Comparison of chronic low-dose effects of alpha- and beta-emitting radionuclides on marine bacteria

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.2478/s11535-014-0331-0

Ключевые слова: Luminous bacteria, Am-241, Tritium, Hormesis, Radiotoxicity, Peroxides, Am-241, Hormesis, Luminous bacteria, Peroxides, Radiotoxicity, Tritium

Аннотация: Effects of Americium-241 (Am-241), alpha-emitting radionuclide of high specific radioactivity, and tritium (H-3), beta-emitting radionuclide, on luminous bacteria Photobacterium phosphoreum were compared. Bioluminescence intensity served as a marker of bacterial physiological activity. Three successive stages in the bioluminescence response to Am-241 and H-3 were found under conditions of lowdose irradiation: (1) absence of effects, (2) activation, and (3) inhibition. They were interpreted in terms of bacterial response to stressfactor as stress recognition, adaptive response/syndrome, and suppression of physiological function (i.e. radiation toxicity). Times of bioluminescence activation (TBA) and inhibition (TBI) were suggested as parameters to characterize hormesis and toxic stages in a course of chronic low-dose irradiation of the microorganisms. Values of TBA and TBI of Am-241 were shorter than those of H-3, revealing higher impact of alpha-irradiation (as compared to beta-irradiation) under comparable radiation doses. Increases of peroxide concentration and NADH oxidation rates in Am-241 aquatic solutions were demonstrated; these were not found in tritiated water. The results reveal a biological role of reactive oxygen species generated in water solutions as secondary products of the radioactive decay. The study provides a scientific basis for elaboration of bioluminescence-based assay to monitor radiotoxicity of alpha- and beta-emitting radionuclides in aquatic solutions.

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Выпуск журнала: Vol. 9, Is. 10

Номера страниц: 951-959

ISSN журнала: 1895104X

Место издания: WARSAW



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