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Natural Radioactivity and Chemical Evolution on the Early Earth: Prebiotic Chemistry and Oxygenationстатья
- Автор: Ershov Boris
- Журнал: Molecules
- Том: 27
- Номер: 23
- Год издания: 2022
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- Первая страница: 8584
- DOI: 10.3390/molecules27238584
- Аннотация: It is generally recognized that the evolution of the early Earth was affected by an externalenergy source: radiation from the early Sun. The hypothesis about the important role of naturalradioactivity, as a source of internal energy in the evolution of the early Earth, is considered andsubstantiated in this work. The decay of the long-lived isotopes 232Th, 238U, 235U, and 40K in theGlobal Ocean initiated the oxygenation of the hydro- and atmosphere, and the abiogenesis. Thecontent of isotopes in the ocean and the kinetics of their decay, the values of the absorbed dose anddose rate, and the efficiency of sea water radiolysis, as a function of time, were calculated. The oceanserved as both a “reservoir” that collected components of the early atmosphere and products of theirtransformations, and a “converter” in which further chemical reactions of these compounds tookplace. Radical mechanisms were proposed for the formation of simple amino acids, sugars, andnitrogen bases, i.e., the key structures of all living things, and also for the formation of oxygen. Thecalculation results confirm the possible important role of natural radioactivity in the evolution ofterrestrial matter, and the emergence of life.
- Добавил в систему: Ершов Борис Григорьевич