𝔖 Bobbio Scriptorium
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Membrane activity and its correlation with vacuolar contraction in the heliozoanEchinosphaerium

✍ Scribed by Nishi, Takako ;Kobayashi, Makoto ;Shigenaka, Yoshinobu

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
570 KB
Volume
239
Category
Article
ISSN
0022-104X

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✦ Synopsis

Membrane potentials were recorded from two species of Heliozoa, Echinosphaerium akamae and E. nucleofilum. The resting potential ranged from -20 to -50 mV with a n average value of -33.7 f 12.9 mV ( SD, n = 10) and -31.6 & 9.5 mV (k SD, n = 10) in E. akamae and E. nucleofilum, respectively. Action potentials were elicited spontaneously or in response to applied current. They were abolished in Ca2+-deficient solution with no effect by Na+ or M2', indicating Ca-spikes. Membrane hyperpolarization, which correlated with the contraction of contractile vacuole (H-CV), was recorded. The onset of hyperpolarization appeared to be simultaneous with the initiation of contraction. The amplitude of H-CV was dependent on K f -concentration in

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