Silk, D B Use of a peptide rather than free amino acid nitrogen source in chemically defined "elemental" diets. [electronic resource] - JPEN. Journal of parenteral and enteral nutrition - 548-53 p. digital Publication Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial ISSN: 0148-6071 Standard No.: 10.1177/0148607180004006548 doi Subjects--Topical Terms: AdultAmino Acids--metabolismAnimalsCaseins--metabolismFish ProductsFishesFood, FormulatedHumansIntestinal AbsorptionJejunum--metabolismLactalbumin--metabolismMaleNitrogen--metabolismNutritive ValuePapain--metabolismParenteral NutritionParenteral Nutrition, TotalPeptides--metabolismPerfusionProtein Hydrolysates--metabolismTrypsin--metabolism