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- W1998817390 abstract "The effect of the polyvalent cations calcium, lead, copper, chromium, iron III, and thorium on Streptococcus faecalis was investigated by microelectrophoresis and by growth inhibition measurements. Thorium and the (hydrolyzed) ferric ion inverted the charge of the bacteria from negative to positive. The other cations merely reduced the absolute value of the negative ζ-potential at the concentrations investigated, which were limited because all measurements were performed at an ionic strength of 0.01 M. The order of effectiveness in changing the ζ-potential was thorium ≅ ferric ≫ chromium ≫ copper > lead > calcium, in accordance with the Schulze–Hardy rule. The effect of the salts on the growth of the bacteria was studied by the pour plate, growth curve, and turbidity methods. The order of effectiveness in inhibiting the bacterial growth was thorium > ferric > copper. The other cations produced no detectable growth inhibition at concentrations up to about 0.003 M. With the exception of chromium, there is a rank-order correlation between the ability of the polyvalent metal salts to reduce the ζ-potential of the bacteria and to inhibit their growth." @default.
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- W1998817390 date "1973-11-01" @default.
- W1998817390 modified "2023-09-26" @default.
- W1998817390 title "Electrokinetic Studies of Bacteria III: Effect of Polyvalent Metal Ions on Electrophoretic Mobility and Growth of Streptococcus faecalis" @default.
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- W1998817390 doi "https://doi.org/10.1002/jps.2600621112" @default.
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