Figure 5.

Aerobic growth of SOD-deficient E. coli JI132 strain in the presence or absence of porphyrins or MnCl₂ (at 50, 500, 1000 or 5000 nM) in 5AA medium at the 13^th hour. Readings were taken at 700 nm. Although “HBr₈TM-3-PyP³⁺” was added to the medium as the metal-free porphyrin, the protective effect of this compound maybe at least in part due to its ability to complex Mn from the medium (see text). Aerobic growth of the wild type E. coli AB1157 was used as control.