Consulta: subjectFacets:"Sea water"
Registros recuperados: 39
Data/hora: 03/06/2024 06:41:17

Durabilité des composites pour énergie marine renouvelable
Provedor de dados: 5
Autores: Davies, Peter; Boisseau, A.; Choqueuse, Dominique; Thiebaud, F.; Perreux, D.
Composites will play an essential role in the development of ocean energy conversion systems, and their long term durability is critical to the success of these structures. Composites have been widely used in marine applications and in structures highly loaded in fatigue such as wind turbine blades. However, very few data are available to evaluate their performance under conditions which combine long term immersion in sea water and sustained cyclic loading. In this study composites reinforced with three different types of glass fibre and the same epoxy resin have been tested under these conditions, and the influence of aging on both static and fatigue behaviour has been quantified. Fibre type, resin and fibre/resin interface all influence the fatigue...
Tipo: Text
Palavras-chave: Fatigue; Eau de mer; Énergie marine; Hydrolienne; Pale; Fatigue; Sea water; Ocean energy; Tidal turbine; Blade.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00480/59161/61790.pdf

Removal of pathogens by ultrafiltration from sea water
Provedor de dados: 5
Autores: Cordier, Clémence; Stavrakakis, Christophe; Morga, Benjamin; Degrémont, Lionel; Voulgaris, Alexandra; Bacchi, Alessia; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe.
Among water treatment processes, ultrafiltration is known to be efficient for the elimination of micro-organisms (bacteria and viruses). In this study, two pathogens were targeted, a bacterium, Vibrio aestuarianus and a virus, OsHV-1, with the objective to produce high quality water from seawater, in the case of shellfish productions. The retention of those microorganisms by ultrafiltration was evaluated at labscale. In the case of OsHV-1, the protection of oysters was validated by in vivo experiments using oysters spat and larvae, both stages being highly susceptible to the virus. The oysters raised using contaminated seawater which was then subsequently treated by ultrafiltration, had similar mortality to the negative controls. In the case of V....
Tipo: Text
Palavras-chave: Ultrafiltration; Biosecurisation; Pathogen retention; Sea water; OsHV-1; Shellfish production.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00634/74576/74466.pdf

Description and modeling of polyurethane hydrolysis used as thermal insulation in oil offshore conditions
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Choqueuse, Dominique; Melot, D.
Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep sea have to be reliable, as they are in service for more than 20 years in a very severe environment: sea water, hydrostatic pressure and temperature gradient. One of the main questions is how to test and predict the lifetime of such structures in the laboratory? This study presents one approach that has been developed to characterize and predict the degradation of polymers used as thermal insulation materials.  This paper is dedicated to polyurethane (polyether based) degradation in sea water at high temperature. Ageing has been performed in natural sea water under hydrostatic pressure at temperatures...
Tipo: Text
Palavras-chave: Polyurethane; Hydrolysis; Accelerated ageing; Sea water; Coating; Offshore.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00160/27132/25330.pdf

Compréhension des mécanismes d'adhésion des biofilms en milieu marin en vue de la conception de nouveaux moyens de prévention
Provedor de dados: 5
Autores: Rubio, Celine.
Biofilm formation on surfaces immersed in sea water induces equipment damages. Recently, studies focused on the environmental impact of antifouling paints have shown that some active chemical compounds are harmful to the aquatic environment. Hence, it appears fundamental to study physico-chemical interactions existing between marine bacteria and various substrata to conceive new ecological products or antifouling processes.  First, we model an artificial primary organic film, formed by the adsorption of BSA and polysaccharide, as close as the one formed in natural seawater. This organic film is heterogeneous (only 42% of the surface is covered) and organic adsorption occurs in a multi-layer scheme, molecules bounded each others by calcium and magnesium...
Tipo: Text
Palavras-chave: Sea water; Marine bacteria; Physico chemical characterisation; MATS; XPS; IRAS; Adsorption; Bacterial adhesion; Biofim; Eau de mer; Bactéries marines; Caractérisation physicochimique; MATS; XPS; IRRAS; Adsorption; Adhésion bactérienne; Biofilm.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/these-222.pdf

