FIG. 4.

Growth comparison of the wild type and the fdxN deletion mutant in mixed culture. The wild type and the fdxN deletion mutant were grown in an oxygen-controlled bioreactor on N₂ in mixed culture. (A) Growth measured as turbidity (OD₅₇₈). (B) Relative amount of each of the two strains at different time points during exponential growth of the mixed culture, determined by colony hybridization. Black bar, wild type; white bar, fdxN deletion strain. Values are means with standard deviations. For details of the calculations, see Materials and Methods.