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[The functional state of the mitochondrial respiratory chain of the small intestine enterocytes of the rats under the low dose rate X-ray total external exposure].

The influence of the low-rate ionizing radiation (0.055 Gy/min) at the doses of 0.1; 0.5 and 1.0 Gy on the functional state of the mitochondria respiratory chain of the rat small intestine enterocytes was investigated. The dysfunction of the electron transport chain enzymes andchanges in the content of cytochromes b, c, a in themitochondrial inner membrane were revealed 1, 12 and 24 hours after exposure to radiation. The re- vealed disorders indicate early membrane sensitivity to the radiation effect. The inhibition of the H+ -ATPase activity in the studied dose range indicates the decrease of the mitochondrial energy capacity.