Contamination des milieux aquatiques par les substances pharmaceutiques et cosmétiques - Etat des lieux et perspectives
Provedor de dados: 5
Autores: Collette-bregand, Maude; James, Alice; Munshy, Catherine; Bocquene, Gilles.
This document reports a survey of the aquatic contamination by cosmetics and medicinal products for human and veterinary uses. The contamination of the continental, estuary and coastal waters by these substances gives rise to questions on environmental risk assessment and management. Among the pharmaceutical classes involved, substances such as anti-inflammatory drugs, steroid hormones, antibiotics and hypolipemiants are of particular concern. Present regulations do not take into account the medical effluents in the environment. A significant part of these substances is not destroyed in water treatment plants whereas veterinary substances are directly spread in the environment. Some molecules occur in particularly high concentrations as shown for...
Tipo: Text
Palavras-chave: Médicaments; Produits pharmaceutiques; Vétérinaires; Cosmétiques; Émergents; Évaluation du risque environnemental; Risque chimique; Milieu marin; Pharmaceuticals; Ecotoxicity; Environmental risk assessment; Prioritization methods; Endocrine disruptors; Sewage; Sea water.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00066/17773/15295.pdf

Implantation et survie de Campylobacter jejuni/coli chez la moule Mytilus edulis
Provedor de dados: 5
Autores: Minet, Jacques; Sauvager, F; Cormier, M.
Illnesses due to marine bivalvia consumption are mostly associated with viruses as causative agents. In more than the half of cases, this agent remains unidentifies, nevertheless. So far as bacteria are concerned, Salmonella are found firstly. Campylobacters represent a major cause of gastrointestinal disease, with Salmonella, among humans. Whether campylobacteriosis may be acquired from shellfishes remains unclear. We undertook to comparatively appreciate the survival of Campylobacter jejuni/coli and Salmonella typhimurium in seawater and contaminated mussels. Bacterial enumerations where performes using microbial cultures and specific (with immunofluorescence) direct viable counts (of substrate responsive bacteria). During laboratory contamination...
Tipo: Text
Palavras-chave: Campylobacter coli; Campylobacter jejuni; Mytilus edulis; Bivalvia; Pathogenic bacteria; Seafood; Microbial contamination; Pollution effects; Bacteria; Sea water; Survival.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1606.pdf

Selection of finfish species for aquaculture development in Martinique (FWI).
Provedor de dados: 5
Autores: Thouard, Emmanuel; Soletchnik, Patrick; Marion, J.
Since 1981, in Martinique, a programme of selection of fishes suitable for aquaculture has been conducted. Zootechnical and socio-economical constraints have led to the choice of three species, endemic and exotic: the palometa (Trachinotus goodei ), the red drum (Sciaenops ocellata ) and the red florida hybrid (Oreochromis sp.).
Tipo: Text
Palavras-chave: Trachinotus goodei; Pisces; Brood stocks; Sea water; Fresh water; Recirculating systems; Survival; Eggs; Sexual maturity; Spawning; Environmental conditions; Tropical fish; Fingerlings; Rearing; Aquaculture development; Growth.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1492.pdf

Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Le Saux, V.; Paris, M; Marco, Y.
Polymers are widely used in marine environments due to their excellent properties and good weathering resistance. Despite this extensive use, their long term behaviour in such an aggressive environment is still not well known. To assess the polymer durability within reasonable durations, it is essential to perform accelerated ageing tests to accelerate the degradation kinetics but without any modification of the degradation process. This study therefore proposes and validates accelerated ageing tests to study marine ageing of a silica-filled chloroprene rubber (CR) used for offshore applications. Several accelerated ageing protocols are investigated for temperatures ranging from 20 to 80 degrees C in renewed natural seawater. The ageing consequences are...
Tipo: Text
Palavras-chave: Chloroprene rubber; Degradation; Sea water; Silica; Accelerated ageing; Natural ageing.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00073/18429/20232.pdf

