Super-high Frequency Electric Field and Crustacean Ganglionic Discharges

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  • Yamaura Itsuo
    Microwave Technology Laboratory Department of Electrical Communications, Faculty of Engineering, and Department of Physiology School of Medicine, Tohoku University The Research Institute of Applied Electricity, Hokkaido University
  • Chichibu Shiko
    Microwave Technology Laboratory Department of Electrical Communications, Faculty of Engineering, and Department of Physiology School of Medicine, Tohoku University Department of Physiology, Tohoku University School of Dentistry

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Abstract

1. Super-high frequency electric field (100μW/mm3;11Gc) was applied to the abdominal ganglia of crayfish and prawn.<br> 2. Changes of the spontaneous discharge frequencies were used as an index of response, and they were divided into two phases.<br> 3. During the irradiation, the discharge frequency decreased. This was called suppressed phase.<br> 4. After termination of the irradiation, the discharge frequency increased up to 40% over the control value. This was designated as supernormal phase.<br> 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.<br> 6. Repeated irradiation produced an accumulative effect.<br> 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.

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