Consulta: subjectFacets:"Osmoregulation"
Registros recuperados: 45
Data/hora: 05/06/2024 19:01:38

Incidence de la salinite sur les equilibres de distribution hydrique et ioniques et sur le metabolisme respiratoire dans le muscle blanc, le muscle rouge et la branchie chez le muge Chelon labrosus
Provedor de dados: 5
Autores: Gallis, J; Piquemal, S; Lambert, J; Sergent, P; Rousseau, V.
Oxygen consumption, water, K super(+) and Na super(+) contents were measured in white muscle, red muscle and gill epithelium in the mullet Chelon labrosus) in relation with the duration of fresh water or sea water (1500mOsm) adaptation. The unit respiratory activities in gill and red muscle where respectively 5 and 3 timesmore elevated than in white muscle. The pericellular K super(+)/Na super(+) ratio of the 3 tissues decreased with the fresh water adaptation duration. In the gill, the intracellular K super(+)/Na super(+) ratio was stable while the parameter decreased strongly in the white muscle. The results are discussed in relation to energetic cost of homocellular regulation and homoepithelial regulation.
Tipo: Text
Palavras-chave: Chelon labrosus; Mugilidae; Pisces; Gills; Muscles; Oxygen consumption; Respiration; Ions; Water balance; Osmoregulation; Salinity effects.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1251.pdf

Differential distribution of V-type H+-ATPase and Na+/K+-ATPase in the branchial chamber of the palaemonid shrimp Macrobrachium amazonicum
Provedor de dados: 5
Autores: Boudour-boucheker, Nesrine; Boulo, Viviane; Charmantier-daures, Mireille; Grousset, Evelyse; Anger, Klaus; Charmantier, Guy; Lorin-nebel, Catherine.
V-H+-ATPase and Na+/K+-ATPase were localized in the gills and branchiostegites of M. amazonicum and the effects of salinity on the branchial chamber ultrastructure and on the localization of transporters were investigated. Gills present septal and pillar cells. In freshwater (FW), the apical surface of pillar cells is amplified by extensive evaginations associated with mitochondria. V-H+-ATPase immunofluorescence was localized in the membranes of the apical evaginations and in clustered subapical areas of pillar cells, suggesting labeling of intracellular vesicle membranes. Na+/K+-ATPase labeling was restricted to the septal cells. No difference in immunostaining was recorded for both proteins according to salinity (FW vs. 25 PSU). In the branchiostegite,...
Tipo: Text
Palavras-chave: Osmoregulation; Na+/K+-ATPase; V-type H+-ATPase; Gills; Branchiostegite.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00202/31352/37901.pdf

Salinity tolerance, ontogeny of osmoregulation and zootechnical improvement in the larval rearing of the Caledonian Blue Shrimp, Litopenaeus stylirostris (Decapoda, Penaeidae)
Provedor de dados: 5
Autores: Pham, Dominique; Charmantier, Guy; Wabete, Nelly; Boulo, Viviane; Broutoi, Francis; Mailliez, Jean-rene; Peignon, Jean-marie; Charmantier-daures, Mireille.
The ontogeny of osmoregulationwas investigated in Litopenaeus stylirostris by studying salinity tolerance and osmoregulatory capacity. Shrimp at different larval and postlarval stages were exposed to various salinities and survival was monitored for 24 h. Survival rates exceeded 80% at salinity over 25 ppt (750 mOsm.kg(-1)) at all the stages. At salinities below to 25 ppt, salinity tolerance was higher in nauplii and zoeae than in mysis larvae. Postlarval stages were able to withstand lower salinities, e.g. 6.0 ppt (176 mOsm.kg(-1)) at PL9 stage, but they were more sensitive than larvae to salinities over 35 ppt (1035 mOsm.kg(-1)). Zoea and mysis larvae slightly hyper-regulated at all tested salinities. After metamorphosis, postlarvae progressively...
Tipo: Text
Palavras-chave: Penaeid; Litopenaeus stylirostris; Ontogeny; Osmoregulation; Growth.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00107/21843/20058.pdf

Physiological and biochemical changes of wild and cultivated juvenile pink shrimp Farfantepenaeus duorarum (crustacea: penaeidae) during molt cycle
Provedor de dados: 5
Autores: Luis Bonilla-gomez, Jose; Chiappa-carrara, Xavier; Galindo, Carmen; Jeronimo, Gilberto; Cuzon, Gerard; Gaxiola, Gabriela.
Changes in metabolite levels in hemolymph and hepatopancreas were used as indicators of physiological status of juvenile wild and cultivated Farfantepenaeas. duorarum (Burkenroad, 1939), during hyper-osmoregulatory conditions (salinity 22 ppt, 726 mOsm/kg). We analyzed the relationship between biochemical changes of wild and cultivated shrimp at different molt stages by measurement of osmotic capacity, hemocyanin, acylglycerides, cholesterol, glucose, glycogen and total protein. Biochemical analyses of hemolymph (blood) and hepatopancreas showed a decreasing trend in stages closer to molt and an increasing trend before intermolt. Osmotic capacity and blood proteins indicated a significant effect of the molt stage. Stages A. D1' and D''' showed the greatest...
Tipo: Text
Palavras-chave: Biochemical analysis; F. duorarum; Molt stages; Osmoregulation.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00088/19936/17773.pdf

Physiological basis of interactive responses to temperature and salinity in coastal marine invertebrate: Implications for responses to warming
Provedor de dados: 5
Autores: Torres, Gabriela; Charmantier, Guy; Wilcockson, David; Harzsch, Steffen; Giménez, Luis.
Developing physiological mechanistic models to predict species’ responses to climate‐driven environmental variables remains a key endeavor in ecology. Such approaches are challenging, because they require linking physiological processes with fitness and contraction or expansion in species’ distributions. We explore those links for coastal marine species, occurring in regions of freshwater influence (ROFIs) and exposed to changes in temperature and salinity. First, we evaluated the effect of temperature on hemolymph osmolality and on the expression of genes relevant for osmoregulation in larvae of the shore crab Carcinus maenas. We then discuss and develop a hypothetical model linking osmoregulation, fitness, and species expansion/contraction toward or away...
Tipo: Text
Palavras-chave: Carcinus maenas; Climate change; Coastal zone; Larva; MRNA expression; Multiple stressors; Osmoregulation; Salinity; Temperature.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00692/80408/83516.pdf

