Figure 5From: Evaluation of three industrial Escherichia coli strains in fed-batch cultivations during high-level SOD protein productionAnalysis of the nucleotide ppGpp. Levels of ppGpp were analyzed by HPLC during fed-batch cultivations of E. coli HMS174, BL21, and RV308 [25]. Data shown are means ± standard error of the mean. Recombinant protein synthesis was induced with IPTG at feed-hour seven.Back to article page