The Dielectric Behaviors of Cells under Nonuniform AC Fields

Study on the dielectric phenomena of cells is an important part of the bio-effects of electromagnetic fields. Using one kind of mushroom spore to be sample, the movement of spores under non-uniform ac fields was investigated by means of a micro-electrode system. It was found that there was an optimized frequency in the range of 10 kHz to 10MHz. At the optimized frequency point, it would take the shortest time for spores to turn round, move toward the direction of applied field and at last form clusters, which shows that the electric force on spores is the maximum. Meanwhile, this optimized frequency point depends on the applied voltage wave. The square-wave has better effect on forming clusters than sine-wave. Those could be explained by the spore´s polarization basis of a dielectric model in electric fields