Figure 2

Images of substrates with and without biofilm and their corresponding SEM micrographs: (a) Photographs of the clean coupons before any biofilm was grown on it, (b) Photograph showing the coupons after the growth of biofilm on the surface with Gram staining and (c) SEM micrographs the clean coupons before the growth of biofilms (Left to Right: Glass, Steel, Brass and Ceramic) and (d) SEM micrographs of the coupons with biofilm (Left to Right: Glass, Steel, Brass and Ceramic).