Résultats préliminaires de la pollution prétrolière par l'AMOCO CADIZ. Teneurs en hydrocarbures totaux dans les eaux de mer, de la Rade de Brest à la presqu'île du Cotentin (mars - avril 1978)
Provedor de dados: 5
Autores: M0rel, G.; Courtot, P.
Results of preliminary measurements of sea water total hydrocarbon , content by infra-red show normal values in Bay of Brest but values between 100 and 200 ug/1 in North-Finistere sea waters during April 1978. Significant increases of these values are observed with increasing depths.
Tipo: Text
Palavras-chave: Hydrocarbures totaux; Méthode infra-rouge; Eau de mer; Amoco Cadiz; Nord-Finistère; Total hydrocarbons; Infra-red method; Sea water; . Amoco Cadiz; Nord-Finistère.
Ano: 1978
URL: https://archimer.ifremer.fr/doc/00306/41718/40929.pdf

Spectrophotometric Winkler determination of dissolved oxygen: re-examination of critical factors and reliability
Provedor de dados: 5
Autores: Labasque, Thierry; Chaumery, Christian; Aminot, Alain; Kergoat, Gilles.
The spectrophotometric iodine measurement for oxygen determination by the Winkler method is re-examined for theoretical and operational aspects. It is shown that the selection of an isobestic point for measuring the mixture of iodine and tri-iodide in the solution enhances reliability. The wavelength value of 466 nm was selected after a spectrum study. Then, performances are assessed by mean of statistical approach based on repeated standardization curves at the isobestic point compared with other wavelengths. At 466 nm, the method is linear up to about 1000 mumol kg(-1) of O-2. Optimization and validation of the spectrophotometric method is realized through a robustness study based on factors that may alter the results (temperature, reagent volumes,...
Tipo: Text
Palavras-chave: Isobestic point; Sea water; Spectrophotometry; Dissolved oxygen.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-1694.pdf

Detection of polycyclic aromatic hydrocarbon (PAH) compounds in artificial sea-water using surface-enhanced Raman scattering (SERS)
Provedor de dados: 5
Autores: Peron, Olivier; Rinnert, Emmanuel; Lehaitre, Michel; Crassous, Philippe; Compere, Chantal.
This paper reports an accurate synthesis of surface-enhanced Raman scattering (SERS) active substrates, based on gold colloidal monolayer, suitable for in situ environmental analysis. Quartz substrates were functionalized by silanization with (3-mercaptopropyl)trimethoxysilane (MPMS) or (3-aminopropyl)trimethoxysilane (APTMS) and they subsequently reacted with colloidal suspension of gold metal nanoparticles: respectively, the functional groups SH and NH2 bound gold nanoparticles. Gold nanoparticles were prepared by the chemical reduction of HAuCl4 using sodium tricitrate and immobilized onto silanized quartz substrates. Active substrate surface morphology was characterized with scanning electron microscopy (SEM) measurements and gold nanoparticles...
Tipo: Text
Palavras-chave: Sensor; Sea water; PAH detection; SERS; Silanization; Gold nanoparticles.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6616.pdf

