FIG. 1.

ArcA increases resistance of S. enterica serovar Enteritidis to ASN. Cultures of SE2472, SE8743, and SE8743 transformed with vector pRB3-273C or plasmid pRB3arcA were grown in the presence of 15 mM sodium nitrite in pH 5.0 LB medium, and bacterial concentrations were determined by plating. The values are the concentrations of surviving bacteria after exposure to ASN. At least three experiments were performed, and the results of a representative experiment performed in triplicate are shown. The error bars indicate standard deviations.