508968.fig.002a
(a)
508968.fig.002b
(b)
508968.fig.002c
(c)
508968.fig.002d
(d)
Figure 2: Response surface showing the interaction between five parameters and extracellular invertase production (U/mL); (a) sucrose and NaNO3, (b) sucrose and Triton X-100, (c) yeast extract and Triton X-100, and (d) NaNO3 and Triton X-100. Other variables are constant at their center points. The numbers inside the contour plots indicate conversion yield (U/mL) of the extracellular invertase.