Tolerance of disease‐vector mosquitoes to brackish water and their osmoregulatory ability
Provedor de dados: 5
Autores: Kengne, Pierre; Charmantier, Guy; Blondeau‐bidet, Eva; Costantini, Carlo; Ayala, Diego.
Salinity tolerance is an important trait that governs the ecology of disease‐vector mosquitoes by determining their choice of larval habitat, and consequently their ecological and geographical distribution. Here, we used laboratory strains to determine the osmotic responses of larvae of obligate freshwater disease‐vector mosquitoes (Aedes aegypti, Aedes albopictus, Anopheles coluzzii, An. gambiae, Culex pipiens, and Cx. quinquefasciatus) and assessed their relationship with salinity tolerance. First, we analyzed the acute dose–mortality response of fourth‐instar larvae to salinity; then, we measured their hemolymph osmolality after 24‐h exposure to varying salinities. We found that Ae. albopictus was the most tolerant species, followed by An. coluzzii,...
Tipo: Text
Palavras-chave: Adaptation; Aedes; Anopheles; Culex; Hemolymph osmolality; Lethal concentration; Mosquitoes; Osmoregulation; Salinity tolerance.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00585/69744/67634.pdf

Ontogeny of osmoregulation in the Pacific blue shrimp, Litopenaeus stylirostris (decapoda, penaeidae): Deciphering the role of the Na+/K+-ATPase
Provedor de dados: 5
Autores: Pham, Dominique; Charmantier, Guy; Boulo, Viviane; Wabete, Nelly; Ansquer, Dominique; Dauga, Clement; Grousset, Evelyse; Labreuche, Yannick; Charmantier-daures, Mireille.
The role of the main ion transporting enzyme Na +/K + − ATPase in osmoregulation processes was investigated in Litopenaeus stylirostris. The development and localization of the osmoregulation sites were studied during ontogenesis by immunodetection of Na+ K+-ATPase using monoclonal antibodies and transmission electron microscopy (TEM). Osmoregulation sites were identified as the pleurae and branchiostegites in the zoeae and mysis stages. In the subsequent post-metamorphic stages the osmoregulatory function was mainly located in the epipodites and branchiostegites and osmotic regulation was later detected in the gills. The presence of ionocytes and microvilli in these tissues confirmed their role in ionic processes. The complete open reading frame of the...
Tipo: Text
Palavras-chave: Penaeid; Litopenaeus stylirostris; Ontogeny; Osmoregulation; Na+/K+-ATPase; RNA interference.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00311/42176/41477.pdf

Change of osmoregulatory and hematological parameters in tilapia (Oreochromis niloticus) after exposure to sublethal mercury concentrations
Provedor de dados: 5
Autores: Handayani, Kiki Syaputri; Soegianto, Agoes; Lignot, Jehan-hervé.
The effects of Hg exposure on blood parameters and gill physiology of tilapia (Oreochromis niloticus) were analyzed. Fish maintained in freshwater were exposed for 7 days (d) to sublethal mercury concentrations (0.1 and 1 mg/L). Blood serum osmolality (SO), sodium (Na+), potassium (K+) and chloride (Cl−) ionic concentrations, and hematological parameters were assessed after 1 up to 7 d of exposure. Serum osmolality and ionic concentrations of exposed fish appeared differently affected throughout the experimental period compared to the controls. Osmolality was reduced at the 2 tested concentrations but Na+ and Cl− contents were only altered at 1 mg/L of Hg after 1 d of exposure and values rapidly returned to the control values thereafter. K+ content was...
Tipo: Text
Palavras-chave: Mercury; Tilapia; Osmoregulation; Serum ions; Blood; Aquatic toxicology.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00648/76033/76943.pdf

Could a diet enriched with n-3 highly unsaturated fatty acids be considered a promising way to enhance the immune defences and the resistance of Penaeid prawns to environmental stress?
Provedor de dados: 5
Autores: Chim, Liet; Lemaire, Pierrette; Delaporte, Maryse; Le Moullac, Gilles; Galois, Robert; Martin, Jean-louis.
The prawn Penaeus stylirostris (Stimpson), when fed for 28 days with n-3 highly unsaturated fatty acid (HUFA)-enriched feed pellets, demonstrated an enhanced resistance to variations in environmental parameters (a decrease in temperature and salinity over a 4-day period from 28 degreesC to 17 degreesC and from 35 parts per thousand to 10 parts per thousand respectively) and an improvement in their immune defence potential, i.e. increased agglutination titre of plasma and increased respiratory burst of haemocytes.
Tipo: Text
Palavras-chave: Immunostimulation; Osmoregulation; Environment; Stress; Essential fatty acids; Crustaceans.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-606.pdf

A transcriptomic approach of salinity response in the euryhaline teleost, Dicentrarchus labrax
Provedor de dados: 5
Autores: Boutet, Isabelle; Ky, Chin Long; Bonhomme, Francois.
Euryhaline teleosts possess the capacity to osmoregulate under various environmental conditions (freshwater to hypersaline water). This physiological capacity is generally monitored using enzyme activity assays (Na+/K+-ATPase...), hormones quantification (prolactine, growth hormone) or their mRNAs expression. To date, few studies addressed the genetic correlates of adaptation to varying salinity at a molecular level in such fish. In the sea bass Dicentrarchus labrax, genetic differentiation was observed at specific allozyme loci between lagoon- and open-sea populations. In the present study, we investigated transcriptomic response of D. labrax to salt- and freshwater acclimation in two organs involved in osmoregulation, gill and intestine. By using...
Tipo: Text
Palavras-chave: Suppression subtractive hybridisation; Carbonic anhydrase; Osmoregulation; MRNA expression; Sea bass.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1901.pdf

