Fig. 5From: Improved production of Bacillus subtilis cholesterol oxidase by optimization of process parameters using response surface methodologySurface and contour plots showing the relationships between B. subtilis cholesterol oxidase activity (U/OD600) versus A volume of the fermentation medium (ml/flask) and initial pH, B cholesterol (g/l) and initial pH, and C cholesterol (g/l) and volume of the fermentation medium (ml/flask)Back to article page