Mineral salts pyridone broth is a selective medium for bacteria that can metabolizepyridone[?] (which is an unusual carbon source that only a select few types of bacteria can use). This medium is used to isolate bacteria belonging to the Arthrobacter genus among other bacteria genera.
... and possibly bishop of Croton. In approximately 580, he wrote "De origine actibusque Getarum[?]" (The origin and deeds of the Goths), "De breviatione chronicorum" and ...