Description of the unusual digestive tract of   Platax orbicularis   and the potential impact of   Tenacibaculum maritimum   infection
Provedor de dados: 5
Autores: Alix, Maud; Gasset, Eric; Bardon-albaret, Agnes; Noel, Jean; Pirot, Nelly; Perez, Valérie; Coves, Denis; Saulnier, Denis; Lignot, Jehan-hervé; Cucchi, Patricia N.
Background Ephippidae fish are characterized by a discoid shape with a very small visceral cavity. Among them Platax orbicularis has a high economic potential due to its flesh quality and flesh to carcass ratio. Nonetheless, the development of its aquaculture is limited by high mortality rates, especially due to Tenacibaculum maritimum infection, occurring one to three weeks after the transfer of fishes from bio-secure land-based aquaculture system to the lagoon cages for growth. Among the lines of defense against this microbial infection, the gastrointestinal tract (GIT) is less studied. The knowledge about the morphofunctional anatomy of this organ in P. orbicularis is still scarce. Therefore, the aims of this study are to characterize the GIT in...
Tipo: Text
Palavras-chave: Digestive system; Tenacibaculosis; Mucous; Osmoregulation; Absorption; Batfish; Teleost.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76421/77485.pdf

Inter-individual variability in freshwater tolerance is related to transcript level differences in gill and posterior kidney of European sea bass
Provedor de dados: 5
Autores: L'Honoré, Thibault; Farcy, Emilie; Blondeau-bidet, Eva; Lorin-nebel, Catherine.
Acclimation to low salinities is a vital physiological challenge for euryhaline fish as the European sea bass Dicentrarchus labrax. This species undertakes seasonal migrations towards lagoons and estuaries where a wide range of salinity variations occur along the year. We have previously reported intraspecific differences in freshwater tolerance, with an average 30% mortality rate. In this study, we bring new evidence of mechanisms underlying freshwater tolerance in sea bass at gill and kidney levels. In fresh water (FW), intraspecific differences in mRNA expression levels of several ion transporters and prolactin receptors were measured. We showed that the branchial Cl-/HCO3- anion transporter (slc26a6c) was over-expressed in freshwater intolerant fish,...
Tipo: Text
Palavras-chave: Intraspecific variation; Osmoregulation; Freshwater acclimation; Ion transporters; SLC26A6; NKCC; PRLR.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00614/72569/71524.pdf

Ion uptake pathways in European sea bass Dicentrarchus labrax
Provedor de dados: 5
Autores: Blondeau-bidet, Eva; Hiroi, Junya; Lorin-nebel, Catherine.
Ion uptake mechanisms are diverse in fish species, certainly linked to duplication events that have led to the presence of a multitude of paralogous genes. In fish, Na+ uptake involves several ion transporters expressed in different ionocyte subtypes. In the European sea bass Dicentrarchus labrax, several key transporters potentially involved in Na+ uptake have been investigated in seawater (SW) and following a 2 weeks freshwater (FW) acclimation. Using gel electrophoresis, we have shown that the Na+/H+-exchanger 3 (nhe3, slc9a3) is expressed in gills and kidney at both salinities. Quantitative realtime PCR analysis showed a significantly higher nhe3 expression in fresh water (FW) compared to SW. Its apical localization in a subset of gill ionocytes in...
Tipo: Text
Palavras-chave: Teleost; Osmoregulation; Ion transporters; Na+ uptake; NHE3; NCC2.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00485/59618/62638.pdf

Molecular characterisation of prolactin and analysis of extrapituitary expression in the European sea bass Dicentrarchus labrax under various salinity conditions
Provedor de dados: 5
Autores: Boutet, Isabelle; Lorin Nebel, C; De Lorgeril, Julien; Guinand, B.
dAlthough prolactin has been demonstrated to be the main hormone involved in adaptation to dilute media in several freshwater teleosts, few studies have been conducted in marine teleosts. In the Mediterranean, the sea bass Dicentrarchus labrax inhabits environments ranging from the open sea to coastal lagoons, where salinity varies greatly. We characterised the prolactin (prl) gene and analysed its expression in two organs (gill and intestine) in D. labrax acclimated to either freshwater or seawater. A 2819 bp long sequence encompassing the prl gene and a part (282 bp) of the promoter were identified, and these comprised 5 coding exons separated by 4 introns. Prolactin was similarly expressed in fresh- and seawater adapted fish, although expression in...
Tipo: Text
Palavras-chave: Prolactin; Phylogenctic analysis; MRNA expression; Osmoregulation; Intestine; Gill; Dicentrarchuslabrax.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2537.pdf

Response of the blue shrimp Litopenaeus stylirostris to temperature decrease and hypoxia in relation to molt stage
Provedor de dados: 5
Autores: Mugnier, Chantal; Soyez, Claude.
The effect of different levels of dissolved oxygen (DO) and a decreased temperature combined with severe hypoxia were studied in the blue shrimp Litopenaeus stylirostris in relation to molt stage. In the first experiment, shrimps were submitted to DO concentrations of 5 to 1 mg l(-1). Osmoregulatory capacity (OC) was measured in shrimps at molt stage C after 6, 24, or 48 h of exposure. No mortality was recorded but a significant negative effect of DO concentration on hypo-OC was observed for DO concentrations below 3 mg l(-1). Osmoregulation improved after 48 h exposure, compared to 6 and 24 h exposure.   In a second experiment, temperature was decreased from 28 to 22 degreesC in 24 h, before a severe hypoxia of 0.5+/-0.1 mg O-2 l(-1) was applied....
Tipo: Text
Palavras-chave: Temperature; Stress; Penaeid shrimp; Osmoregulation; Molt stage; Litopenaeus stylirostris; Hypoxia.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-372.pdf

The ClC-3 chloride channel and osmoregulation in the European Sea Bass, Dicentrarchus labrax
Provedor de dados: 5
Autores: Bossus, Maryline; Charmantier, Guy; Blondeau-bidet, Eva; Valletta, Bianca; Boulo, Viviane; Lorin-nebel, Catherine.
Dicentrarchus labrax migrates between sea (SW), brackish and fresh water (FW) where chloride concentrations and requirements for chloride handling change: in FW, fish absorb chloride and restrict renal losses; in SW, they excrete chloride. In this study, the expression and localization of ClC-3 and Na+/K+-ATPase (NKA) were studied in fish adapted to SW, or exposed to FW from 10 min to 30 days. In gills, NKA-alpha 1 subunit expression transiently increased from 10 min and reached a stabilized intermediate expression level after 24 h in FW. ClC-3 co-localized with NKA in the basolateral membrane of mitochondria-rich cells (MRCs) at all conditions. The intensity of MRC ClC-3 immunostaining was significantly higher (by 50 %) 1 h after the transfer to FW,...
Tipo: Text
Palavras-chave: ClC-3 chloride channel; Na+/K+-ATPase; Dicentrarchus labrax; Osmoregulation; Osmosensing.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00149/26044/25185.pdf

