1.8.1.7 Cd2+ 0.05 mM, 2fold stimulation 676198 1.8.1.7 diphosphate activates 394751 1.8.1.7 Fe3+ stimulates, AC50 value: 0.327 mM. Enzymatic activity in the presence of nontoxic iron (0.87 and 3 ppm) is activated, no changes are seen in the presence of toxic iron concentrations (30 and 300 ppm) 761408 1.8.1.7 KBr below 0.1 M 394757 1.8.1.7 KCl IC50: 0.51 M 675954 1.8.1.7 KH2PO4 below 0.1 M 394757 1.8.1.7 Mg2+ 0.25, 1.1fold activation 764906 1.8.1.7 Mg2+ activates 725617 1.8.1.7 Mg2+ slight activation 394770 1.8.1.7 Mn2+ activates 394770