Consulta: subjectFacets:"Flux"
Registros recuperados: 24
Data/hora: 03/06/2024 07:46:41

Otolith growth in trout Oncorhynchus mykiss: supply of Ca2+ and Sr2+ to the saccular endolymph
Provedor de dados: 5
Autores: Payan, P; Borelli, G; Priouzeau, F; De Pontual, Helene; Boeuf, G; Mayer Gostan, N.
Kinetic and pharmacological characteristics of Ca2+ fluxes across the saccular epithelium of trout were studied using a perfused isolated inner ear. Ca-45(2+) influx from the Ringer solution to the endolymph was 3-4 nmoles h(-1) mu(-1) endolymph, which corresponds to a global turnover rate of the endolymph calcium of 200% h(-1). Ca2+ entry into the proximal endolymph was faster than into the distal fluid. Net Ca2+ movement across the saccular epithelium depended on the direction and intensity of the chemical gradient of calcium between the Ringer solution and the endolymph. Increasing the calcium concentration in the Ringer solution up to 4.4 mmol l(-1) provoked an accumulation of Ca2+ in both proximal and distal endolymphs, and equilibrium was reached...
Tipo: Text
Palavras-chave: Inner ear; Perfusion; Otolith; Endolymph; Flux; Calcium; Oncorhynchus mykiss; Trout.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-416.pdf

Flux et usages de l'eau de mer dans les marais salés endigués Charentais : Cas du marais salé endigué de l'île de Ré
Provedor de dados: 5
Autores: Paticat, Francois.
The aim of the study is to determine how seawater is used in Ré island marine ponds (Charente-Maritime, France). Thus, we assessed the ecosystem functioning, estimated its historical evolution and determined the most suitable ways to improve current management processes. The knowledge of seawater management is essential to ensure wetland future and meet the numerous interests of wetland stakeholders, especially in term of seawater sharing. Consequently, it is necessary to consider the Ré island marine embanked wetland through its natural as well as human characteristics.   Our work followed two research axes. First, a survey and a description of wetland activities were realized through their management types and their water use features, knowing that human...
Tipo: Text
Palavras-chave: Ré Island; Activities; Management; Saltwater; Flows; Coastline; Île de Ré; Activités; Gestion; Eau de mer; Flux; Littoral.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-4518.pdf

Influence d'un élevage ostréicole sur les flux de nutriments et d'oxygène dans un écosystème lagunaire
Provedor de dados: 5
Autores: Mazouni, Nabila; Deslous-paoli, Jean-marc; Landrein, Sonia.
The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The fluxes were maximum in summer and minimum in winter. However, this seasonal pattern was not only linked to the water temperature, as autumn and spring (similar temperatures of about 12 degrees C) were distinct in the second factorial plan (2.3). Oxygen uptake by the oyster cultures varied between 0 mu mol m(-2) h(-1) (January) and 11 823 +/- 377 mu mol m(-2) h(-1) (July). Ammonia and nitrate-nitrites were released into the water column respectively at a rate of...
Tipo: Text
Palavras-chave: Oxygen; Nutrients; Fluxes; Oyster culture; Oxygène; Nutriments; Flux; Elevage ostréicole.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-840.pdf

Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text
Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf

Variabilité hydrologique et biologique du golfe du Lion. I. Transports en azote et productivité potentielle
Provedor de dados: 5
Autores: Conan, P; Pujo-pay, M; Raimbault, P; Leveau, M.
A monthly time-series of the seasonal evolution of the North Mediterranean Current (NMC) and of nitrogen flux across a transect (5 degrees 12'5 E between 43 degrees 10'N and 42 degrees 50'N) at the entrance of the Gulf of Lions was carried out over two years. The NMC exhibited two distinct structures: a winter structure (from November to May) characterised by strong mesoscale and interannual variations in which the current was 20 to 30 km width, about 400 m depth and velocity scaled between 5 and more than 40 cm s(-1); and a summer structure (from May to November) which was less sensitive to mesoscale variations but showing large interannual variability. The current was located more offshore, was wider and shallower than the one in winter and velocity...
Tipo: Text
Palavras-chave: Hydrologie; Variabilité à méso-échelle; Azote; Flux de matière; Bilan; Hydrology; Mesoscale variability; Nitrogen; Flux; Budget.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43638/43249.pdf

