Definition: the action by which certain substances, notably fluorescing dyes (acridine, eosin, methylene blue, rose bengal) absorb visible light and emit the energy at wavelengths that are deleterious to microbes or other organisms in the dye-containing suspension, or selectively destroy cancer cells sensitized by intravenous porphyrin and exposed to red laser light.
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Examples: glitazone, GI cocktail, etc.