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[Tissue specificity of changes in mitotic activity induced by strong magnetic fields].

The mitotic index, frequency of chromosomal aberrations, and the cell count in the bone marrow, corneal and intestinal epithelium of mice exposed for one hour to a magnetic field (MF) with a period of 30 sec and intensity of 2.9-127 kOe have been examined. The mitotic activity of the corneal epithelium was inhibited during the exposure, and began to recover immediately after its terminations. No inhibition of the mitotic activity of bone marrow was demonstrated immediately after the exposure. Later the mitotic index of bone marrow was seen first to diminish and then to recover, reaching the normal value at a far later stage than did the corneal epithelium. No essential changes of the mitotic activity of intestinal epithelium was demonstrated. The suppression of the mitotic activity per I kOe run independently on the intensity of MF in the bone marrow, being reduced in the corneal epithelium. Tissue cells of mice exposed to the above MF showed no generative changes. Variations in cell counts were small (not more than 20-25%) and readily reversible. The frequency of chromosomal aberrations in the tissues examined did not increase as a result of the exposure to the described MF.