[Sensitivity of mammalian tissues to prolonged exposure to high-tension permanent magnetic fields].

The retinal epithelium, bone marrow and spermatogenic epithelium of mice exposed for 30 days to constant magnetic fields of 1.6 T were examined cytologically. During and after exposure the retinal and bone marrow epithelium showed no biologically significant deviations from normal. The mitotic changes were of small amplitude and insufficient to cause cell unbalance. No chromosome aberrations or degenerative changes in the cells were seen. In the spermatogenic epithelium the exposure to a constant magnetic field produced a destruction of mature cell elements. Due to this the total amount of spermatogenic cells was significantly lower during and immediately after exposure.