Figure 4From: Characterization of biofilm matrix, degradation by DNase treatment and evidence of capsule downregulation in Streptococcus pneumoniae clinical isolatesDNA staining of the pneumococcal EPS matrix and disruption with DNase. Fig. 4A. Biofilms stained with PicoGreen, a dsDNA stain, and Syto 59 shows that S. pneumoniae biofilms treated with 1000 μg ml-1 Pulmozyme (+) were substantially reduced compared to untreated biofilms (-) in both high and low BFI strains. Scale bar = 30 μm. Figure 4B. Quantification of reduction in biofilm volume (total biomass) measured by COMSTAT upon treatment with different concentrations of Pulmozyme: Untreated controls □; 1 μg ml-1 Pulmozyme ▩; 100 μg ml-1 Pulmozyme ⊟; 1000 μg ml-1 Pulmozyme ■. Bars show average of PicoGreen signal, which stains extracellular dsDNA, and Syto59, which stains intracellular nucleic acid. (Error bars represent standard error of the mean; n = 10; 5 randomly chosen microscopic fields from duplicate experiments. *Significantly different from untreated controls (P values < 0.05); ** (P values < 0.01). Statistical comparisons were made using one-way analysis of variance (ANOVA) (Excel 2000, Microsoft).Back to article page