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Carnitine transport activity of L. monocytogenes LTS4a and DP-L1044. Uptake of 100 mM [14C]carnitine was measured in DP-L1044 (solid symbols) and LTS4a (open symbols) grown to late log phase in Na+-deficient modified Pine's medium at 30°C with 4% KCl (circles) or 8% KCl (squares) (A) or at 7°C without added KCl (B). Transport was assayed as described in Materials and Methods. Error bars indicate ±1 standard deviation of triplicate values.
