DNA microarray analysis of long-term stationary phase-induced gene expression in <i>E. coli</i> grown in LB broth.

<p>The Volcano plot depicts gene expression in 28 days old <i>E. coli</i> culture at 0.8 OD (OD_600nm) cultured in LB broth compared to the freshly grown stationary phase <i>E. coli</i> culture control. Genes that are represented on the right side of the volcano-axis are up regulated and those that are on left side of the axis are down regulated. Out of the 4377 genes (O) analysed, 25 genes were up-regulated (•) and 179 were down regulated (•). Only those genes that showed more than 2.0 fold change in expression and a P value <0.05 were identified as either up- or down-regulated. The X-axis represents the log2 fold change and the dark vertical lines represent cut-offs at 2.0 fold decrease and increase. The y-axis represents the p-values and the dark horizontal line indicates a –log10 p value cut-off of 0.05.