The Origins of Life on the Earth |
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Page 192
... meteorite . ( b ) The three classes of meteorites . On the left is an iron meteorite that has been cut in two , polished , and then etched to show the pattern of crystals of iron - nickel alloy . In the center is a stony meteorite with ...
... meteorite . ( b ) The three classes of meteorites . On the left is an iron meteorite that has been cut in two , polished , and then etched to show the pattern of crystals of iron - nickel alloy . In the center is a stony meteorite with ...
Page 193
... meteorite produces a great deal of heat and light . The surface of the meteorite is frequently melted , forming a fusion crust , but the interior of the ... Meteorite Type Meteorites , Comets , Interstellar Molecules , Other Planets 193.
... meteorite produces a great deal of heat and light . The surface of the meteorite is frequently melted , forming a fusion crust , but the interior of the ... Meteorite Type Meteorites , Comets , Interstellar Molecules , Other Planets 193.
Page 217
... Meteorite , " Nature 228 , 923 ( 1970 ) . K. A. Kvenvolden , J. G. Lawless , and C. Ponnamperuma , " Nonprotein amino acids in the Murchison Meteorite , " Proc . Nat . Acad . Sci . U.S. 68 , 486 ( 1971 ) . C. E. Folsome , J. Lawless , M ...
... Meteorite , " Nature 228 , 923 ( 1970 ) . K. A. Kvenvolden , J. G. Lawless , and C. Ponnamperuma , " Nonprotein amino acids in the Murchison Meteorite , " Proc . Nat . Acad . Sci . U.S. 68 , 486 ( 1971 ) . C. E. Folsome , J. Lawless , M ...
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