Photoreception and Photomovements in Stentor coeruleus
The step-up photophobic and negative phototactic responses of Stentor coeruleus to visible wavelength light represent two clear examples of the photosensitivity of aneural motile organisms. The former is a stop/reversal response exhibited by the organism as it crosses from the dark (lower light intensity) to the light side (higher light intensity). Figure 1 shows a videomicroscopic recording of the step-up photophobic response exhibited by two stentor cells.
KeywordsCiliate Cell Pigment Granule Proton Dissociation Ciliary Beating Phototactic Response
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