The Origins of Life on the Earth |
From inside the book
Results 1-3 of 28
Page 11
... nitrogen , and oxygen that were retained , we must assume that they were held mainly in a chemically combined form : Nitrogen was held in ammonium silicates , other ammonium compounds , and perhaps nitrides ; carbon could have been ...
... nitrogen , and oxygen that were retained , we must assume that they were held mainly in a chemically combined form : Nitrogen was held in ammonium silicates , other ammonium compounds , and perhaps nitrides ; carbon could have been ...
Page 108
... nitrogen led to the identification of cyanoacetylene . In fact , it was the major nitrogen - containing compound after hydrogen cyanide . More recently it has become clear that cyanoacetylene is also produced from the reaction of nitrogen ...
... nitrogen led to the identification of cyanoacetylene . In fact , it was the major nitrogen - containing compound after hydrogen cyanide . More recently it has become clear that cyanoacetylene is also produced from the reaction of nitrogen ...
Page 183
... nitrogen - fixation are complicated ( and not worked out in any detail at the present time ) , this process may have ... nitrogen sources , as soon as the pathway for their reduction developed . A possible sequence for the development of ...
... nitrogen - fixation are complicated ( and not worked out in any detail at the present time ) , this process may have ... nitrogen sources , as soon as the pathway for their reduction developed . A possible sequence for the development of ...
Contents
PREBIOTIC SYNTHESIS OF PURINES PYRIMIDINES | 8 |
THE COMPOSITION | 12 |
GEOLOGICAL EVIDENCE | 16 |
Copyright | |
21 other sections not shown
Common terms and phrases
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