The Origins of Life on the Earth |
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Page 149
... poly- saccharides , nucleosides and nucleic acids and the origin of self - reproducing systems , " Angew , Chem . Int . Ed . 1 , 1 ( 1962 ) . These syntheses use ethyl metaphos- phate , a reagent prepared from phosphorus pentoxide ...
... poly- saccharides , nucleosides and nucleic acids and the origin of self - reproducing systems , " Angew , Chem . Int . Ed . 1 , 1 ( 1962 ) . These syntheses use ethyl metaphos- phate , a reagent prepared from phosphorus pentoxide ...
Page 158
... poly C. ( Redrawn from Biochem . Biophys . Res . Comm . 17 , 93 , 1964. ) At temperatures below the melting point of the poly U + poly U + pA triple helix ( that is , when the bases are stacked ) , polyuridylic acid greatly increases ...
... poly C. ( Redrawn from Biochem . Biophys . Res . Comm . 17 , 93 , 1964. ) At temperatures below the melting point of the poly U + poly U + pA triple helix ( that is , when the bases are stacked ) , polyuridylic acid greatly increases ...
Page 159
... poly U in the presence of Mg * no condensation occurs ; the ATP slowly hydrolyzes to ADP and then to AMP . The imidazolides of the nucleo- tides , on the other hand , are excellent reagents . Adenosine - 5 ' - phospho- imidazolide ...
... poly U in the presence of Mg * no condensation occurs ; the ATP slowly hydrolyzes to ADP and then to AMP . The imidazolides of the nucleo- tides , on the other hand , are excellent reagents . Adenosine - 5 ' - phospho- imidazolide ...
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