FIGURE 1.

Effect of the deletion of saeS on the sa1804 promoter transcription activity. Both bioluminescence signals and cell growth were monitored at different phases of growth at 37°C by measuring the light intensity with a Chiron luminometer and optical density at 600 nm (OD₆₀₀) with a SpectraMax plus Spectrophotometer. Relative light unit (RLU) was calculated with the bioluminescence intensity divided by the optical density in the same time of culture. The experiments were repeated at least three times. Solid column represents the saeS deletion mutant and open column represents the parental wild type strain.