Adaptations biochimiques intestinales chez la truite: Influence de l'aliment et de la salinite sur quelques proprietes membranaires
Provedor de dados: 5
Autores: Leray, C.
The authors report the results of physiological and biochemical experiments which confirm the important role player by fish (Salmo gairdneri ) intestinal mucosa in their osmoregulatory process. The ability of the dietary lipids to modulate this function is described. It was demonstrated that the ionic apical permeability of the enterocytes are related to their membrane lipid composition. The importance of the essential fatty acids is emphasized. The time course changes of the apical permeability are of value in improving sea water adaptation, similar conclusions are reported for Nacl supplementation.
Tipo: Text
Palavras-chave: Salmonidae; Pisces; Biological membranes; Fatty acids; Diets; Osmotic adaptations; Biochemical phenomena; Intestines; Lipids; Nutrition; Salinity effects; Euryhalinity; Osmoregulation.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1249.pdf

Wastewater bioremediation by mangrove ecosystems impacts crab ecophysiology: in-situ caging experiment
Provedor de dados: 5
Autores: Theuerkauff, Dimitri; Rivera-ingraham, Georgina A.; Lambert, Sophia; Mercky, Yann; Lejeune, Mathilde; Lignot, Jehan-hervé; Sucré, Elliott.
Mangroves are tidal wetlands that are often under strong anthropogenic pressures, despite the numerous ecosystem services they provide. Pollution from urban runoffs is one such threats, yet some mangroves are used as a bioremediation tool for wastewater (WW) treatment. This practice can impact mangrove crabs, which are key engineer species of the ecosystem. Using an experimental area with controlled WW releases, this study aimed to determine from an ecological and ecotoxicological perspective, the effects of WW on the red mangrove crab Neosarmatium africanum. Burrow density and salinity levels (used as a proxy of WW dispersion) were recorded, and a 3-week caging experiment was performed. Hemolymph osmolality, gill Na+/K+-ATPase (NKA) activity and gill...
Tipo: Text
Palavras-chave: Mangrove; Bioturbation; Wastewater; Ecophysiology; Oxidative stress; Osmoregulation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00592/70449/68559.pdf

Osmoregulation and salinity-induced oxidative stress: is oxidative adaptation determined by gill function?
Provedor de dados: 5
Autores: Rivera-ingraham, Georgina A.; Barri, Kiam; Boel, Melanie; Farcy, Emilie; Charles, Anne-laure; Geny, Bernard; Lignot, Jehan-herve.
Osmoregulating decapods such as the Mediterranean green crab Carcinus aestuarii possess two groups of spatially segregated gills: anterior gills serve mainly respiratory purposes, while posterior gills contain osmoregulatory structures. The co-existence of similar tissues serving different functions allows the study of differential adaptation, in terms of free radical metabolism, upon salinity change. Crabs were immersed for 2 weeks in seawater (SW, 37 ppt), diluted SW (dSW, 10 ppt) and concentrated SW (cSW, 45 ppt). Exposure to dSW was the most challenging condition, elevating respiration rates of whole animals and free radical formation in hemolymph (assessed fluorometrically using C-H(2)DFFDA). Further analyses considered anterior and posterior gills...
Tipo: Text
Palavras-chave: Antioxidant defense; Carcinus aestuarii; ROS production; Osmoregulation.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00626/73816/74410.pdf

The Na+/K+/2Cl(-) cotransporter in the sea bass Dicentrarchus labrax during ontogeny: involvement in osmoregulation
Provedor de dados: 5
Autores: Lorin, N; Boulo, Viviane; Bodinier, C; Charmantier, G.
This study combines a cellular and molecular analysis of the Na+/K+/2Cl(-) cotransporter (NKCC) to determine the osmoregulatory role of this protein in different tissues during the ontogeny of the sea bass. We have characterized the complete sequence of the NKCC1 isoform isolated from the sea bass gills and have identified, by immunofluorescence, NKCC1, and other isoforms, within the epithelium of the major osmoregulatory organs. Different (absorptive and secretory) functions have been attributed to this protein according to the tissue and salinity. The effects of short- (1-4 days), medium- (7-21 days) and long (6 months)-term freshwater (FW) adaptations were investigated, in comparison with seawater (SW)-maintained sea bass. In adult sea bass after...
Tipo: Text
Palavras-chave: Quantitative expression; Immunofluorescence; Osmoregulation; Ontogeny; Dicentrarchus labrax; Na+/K+/2Cl( ) cotransporter.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3531.pdf

Salinity stress from the perspective of the energy-redox axis: Lessons from a marine intertidal flatworm
Provedor de dados: 5
Autores: Rivera-ingraham, Georgina A.; Nommick, Aude; Blondeau-bidet, Eva; Ladurner, Peter; Lignot, Jehan-herve.
In the context of global change, there is an urgent need for researchers in conservation physiology to understand the physiological mechanisms leading to the acquisition of stress acclimation phenotypes. Intertidal organisms continuously cope with drastic changes in their environmental conditions, making them outstanding models for the study of physiological acclimation. As the implementation of such processes usually comes at a high bioenergetic cost, a mitochondrial/oxidative stress approach emerges as the most relevant approach when seeking to analyze whole-animal responses. Here we use the intertidal flatworm Macrostomum lignano to analyze the bioenergetics of salinity acclimation and its consequences in terms of reactive oxygen/nitrogen species...
Tipo: Text
Palavras-chave: Energetic balance; Flatworms; Live-imaging; Mitochondrial membrane potential; Osmoregulation; RNS; ROS.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00625/73743/74411.pdf

Digestive tract ontogeny of Dicentrarchus labrax: Implication in osmoregulation
Provedor de dados: 5
Autores: Giffard, I; Charmantier, G; Grousset, E; Aujoulat, F; Castille, R.
The ontogeny of the digestive tract (DT) and of Na+/K+-ATPase localization was investigated during the early postembryonic development (from yolk sac larva to juvenile) of the euryhaline teleost Dicentrarchus labrax reared at two salinities: seawater and diluted seawater. Histology, electron microscopy and immunocytochemistry were used to determine the presence and differentiation of ion transporting cells. At hatching, the DT is an undifferentiated straight tube over the yolk sac. At the mouth opening (day 5), it comprises six segments: buccopharynx, esophagus, stomach, anterior intestine, posterior intestine and rectum, well differentiated at the juvenile stage (day 72). The enterocytes displayed ultrastructural features similar to those of...
Tipo: Text
Palavras-chave: Osmoregulation; Na+/K+ ATPase; Immunolocalization; Fish larva; Enteric ionocyte.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-4653.pdf

