extremely significantp < 0.0001
All the factors including glucose, peptone, and H 2 O 2 exhibited a clear quadratic effect, which was in good agreement with the extremely significant effects ( p < 0.0001) of quadratic terms as shown in Table 2 .
All the factors including glucose, peptone, and H 2 O 2 exhibited a clear quadratic effect, which was in good agreement with the extremely significant effects ( p < 0.0001) of quadratic terms as shown in Table 2 .
According to the p- values, the interaction effects between any two variables among glucose, peptone and H 2 O 2 were not significant ( p > 0.05), while the linear effects of glucose and H 2 O 2 were significant ( p < 0.05) and the linear effect of peptone was highly significant ( p < 0.01).