3.2 Growth of the recombinant S. cerevisiae
TISTR 5339-XDH The recombinant expression vector pSFAU-XDH was transformed into S. cerevisiae TISTR 5339 cells by electroporation. Positive transformants were selected on YEPD plates containing 5.5 mM formaldehyde. After an incubation of the identified positive recombinant, the strain was inoculated, then a growth experiment was performed and the XDH activity was determined. The recombinant S. cerevisiae TISTR 5339-XDH was inoculated into YEP medium containing 2% xylitol, 2% glucose, and 1% glucose plus 1% xylitol. The growth study of both strains is shown in figure 3.