Acclimation of juvenile Mugil liza Valenciennes, 1836 (Mugiliformes: Mugilidae) to different environmental salinities
Provedor de dados: 83
Autores: Lisboa,Viviana; Barcarolli,Indianara F.; Sampaio,Luís A.; Bianchini,Adalto.
Survival and physiological parameters associated with metabolism and osmoregulation were evaluated in juveniles of the Lebranche mullet Mugil liza acclimated to different water salinities (5, 10, 20, 30, and 40‰) for 15 days. Room temperature (25ºC) and photoperiod (12L:12D) were fixed. Fish were fed twice-a-day with commercial diet (28% crude protein) until satiation. After acclimation, whole body oxygen consumption was measured and fish were euthanized and sampled for blood, gills, and liver. Whole body oxygen consumption and plasma osmolality did not change in the range of salinities tested. The isosmotic point was estimated as 412.7 mOsmol kg-1 (13.5‰). Gill Na+,K+-ATPase activity tended to be lower at 20 and 30‰, while liver glycogen content was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Glycogen; Na+; K+-ATPase; Osmoregulation; Oxygen consumption.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000300591

Metabolic substrates are not mobilized from the osmoregulatory organs (gills and kidney) of the estuarine pufferfishes Sphoeroides greeleyi and S. testudineus upon short-term salinity reduction
Provedor de dados: 83
Autores: Prodocimo,Viviane; Souza,Carine F.; Pessini,Cristina; Fernandes,Luiz Claudio; Freire,Carolina A.
The marine-estuarine species of pufferfishes Sphoeroides testudineus and S. greeleyi are very efficient osmoregulators. However, they differ with respect to their tolerance of salinity reduction. During low tide S. testudineus remains in diluted estuarine waters, whereas S. greeleyi returns to seawater (SW). The hypothesis tested here was that the short-term mobilization of metabolic substrates stored in their main osmoregulatory organs would correlate with this differential tolerance. Fishes exposed to 5‰ (for 6 h) were compared to those kept in 35‰. Branchial and renal contents of triglycerides, protein and glycogen were evaluated, and total ATPase activity accounted for the tissues' metabolism. Plasma osmolality, chloride and glucose, hematocrit, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish gill; Fish kidney; Glycogen; Metabolism; Osmoregulation; Tetraodontidae.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400009

Physiological effects of gasoline on the freshwater fish Prochilodus lineatus(Characiformes: Prochilodontidae)
Provedor de dados: 83
Autores: Simonato,Juliana D.; Fernandes,Marisa N.; Martinez,Cláudia B. R.
The purpose of this work was to evaluate the effects of the water-soluble fraction of gasoline (WSFG) on the Neotropical freshwater fish Prochilodus lineatus. The WSFG was prepared by mixing gasoline in water (1:4) and animals were exposed for 6, 24 and 96h to 5% diluted WSFG or only to water. After exposure, blood was collected from the caudal vein and the gills were removed. The following parameters were analyzed: hematological (hemoglobin, hematocrit, number of red blood cells), osmo-ionic (plasma Na+, Cl- and K+ and plasma osmolarity), metabolic (total plasma proteins and glucose), endocrine (cortisol), density and distribution of chloride cells [CC] in the gills (immunohistochemistry), and branchial Na+/K+-ATPase (NKA) activity. Hemolysis was found to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chloride cells; Hematology; Hydrocarbons; Na+K+-ATPase; Osmoregulation; Stress response.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300683

Plasma ion levels of freshwater and marine/estuarine teleosts from Southern Brazil
Provedor de dados: 83
Autores: Becker,Alexssandro Geferson; Gonçalves,Jamile Fabbrin; Toledo,Jaderson dos Anjos; Burns,Marcelo D. M.; Garcia,Luciano de Oliveira; Vieira,João Paes; Baldisserotto,Bernardo.
The purpose of this study was to investigate Na+, Cl-, K+, Ca2+, and Mg2+ levels in the plasma of freshwater and marine/estuarine teleosts collected at different salinities (0 to 34) from the estuarine and freshwater portions of the São Gonçalo channel in Southern Brazil. Any relationship between plasma ion levels and salinity and the capacity of ionic regulation of teleosts found at three or more different salinities (Genidens barbus and Micropogonias furnieri) was also investigated. Results showed no relationship between plasma ion levels and salinity when considering all species together, but the two species collected from three or more different salinities showed a significant positive relationship between plasma ion levels and salinity, indicating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ariidae; Estuaries; Ionoregulation; Osmoregulation; Salinity; Sciaenidae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400021

Ion fluxes in silver catfish (Rhamdia quelen) juveniles exposed to different dissolved oxygen levels
Provedor de dados: 83
Autores: Rosso,Felipe Link de; Bolner,Keidi C. S.; Baldisserotto,Bernardo.
Low dissolved oxygen levels in the water (hypoxia) can be provoked by oxygen consumption by fish and other organisms, organic matter decomposition, phytoplankton blooms, and temperature increase. The objective of the present study was to investigate Na+, Cl-, K+, and ammonia fluxes in silver catfish (Rhamdia quelen) exposed to different dissolved oxygen levels. Juveniles (9 ± 1g) maintained at 6.0 mg.L-1 dissolved oxygen were transferred to four 40 L aquaria with different dissolved oxygen levels (in mg.L-1): 6.0, 4.5, 3.5, and 2.5. In another series of experiments, juveniles were acclimated at 6.0 or 2.5 mg.L-1 dissolved oxygen levels, and then placed in two 40 L aquaria with 6.0 mg.L-1 dissolved oxygen. For both series of experiments, 1, 24, 48 or 120 h...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxygen saturation; Osmoregulation; Jundiá.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400007

