Relative expression of genes coding for respiratory enzymes in <i>E. coli</i> MG1655 (2a) and mutant strain TBE029 (2b).

<p>Transcription of NADH dehydrogenase I and II and of the cytochrome oxidases <i>bo</i>, <i>bd-I</i> and <i>bd-II</i>. The transcription pattern was analyzed in cells from glucose-limited continuous cultures and normalized to the reference genes <i>recA, rpoD</i> and <i>ybhC</i> and to the expression of the wild-type strain under anaerobic conditions. TBE029: Δ<i>nuoB</i>. <i>ndh</i>: NADH dehydrogenase II, <i>nuoN</i>: NADH dehydrogenase I, <i>cyoA</i>: subunit of cytochrome oxidase <i>bo</i>, <i>cydA</i>: subunit of cytochrome oxidase <i>bd-I</i>, <i>appC</i>: subunit of cytochrome oxidase <i>bd-II</i>.