Les apports en sels nutritifs dans l'estuaire de la Seine
Provedor de dados: 5
Autores: Guillaud, Jean-francois.
In this report, nutrient concentrations and fluxes are evaluated at the Caudebec station in the Seine estuary; with a mean river flow of 413 m3/s, the values of mean interannual fluxes are 46 300 t per year for silicium, 90 700 t per year for total nitrogen and 11 000 t per year for total phosphorus ; since 1984, there is a decrease of phosphate fluxes (3 % per year) and an increase of total nitrogen fluxes (2 % per year).
Tipo: Text
Palavras-chave: Sels nutritifs; Estuaire Seine; Flux; Nutrients; Seine estuary; Fluxes.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00425/53660/54499.pdf

Recherche de l'origine des sources de contamination microbiologique en rivière de Pénerf. Partie 2, Hiérarchisation des flux et modélisation de la contamination
Provedor de dados: 5
Autores: Treguier, Cathy; Hitier, Benoist.
Dans le cadre de la recherche de l’origine des contaminations en rivière de Penerf, une étude a été menée en partenariat entre l’Ifremer et le SIAGM de juillet 2010 à décembre 2011. Des échantillons d’eau douce aux 8 principaux exutoires, ainsi que des coquillages ont été prélevés à une fréquence bimensuelle afin de dénombrer les indicateurs de contamination fécale Escherichia coli. Le calcul des débits au niveau du bassin versant a permis de reconstituer les flux de bactéries fécales provenant des exutoires étudiés. La contamination des points de prélèvement coquillages situés plus en amont s’avère être supérieure, en moyenne, à la contamination des points REMI situés en aval. Cependant, aucune relation statistique significative n’a pu être mise en...
Tipo: Text
Palavras-chave: Contamination fécale; Escherichia coli; Bassin versant; Pénerf; Flux; Qualité des zones de production conchylicoles; Modélisation.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00140/25174/23280.pdf

The Underwater Vision Profiler 5: An advanced instrument for high spatial resolution studies of particle size spectra and zooplankton
Provedor de dados: 5
Autores: Picheral, Marc; Guidi, Lionel; Stemmann, Lars; Karl, David M.; Iddaoud, Ghizlaine; Gorsky, Gabriel.
The Underwater Vision Profiler (UVP) was developed to quantify the vertical distribution of macroscopic particles and zooplankton &gt; 100 mu m in size. The smaller size limit is fixed by optical resolution, whereas the larger size limit is determined by the volume of water illuminated per image. The new fifth generation instrument (UVP5) is compact (30 kg in air) and operates either as a stand-alone instrument with an independent power supply for use on a mooring or free-drifting array, or as a component of a Conductivity, Temperature, and Depth (CTD)-rosette package. Images are recorded at a frequency up to 6 Hz. If the UVP5 is interfaced with a CTD, these images are acquired and analyzed in real time. Images are recorded every 20 cm at the 1 m s(-1)...
Tipo: Text
Palavras-chave: Video plankton recorder; Marine snow; MU-M; Vertical distribution; Aggregate dynamics; In situ; System; Ocean; Flux; Phytoplankton.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00133/24413/22426.pdf

Etude des apports en herbicides et en nutriments par la Charente : Modélisation de la dispersion de l'atrazine dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Munaron, Dominique.
Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring by modeling a better understanding of the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the Charente river and its estuary reveals that agricultural activity on the catchment area is omnipresent, as well on the level of the nitrogen and herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shellfishfarming activity. Use of a dispersion model will constitute an invaluable help in the risk assessment with respect to...
Tipo: Text
Palavras-chave: Atlantic coast; Marennes Oléron Bay; Modelisation; Estuary; Geochemistry behaviour; Charente River; Flux; Nutrient; Herbicide; Littoral Atlantique; Bassin de Marennes Oléron; Modélisation; Estuaire; Comportement Géochimique; Charente; Flux; Nutriments; Herbicides.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/these-2266.pdf

