title: [Nitrogen metabolism in chronic renal failure. 1. Nitrogen balance and 15N-urea metabolism].
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009584:Nitrogen / Q000378:metabolism*; D014508:Urea / Q000378:metabolism*
chemical_list: D014508:Urea; D009584:Nitrogen