The Origins of Life on the Earth |
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Page 139
... cyanamide could have formed in very large amounts . The only plausible route to cyanoguanidine is the dimerization of cyanamide , a reaction that goes readily in mildly alkaline solutions . N H2N − C = N + ̄HN¬C⇒N → H2N - C─NH - C ...
... cyanamide could have formed in very large amounts . The only plausible route to cyanoguanidine is the dimerization of cyanamide , a reaction that goes readily in mildly alkaline solutions . N H2N − C = N + ̄HN¬C⇒N → H2N - C─NH - C ...
Page 148
... Cyanamide : a possible key compound in chemical evolution , " Proc . Nat . Acad . Sci . U.S. 52 , 27 ( 1964 ) . R ... cyanamide , " Science 173 , 444 ( 1971 ) . Cyanamide dimer and dicyanamide G. D. Steinman , D. H. Kenyon , and M ...
... Cyanamide : a possible key compound in chemical evolution , " Proc . Nat . Acad . Sci . U.S. 52 , 27 ( 1964 ) . R ... cyanamide , " Science 173 , 444 ( 1971 ) . Cyanamide dimer and dicyanamide G. D. Steinman , D. H. Kenyon , and M ...
Page 222
... Cyanamide and a number of related compounds bring about the condensation of nucleosides and in- organic phosphate in aqueous solution to give a mixture of isomeric nucleo- tides . All of these reactions are inefficient , even in ...
... Cyanamide and a number of related compounds bring about the condensation of nucleosides and in- organic phosphate in aqueous solution to give a mixture of isomeric nucleo- tides . All of these reactions are inefficient , even in ...
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