Net Ion Fluxes
Mostrando 1-12 de 48 artigos, teses e dissertações.
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1. EFEITO DO CLORETO DE SÓDIO NA DIETA, DUREZA E pH DA ÁGUA NA SOBREVIVÊNCIA, CRESCIMENTO E FLUXOS IÔNICOS DE JUVENIS DE JUNDIÁ (Rhamdia quelen) / EFFECT OF DIETARY SODIUM CLORET, WATER HARDNESS AND pH ON SURVIVAL, GROWTH AND IONIC FLUXES OF SILVER CATFISH (Rhamdia quelen) JUVENILES
The purpose of this study was to verify the effect of dietary salt (NaCl) supplementation, water hardness and pH on growth, survival and ionoregulation of silver catfish (Rhamdia quelen) juveniles. In the first experiment, juveniles were fed with diets supplemented with 0.0; 0.5; 1.0 e 2.0 % NaCl and exposed to pH 5.5, 7.0 and 9.0 for 35 days. In the second
Publicado em: 2008
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2. EFFECT OF WATER pH AND HARDNESS IN Rhamdia quelen JUVENILES INFECTED WITH Ichthyophthirius multifiliis (Fouquet, 1876) / EFEITO DO pH E DUREZA DA ÁGUA EM JUVENIS DE Rhamdia quelen INFECTADOS COM Ichthyophthirius multifiliis (Fouquet, 1876)
O objetivo deste estudo foi determinar a intensidade da infecção pelo Ichthyophthirius multifiliis, assim como o fluxo líquido de íons (Na+, K+ e Cl-), em juvenis de jundiá expostos a diferentes pHs (5,0; 6,0; 7,0; 8,0 e 9,0 por dezesseis dias), pH (5,0 e 7,0) e dureza (20, 60 e 120 mg CaCO3/L por dezesseis dias) e os parâmetros de estresse oxidativo n
Publicado em: 2008
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3. Electrical parameters and water permeability properties of monolayers formed by T84 cells cultured on permeable supports
T84 is an established cell line expressing an enterocyte phenotype whose permeability properties have been widely explored. Osmotic permeability (P OSM), hydraulic permeability (P HYDR) and transport-associated net water fluxes (J W-transp), as well as short-circuit current (I SC), transepithelial resistance (R T), and potential difference (deltaV T) were me
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-01
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4. Low pH and calcium effects on net Na+ and K+ fluxes in two catfish species from the Amazon River (Corydoras: Callichthyidae)
The present study analyzes Na+ and K+ disturbances caused by low pH in two catfish species from the Amazon River. Corydoras adolfoi inhabits ion-poor, black-stained, low pH (3.5-4.0) waters, while C. schwartzi is native to ion-rich waters at circumneutral pH. Fish were exposed to pH 3.5 Ca2+-free, and Ca2+-enriched (~500 µmol/l) water to determine the prote
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-03
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5. Interaction between sodium and chloride transport in bovine tracheal epithelium.
The active transport of Na and Cl across bovine tracheal epithelium was studied in vitro by measuring 22Na and 36Cl fluxes under short-circuit conditions. Under basal conditions, both net Cl secretion and net Na absorption were observed: the sum of these two net fluxes accounted for 85% of the measured short-circuit current. The rate of spontaneous Cl secret
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6. Effect of Cholera Enterotoxin on Ion Transport across Isolated Ileal Mucosa
The effects of cholera enterotoxin on intestinal ion transport were examined in vitro. Addition of dialyzed filtrate of Vibrio cholerae (crude toxin) to the luminal side of isolated rabbit ileal mucosa caused a delayed and gradually progressive increase in transmural electric potential difference (PD) and shortcircuit current (SCC). A similar pattern was obs
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7. Steady-state analysis of ion fluxes in Necturus gall-bladder epithelial cells.
1. The steady-state fluxes of Na, K and Cl ions have been measured in Necturus gall-bladder epithelium by a technique that involves labelling the cells with tracer ions from the mucosal bath only, whilst the serosa is kept at low specific activity. After removing tracer, the efflux is followed into the serosal bath, revealing two exponential components. 2. T
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8. Root Excision Decreases Nutrient Absorption and Gas Fluxes 1
The roots of barley plants (Hordeum vulgare L. cv Steptoe) were monitored before and after excision for net uptake of carbon dioxide, oxygen, ammonium, potassium, nitrate, and chloride and for their content of sucrose, glucose, fructose, and malic acid. All fluxes began to attenuate within 2 hours after excision. Net potassium uptake returned to control leve
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9. Fluxes of H+ and K+ in Corn Roots 1: Characterization and Stoichiometries Using Ion-Selective Microelectrodes
We report here on an experimental system that utilizes ion-selective microelectrodes to measure the electrochemical potential gradients for H+ and K+ ions within the unstirred layer near the root surface of both intact 4-day-old corn seedlings and corn root segments. Analysis of the steady state H+ and K+ electrochemical potential gradients provided a simult
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10. Effect of Azetidine 2-Carboxylic Acid on Ion Uptake and Ion Release to the Xylem of Excised Barley Roots 1
Azetidine 2-carboxylic acid (AZ) was used as an analog of proline to investigate further the relationship between protein synthesis and ion transport. AZ does not inhibit protein assembly, but the proteins formed are ineffective as enzymes. At relatively low concentrations (50 μM) AZ was a potent inhibitor of release of ions to the xylem of excised roots of
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11. Oscillations in H+ and Ca2+ Ion Fluxes around the Elongation Region of Corn Roots and Effects of External pH.
Net fluxes of H+ and Ca2+ around the elongation region of low-salt corn (Zea mays L.) roots were measured using the microelectrode ion flux estimation (MIFE) technique. At pH 5.2 two oscillatory components were found. Fast, 7-min oscillations in H+ flux were superimposed on slow oscillations of about 1.5 h. Fast oscillations in Ca2+ flux showed a strong depe
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12. Light-Induced Changes in Hydrogen, Calcium, Potassium, and Chloride Ion Fluxes and Concentrations from the Mesophyll and Epidermal Tissues of Bean Leaves. Understanding the Ionic Basis of Light-Induced Bioelectrogenesis1
Noninvasive, ion-selective vibrating microelectrodes were used to measure the kinetics of H+, Ca2+, K+, and Cl− fluxes and the changes in their concentrations caused by illumination near the mesophyll and attached epidermis of bean (Vicia faba L.). These flux measurements were related to light-induced changes in the plasma membrane potential. The inf
American Society of Plant Physiologists.