5Fig. 5. Effect of initial pH on ethanol fermentation process in co-immobilization of
A. oryzae (a); M. purpureus (b) and S. cerevisiae. Symbol: (C) pH 3.0; (A) pH 4.0; (-)
pH 5.0; (:) pH 6.0.
Fig. 6. Scanning electron microscopic images of the surface and inner co-immobilized gel beads of A. oryzae and S. cerevisiae. (a) surface of the fresh beads (100 ); (b) surface of the
used beads after 13 days incubation (3000 ); (c) inner of the fresh beads (100 ); (d) inner of the used beads after 13 days incubation (4000 ).
Fig. 7. Scanning electron microscopic images of the surface and inner co-immobilized gel beads of M. purpureus and S. cerevisiae. (a) surface of the fresh beads (100 ); (b) surface of
the used beads after 13 days incubation (3000 ); (c) inner of the fresh beads (100 ); (d) inner of the used beads after 13 days incubation (4000