Fonctionnement écosystémique de la lagune de Biguglia. Partie 2 : Déploiement du modèle écosystémique GAMELag sur la lagune de Biguglia
Provedor de dados: 5
Autores: Pete, Romain; Fiandrino, Annie; Malet, Nathalie.
Afin d’apporter des éléments de réponse quantitatifs à ces questions, un outil numérique GAMELag a été développé en collaboration avec l’UMR ECOSYM en se basant sur l’approche LOICZ. Par suite ce modèle « simple » (modèle en boîtes avec calcul de bilan de matière aux interfaces) a été affiné au cours de phases successives de validation. La présente étude vise à déployer le modèle écosystémique « GAMELag » permettant d’évaluer les flux et stock d’azote et de phosphore dans la lagune de Biguglia. L’objectif est de i) valider le fonctionnement du modèle sur la lagune de Biguglia et ii) de fournir aux gestionnaires des résultats en réponse à différents scenarios hydroclimatiques (année sèche/pluvieuse) ou selon différentes options de gestion, notamment...
Tipo: Text
Palavras-chave: Modèle écosystémique; GAMELag; Flux; Stock; Azote; Phosphore; Scenarios écologiques.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71564/70011.pdf

Validation and analysis of ocean parameters using ASCAT data
Provedor de dados: 5
Autores: Bentamy, Abderrahim; Ardhuin, Fanny; Croize-fillon, Denis; Queffeulou, Pierre.
This project aims to investigate the quality of ASCAT measurements as well as their use for oceanographic purposes. The accuracy of ASCAT retrievals will be mainly based on the use of collocated data from moored buoys, numerical weather prediction models, and satellites. The resulting collocated data will be used to explore the accuracy of the geophysical model function which relates the backscatter coefficients to surface wind vectors, as well as to assess the quality of ASCAT vector winds at global and local scales. Once this objective reached, it will enable to fully utilize the MetOp data for oceanographic applications. They will contribute to evaluate various estimates of ocean surface flux parameters required to force ocean general circulation...
Tipo: Text
Palavras-chave: Fluxes; Sea ice; Wind; Scatterometer; ASCAT; MetOp; Flux; Glaces de mer; Vent; Diffusiomètre; ASCAT; MetOp.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-1272.pdf

Contamination des coquillages par les norovirus en rivière d'Auray (Norocoqauray)
Provedor de dados: 5
Autores: Treguier, Cathy; Schaeffer, Julien; Le Saux, Jean-claude; Cochennec-laureau, Nathalie; Le Guyader, Soizick.
Les norovirus (NoV) sont responsables des épidémies hivernales de gastroentérites aiguës dans la population. Ils sont excrétés dans les fèces humains, puis se retrouvent, après épuration insuffisante, dans le milieu marin naturel où ils peuvent contaminer des coquillages, qui à leur tour risquent de déclencher des gastroentérites chez les consommateurs. Cette étude vise à améliorer les connaissances sur la contamination des coquillages en élevage en rivière d’Auray par les NoV, en lien avec les bactéries témoins de contamination fécale Escherichia coli (E. coli). L’objectif est de suivre les flux de NoV et d’E. coli apportés par différents rejets (dont une station d’épuration) impactant la zone conchylicole et leur influence sur la qualité des coquillages...
Tipo: Text
Palavras-chave: Norovirus; Coquillages; Contamination; Station d’épuration; Flux; Rivière d’Auray; Escherichia coli.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00267/37778/35829.pdf

Overview of the Arctic Sea State and Boundary Layer Physics Program
Provedor de dados: 5
Autores: Thomson, Jim; Ackley, Stephen; Girard-ardhuin, Fanny; Ardhuin, Fabrice; Babanin, Alex; Boutin, Guillaume; Brozena, John; Cheng, Sukun; Collins, Clarence; Doble, Martin; Fairall, Chris; Guest, Peter; Gebhardt, Claus; Gemmrich, Johannes; Graber, Hans C.; Holt, Benjamin; Lehner, Susanne; Lund, Bjorn; Meylan, Michael H.; Maksym, Ted; Montiel, Fabien; Perrie, Will; Persson, Ola; Rainville, Luc; Rogers, W. Erick; Shen, Hui; Shen, Hayley; Squire, Vernon; Stammerjohn, Sharon; Stopa, Justin; Smith, Madison M.; Sutherland, Peter; Wadhams, Peter.
A large collaborative program has studied the coupled air‐ice‐ocean‐wave processes occurring in the Arctic during the autumn ice advance. The program included a field campaign in the western Arctic during the autumn of 2015, with in situ data collection and both aerial and satellite remote sensing. Many of the analyses have focused on using and improving forecast models. Summarizing and synthesizing the results from a series of separate papers, the overall view is of an Arctic shifting to a more seasonal system. The dramatic increase in open water extent and duration in the autumn means that large surface waves and significant surface heat fluxes are now common. When refreezing finally does occur, it is a highly variable process in space and time. Wind and...
Tipo: Text
Palavras-chave: Arctic; Waves; Autumn; Sea ice; Beaufort; Flux.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00437/54837/56313.pdf

