Electrophysiology and Photomovement of Stentor
As first reported by Jennings (1906) and Mast (1906) Stentor coeruleus swims away from light sources (photodispersal) and collects in the more shaded areas of an unevenly illuminated container. Stentor are sensitive to light because they contain a pigment called stentorin (Møller, 1962; Walker et al., 1979), which releases H+ ions as a result of light absorption (Walker et al., 1981). This rapid proton release is thought to be an initial step in a series of steps which eventuate in photodispersal (Song et al., 1983). This paper summarizes the available evidence describing some of these intervening processes and the physiological mechanisms producing them.
KeywordsReceptor Potential Ciliary Membrane Intracellular Potential Ciliary Beating Paramecium Caudatum
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