Fig. 3

Effects of medium components on keratinase production by B. cereus YQ15 with an initial pH of 7.2 after cultivation at 37 °C and 200 rpm for 36 h. a, Keratinous inducers (10 g/L); b, Feather; c, Carbon sources (10 g/L); d, Soluble starch; e, Nitrogen sources (2 g/L); f, Peptone; g, Mineral salts (2 g/L); h, MgSO₄