title: Photodynamic action in Spirostomum ambiguum.
mesh_terms: D016798:Ciliophora / Q000187:drug effects / Q000502:physiology / Q000528:radiation effects*; D008027:Light; D008954:Models, Biological; D010100:Oxygen / Q000494:pharmacology; D010313:Partial Pressure; D011830:Radiation Effects; D013696:Temperature
chemical_list: D010100:Oxygen