Cytogenetic Observations on Thymidine Synchronized Bovine Lymphocytes Exposed to 7.25 GHz Microwaves

Thymidine synchronized bovine lymphocytes were exposed in the S phase to 7.25 GHz microwaves by means of a waveguide system. The exposures were 1 hour long and the temperature rise was less than 1°C. No specific effect of microwaves was evidenced, but chromosome breaks occurred following either microwave or conventional heating. Thymidine alone was found to induce polyploidy and the 1°C heating seems to reduce this effect.