Fig. 5

3D response surface representing ACP activity yield (U L⁻¹ min⁻.¹) from B. sonorensis strain ACP2 as affected by culture conditions: a Interaction between MgSO₄.7H₂O and glucose, b Interaction between CrCl₃.6H₂O and glucose, c Interaction between NaH₂PO₄ and glucose, d Interaction between NaH₂PO₄ and MgSO₄.7H₂O, e Interaction between CrCl₃.6H₂O and MgSO₄.7H₂O, and f Interaction between CrCl₃.6H₂O and NaH₂PO₄