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Fig. 5 | BMC Microbiology

Fig. 5

From: Enhancement of feather degrading keratinase of Streptomyces swerraensis KN23, applying mutagenesis and statistical optimization to improve keratinase activity

Fig. 5

Contour plots of keratinase activity as a function of the interactions of four variables by keeping the other at centre level. a incubation time, pH (b) sucrose%, pH (c) yeast extract %, pH (d) sucrose %, incubation time (e), yeast extract %, incubation time, and (f) yeast extract % and sucrose % on keratinase production by mutant S.A-27

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