The Influence of Salinity Acclimation on Free Amino Acids and Enzyme Activities in the Intestinal Mucosa of Rainbow Trout,Oncorhynchus mykiss (Walbaum) |
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| Institution: | 1. Universität Rostock, Fachbereich Biologie, Zoologisches, Institut, Universitätsplatz 02, D-18055 Rostock, Germany;2. Institut für Ostseeforschung, D-18119 Warnemünde, Germany;1. Department of Civil and Environmental Engineering, National Institute of Technology, Fukushima College, Japan;2. New Industry Creation Hatchery Center, Tohoku University, Japan;3. Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Japan;4. Center for Water Cycle, Marine Environment and Disaster Management, Kumamoto University, Japan;5. Institute for the Advanced Study of Sustainability, United Nation University, Japan;1. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Qingdao, 266071, China;2. Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China;3. Ocean University of Shanghai, Shanghai, 201306, China;4. Yantai Tianyuan Aquatic Limited Corporation, Yantai 264003, China;1. Clinic of Neurosurgery, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia;2. Department of Neurosciences and Reproductive and Odontostomatological Sciences, Division of Neurosurgery, Università degli Studi di Napoli Federico II, Naples, Italy;3. Clinic of Neurosurgery, Clinical Centre of Serbia, Belgrade, Serbia;4. Institute for Oncology and Radiology of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia |
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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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