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Pareto diagram showing the effects of five different organic nitrogen sources on extracellular protease production by R. mucilaginosa CBMAI 1528. Glucose at concentration of 20 g/L was used as a carbon source in runs carried out at 20 °C in flasks shaken at 250 rpm for 48 h. X1: Casein tryptone (g/L), X2: Peptone from animal tissue (g/L), X3: Yeast extract (g/L), X4: Casamino acids (g/L), X5: Peptone from gelatin (g/L).
