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PHOTOPHOBIC BEHAVIORAL RESPONSES OF EUGLENA IN A LIGHT INTENSITY GRADIENT AND THE KINETICS OF PHOTORECEPTOR PIGMENT INTERCONVERSIONS *
Author(s) -
Creutz C.,
Colombetti G.,
Diehn B.
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb07653.x
Subject(s) - euglena gracilis , light intensity , euglena , intensity (physics) , biophysics , kinetics , population , pigment , chemistry , biology , optics , physics , biochemistry , demography , chloroplast , organic chemistry , quantum mechanics , sociology , gene
— Accumulation of Euglena gracilis in small illuminated regions called light traps is due to a phobic response to the diminished light intensity at the boundary of the region. The rate of such accumulation of cells was measured as functions of both the light intensity within the trap and the change of intensity at the boundary of the trap. The initial rate of accumulation of a population of cells was taken to be a direct measure of the phobic response of a single typical cell. The data indicate that the strength of the behavioral response in a single cell may be described as being proportional, to the rate of change of the amount of photochemically active form of a photoreceptor pigment molecule which can exist in two predominant forms.