ヨウ素と微生物の相互作用 : ヨウ素の揮発,濃縮,還元,酸化,吸着

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Iodine is an essential trace element for humans and animals because of its important role as a constituent of thyroid hormones. From a radioecological viewpoint, on the other hand, the anthropogenic iodine-129 (^<129>I, half-life: 1.6 x 10^7 years) is of great concern since it is one of the most persistent radionuclides released from nuclear facilities into the environment. Given its long half-life, ^<129>I can participate in the biogeochemical cycling of iodine and potentially accumulate in the human thyroid gland. Therefore, it is necessary to obtain better information on the behavior of iodine in the environment for accurate safety assessments of ^<129>I. Major pathways of the iodine cycling are volatilization of organic iodine compounds into the atmosphere, concentration of iodine to living organisms, reduction and oxidation of inorganic iodine species, and sorption of iodine on soils and sediments. Considerable geochemical evidences have indicated that these processes are influenced or controlled by biological activities, although detailed mechanisms are still unclear. In this review, I summarize interactions between iodine and organisms with special attention to newly isolated bacteria which could contribute significantly to the iodine cycling on a global scale.
千葉大学の論文