SEARCH Articles Figures Tables Isotope effects primary Isotope kinetic Isotopic kinetic Kinetic deuterium isotope effects primary Kinetic isotope effects Kinetic isotope effects primary hydrogen-deuterium Kinetics isotope effect Primary and secondary kinetic isotope effects Primary kinetic hydrogen isotope effects Primary kinetic isotope effect for glucose-6-phosphate isomeras Primary kinetic isotope effect of sulfur Primary solvent kinetic isotope effect The Origin of Primary Kinetic Isotope Effects