A Lagrangian numerical investigation of the origins and fates of the salinity maximum water in the Atlantic
Provedor de dados: 5
Autores: Blanke, Bruno; Arhan, Michel; Lazar, A; Prevost, Gwenaelle.
The origins and fates of the Atlantic salinity maximum water (SMW), formed through excess evaporation in the tropics and subtropics of both hemispheres, are studied using monthly mean outputs of a numerical simulation of the world ocean climatological circulation. After defining formation domains from the surface salinity field and the vertical stratification, a Lagrangian technique is used to estimate the formation rates and main pathways in each hemisphere and the role of this water in the framework of the warm water return flow of the meridional overturning cell. Formation rates around 9 and 11 Sv are found in the Southern and Northern Hemispheres, respectively. While the export of the southern SMW from its formation area is realized by the western...
Tipo: Text
Palavras-chave: Atlantic ocean; Lagrangian method; Numerical simulation; Salinity; Sea water.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/2002/publication-769.pdf

Modelling the non Fickian water absorption in polyamide 6
Provedor de dados: 5
Autores: Arhant, Mael; Le Gac, Pierre-yves; Le Gall, Maelenn; Burtin, Christian; Briancon, Christophe; Davies, Peter.
This paper investigates the water absorption of polyamide 6. The high amount of absorbed water in the polymer and the large resulting decrease in the glass transition temperature (Tg) leads to a non Fickian water diffusion when samples are immersed, which is a significant difficulty when trying to model the water profile in thick specimens. The aim of this study is to be able to model this particular behaviour based on physical considerations. First, it is shown that the non Fickian water diffusion is caused by an increase in the diffusivity during water absorption. Two cases are then identified; one below Tg where the diffusivity is described using an Arrhenius law and one above Tg based on the free volume theory. Then, these two laws are implemented in a...
Tipo: Text
Palavras-chave: Water absorption; Free volume; Polyamide 6; Sea water; Modelling.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00350/46158/45856.pdf

Isolement et identification de vibrions halophiles d'une station experimentale de mariculture
Provedor de dados: 5
Autores: Bruni, V; Crisafi, E; Maugeri, T; Zaccone, R.
110 Vibrio strains were isolated, at various times of the year, from samples of sea-water supply, breeding-tank water and discarded fish used as food at the breeding stations. From the results obtained by the biochemical and cultural tests, it was possible to identify most of the isolated strains as Vibrio anguillarum . Strains with intermediate characteristics, above-all positive saccharose, proved to be numerous. The authors discuss the occurrence, in particular environments such as those being studied, of atypical or intermediate vibrio strains which are difficult to classify.
Tipo: Text
Palavras-chave: Vibrio; Microbiological culture; Bacteria; Food; Minced products; Fish ponds; Sea water; Identification; Marine aquaculture; Bacteria collecting devices; Microbiological analysis.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-997.pdf

Chemical environment of the hydrothermal mussel communities in the Lucky Strike and Menez Gwen vent fields, Mid Atlantic ridge
Provedor de dados: 5
Autores: Sarradin, Pierre-marie; Caprais, Jean-claude; Riso, Ricardo; Kerouel, Roger; Aminot, Alain.
Water samples were collected around the communities of a hydrothermal mussel, Bathymodiolus sp., in the Lucky Strike (1700 m depth) and Menez Gwen (850 m depth) areas, Mid Atlantic Ridge, and analysed for chemical constituents. The environment surrounding the organisms consists in sea water (88 to 100%) mixed with hydrothermal fluid with pH between 6.2 and 8, Sigma S (H2S + HS-) concentrations from 0 to 62 mu mol l(-1). High dissolved organic carbon (DOC) concentrations suggest a highly productive ecosystem. Production of ammonium and DOG, consumption of nitrate and sulfide in the vicinity of the organisms are among the environmental changes found in relation with local biological activity. Concentrations of Cu and Pb were high, implying that the organisms...
Tipo: Text
Palavras-chave: Environment; Sea water; Hydrothermal vents; Mussels.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00147/25847/23968.pdf