Fonctionnement écosystémique de la lagune de Biguglia. Partie 3 : Scénarios écologiques
Provedor de dados: 5
Autores: Pete, Romain; Malet, Nathalie.
Afin d’apporter des éléments de réponse quantitatifs à ces questions, un outil numérique GAMELag a été développé en collaboration avec l’UMR ECOSYM en se basant sur l’approche LOICZ. Par suite ce modèle « simple » (modèle en boîtes avec calcul de bilan de matière aux interfaces) a été affiné au cours de phases successives de validation. La présente étude vise à déployer le modèle écosystémique « GAMELag » permettant d’évaluer les flux et stock d’azote et de phosphore dans la lagune de Biguglia. L’objectif est de i) valider le fonctionnement du modèle sur la lagune de Biguglia et ii) de fournir aux gestionnaires des résultats en réponse à différents scenarios hydroclimatiques (année sèche/pluvieuse) ou selon différentes options de gestion, notamment...
Tipo: Text
Palavras-chave: Modèle écosystémique; GAMELag; Flux; Stock; Azote; Phosphore; Scenarios écologiques.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71565/70025.pdf

Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling
Provedor de dados: 5
Autores: Lafite, Robert; Shimwell, Susan; Grochowski, Nicolas; Dupont, Jacques; Nash, Linda; Salomon, Jean-claude; Cabioch, Louis; Collins, Michael; Gao, Shu.
Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to...
Tipo: Text
Palavras-chave: English Channel; Straits; Transport mechanisms; Flux; Suspended particulate matter; Manche; Détroit; Mécanismes de transport; Flux; Matières en suspension.
Ano: 2000
URL: https://archimer.ifremer.fr/doc/2000/publication-527.pdf

Comportement du cadmium et du mercure lors de la diagenèse précoce et flux à l'interface eau-sédiments en zone littorale
Provedor de dados: 5
Autores: Gonzalez, Jean-louis.
The early diagenesis of Cd and Hg has been studied in different coastal areas (vasière Ouest-Gironde, Pertuis d'Antioche, baie de Marennes-Oléron). For these two metals, the fluxes at the sediment-water interface have been calculated. Considering only molecular diffusion, the diffusionnal fluxes of Cd and Hg to the colurnn water are negligible with regard to both the particular fluxes to the sediments and the inputs of the "Gironde" and "Charente" ·,estuaries. The take into account of the different processes which affect the ex changes at the interface (erosion, bioturbation) permits more realistic an estimation of the role of sediments in the geochemical cycle of Cd and Hg. The results show that up to 50% of particular Cd and Hg which are integrated into...
Tipo: Text
Palavras-chave: Cadmium; Mercure; Eaux intrstitielles; Diagenèse précoce; Flux; Interface eaux-sédiments; Bioturbation; Modélisation; Cadmium; Mercury; Pore waters; Early diagenesis; Fluxes; Sediment-water interface; Bioturbation; Modelling.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00442/55402/56920.pdf

