Combined effects of extremely low frequency electromagnetic fields (ELFMFs) and X-rays or H/sub 2/O/sub 2/ on mutation in pTN89 plasmids

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We detected mutations that occurred in the supF gene carried by pTN89 plasmids in Escherichia coli (E. coli) to examine the effects of extremely low frequency electromagnetic fields (ELFMF) and X-rays or H/sub 2/O/sub 2/ on the plasmids. This E. coli system was developed by Obata et al. (1998) and can detect a mutation at the single base level in the supF gene. In experiments, the plasmids were subjected to sham exposure or exposed to an ELFMF (60 Hz, 5 mT (millitesla)), with or without X-ray irradiation (10 Gy). For the combined treatments, exposure to the ELFMF was done immediately before or after X-ray irradiation. Increased mutation frequency was not detected following exposure to a magnetic field alone, or after sham exposure. The mutation frequency for X-rays followed by an ELFMF was statistically significant compared to the other treatments.

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