Figure 1. SEM images showing the effects of a treatment with either CO₂ aerosols or hydrolytic enzymes on the E. coli biofilms grown for one day.

(a) Untreated control chip showing the presence of an extensive E. coli biofilm on the Si surface. (b) Biofilm after CO₂ aerosol treatment. (c) Image of E. coli biofilm after being soaked in 25 mM HEPES buffer for two hours. (d) E. coli biofilm after treatment with HEPES buffer containing both Proteinase K and DNase I.