This paper showed the biological effect of a static magnetic field using the adhesion of pathogenic
Escherichia coli to HeLa cells. The number of adhesive
E. coli was increased by the exposure of the static magnetic field under the mixed incubation. There was also the dose dependency on the intensity of static magnetic field in this phenomenon. In order to analyze this phenomenon, the growth enhancement of
E. coli caused by the static magnetic field exposure and the changes of susceptibility in HeLa cells due to the static magnetic field exposure were examined respectively. However, those changes were not observed in both cases. The phenomenon might be caused in order that the static magnetic field suppressed the movement of
E. coli in a culture solution. Based on the speculation, viscosity was added to the culture solution of
E. coli to suppress the movement. The adhesive number of
E. coli to the HeLa cells increased under this condition. We also examined effects of ELF (10, 30, 50Hz) magnetic fields on the adhesion of
E. coli to HeLa cells. The decrease in the adhesive number of
E. coli was observed in the 10Hz magnetic field. In cases of 30Hz and 50Hz magnetic fields, however, the clear difference was not observed.
Escherichia coli have negative charges on the cell surface. Lolentz force may be given while they move in the static magnetic field. Therefore, we speculate that the Lolentz force induces the enhancement of adhering bacteria to HeLa cells.
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