3D response surface representing acid phosphatase activity yield (U L −1 min −1) from B. haynesii strain ACP1 as affected by culture conditions, (a) interaction between (NH 4) 2 SO 4 and glucose, (b) interaction between rock phosphate and glucose, (c) interaction between NaCl and glucose, (d) interaction between rock phosphate and (NH 4) 2 SO 4, …Web