins have been claimed from such electric discharge reactions . It seems likely that ...
... electric discharge on a mixture of CH4 , NH3 , and H2O gives excellent yields of formaldehyde and small yields of pyrrole . Very small yields of porphyrins have been claimed from such electric discharge reactions . It seems likely that ...
Page 100
... electric discharge has the merit of simplicity , but the yields are small and a mixture of isomeric cyanopyridines is obtained . The synthesis from propiolaldehyde gives better yields of nicotinonitrile without the other isomers ...
... electric discharge has the merit of simplicity , but the yields are small and a mixture of isomeric cyanopyridines is obtained . The synthesis from propiolaldehyde gives better yields of nicotinonitrile without the other isomers ...
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