SEARCH Articles Figures Tables DETERMINATION OF NITROGEN FRACTIONS Fractionation effects, nitrogen retention Neutral-nitrogen fractions from Nitrogen fractions, transfer Nitrogen isotopes, fractionation Nitrogen isotopic fractionation Nitrogen isotopic fractionation process Nitrogen mole fraction Nitrogen trichloride fractionation Nitrogenous constituents fractionation Utilization of the Protein Fraction (Nitrogenous Compounds)