The effects of low salinity on lipid composition in the gills of grey mullet "Liza ramada"
Provedor de dados: 20
Autores: Rabeh, I.; Telahigue, K.; Chetoui, I.; Masmoudi, W.; El Cafsi, M.
Les alevins de Liza ramada  adaptés à l’eau de mer (EM, 35ppt) ont subi au laboratoire un stress  halin  par transfert direct de l’eau de mer à l’eau douce (ED, 0,5 ppt) pendant 24 heures. Les aspects hématologiques ainsi que la composition lipidique du tissu branchial des alevins ont été suivis. Le transfert à la basse salinité s’est accompagné d’une diminution significative de l’osmolalité du plasma, du taux d’hématocrite et du nombre des globules rouges.  Le suivi de l’évolution des lipides des branchies des alevins en fonction de la salinité du milieu, montre  une augmentation des acides gras monoinsaturés, particulièrement l’acide oleique  C18 :1(n-9) à la basse salinité.  Une réduction des pourcentages des acides gras polyinsaturés  de la famille...
Tipo: Journal Contribution
Palavras-chave: Osmoregulation; Mullet fisheries; Osmotic adaptations.
Ano: 2010
URL: http://hdl.handle.net/1834/4701

Physiological responses of two ecologically important Kenyan mangrove crabs exposed to altered salinity regimes
Provedor de dados: 20
Autores: De Wachter, B.; Gillikin, D.P.; Tack, J.
The potential long-term effects of altered salinity regimes on the bioenergetics of two ecologically important Kenyan mangrove crabs, Neosarmatium meinerti de Man, 1887 and Neosarmatium smithi H. Milne Edwards, 1853 were investigated in light of recent findings suggesting that groundwater redirection may alter salinity regimes in Kenyan mangroves. Although changes in groundwater may cause only small increases in salinities, these changes would be chronic and may impact crab populations already living above their optimal salinity. To assess potential impacts, fundamental physiological processes and hemolymph components were measured on animals acclimated to 16‰, 32‰, 48‰ and 65‰ for 4 weeks in a field laboratory. For comparative purposes, crabs were also...
Tipo: Journal Contribution
Palavras-chave: Ecophysiology; Salinity Tolerance; Energy Budget; Osmoregulation; Sesarmidae; Crab fisheries.
Ano: 2004
URL: http://hdl.handle.net/1834/693

Salt concentrations in culture media for the development of Dipteryx alata in vitro
Provedor de dados: 86
Autores: Araruna,Elequisandra da Costa; Ribeiro-Oliveira,João Paulo; Pereira,Vanderley José; Asmar,Simone Abreu; Melo,Berildo de.
Abstract: The objective of this work was to evaluate how salt concentrations in media used for in vitro cultures affect the early development of “barueiro” (Dipteryx alata) seedlings obtained from the shoot apex. Two different in vitro culture media - Murashige &amp; Skoog (MS) and wood plant medium (WPM) - in different salt concentrations (25, 50, 75, and 100%) were used. At 120 days, the D. alata seedlings in the MS medium, in its original concentration (100%), developed better than in other concentrations or in the WPM. Therefore, the MS medium was considered the most suitable for ensuring in vitro establishment because it provided greater root length (27.65 cm) and number of leaves per plant (26 leaves) than the other medium.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado biome; Culture media; Osmoregulation; Plant growth; Salt concentrations; Tissue culture.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201295

An economic evaluation of the osmoregulation gene technology to the Australian wheat industry
Provedor de dados: 31
Autores: Farquharson,   Robert J.; Morgan,   J.M.; Brennan,   John P.
Episodes of rainfall irregularity and soil moisture deficit have focused attention on the widespread limitation of water supply on winter cereal crop production in Australia. This has motivated a number of efforts at breeding for improved drought tolerance. A recent example involves a cellular adaptation which mitigates water loss through solute accumulation (osmoregulation or osmotic adjustment). An assessment of the performance of osmoregulation yield response in the presence of climate change found that wheat cultivars with this gene are unlikely to be adversely affected by hotter and drier conditions across the wheat belt. The results of an economic evaluation of potential future innovations (wheat cultivars) from the osmoregulation gene technology are...
Tipo: Conference Paper or Presentation
Palavras-chave: Economic evaluation; Wheat breeding; Osmoregulation; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/58446

Growth and production components of West Indian cherry cultivated with saline waters and potassium fertilization
Provedor de dados: 91
Autores: Lima,Geovani S. de; Pinheiro,Francisco W. A.; Dias,Adaan S.; Gheyi,Hans R.; Soares,Lauriane A. dos A.; Silva,Saulo S. da.
ABSTRACT Due to water limitations in terms of both quantity and quality in the semi-arid region of northeastern Brazil, the use of waters with high concentrations of salts become necessary in irrigated agriculture. Thus, this study aimed to evaluate the growth and production of grafted West Indian cherry under saline water irrigation and potassium fertilization. The experiment was carried out in drainage lysimeters under protected environment conditions, using a Regolithic Neosol with sandy loam texture. Treatments resulted from the combination of two levels of electrical conductivity - ECw (0.8 and 3.8 dS m-1) of irrigation water and four doses of potassium (50, 75, 100 and 125% of the recommendation of Musser), arranged in a randomized block design, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malpighia emarginata; Salt stress; Osmoregulation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000400250

Proline and trehalose in maize seeds germinating under low osmotic potentials
Provedor de dados: 91
Autores: Queiroz,Rafaela J. B.; Cazetta,Jairo O.
ABSTRACT Although it is relatively well known that adult plants tend to accumulate proline and trehalose in their tissues as a physiological mechanism in response to drought, there is scarce information about the development of this physiological response in seeds. Thus, the objective of this research was to verify if maize seeds are able to develop mechanism of osmoprotection, when are germinating under low osmotic potential, and the possibility to use the levels of trehalose and proline in a defined seed part, aiming to differentiate genotypes regarding drought tolerance. The experiment was performed as a factorial arrangement of 2 x 5 (2 hybrids x 5 osmotic potential) within a completely randomized design, with four replicates. It was found that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Germination; Water restriction; Osmoregulation; Compatible solutes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100022

