title: An improved method for separation of urea N and glutamine amide N for  15 N metabolic studies.
mesh_terms: D000641:Ammonia / Q000302:isolation & purification; D002852:Chromatography, Ion Exchange; D005973:Glutamine / Q000302:isolation & purification*; D006868:Hydrolysis; D008722:Methods; D009587:Nitrogen Isotopes; D014508:Urea / Q000302:isolation & purification*; D014510:Urease
chemical_list: D009587:Nitrogen Isotopes; D005973:Glutamine; D000641:Ammonia; D014508:Urea; D014510:Urease