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Effects of reactive oxygen species (ROS) on cell growth and poly(γ‐glutamic acid) (γ‐PGA) synthesis were studied by adding hydrogen peroxide to a medium of Bacillus subtilis NX‐2. After optimizing the addition concentration and time of H2O2, a maximum concentration of 33.9 g/L γ‐PGA was obtained by adding 100 µM H2O2 to the medium after 24 H. This concentration was 20.6% higher than that of the control...
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