Figure 3. Response surface plot (A) and its contour plot (B) of proteolytic activity by peptidase immobilized in cross-linked chitosan beads showing interaction between bead diameter and beads/ enzyme ratio. Other variables were held at zero level

From

A Peptidase Enzyme from Bacillus cereus with Antimicrobial Properties: Optimizing the Immobilization in Chitosan Beads Using Box-Behnken Design

Catalina Kotlar, Sara Inés Roura, Alejandra Graciela Ponce

Journal of Polymer and Biopolymer Physics Chemistry. 2016, 4(1), 28-39 doi:10.12691/jpbpc-4-1-4