Figure 2 | Scientific Reports

Figure 2

From: Photodynamic effect of TPP encapsulated in polystyrene nanoparticles toward multi-resistant pathogenic bacterial strains: AFM evaluation

Figure 2

Photoinduced antibacterial activity of the TPP-NPs (1.5 × 1012 NPs/ml) at different light dose. TPP-NPs dispersions (3 × 1012 NPs/ml) were mixed 1:1 with a dispersion of MRSA-S. aureus (A), ESBL-K. pneumoniae (B), E. faecalis (C) and P. aeruginosa (D). Samples of bacteria with TPP-NPs were exposed to the irradiation for 0.5, 1, 5 and 10 min, which correspond to the specific doses of irradiation of 1.62, 3.24, 16.2 and 32.4 J/cm2, respectively. The results show the estimated average logarithm of the colony forming units (CFUs) observed on the agar plates for the irradiated and nonirradiated samples from 3 independent tests at room temperature. The level of significance of the test is often denoted by asterisks: *p < 0.05 (significant), **p < 0.01 (very significant), ***p < 0.001 (extremely significant).

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