Figure 5
From: Study of CFU for individual microorganisms in mixed cultures with a known ratio using MBRT
Comparison of the slope of methylene blue decoloration of growth of B. subtilis (open triangle) and introduction of E. coli at t = 6 h during the growth of B. subtilis (open circle). It is clearly seen that the deviation at 6 h in the value of the slope indicated that the cell number had indeed increased. This method can be used to monitor cell growth of pure cultures. The arrow shows the addition of E. coli in the growth of B. subtilis as a contaminant.