Microbial hydrogen production potential in shallow oceanic nepheloid layers.
Provedor de dados: 5
Autores: Schwarz, J; Loeblich, L; Schropp, S.
Seawater samples taken from shallow suspended particle maxima (20-57m) at or near the base of the surface mixed layer in various oceanic areas were tested for their potential to produce hydrogen (H sub(2)) gas. Results suggest that hydrogen can be bacterially produced through a fermentative process in microanaerobic niches within particulate matter. The organisms responsible for this process are ubiquitous within the temperate and tropical waters sampled. Enumeration of potential H sub(2)-producing bacteria using fluorescent antibody techniques yielded a maximum at the base of the surface mixed layer, the same depth where the greatest H sub(2) gas production potential was observed. Hydrogen-producing bacteria comprised up to 15% of the total bacterial...
Tipo: Text
Palavras-chave: Suspended particulate matter; Sea water; Gases; Biogeochemistry; Biogenic material; Hydrogen; Anaerobic bacteria; Nepheloid layer; Fermentation.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-962.pdf

Influence de la densite et de l'age des huitres japonaises (Crassostrea gigas ) sur la croissance et la composition biochimique en bassins de terre
Provedor de dados: 5
Autores: Bodoy, A; Geiaron, P; Garnier, Jacqueline; Heurtebise, S.
Two different biomasses (100 g multiplied by m super(-2) and 1 kg multiplied by m super(-2)) of oysters were put in identical sea-water ponds, thus leading to different trophic conditions, corresponding to rearing techniques. Changes in growth, biochemical composition and sexual maturation were recorded for two age groups. The first one included 9 month-old oysters and the second one 21 month-old oysters, at the beginning of the experiment. For both age groups, significant differences were observed in growth and biochemical composition. Lipids were accumulated faster for the lower biomass. However, the only difference concerning glycogen was observed on the older oysters. They showed a peak at the lowest biomass and a decrease at the larger biomass. Sexual...
Tipo: Text
Palavras-chave: Crassostrea gigas; Bivalvia; Sea water; Oyster culture; Glycogen; Age; Chemical composition; Lipids; Biochemistry; Sexual maturity; Rearing; Pond culture; Biomass; Growth; Density.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-916.pdf

Interactions entre les bacteries et les algues dans une culture continue de phytoplancton naturel soumise aux conditions exterieures
Provedor de dados: 5
Autores: Gauthier, M; Martin, Y; Lelong, P; Breittmayer, V.
During an experimental continuous culture of natural marine phytoplankton in environmental conditions, microbial and biochemical tests performed to study production of antibacterial and antialgal substances by unicellular algae. Some parameters were further monitored to characterize bacteria and phytoplankton growth. The presence of inhibitors of algal origin was studied both in the water and in the algal biomass at different phases of the culture, through bioassays performed with bacteria (marine pseudomonads and vibrios, and telluric strains) and several algal strains. Interpretation of the results is difficult. Two successive phases appeared during the growth of phytoplankton, with two different algal populations. The unsteady population of phase I was...
Tipo: Text
Palavras-chave: Bacteria; Algae; Microbiological culture; Heterotrophic organisms; Aerobic bacteria; Phytoplankton culture; Sea water; Ecological associations.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-984.pdf

Aquaculture of red tilapia Oreochromis sp. in marine environments: State of the art.
Provedor de dados: 5
Autores: Watanabe, W; Ernst, D; Olla, B; Wicklund, R.
The Caribbean Marine Research Centre is conducting research on the development of methods for intensive culture of euryhaline red tilapias in marine environments for application to Caribbean islands and similar regions with limited freshwater resources.
Tipo: Text
Palavras-chave: Survival; Growth; Eggs; Brood stocks; Incubation; Brackish water; Seed (aquaculture); Food conversion; Hatcheries; Controlled conditions; Diets; Floating cages; Sea water; Salinity tolerance; Intensive culture; Fingerlings.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/acte-1493.pdf

