期刊
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
卷 142, 期 -, 页码 68-77出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2015.01.012
关键词
Marine bacteria; Low-dose effects; Radiation hormesis; Radiotoxicity; Reactive oxygen species
资金
- Russian Foundation for Basic Research [13-04-01305a]
- Program Molecular and Cellular Biology of the Russian Academy of Sciences [VI 57.1.1]
- Russian Science Foundation [14-14-00076]
- Russian Science Foundation [14-14-00076] Funding Source: Russian Science Foundation
The paper summarizes studies of effects of alpha- and beta-emitting radionuclides (americium-241, uranium-235+238, and tritium) on marine microorganisms under conditions of chronic low-dose irradiation in aqueous media. Luminous marine bacteria were chosen as an example of these microorganisms; bioluminescent intensity was used as a tested physiological parameter. Non-linear dose-effect dependence was demonstrated. Three successive stages in the bioluminescent response to americium-241 and tritium were found: 1 - absence of effects (stress recognition), 2 - activation (adaptive response), and 3 - inhibition (suppression of physiological function, i.e. radiation toxicity). The effects were attributed to radiation hormesis phenomenon. Biological role of reactive oxygen species, secondary products of the radioactive decay, is discussed. The study suggests an approach to evaluation of non-toxic and toxic stages under conditions of chronic radioactive exposure. (C) 2015 Elsevier Ltd. All rights reserved.
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