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Extreme acid-base imbalances in salmonids affect gastrointestinal motility. Changes in pH are known to affect cardiac and skeletal muscle in fish and mammalian intestinal smooth muscle preparations. This study was conducted to determine if the contractility of rainbow trout intestinal muscle was sen...
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The immunological release of slow-reacting substance of anaphylaxis (SRS-A) from bovine lung is modulated by several autonomic and autacoid agents. Isoproterenol, a beta-adrenergic agonist, inhibited release of SRS-A, as did cyclic AMP. Phenylephrine also inhibited SRS-A release but through alpha-ad...
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Both antigen- and calcium ionophore A23187-induced airways contractions are dependent on increased concentrations of free intracellular calcium. Antigen, but not A23187, contracted airways in the absence of extracellular calcium, suggesting that antigen-induced airways contraction was partly depende...
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Both antigen- and calcium ionophore A23187-induced airways contractions are dependent on increased concentrations of intracellular calcium. Challenge of isolated tracheal spirals and parenchymal strips from sensitized guinea pigs with antigen or calcium ionophore A23187 in the presence of the intrac...
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Ovalbumin (OA) and calcium ionophore A23187 were used to induce contractions of sensitized guinea-pig tracheal and lung parenchymal preparations in the presence and absence of indomethacin. This model was used to examine the properties of a series of compounds reported to inhibit 5-lipoxygenase or t...
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Large-conductance calcium-dependent potassium (maxi-K) channels play an important role in regulating the tone of airway smooth muscle and the release of bronchoconstrictive substances from nerves in the lung. Crude extracts of Desmodium adscendens, a medicinal herb used in Ghana as a treatment for a...
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Arachidonic acid (AA) and ovalbumin (OA) were used to induce contractions of sensitized guinea pig tracheal spiral (indomethacin-pretreated) and lung parenchymal strip preparations. This model was used to examine the properties of three leukotriene (LT) D4 antagonists and a platelet-activating facto...
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Compound 48/80 and formyl-methionyl-leucyl-phenylalanine (fMLP), but not concanavalin A and dextran, contract isolated guinea pig tracheal spirals and lung parenchymal strips. fMLP induced a brief histamine-independent contraction of parenchymal strips. Tracheal contraction by fMLP was only observed...
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Experiments were designed to determine whether contractility of trout smooth muscle in vitro varied with temperature and if changes occurred at the receptor or intracellular levels. The role of calcium in contractility at various temperatures was also investigated. Isolated trout intestinal segments...
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Sea lice (Lepeophtheirus salmonis, Kroyer) are a major pathogen of farmed Atlantic salmon (Salmo salar). To obtain a better understanding of the host-parasite relationship, we compared protease secretions of L. salmonis into mucus collected from susceptible hosts (Atlantic salmon and rainbow trout, ...
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7th Annual APICS Aquaculture Conf., Truro, NS., March 8
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