HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Machemer, H Articles by Ogura, A Search for Related Content PubMed PubMed Citation Articles by Machemer, H Articles by Ogura, A

1. Paramecium caudatum was deciliated with ethanol. The ionic conductance of the membrane was investigated with constant current, voltage clamp and mechanical stimuli. 2. The resting potential was not modified by the removal of the cilia. The dependence of the resting potential on the extracellular concentrations of Ca and K was the same in deciliated and control cells. 3. The input resistance in deciliated and ciliated cells increased after the ethanol treatment. 4. The membrane capacitance decreased to 48% after deciliation, suggesting that the ciliary surface area is equal to the somatic surface area. 5. Deciliation completely removed the regenerative response (graded action potential) elicited by depolarizing current pulses or mechanical stimuli. 6. Deciliated cells retained the depolarizing and hyperpolarizing mechanoreceptor responses. 7. Voltage-clamp experiments demonstrated the loss of the early inward current in deciliated cells; it was restored during ciliary regeneration. Steady-state current-voltage relationships were unchanged by deciliation. 8. The time courses of the recovery of the membrane capacitance and of the early inward current were similar, suggesting that the number of voltage-sensitive Ca channels is proportional to the ciliary membrane area. 9. We conclude that the voltage-sensitive Ca channels reside in the ciliary membrane (in confirmation of Dunlap, 1976; Ogura & Takahashi, 1976), while mechanoreceptor channels, rectifier channels and resting conductances are localized in the somatic membrane.