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The impact of different concentrations of zinc, copper, and propionate on conjugation frequency of an E. coli donor and a Salmonella Typhimurium recipient after correction for the stress impact on bacterial growth. Mean values and standard deviations are displayed for conjugation frequencies (CF) calculated as CF(D) = transconjugants/donor or CF(R) = transconjugants/recipients; SIF = stress impact factor.
