3.6.1.28 Br- stimulation by anions with the following order of effectiveness: SCN-, I-, NO3-, Br-, Cl-, membrane-associated enzyme 210006 3.6.1.28 Ca2+ divalent cation requirement is satisfied by Mg2+, Mn2+ or Ca2+ 210006, 210013, 210016 3.6.1.28 Ca2+ maximal activation occurs at a cation to substrate ratio of 1:1 210006 3.6.1.28 Cl- stimulation by anions with the following decreasing order of effectiveness: SCN-, I-, NO3-, Br-, Cl-, membrane-associated enzyme 210006 3.6.1.28 I- stimulation by anions with the following decreasing order of effectiveness: SCN-, I-, NO3-, Br-, Cl-, membrane-associated enzyme 210006 3.6.1.28 Mg2+ divalent cation requirement is satisfied by Mg2+, Mn2+ or Ca2+ 210006, 210013, 210016 3.6.1.28 Mg2+ maximal activation occurs at a cation to substrate ratio of 1:1 210006, 210016 3.6.1.28 Mn2+ divalent cation requirement is satisfied by Mg2+, Mn2+ or Ca2+ 210006, 210013, 210016 3.6.1.28 Mn2+ maximal activation occurs at a cation to substrate ratio of 1:1 210006 3.6.1.28 NO3- stimulation by anions with the following decreasing order of effectiveness: SCN-, I-, NO3-, Br-, Cl-, membrane-associated enzyme. The effect of NO3- is maximal at pH 7-8, it is negligible at pH 6.5 210006