Fig. 2
From: On the control mechanisms of the nitrite level in Escherichia coli cells: the mathematical model
Effect of nitrite concentration on nrfABCD and nirBDC operons expression during anaerobic cell growth. Dots represent experimental values of activities of the NrfA-β-gal and NirB-β-gal chimeric proteins measured in [1] and approximating their theoretical curves m Nrf (u) (curve 1) and m Nir (u) (curve 2). The X-axis – steady-state nitrite concentration (u) in the chemostat (mM); the Y-axis (left) – the NrfA-β-gal chimeric protein relative activity, (right) – the NrfB-β-gal chimeric protein relative activity. The steady-state nitrite concentration in the chemostat used as a scale bar on the X-axis was calculated earlier [35], and based on the data from the previous research [1]