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Nitrate reduction and nitrite formation by L. plantarum WCFS1 in the presence of glucose. The bars indicate the average values ± the standard deviation. Wild-type cells were grown overnight in anaerobic batch cultures in modified MRS broth. Acetate and citrate were omitted from the standard MRS broth recipe. This medium was supplemented with heme, menaquinone, 16 mM nitrate, and various concentrations of glucose (glu): 0, 5, 10, 20, and 40 mM.
