Fig. 5

a Medium pH in K. oxytoca DSM 29614 cultures performed in FeC (empty circles) and in NaC (solid circles) medium under aerobic and anaerobc condition, respectively. b Determination of total Fe (empty circled), Fe2+ (solid circles) and ratio between polysaccharide (CHO) and proteins (PRT) of harvested DSM 29614 cells during anaerobic growth in FeC medium. Standard deviation values are reported as vertical bars