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1351 - 1375 of 1436
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This study was designed to compare hormonal responses in saltwater-acclimated Atlantic salmon (Salmo salar) smolt subjected to a gradual (1C degree /day for 5 days) or acute (5C degree /day) temperature change from their ambient conditions to determine whether a stress response was elicited. Plasma ...
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Livers were collected from six male and six female white sucker (Catostomus commersoni) at both a bleached-kraft pulp mill effluent (BKME)-exposed site and a reference site during the 1992 spring spawning migration. A semistandardized methodology for 7-ethoxyresorufin-O-deethylase (EROD) analysis wa...
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In the present investigation, in vivo microdialysis was used to measure the concentration of estrogen in the parabrachial nucleus (PBN) and plasma of male and ovariectomized female Sprague-Dawley rats supplemented with either estrogen (OVX-E(2)) or saline (OVX-S) following visceral afferent activati...
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Lasalocid and pyrimethamine was administered to American lobsters infected with A. haemophila. Lasalocid was found to be toxic and acute mortality was observed, when administered in vivo in both infected and uninfected lobsters. Pyrimethamine was found very efficient to treat these ciliates at repea...
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Pseudopterosins and pseudopteroxazole are intriguing marine natural products that possess notable antimicrobial activity with a commensurate lack of cytotoxicity. New semi-synthetic pseudopteroxazoles, pseudopteroquinoxalines and pseudopterosin congeners along with simple synthetic mimics of the ter...
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We have analyzed the segregation of restriction fragment length polymorphisms (RFLPs) associated with 9 anonymous probes detecting loci DXS10, DXS15, DXS19, DXS37, DXS51, DXS52, DXS98, DXS99, and DXS100 and probes for HPRT and F9 in a set of 40 families segregating fragile X (fra(X]. Using two-point...
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The physiological effects of repeated exposure to 9 mg l(-1) chloramine-T, a common aquaculture disinfectant for rainbow trout, were examined using a graded hypoxic challenge. Using an extracorporeal circulation, continuous measurements of blood PO2, PCO2 and pH were made and correlated with decreas...
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The morphology and the histochemistry of the mucus of the pleuronectid stomach were examined using light and electron microscopy. The stomach of the winter flounder (Pleuronectes americanus) and the yellowtail flounder (Pleuronectes ferruginea) possessed a glandular or cardiac region and an aglandul...
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The functional significance of neuropeptides and neurohormones throughout the neuroaxis has been the focus of considerable research over the past 25 years. These "gut peptides" or "reproductive hormones" have been localized within nuclei responsible for the relay of visceral affe...
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The role of neuropeptides in ascending visceral pathways was investigated by recording the changes in the response of thalamic neuronal activity evoked by vagal stimulation before and after peptide injection in the parabrachial nucleus (PB). Male Wistar rats (n = 25) were anesthetized with chloral h...
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1. The ability of fish gills to transfer heat was measured by applying a heat pulse to blood in the ventral aorta and measuring it before and after passing through the gills of a teleost, Hemitripterus americanus. 2. 80-90% of heat contained in the blood is lost during passage through the gills. 3. ...
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The objectives of this study were to document the effects of moderate aerobic exercise on insulin secretion and other metabolic indices in fa/fa rats and to determine if a high-fat (HF) diet altered these effects. Six-week-old fa/fa and lean Zucker rats were either sedentary or exercised by daily sw...
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We have previously reported evidence of BDNF upregulation and increased neurogenesis in rat organotypic hippocampal slice cultures (OHSC) after a transient excitotoxic injury to the hippocampal CA1 area induced by low concentrations of the AMPA/kainate receptor agonist domoic acid (DOM). The changes...
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We review studies claiming that fish feel pain and find deficiencies in the methods used for pain identification, particularly for distinguishing unconscious detection of injurious stimuli (nociception) from conscious pain. Results were also frequently misinterpreted and not replicable, so claims th...
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We investigated the interaction of temperature and copper (Cu) on mitochondrial bioenergetics to gain insight into how temperature fluctuations imposed by natural phenomena or anthropogenic activities would modulate the effects of Cu on cellular energy homeostasis. Mitochondria were isolated from ra...
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The goal of the present study was to elucidate the modulatory effects of cadmium (Cd) on hypoxia-reoxygenation-induced mitochondrial dysfunction in light of the limited understanding of the mechanisms of multiple stressor interactions in aquatic organisms. Rainbow trout (Oncorhynchus mykiss) liver m...
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Increased accountability has been a catalyst for the reformation of curriculum and assessment practices in postsecondary schools throughout North America, including veterinary schools. There is a call for a shift in assessment practices in clinical rotations, from a focus on content to a focus on as...