This is in sharp contrast to the results observed with E.
coli (Fig. 7), V. cholerae (Fig. 8), S. disenteriae (Fig. 9) and B. fragilis
(Fig. 10) where chitin and chitosan were equally effective as antimicrobial
agents. This suggests that the gram-negative strains P.
aeruginosa ATCC 27853 and P. melaninogenica are more resistant to
antimicrobial agents