Figure 2.

Effect of (a) pH (at 50°C) and (b) temperature (at pH 5.0) on xylanase activities of Nf Xyn11A (filled square) and Ta Xyn10A (filled triangle) and (c) their thermostabilities. Xylanase activity determinations were carried out by 5-minute incubation at different pH values and temperatures. The values of relative activities are the means of three replicates. Residual activity was measured after incubating the enzyme at 70°C (closed symbols) and 80°C (open symbols) in the absence of substrate.