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Cytometric analyses of the S. Typhimurium total cell population (T) and of the LD, MD, and HD cell subpopulations obtained after a Radioselectan density gradient centrifugation of a 48-h culture. Cells were stained using a Live/Dead BacLight bacterial-viability kit (Molecular Probes). The abscissa indicates the green fluorescence intensity (FL 1) of cells stained with SYTO 9. The ordinate indicates the red fluorescence intensity (FL 3) of cells stained with propidium iodide.
