Effect of low-dose ionizing radiation on luminous marine bacteria: radiation hormesis and toxicity


Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1016/j.jenvrad.2015.01.012

Ключевые слова: Marine bacteria, Low-dose effects, Radiation hormesis, Radiotoxicity, Reactive oxygen species, DRIFT, FMN, H-3, HTO, NADH, ROS, Americium, Biological radiation effects, Bioluminescence, Ionizing radiation, Microbiology, Microorganisms, Oxygen, Physiological models, Physiology, Radiation, Radiation effects, Radioactivity, Toxicity, Tritium, Low dose effects, Marine bacterium, Bacteria, americium 241, radioisotope, reactive oxygen metabolite, uranium 235, sea water, uranium, water pollutant, adaptation, bacterium, dose-response relationship, ecotoxicology, homeostasis, irradiation, marine environment, radioactive pollution, radionuclide, ecotoxicity, environmental monitoring, hormesis, low energy radiation, luminous marine bacterium, molecular dynamics, nonhuman, radiation exposure, radiation injury, radioactive contamination, Review, metabolism, radiation response, Bacteria (microorganisms), Dose-Response Relationship, Radiation, Seawater, Water Pollutants, Radioactive

Аннотация: 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 Показать полностьюa 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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Выпуск журнала: Vol. 142

Номера страниц: 68-77

ISSN журнала: 0265931X

Место издания: OXFORD



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