Consulta: subjectFacets:"Ion transport"
Registros recuperados: 5
Data/hora: 01/06/2024 09:50:50

S'acclimater à des salinités et températures changeantes : un focus sur la branchie chez le loup européen Dicentrarchus labrax
Provedor de dados: 5
Autores: Masroor, Waliullah.
The European sea bass Dicentrarchus labrax undertakes seasonal migrations to estuaries and lagoons that are characterized by fluctuations in environmental conditions. It is unclear to what extent salinity acclimation mechanisms are affected at temperatures higher than in the sea, as usually encountered in transitional waters in spring and summer. In this study, juvenile sea bass were pre-acclimated to seawater (SW) at 18 °C (temperate) or 24 °C (warm) for two weeks and then transferred to either fresh water (FW) or SW at the considered temperatures. We have shown that sea bass are able to efficiently maintain blood osmolality at 24 °C at both salinities. However, temperature increase induced significant changes regarding several physiological traits...
Tipo: Text
Palavras-chave: Salinité; Poisson téléostéen; Écophysiologie; Branchies; Transport ionique; Salinity; Ecophysiology; Teleost fish; Temperature; Gills; Ion transport.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61175/64661.pdf

Approche ecophysiologigue et ultrastructurale de l'osmoregulation chez les crustaces decapodes
Provedor de dados: 5
Autores: Pequeux, A; Lignon, J.
This paper deals mostly with recent physiological data on ion transport across the gill tissue and an attempt is made to correlate them with blood osmoregulation and ecological distribution in euryhaline decapods. A particular attention is paid to the gills of the fully euryhaline Chinese crab Eriocheir sinensis . Supporting this ecophysiological approach, there is an important ultrastructural analysis of the gill epithelium under various salinity conditions. The possible part played by the cuticle in ions movements is also considered.
Tipo: Text
Palavras-chave: Eriocheir sinensis; Cancer pagurus; Maia squinado; Carcinus maenas; Decapoda; Malacostraca; Ion transport; Gills; Ecophysiology; Cuticles; Ultrastructure; Salinity tolerance.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1387.pdf

Plasma membranes from insect midgut cells
Provedor de dados: 42
Autores: Terra,Walter R.; Costa,Rita H.; Ferreira,Clélia.
Plasma membranes from insect midgut cells are separated into apical and basolateral domains. The apical domain is usually modified into microvilli with a molecular structure similar to other animals. Nevertheless, the microvillar structure should differ in some insects to permit the traffic inside them of secretory vesicles that may budd laterally or pinch-off from the tips of microvilli. Other microvillar modifications are associated with proton-pumping or with the interplay with an ensheathing lipid membrane (the perimicrovilllar membrane) observed in the midgut cells of hemipterans (aphids and bugs). The perimicrovillar membranes are thought to be involved in amino acid absorption from diluted diets. The microvillar and perimicrovillar membranes have...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microvillar membranes; Perimicrovillar membranes; Nutrient absorption; Ion transport; Water transport; Midgut molecular physiology.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000200007

Action of the extracts of Pluchea sagittalis on the absorptive characteristics of the gastrointestinal tract
Provedor de dados: 52
Autores: Burger,Marilise E.; Baldisserotto,Bernardo; Teixeira,Elisângela P.; Soares,Joceana.
Pluchea sagittalis (Lam.) Cabrera, (quitoco or erva lucera) is commonly used to treat digestive disorders in Southern Brazil and countries of the South Cone. The crude aqueous extracts from the leaves, stalks or flowers were used in acute oral toxicity in mice and in pharmacological studies to determine the gastrointestinal transport of water, sodium, and potassium in rats. The oral administration of 5000 mg/kg of extracts examined did not produce signs of intoxication nor induce the death of any mice during the period of 14 days. The extracts from the leaves and stalk have reduced the absorption of water in the jejunum and jejunum and ileum, respectively with relation to the control. There was an absorption of sodium with the administration of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pluchea; Ion transport; Gastrointestinal tract absorption; Acute toxicity.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000100012

Impact of acute undernutrition on growth, ileal morphology and nutrient transport in a murine model
Provedor de dados: 56
Autores: Sampaio,I.C.; Medeiros,P.H.Q.S.; Rodrigues,F.A.P.; Cavalcante,P.A.; Ribeiro,S.A.; Oliveira,J.S.; Prata,M.M.G.; Costa,D.V.S.; Fonseca,S.G.C.; Guedes,M.M.; Soares,A.M.; Brito,G.A.C.; Havt,A.; Moore,S.R.; Lima,A.A.M.
Undernutrition represents a major public health challenge for middle- and low-income countries. This study aimed to evaluate whether a multideficient Northeast Brazil regional basic diet (RBD) induces acute morphological and functional changes in the ileum of mice. Swiss mice (∼25 g) were allocated into two groups: i) control mice were fed a standard diet and II) undernourished mice were fed the RBD. After 7 days, mice were killed and the ileum collected for evaluation of electrophysiological parameters (Ussing chambers), transcription (RT-qPCR) and protein expression (western blotting) of intestinal transporters and tight junctions. Body weight gain was significantly decreased in the undernourished group, which also showed decreased crypt depth but no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Undernutrition; Ion transport; Intestinal absorption.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016001000607