抄録
1. Super-high frequency electric field (100μW/mm3;11Gc) was applied to the abdominal ganglia of crayfish and prawn.
2. Changes of the spontaneous discharge frequencies were used as an index of response, and they were divided into two phases.
3. During the irradiation, the discharge frequency decreased. This was called suppressed phase.
4. After termination of the irradiation, the discharge frequency increased up to 40% over the control value. This was designated as supernormal phase.
5. A fifty percent attenuation of the intensity of the applied electric field produced twice as much elongation of the time constant of the declining limb in the suppressed phase.
6. Repeated irradiation produced an accumulative effect.
7. Possible mechanisms of the microwave irradiation were discussed with relation to the thermal conversion of absorbed energy and the re-orientation effect of cell membrane structure.
