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Growth kinetics of bacterial cells after TiO2 exposure. (A,B) L. lactis IBB477 and (C,D) E. coli K12 MG1655 subjected to 0.0 (black squares), 32.0 (crosses), 62.5 (circles), 125.0 (triangles), and 320.0 (diamonds) μg/mL TiO2-NPs P25 (A,C in green) or food-grade E171 (B,D in orange) in aggregated (dark color) vs. dispersed (light color) forms. Data are the means ± SD. See Supplementary Material 2 for statistical analysis.
