Fig. 4From: Isolation and identification of a feather degrading Bacillus tropicus strain Gxun-17 from marine environment and its enzyme characteristicsSummary of biochemical characteristics of keratinase: a pH optimum; b temperature optimum; c substrate specificity; d kinetics. Letters a, b, c, d and e indicate significance difference amongst the various treatments (P < 0.05)Back to article page