Abstract
Abstract— When exposed, in the presence of molecular oxygen, to light intensities of the order of3–30 W m‐2, the ciliate Blepharisma japonicum changes its color from red to blue, because of the photooxidation of the photoreceptor pigment, blepharismin, to pxyblepharismin. Both red‐and blue‐pigmnentes cells show step‐up photophobic responses. The action spectra f the light‐dependent behaviour of the red and the blue form of Blepharisma have been determined; their structure is very similar to that the photosensing and phototransducing properties of blepharismin are maintained in its photooxidized form. oxyblepharismin.
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