The Origins of Life on the Earth |
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Page 108
... cyanoacetylene . It was found that cyanoacetylene reacts directly with aqueous cyanate to give cytosine in quite good yield ( 20 % ) , but that the more obvious reaction of cyanate with aminoacrylonitrile does not work . HCEC - CEN ...
... cyanoacetylene . It was found that cyanoacetylene reacts directly with aqueous cyanate to give cytosine in quite good yield ( 20 % ) , but that the more obvious reaction of cyanate with aminoacrylonitrile does not work . HCEC - CEN ...
Page 109
... cyanoacetylene , but it is unlikely to have prebiotic significance since the hydrolysis of cyanoacetylene gives cyanoacetaldehyde and little or no propiolamide . SUGARS Formaldehyde is one of the simplest organic molecules and is ...
... cyanoacetylene , but it is unlikely to have prebiotic significance since the hydrolysis of cyanoacetylene gives cyanoacetaldehyde and little or no propiolamide . SUGARS Formaldehyde is one of the simplest organic molecules and is ...
Page 114
... cyanoacetylene , a material very similar to cytidylic acid is obtained in up to 20 % yield . It is , in fact , almost entirely a - cytidylic acid rather than the natural ẞ isomer . The same material is obtained in excellent yield from ...
... cyanoacetylene , a material very similar to cytidylic acid is obtained in up to 20 % yield . It is , in fact , almost entirely a - cytidylic acid rather than the natural ẞ isomer . The same material is obtained in excellent yield from ...
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