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EFFECTS OF SOLAR RADIATION ON MOTILITY IN: Stentor coeruleus

The effects of solar radiation on the motility of the colored ciliate, Stentor coeruleus, have been assessed as a photodynamic model system for hypericism. The organism has been found to be extremely sensitive to solar radiation–a few minutes of unfiltered radiation suffice to arrest motility and decrease the velocity of movement. Removing UV‐B and UV‐A radiation prolongs the tolerated exposure times. From the present study, the mechanisms of the photodynamic action in S. coeruleus and in hypericin‐sensitized reactions have not been resolved in terms of Type I and II mechanisms.