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metabolic cycles in the human organinsm, folic acid derivatives are involved in its enzyme systems. Moreover, the biosynthesis of methionine, purine and pyrimidine nucleotides, and DNA methylation takes place [1]. Homocysteine (Нс) is a sulphurcontaining amino acid which is a marker for the efficiency of FM functioning. Blood Hс levels have exceeded physiological limits in more than 75.0% of the adolescents living in Ivankivskyi and Poliskyi districts, Kyiv region, in 30 years after the accident at the Chornobyl nuclear power plant (ChNPP) [2]. Disorders in the production of thyroid hormones have also been registered [3]. Taking into account a high prevalence of thyroid cancer among the inhabitants of the Ukrainian-Belarusian Polissia after accident at the Chornobyl nuclear power plant [4], a determination of the FC state and its linkwith the thyroid system in children, constantly living under radiation risk due to the ChNPP accident, is of high priority. The forest fires at the territory contaminated with radionuclides may be one of the causes of radiation exposure. In total, 4.0 millions hectares of the forest lands were contaminated with radioactive elements in Ukraine. Zhytomyr region (974.3 thousands hectares), Kyiv region (416.4 thousands hectares), Chernihiv region (725.5 thousands hectares), and Rivne region (728.8 thousands hectares) are the most suffered regions [5]. The greatest amount of radioactive fall-out, in particular 137Cs – 4.4 PBq, 90Sr – 4.0 PBq, 239/240Pu – 32 TBq, fell within 30-km Chornobyl exclusion zone [6]. Thus, the soils of suffered areas, the forest trees, shrubs, and grasses, growing in these areas, currently contain a huge amount of radioactive elements. Forest fires, often occurring in the Chornobyl exclusion zone, are one of the most powerful sources of secondary air pollu1BANDAZHEVSKYI Yu.I., 2DUBOVA N.F.

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Bandazhevskyi Yu.I., Dubova N.F. The state of folate metabolism and its link with thyroid system in children after forest fires in the Chornobyl exclusion zone