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• W4380291263 abstract "ABSTRACT Marine elasmobranchs are ureosmotic, retaining large concentrations of urea to balance their internal osmotic pressure with that of the external marine environment. The synthesis of urea requires the intake of exogenous nitrogen to maintain whole-body nitrogen balance and satisfy obligatory osmoregulatory and somatic processes. We hypothesized that dietary nitrogen may be directed toward the synthesis of specific nitrogenous molecules in post-fed animals; specifically, we predicted the preferential accumulation and retention of labelled nitrogen would be directed towards the synthesis of urea necessary for osmoregulatory purposes. North Pacific spiny dogfish (Squalus acanthias suckleyi) were fed a single meal of 7 mmol l−1 15NH4Cl in a 2% ration by body mass of herring slurry via gavage. Dietary labelled nitrogen was tracked from ingestion to tissue incorporation and the subsequent synthesis of nitrogenous compounds (urea, glutamine, bulk amino acids, protein) in the intestinal spiral valve, plasma, liver and muscle. Within 20 h post-feeding, we found labelled nitrogen was incorporated into all tissues examined. The highest δ15N values were seen in the anterior region of the spiral valve at 20 h post-feeding, suggesting this region was particularly important in assimilating the dietary labelled nitrogen. In all tissues examined, enrichment of the nitrogenous compounds was sustained throughout the 168 h experimental period, highlighting the ability of these animals to retain and use dietary nitrogen for both osmoregulatory and somatic processes." @default.
• W4380291263 created "2023-06-13" @default.
• W4380291263 creator A5060692633 @default.
• W4380291263 creator A5083894201 @default.
• W4380291263 date "2023-07-01" @default.
• W4380291263 modified "2023-09-23" @default.
• W4380291263 title "Using 15N to determine the metabolic fate of dietary nitrogen in North Pacific spiny dogfish (<i>Squalus acanthias suckleyi</i>)" @default.
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• W4380291263 doi "https://doi.org/10.1242/jeb.244921" @default.
• W4380291263 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37306009" @default.
• W4380291263 hasPublicationYear "2023" @default.
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