Breakdown phenomena in the Chara membrane |
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Authors: | Ohkawa, Taka-aki Kishimoto, Uichiro |
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Affiliation: | Department of Biology, Faculty of General Education, Osaka University Toyonaka, Osaka, Japan |
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Abstract: | The breakdown phenomenon in the Chara internodal cell was studiedusing the voltage clamp technique. When a slowly hyperpolarizingramp potential pulse was applied to the Chara membrane, thebreakdown occurred with hyperpolarization of about 220 mV. Thebreakdown was observed by less hyperpolarization, if the externalK+ concentration was increased. Such a breakdown phenomenonin the Chara membrane was caused principally by a large shiftof the membrane electromotive force toward depolarization. Thisshift frequently exceeded the peak level of the action potential. (Received July 26, 1976; ) |
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