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Histogram of the antibacteria activity of clay–nanocomposites pellets against E. coli and S. aureus in sterile aqueous media after 48 h of incubation. C1, C2, C3, Z1, Z2 and Z3, respectively relates to: clay/CuO/Ag-1, clay/CuO/Ag-2, clay/CuO/Ag-3, clay/ZnO/Ag-1, clay/ZnO/Ag-2 and clay/ZnO/Ag-3.
