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Effect of pH on activity of proteases from gut bacteria in H. armigera. The midgut bacterial proteases were incubated with azocasein at different pH ranging from 2.0 to 12.0 and the total protease activity was measured. Total protease activity in (■) IVS1, (▲) IVS2, and (●) IVS3 isolates was determined. Each value represents the average of three experiments.
