| A review of conditions affecting the radiolysis due to 40K on nucleic acid bases and their derivatives adsorbed on clay minerals: implications in prebiotic chemistry. | |
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MedLine Citation:
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PMID: 11536747 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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This paper describes the possible effects of ionizing radiation arising from long-lived soluble radionuclides within clays, in particular 40K, at the epoch of the emergence of life on Earth. The free dispersion of soluble radionuclides constitutes an effective in situ irradiation mechanism that might have acted upon adsorbed nucleic bases and their derivatives on clays, inducing chemical changes on these organic molecules. Several types of well documented reactions for radiolysis of nucleic acid bases and their derivatives are known, even at low doses (i.e., 0.1 Gy). For example, estimates with a dose rate calculated from 40K from deep sea clays at 3.8 Ga ago, indicates that over a period of 1000 years the amount of organic material transformated is 1.8 X 10(-7) moles/kg-clay. Although ionizing radiation may also induce synthetic reactions with prebiological interest, all in all these considerations indicate that nucleic acid bases and their derivatives adsorbed on clays were exposed for long periods to degradation conditions. Such situation promotes decomposition of organic molecules rather than protection of them and enhancement of farther polymerization, as it has been usually taken for granted. |
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Authors:
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F G Mosqueira; G Albarran; A Negron-Mendoza |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Review |
Journal Detail:
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Title: Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life Volume: 26 ISSN: 0169-6149 ISO Abbreviation: Orig Life Evol Biosph Publication Date: 1996 Feb |
Date Detail:
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Created Date: 1998-10-09 Completed Date: 1998-10-09 Revised Date: 2007-08-01 |
Medline Journal Info:
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Nlm Unique ID: 8610391 Medline TA: Orig Life Evol Biosph Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 75-94 Citation Subset: S |
Affiliation:
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Centro Universitario de Communicacion de la Ciencia, UNAM, Ciudad Universitaria, Mexico, D.F. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption Aluminum Silicates / chemistry* Bentonite Cations Earth (Planet) Evolution, Chemical* Gamma Rays* Hydrogen-Ion Concentration Nucleic Acids / chemistry, radiation effects* Polynucleotides / chemistry Potassium Radioisotopes* Purines / chemistry, radiation effects Pyrimidines / chemistry, radiation effects Radiation Dosage Radiochemistry Thorium Uranium |
| Chemical | |
Reg. No./Substance:
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0/Aluminum Silicates; 0/Cations; 0/Nucleic Acids; 0/Polynucleotides; 0/Potassium Radioisotopes; 0/Purines; 0/Pyrimidines; 1302-78-9/Bentonite; 1302-87-0/clay; 7440-29-1/Thorium; 7440-61-1/Uranium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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