Fig. 2.

Hemin-dependent growth of the two acI strains. (A and B) Effect of various concentrations (0 to 100 nM) of hemin on the growth of “Ca. P. rubra” IMCC25003 (A) and “Ca. P. aquatilis” IMCC26103 (B). (C) Effect of various concentrations (0 to 100 nM) of riboflavin on the growth of IMCC26103 in the presence of hemin (10 nM). (D) Effect of various concentrations (0 to 100 nM) of hemin on the growth of IMCC26103 in the presence of riboflavin (10 nM). The culture medium without hemin and riboflavin was designated as “Control” and the medium with 10 U mL⁻¹ of bovine liver catalase was designated as “Catalase.” All experiments were performed in triplicate. Error bars indicate the SE. Note that error bars smaller than the size of the symbols are hidden.