Surface ocean-lower atmosphere study: Scientific synthesis and contribution to Earth system science
Provedor de dados: 5
Autores: Breviere, Emilie H. G.; Bakker, Dorothee C. E.; Bange, Hermann W.; Bates, Timothy S.; Bell, Thomas G.; Boyd, Philip W.; Duce, Robert A.; Garcon, Veronique; Johnson, Martin T.; Law, Cliff S.; Marandino, Christa A.; Olsen, Are; Quack, Birgit; Quinn, Patricia K.; Sabine, Christopher L.; Saltzman, Eric S.
The domain of the surface ocean and lower atmosphere is a complex, highly dynamic component of the Earth system. Better understanding of the physics and biogeochemistry of the air-sea interface and the processes that control the exchange of mass and energy across that boundary define the scope of the Surface Ocean-Lower Atmosphere Study (SOLAS) project. The scientific questions driving SOLAS research, as laid out in the SOLAS Science Plan and Implementation Strategy for the period 2004-2014, are highly challenging, inherently multidisciplinary and broad. During that decade, SOLAS has significantly advanced our knowledge. Discoveries related to the physics of exchange, global trace gas budgets and atmospheric chemistry, the CLAW hypothesis (named after its...
Tipo: Text
Palavras-chave: Ocean; Atmosphere; Processes; Biogeochemistry; Flux; Climate.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00293/40405/38964.pdf

Estuaire Charente: flux à Saint-Savinien et intrusions salines, résultats durant l'étiage 2011
Provedor de dados: 5
Autores: Le Moine, Olivier; Robert, Serge; Geairon, Philippe; Chabirand, Jean-michel.
En réponse aux interrogations et enjeux soulevés par les gestionnaires de l'estuaire de la Charente (EPTB, CG17, AEAG), un projet scientifique partenarial (Ifremer, ULR) a été élaboré pour tenter d'apporter des éléments de réponse souhaités.  Les enjeux sont grossièrement de trois ordres :  * de gestion, à court et moyen terme, du barrage de Saint Savinien, du Port de Rochefort, de la qualité de l'eau potable.  * de connaissances et outils d'aide à la gestion : conditions favorisant l'envasement, continuité écologique, qualité des eaux côtières...  * de connaissances scientifiques : bilans hydriques et sédimentaires, impacts des apports dans les pertuis.  Les attendus pour cette première phase du projet en 2011 sont surtout la connaissance ou évaluation...
Tipo: Text
Palavras-chave: Estuaire Charente; Flux; MES; Intrusions salines; Saint-Savinien; Département Charente-Maritime.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00142/25312/23387.pdf

Comportement géochimique des herbicides et de leurs produits de dégradation en milieu estuarien et marin côtier
Provedor de dados: 5
Autores: Munschy, Catherine.
The presence and geochemical behaviour of herbicides were investigated in estuarine and marine waters of the French coasts (Seine, Charente, Gironde estuaries and Rhône delta). These organic contaminants were quantified by capillary Gas Chromatography (GC) using Nitrogen-Phosphorus Detecter and identified by GCIMS (Mass Spectrometry). A liquid-solid extraction method using XAD-2 resins was developed,  allowing the analysis of both chloro-triazines and their degradation products in the nanogram per litre (ng.l-1) detection range. Different types of chemicals were identified in the estuarine and coastal waters: triazine, amide and acetanilide herbicides. These compounds are mainly present in the water phase, with less than 1% associated with particulate...
Tipo: Text
Palavras-chave: Estuaires; Herbicides; Chloro-triazines; Dé-éthylatrazine; Comportement géochimique; Phase dissoute; Conservativité; Flux; Estuaries; Herbicides; Chloro-triazines; De-ethylatrazine; Geochemical behaviour; Conservative mixing; Flux.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00443/55443/56962.pdf

Estimation et caractérisation de la dynamique des flux dans l'estuaire de la Charente
Provedor de dados: 5
Autores: Le Moine, Olivier; Geairon, Philippe.
Le besoin de connaissance (et de partage) sur la quantification et la dynamique des apports (de matières particulaires ou dissous) des fleuves dans les écosystèmes côtiers a motivé ce travail. L'objectif est de mettre au point des méthodes de traitements spécifiques de données acquises par courantométrie Doppler pour évaluer les apports des fleuves, décrire leur dynamique au cours du cycle de marée, et caractériser l'estuaire. Le traitement du signal acquis, en complément d'autres données de bathymétrie et de la salinité permet l'estimation d'indices caractéristiques de l'estuaire du fleuve Charente. Les résultats montrent par exemple que des volumes atteignant 40 à 50 millions de mètres cubes sont déplacés à chaque marée en pic de coefficient. Des...
Tipo: Text
Palavras-chave: Estuaire Charente; Flux; Volume oscillant; Intrusions salines; Temps de résidence.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00120/23096/20943.pdf

