Fig. 4From: Rhamnolipid production by a gamma ray-induced Pseudomonas aeruginosa mutant under solid state fermentationThree dimensional (3D) surface plots for the effects of temperature, inoculum size and pH on RL production by P. aeruginosa 15GR using SSF (obtained from Design Expert software). a pH is fixed at 8, b Temperature is fixed at 30 °C, c Inoculum size is fixed at 1% v/vBack to article page