Fig. 3From: Effective biodegradation of chicken feather waste by co-cultivation of keratinase producing strainsBiodegradation of chicken feather waste in a scale-up 3 L fermenter by cocultivation. a, c Feather degradation results of cocultivation. b Changes in cell density, glucose concentration, and pH in the reaction system. d Keratinase activity and protease activity in the process of hydrolysisBack to article page