Accelerated ageing of polyurethanes for marine applications
Provedor de dados: 5
Autores: Davies, Peter; Evrard, Guy.
Polyurethanes are frequently used in underwater applications. They are required to resist the marine environment over long periods of immersion but the multiplicity of resin formulations makes material selection difficult. Accelerated tests are essential to guarantee long term integrity. This paper presents results from an experimental study in which polyurethane samples of two hardnesses, 40 and 90 Shore A, have been subjected to immersion in artificial sea water for periods up to two years at temperatures from 50 to 100 degrees C. In parallel samples have been immersed at sea in the Brest Estuary for up to five years. Mechanical properties have been measured on tensile specimens after ageing. The accelerated test results and FTIR analysis indicate that...
Tipo: Text
Palavras-chave: Accelerated test; Sea water; Ageing; Marine; Polyurethane.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2822.pdf

The dispersal of nitrogen-fixing Enterobacteriaceae from sewage into the waters and sediments of Morecambe Bay, UK.
Provedor de dados: 5
Autores: Jones, K; Betaieb, M.
The sediments of Morecambe Bay contain large numbers of salinity-tolerant, nitrogen-fixing Enterobacteriaceae (NFEs) mainly Klebsiella pneumoniae ) which appear to be derived from sewage. Sewage effluents, regardless as to whether they have received primary or secondary treatment, contain huge numbers of NFEs with salinity-tolerant and freshwater strains present in roughly equal quantities. The bacteria are discharged into the rivers and estuaries and carried out to sea. Once in the sea the salinity-tolerant strains retain their viability better than the freshwater strains so that the incoming tide, which doses the sediments, contains mainly salinity-tolerant NFEs. It is probable that similar processes occur all round the U.K. coast, as inshore coastal...
Tipo: Text
Palavras-chave: Klebsiella pneumoniae; Enterobacteriaceae; Salinity tolerance; Microbial contamination; Pathogenic bacteria; Bacteria; Sewage; Nitrogen fixation; Sediment pollution; Sea water.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1003.pdf

First steps of biofilm formation on stainless steels in natural seawater
Provedor de dados: 5
Autores: Bellon-fontaine, M.-n.; Bertrand, P; Compere, Chantal; Costa, D; Guezennec, Jean; Marcus, P; Poleunis, C.; Pradier, C.-m.; Rondot, B; Walls, M.g.
Numerous works are reported in literature concerning the biofilm growth on surfaces in seawater but the understanding of the adhesion mechanisms in the first steps of immersion is still subject to investigations. A knowledge of the chemical composition and of the kinetics of conditioning layer formation is a central requirement for a sound scientific understanding of biofilm growth. Due to its complexity and to the interdisciplinary nature of the subject, this research asks for the collaboration between the fields of material science, surface analyses, chemistry, marine microbiology and biochemistry. The first steps of biofilm formation on 316L stainless steels immersed in natural sea water have been studied, using a broad range of surface characterisation...
Tipo: Text
Palavras-chave: Sea water; Substrates; Biofilm.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/acte-1699.pdf

Concevoir des structures pour l'élevage des poissons en mer
Provedor de dados: 5
Autores: Priour, Daniel.
The quick evolution of fish farming in Europe, and its development towards the open sea needs suitable farming tools. These tools must withstand the difficult sea states, but they must be easy to use, well adapted to the fish farming and not too much expensive. This book helps the design of such tools. It defines the solicitations of the sea on all the structures, and presents rules and methods to control these solicitations. Here, a structure is composed of a rearing support, a mooring system and equipments. This book describes these components, class them and gives lists of providers. The rearing support can be a cage, a group of cages or a boat. The support can float or to be submersible. The mooring system can be made up ropes, chains, anchors,...
Tipo: Text
Palavras-chave: Aquaculture equipment; Mooring systems; Anchoring; Aquaculture techniques; Structures; Sea water; Life support systems; Aquatic environment; Cage culture; Marine technology; Rearing; Fish culture.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-1667.pdf

