The Origins of Life on the Earth |
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Page 113
... nucleosides amongst the complex mixture of products formed in typical prebiotic reactions . Direct heating of ribose with bases , either in the dry state or in aqueous solution , leads to little or no nucleoside synthesis . However ...
... nucleosides amongst the complex mixture of products formed in typical prebiotic reactions . Direct heating of ribose with bases , either in the dry state or in aqueous solution , leads to little or no nucleoside synthesis . However ...
Page 117
... Nucleosides R. A. Sanchez and L. E. Orgel , " Synthesis and photoanomerization of pyrimidine nucleosides , " J. Mol . Biol . 47 , 531 ( 1970 ) . W. D. Fuller , R. A. Sanchez , and L. E. Orgel , " Synthesis of purine nucleosides , " J ...
... Nucleosides R. A. Sanchez and L. E. Orgel , " Synthesis and photoanomerization of pyrimidine nucleosides , " J. Mol . Biol . 47 , 531 ( 1970 ) . W. D. Fuller , R. A. Sanchez , and L. E. Orgel , " Synthesis of purine nucleosides , " J ...
Page 123
... nucleosides occurred in the primitive ocean we could neglect any problems arising from the instability of the free sugars . However , at present , no completely satisfactory prebiotic synthesis of nucleosides has been described ...
... nucleosides occurred in the primitive ocean we could neglect any problems arising from the instability of the free sugars . However , at present , no completely satisfactory prebiotic synthesis of nucleosides has been described ...
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