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A large number of media have been tested for cultivating Microthris parvicella, a filamentous microorganism often present in the activated sludge of oxidation ditches. The bacterium was found to utilize oleic acid (preferably as Tween 80) as the sole source of carbon and energy. Sulfur is required in the reduced form. The tested media vary from a complex to a chemically defined medium. Growth yields of 1.3 to 1.5 g/liter were obtained on media containing Tween 80 (4 g/liter), reduced nitrogen and reduced sulfur compounds, calcium and magnesium salts, phosphate buffer, trace elements, thiamin, and cyanocobalamin. The optimum temperature for growing the organism is approximately 25 degrees C, and the pH of the nutrient medium should be above 7.

Microthrix parvicella, a filamentous bacterium isolated from activated sludge: cultivation in a chemically defined medium