Figure 1. Kinetics of β-xylosidase production by K. marxianus PPY125 and its mutant M125 in shake flask fermentation of two representative substrates namely:
(a) xylose, and
(b) cellobiose

Each 2% using yeast basal salt medium. The initial pH of the medium was 5.5, inoculum size 10%, and temperature 35ºC.

О = β-xylosidase activity IU per ml (open, parent; closed, mutant);
∆= cell mass (g per l; open, parent; closed, mutant);
□= substrate (g per l) ; open, parent; closed, mutant).
Error bars represent standard deviation among three replicates.