Fig. 1From: Improving the specific activity and pH stability of xylanase XynHBN188A by directed evolutionThe RBB-xylan substrate plate to screening the mutant library. The mutants in the library were spread on the RBB-xylan substrate plate method with IPTG induction for preliminary functional screening (a, b). The mutants with obvious bigger hydrolysis circle compared with the wide type were rescreened on the RBB-xylan substrate plate (c)Back to article page