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Penetration profile of P. fluorescens WCS365 biofilms after exposure to (A) Bare-SiNPs, (B) Amine-SiNPs, (C) Epoxy-SiNPs and (D) Hydroxy-SiNPs. The x-axis shows the depth of penetration of biofilms, where 0 μm represents the top layer of biofilm and the dashed vertical line (at approximate average thickness of the 14.7 μm) represents the bottom layer of biofilm. The y-axis is the normalized fluorescence intensity of red channel.
