Fig. 2From: Optimization of lipids’ ultrasonic extraction and production from Chlorella sp. using response-surface methodology2D and 3D representations of lipids contents in function of (a): [NaNO3] and [NaCl] (at Light intensity = 163.6 μmol · m− 2 · s− 1); (b): [NaNO3] and light intensity (at [NaCl] = 24); and (c): light intensity and [NaCl] (at [NaNO3] = 1 mL · L− 1)Back to article page