Q-RT-PCR and microarray data comparison. RNA from a biological replicate bioreactor experiment was reverse transcribed into cDNA for the Q-RT-PCR. All expression ratios are shown relative to the first timepoint for both Q-RT-PCR (open circles) and microarray data (filled squares). Asterisks represent data below the cutoff value for microarray analysis. Samples were taken every six hours starting from hour 6 and continuing until hour 48. The genes examined were from several operons with different patterns of expression.