The effects of catecholamines on growth of <i>A</i>. <i>pleuropneumoniae ΔtonB1</i> and <i>ΔtonB2</i> mutants.

<p><i>A</i>. <i>pleuropneumoniae</i> was cultured in TSB medium overnight and then sub-cultured into CDM using an inoculation dose of 10⁴ CFU/ml. <i>A</i>. <i>pleuropneumoniae</i> 4074 and the mutants were sub-cultured in CDM containing 50μM of Epi and 1/40 of serum (S in figure A) or 400μg/ml ATF (figure B). Optical densities of bacterial cultures (OD_600nm) were recorded at selected time points. Data are shown as means ± SD from four independent replications.