Monitoring viral contamination in shellfish growing areas
Provedor de dados: 5
Autores: Le Guyader, Soizick; Pommepuy, Monique; Atmar, Robert.
Human and animal fecal wastes and urine contain a large number of different viruses that can enter the environment through the discharge of waste materials from infected individuals. Despite the high diversity of viruses that are introduced into the environment by human fecal pollution, only a few have been recognized to cause disease in association with consumption of contaminated shellfish. Viruses are present in shellfish in very low numbers. Nevertheless, they are present in sufficient quantities to pose a health risk as presented. This low level of contamination has made it necessary to develop highly sensitive viral extraction methods to ensure virus recovery from shellfish tissues. The most common route for accidental contamination is after heavy...
Tipo: Text
Palavras-chave: Human enteric viruses; Shellfish; Sewage; Persistence; Flux.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00015/12606/15279.pdf

Impact du sédiment sur les mortalités estivales de naissain d'huîtres creuses Crassostrea gigas en baie de Quiberon
Provedor de dados: 5
Autores: Bedier, Edouard; Knoery, Joel Radford; Fleury, Pierre-gildas; Quiniou, Francoise; Langlade, Aime; Cozic, Amandine; Delesmont, Edith; Delesmont, Régis; Caisey, Xavier; Lecureuil, Laetitia.
The phenomenon of summer mortalities of the Pacific cupped oyster Crassostrea gigas is observed in France since the beginning of the 90's. These mortalities are classically associated to younger stages and summer temperatures and occur during the reproduction period of the animal. The studies undertaken during the project Morest (2001-2005), showed that a number of biological and environmental risks, the interaction of them induces lethal stresses for animals in physiological weakness, exists in summer. Among these risks, that which is withstood by the oysters bred close to the sediment proved to be significant in intertidal areas. In Quiberon bay (southern Brittany, France), the breeding practices of sowing oysters in deep water is thus likely to expose...
Tipo: Text
Palavras-chave: Huître; Crassostrea gigas; Mortalité; Sédiment; Composé réduit; Flux; Sulfure; Ammonium; Oyster; Crassostrea gigas; Mortality; Sediment; Reduced compound; Flux; Sulphide; Ammonia.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00108/21956/19550.pdf

Chamber measurement methods and aeration effect on greenhouse gas fluxes during composting
Provedor de dados: 111
Autores: Park, Kyu-Hyun; Ngwabie, Ngwa Martin; Wagner-Riddle, Claudia.
Composting has the potential to mitigate methane (CH4) and nitrous oxide (N2O) emissions from manure.  The heterogeneous nature of emitting surfaces makes it difficult to quantify these emissions.  CH4 and N2O fluxes measured using eight small chambers (0.72 m2) and a mega chamber (90 m2) were compared, and the effect of aeration on the fluxes during composting was studied.  Two batches of compost were placed in three channels and 2-3 small flux chambers were deployed on each channel.  The channels were enclosed by a building serving as a mega chamber.  Chamber location significantly affected gas fluxes, pointing to strong spatial heterogeneity.  Mean CH4 fluxes from the small chambers were similar or 1.4 times higher compared to the mega chamber.  Mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chamber; Compost; Greenhouse gases; Aeration; Flux.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2467

Chamber measurement methods and aeration effect on greenhouse gas fluxes during composting
Provedor de dados: 111
Autores: Kyu-Hyun Park; Ngwa Martin Ngwabie; University of Guelph; Claudia Wagner-Riddle.
Composting has the potential to mitigate methane (CH4) and nitrous oxide (N2O) emissions from manure. &amp;nbsp;The heterogeneous nature of emitting surfaces makes it difficult to quantify these emissions. &amp;nbsp;CH4 and N2O fluxes measured using eight small chambers (0.72 m2) and a mega chamber (90 m2) were compared, and the effect of aeration on the fluxes during composting was studied. &amp;nbsp;Two batches of compost were placed in three channels and 2-3 small flux chambers were deployed on each channel. &amp;nbsp;The channels were enclosed by a building serving as a mega chamber. &amp;nbsp;Chamber location significantly affected gas fluxes, pointing to strong spatial heterogeneity. &amp;nbsp;Mean CH4 fluxes from the small chambers were similar or...
Palavras-chave: Chamber; Compost; Greenhouse gases; Aeration; Flux.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2467