Abstract
Suspensions of Stentor coeruleus were illuminated with a white light (tungsten) source after prior adaptation to cool-white fluorescent light. The cells, with such overall illumination, exhibited a marked step-up response characterized by periodic interruptions of the forward left spiral swimming motion pattern. The interrupted motion type was persistent and the result of a light-dependent reversal of the membranellar ciliary system of the cell. The overall frequency of responses and the duration of the responses increased (from threshold effects at 14 W/m2) as a function of fluence rate (tested up to 158 W/m2; 300–1100 nm). The response frequency changed from 5 to 8 responses/s, while the overall response duration increased from 0.81 to 2.9 s. Key words: Stentor coeruleus, photosensory response, ciliate.
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