Oxygen consumption remains stable while ammonia excretion is reduced upon short time exposure to high salinity in Macrobrachium acanthurus (Caridae: Palaemonidae), a recent freshwater colonizer
Provedor de dados: 103
Autores: Freire,Carolina A.; Rios,Leonardo de P.; Giareta,Eloísa P.; Castellano,Giovanna C.
ABSTRACT Palaemonid shrimps occur in the tropical and temperate regions of South America and the Indo-Pacific, in brackish/freshwater habitats, and marine coastal areas. They form a clade that recently (i.e., ~30 mya) invaded freshwater, and one included genus, Macrobrachium Bate, 1868, is especially successful in limnic habitats. Adult Macrobrachium acanthurus (Wiegmann, 1836) dwell in coastal freshwaters, have diadromous habit, and need brackish water to develop. Thus, they are widely recognized as euryhaline. Here we test how this species responds to a short-term exposure to increased salinity. We hypothesized that abrupt exposure to high salinity would result in reduced gill ventilation/perfusion and decreased oxygen consumption. Shrimps were subjected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Lactate; Osmoregulation; Palaemonidae.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100323

Water economy of three Cinclodes (Furnariidae) species inhabiting marine and freshwater ecosystems
Provedor de dados: 97
Autores: SABAT,PABLO; NESPOLO,ROBERTO F; BOZINOVIC,FRANCISCO.
Birds living in desert environments have been the preferred models for the study of physiological adaptations to water scarcity. Passerine birds living in marine coastal habitats face similar problems, yet physiological adaptations to water conservation in such species have been poorly documented. We measured total evaporative water loss (TEWL) and rates of oxygen consumption (VO2) in three species of passerine birds dwelling in marine and fresh water habitats. Mass specific total evaporative water loss was significantly lower in the marine species, Cinclodes nigrofumosus, than in species inhabiting areas near freshwater sources. We found a positive relationship between TEWL and VO2. The ratio of TEWL to VO2 (relative evaporative water loss, RTEWL) showed...
Tipo: Journal article
Palavras-chave: Evaporative water loss; Cinclodes; Osmoregulation; Passerines; Salt.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200001

Terrestrial birds living on marine environments: does dietary composition of Cinclodes nigrofumosus (Passeriformes: Furnariidae) predict their osmotic load?
Provedor de dados: 97
Autores: SABAT,PABLO; FARIÑA,JOSÉ M.; SOTO-GAMBOA,MAURICIO.
Feeding on saline marine foods may be especially challenging for passerine birds that lack functional salt glands and have a limited ability to concentrate urine. To reduce the salt load imposed by consumption of marine food these birds may select food with low salt contents and/or increase their intake of freshwater. The genus Cinclodes is particular among passerines because it includes species that inhabit both inland and maritime shores. We analyzed the diet of Cinclodes nigrofumosus and explored the possible relationships between dietary composition and salt load at mesic and arid coastal sites of Chile. From a biogeographical perspective, we hypothesized that freshwater availability is critical to the relationship between diet composition and osmotic...
Tipo: Journal article
Palavras-chave: Cinclodes; Dietary habits; Osmoregulation; Osmotic load.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200017

Osmoregulatory responses to dietary protein and water intake in the granivorous Zonotrichia capensis (Passerine, Emberizidae)
Provedor de dados: 97
Autores: ALDEA,PATRICIA; SABAT,PABLO.
We studied the osmoregulatory responses of the granivore Zonotrichia capensis, acclimated to high- and low-protein diets as well as two levels of water intake. We tested whether Z. capensis has the ability to modify the proportion of nitrogenous waste in the excreta when protein intake and water intake varies. After 21 days of acclimation, plasma osmolality was not significantly affected by dietary treatment; however, excreta osmolality was higher in the high-protein group compared to the low-protein group. Nitrogenous wastes in Z. capensis are excreted mainly in the form of uric acid. The proportion of kidney devoted to medullary tissue was 40 % higher in dehydrated birds than in hydrated birds. Excreta osmolality was higher in dehydrated birds, and in...
Tipo: Journal article
Palavras-chave: Granivory; Kidney; Nitrogenous waste; Osmoregulation; Passerines.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400006

Seasonal changes in the use of marine food resources by Cinclodes nigrofumosus (furnariidae, aves): carbon isotopes and osmoregulatory physiology
Provedor de dados: 97
Autores: SABAT,PABLO; MARTÍNEZ DEL RÍO,CARLOS.
Passerines lack functional salt glands and to a large extent avoid feeding on marine invertebrates. An exception is Cinclodes nigrofumosus. Previous studies reported that the contents of its gastrointestinal tract had a lower osmolality than seawater suggesting that birds were supplementing their marine invertebrate diet with terrestrial invertebrates and fresh water at certain periods of the year. We report seasonal changes in the diet of C. nigrofumosus at two contrasting coastal localities in Central Chile and document the potential correlation between weather and feeding habits with osmoregulatory features in this species. We expected that C. nigrofumosus would increase its use of osmotically challenging marine dietary sources when fresh water is...
Tipo: Journal article
Palavras-chave: Cinclodes; Isotopes; Renal function; Osmoregulation; Seasonal changes.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200009

Evaporative water loss and dehydration during the night in hummingbirds
Provedor de dados: 97
Autores: HARTMAN BAKKEN,BRADLEY; SABAT,PABLO.
Nectar-feeding birds oscillate between avoiding overhydration when they are feeding and preventing dehydration during fasts. Here, we examined how resting rates of total evaporative water loss (TEWL) and metabolic water production (MWP) influence water balance in the green-backed firecrown (Sephanoides sephanoides), a Chilean hummingbird. We hypothesized that a circadian rhythm in TEWL would assuage the dehydration risk that hummingbirds face during the night. However, we did not find support for this idea. In resting hummingbirds, rates of TEWL during the day (54 ±6 µLh-1,n = 8) and night (65 ± 12 h-1, n = 5) were similar. Rates of MWP were also similar between the day (22 ±3 µL h-1, n = 8) and night (23 ± 2 µL h-1, n = 5). MWP rates were significantly...
Tipo: Journal article
Palavras-chave: Circadian rhythm; Evaporative water loss; Hummingbird; Osmoregulation; Water balance.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300001

