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The influence of salinity acclimation on free amino acids and enzyme activities in the intestinal mucosa of rainbow trout, Oncorhynchus mykiss (Walbaum) Auerswald, L.; Jürß, K.; Schiedek, D.; Bastrop, R. (1997). The influence of salinity acclimation on free amino acids and enzyme activities in the intestinal mucosa of rainbow trout, Oncorhynchus mykiss (Walbaum). Comp. Biochem. Physiol., Part A Physiol. 116: 149-155. https://dx.doi.org/10.1016/S0300-9629(96)00167-3 In: Comparative Biochemistry and Physiology. Part A. Physiology. Pergamon: Oxford. ISSN 0300-9629; e-ISSN 1531-4332

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Beschikbaar in	Auteurs
VLIZ: Open access 57367 [ download pdf ]

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Trefwoorden

Acids > Organic compounds > Organic acids > Amino acids Digestion Environmental effects > Salinity effects Enzymatic activity Metabolism > Animal metabolism Osmoregulation Oncorhynchus mykiss (Walbaum, 1792) [WoRMS] Marien/Kust; Zoet water

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Auteurs		Top
Auerswald, L. Jürß, K. Schiedek, D. Bastrop, R.

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Abstract

Postprandial changes of Arg, Leu, Val, Ala, Asp, Glu, Gly, Pro and Tau as well as activities of three enzymes of the transdeamination system in the midgut mucosa and, for comparison, in the liver of freshwater and seawater acclimated Oncorhynchus mykiss were studied. In the mucosa a postprandial increase of Arg, Leu, Val, Ala, Asp, Glu, Gly and Pro occurred. In contrast, only the postprandial Arg level increased strongly in the liver. Levels of Leu, Val, Ala, Asp, Glu, Gly, Pro and Tau remained stable. Concentrations of Ala, Asp, Glu and Pro are higher in the liver than the mucosa. Tau is the most important osmotic effector in both organs, but its concentration is much lower in the liver. Its postprandial concentrations remained stable in both tissues but were significantly higher in seawater trout. The trend of a stronger postprandial rise of Arg, Leu, Val, Ala, Asp, Glu, Gly and Pro levels in seawater trout than in freshwater trout was shown. In mucosa tissue aspartate aminotransferase activities were higher in seawater trout. Ratios of aspartate aminotransferase, alanine aminotransferase and glutamate dehydrogenase are similar to those of the gills.

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