Calorimetric studies of ternary complexes of Ni(II) and Cu(II) nitrilotriacetic acid and N-acetyloligohistidines

Representative calorimetric titration of N-acetyloligohistidines binding to nickel ions. The inset illustrates plots of the integrated heats versus Ni2+-NTA/N-acetyloligohistidine ligand molar ratio.122