Accumulation of organic and inorganic solutes in NaCl-stressed sorghum seedlings from aged and primed seeds
Provedor de dados: 63
Autores: Oliveira,Alexandre Bosco de; Alencar,Nara Lídia Mendes; Prisco,José Tarquinio; Gomes-Filho,Enéas.
Although it has been known that the seed's physiological potential affects its response to osmoconditioning and abiotic stresses, researches involving seed aging and priming associated to abiotic stresses are scarce. The aim of this work was to evaluate the role of seed priming on salt tolerance in sorghum seedlings from seeds with two vigor levels (aged or non-aged) and to verify the organic and inorganic solute contributions as osmoregulators in NaCl-stressed seedlings from aged and primed seeds. The combinations of two seed vigor levels (aged or not), two seed types (primed or not) and two salinity levels (exposed to NaCl at 100 mM or not) were evaluated. In low physiological quality seeds (aged seeds), priming provided an attenuation of salinity's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor; Accelerated aging; Priming; Salinity; Osmoregulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600004

IMPROVING THE TOLERANCE OF Vicia faba AGAINST ENVIRONMENTAL SALINITY RESULTED FROM THE IRRIGATION WITH SEA WATER BY USING KNO3 AND (NH4)2SO4 AS CHEMICAL OSMOREGULATORS
Provedor de dados: 37
Autores: MOHAMED,KAMEL.
The familiar solutes, Na+, K+, Ca2+, Mg2+, Cl-, PO4(3-), SO4(2-), soluble carbohydrates, amino acids and soluble proteins, which play a role in osmotic adjustment were estimated to investigate the role of potassium nitrate and ammonium sulphate as osmoregulators and their effects on the solutes composition. Vicia faba L. was cultivated and irrigated with 5, 10, 15 and 20 % (v:v) sea water. The plants were divided to three groups. The first was irrigated with sea water only. The second was treated with 5 mM KNO3 while the third was treated with 5mM (NH4)2SO4. The plants were left to grow until flowering stage. The results indicated that the non treated group increased the soluble carbohydrates in the roots to avoid the influx of sodium. The treatment with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Osmoregulation; Irrigation; Salinity; Sea water; Vicia faba.
Ano: 2012
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000200006

The significance of cortisol on acclimation to salinity in pejerrey Odontesthes bonariensis
Provedor de dados: 45
Autores: Tsuzuki,M.Y.; Ogawa,K.; Strüssmann,C.A.; Maita,M.; Takashima,F.; Melo,C.M.R.
The role of cortisol on the osmoregulation of pejerrey Odontesthes bonariensis at different salinities was investigated in adult fish injected with 0.7mg hydrocortisone per 100g body weight of fish, and transferred to 0, 5 and 20ppt of NaCl. Blood cortisol was 566ng/ml at the beginning of the experiment (0h) but surged to 1250ng/ml within 3h in cortisol-injected fish. Cortisol levels were influenced not only by treatment but also by time, being higher at 3h compared to 24h. Salinity level, time of exposure and their interaction, but not cortisol treatment, significantly affected plasma osmolality and the concentration of ions Cl- and Na+. This study showed that exogenous cortisol does not seem to play a significant role on the regulation of plasma...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pejerrey; Odontesthes bonariensis; Cortisol; Osmoregulation; Salinity.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352007000500030

Activity determination of Na+ K+ - ATPase and Mg++ - ATPase enzymes in the gill of Poecilia vivipara (Osteichthyes, Cyprinodontiformes) in different salinities
Provedor de dados: 52
Autores: Amaral,Marcelo da Cunha; Bonecker,Ana Cristina Teixeira; Ortiz,Cláudio H. D.
This work aimed to know the tolerance mechanisms through the salinity variation by Na+ K+ - ATPase and Mg++ - ATPase and enzymes encountered in the gills of Poecilia vivipara. In field, the presence of this species was observed in salinities of 0 and 28‰. In laboratory, these fish were maintained in aquarium with mean salinity of 30‰ and positive responses were obtained. Some adult specimens, collected in a lagoon of the Coqueiros Beach, were utilized as matrixes. In the experiments the specimens used were those born in the test aquarium. For each salinity studied three replicates were made with three specimens for each one. The alevins were maintained in salinities of 5, 10, 15, 20, 25, 30 and 35‰ during a month for adaptation. Gills were extracted in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poecilia vivipara; Na+ K+ ATPase; Mg++ ATPase; Osmoregulation.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000100001

Effects of salt stress on plant growth, stomatal response and solute accumulation of different maize genotypes
Provedor de dados: 61
Autores: Azevedo Neto,André Dias de; Prisco,José Tarquinio; Enéas-Filho,Joaquim; Lacerda,Claudivan Feitosa de; Silva,José Vieira; Costa,Paulo Henrique Alves da; Gomes-Filho,Enéas.
Seeds from eight different maize genotypes (BR3123, BR5004, BR5011, BR5026, BR5033, CMS50, D766 and ICI8447) were sown in vermiculite, and after germination they were transplanted into nutrient solution or nutrient solution containing 100 mmol.L-1 of NaCl and placed in a greenhouse. During the experimental period plant growth (dry matter, shoot to root dry mass ratio, leaf area, relative growth rate, and net assimilation rate), leaf temperature, stomatal conductance, transpiration, predawn water potential, sodium, potassium, soluble amino acids and soluble carbohydrate contents were determined in both control and salt stressed plants of all genotypes studied. Salt stress reduced plant growth of all genotypes but the genotypes BR5033 and BR5011 were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth analysis; Osmoregulation; Salinity; Transpiration; Zea mays; Water relations.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000100005

Dissolved oxygen and ammonia levels in water that affect plasma ionic content and gallbladder bile in silver catfish
Provedor de dados: 65
Autores: Becker,Alexssandro Geferson; Garcia,Luciano de Oliveira; Kochhann,Daiani; Gonçalves,Jamile Fabbrin; Loro,Vania Lúcia; Baldisserotto,Bernardo.
Ionic contents (Na+, K+ and Cl-) of plasma and gallbladder bile (GB) of juveniles silver catfish, Rhamdia quelen (156.1±0.2g, 28.2±0.3cm), were determined in three different times (0, 6 and 24h) after exposure to: a) control or high dissolved oxygen (DO = 6.5mg L-1) + low NH3 (0.03mg L-1); b) low DO (3.5mg L-1) + low NH3; c) high DO + high NH3 (0.1mg L-1); and d) low DO + high NH3. High waterborne NH3 or low DO levels increased plasma and GB ion levels. These parameters might have followed different mechanisms to affect osmoregulation since a synergic effect of these variables was detected.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen compound; Hypoxia; Ion levels; Jundiá; Osmoregulation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000600020