La conchyliculture française - 1° Partie : Le milieu naturel et ses variations
Provedor de dados: 5
Autores: Marteil, Louis.
Table of Contents  The Natural Environment      Production centres           Oyster farming centres           Mussel farming centres  Chapter I. - The Physicochemical Environment      I. Sea Water           a) Transparency, turbidity            b) Temperature           c) Salinity           d) Dissolved gases           e) Substances dissolved in the water           f) Water movements           g) Hydrology of the main shellfish farming centres      II. Soils           a) Soil properties           b) Mechanical amendment of soils, its effects           c) Fertilisation of soils in shellfish farming           d) Changes in soils due to farming      Bibliography  Chapter II. - The Natural Environment      Phytoplankton      Zooplankton           Basic biology...
Tipo: Text
Palavras-chave: Zooplankton; Phytoplankton; Water pollution; Sea water; Natural environment; Shellfish culture.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-1776.pdf

Limits in the validity of Arrhenius predictions for field ageing of a silica filled polychloroprene in a marine environment
Provedor de dados: 5
Autores: Le Saux, V.; Le Gac, Pierre-yves; Marco, Y.; Calloch, S.
Accelerated ageing in natural sea water at different temperatures from 20°C to 80°C was performed on a silica filled polychloroprene rubber. Degradation when monitored with mechanical properties at both macroscopic and microscopic scale led to a large increase of the modulus coupled with a strong decrease of strain and stress at break. Data from tensile tests were used for lifetime prediction with an Arrhenius extrapolation for modulus, strain and stress at break. The validity of this lifetime prediction was evaluated using a 23 year-old sample aged in natural conditions. Strain at break could be predicted using an Arrhenius extrapolation with an activation energy of 50 kJ/mol. However, an extrapolation based on linear Arrhenius behavior did not apply for...
Tipo: Text
Palavras-chave: Polychloroprene rubber; Accelerated and natural ageing tests; Arrhenius extrapolation; Lifetime prediction; Sea water.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00164/27523/25679.pdf

Biodegradation du petrole en mer. Influence de l'apport d'azote et de phosphore sous forme minerale
Provedor de dados: 5
Autores: Lepetit, J; Guiot, J; Martin, Y; Tagger, S.
To exploit the presence in the sea of microorganisms capable of degrading petroleum products a mineral fertilizer, containing immediatly assimilable nitrogen and phosphorus compounds, was used to increase the microbial population and therefore, the degradation potential of treated polluted waters. The fertilizer supply caused an increase in heterotrophic and hydrocarbon-splitting bacteria and an increase in the phytoplanktonic biomass. The latter is characterized by an increase in a few selected species; it constitutes an important supply of organic substances, and it is responsible for increasing the dissolved oxygen which is essential for petroleum oxidation. Supplying the fertilizer results in an increase in the treated water degradation potential and a...
Tipo: Text
Palavras-chave: Bacteria; Microorganisms; Heterotrophic organisms; Phosphorus compounds; Nitrogen compounds; Fertilizers; Hydrocarbons; Biodegradation; Sea water.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1020.pdf

Determinación de niveles actuales de 137Cs en aguas marinas en el trayecto Guayaquil-Isla Greenwich y en algunos componentes del ecosistema acuático en Punta Fort William
Provedor de dados: 20
Autores: Rojas, P.
Con el fin de evaluar el impacto de la contaminación radiactiva atmosférica sobre las masas de agua del Continente Antártico, originado en los procesos de fisión de la industria nuclear como también por las últimas explosiones nucleares, efectuadas de septiembre de 1995 a enero de 1996 en la Polinesia Francesa, se realizó un estudio de la actividad actual del 137Cs en agua superficial de mar. Se tomaron las muestras en el trayecto Guayaquil-Isla Greenwich; las mismas que después de ser analizadas mediante espectroscopía Gamma de alta resolución, se determina que la concentración de Cs se encuentra dentro de los límites permisibles.
Tipo: Journal Contribution
Palavras-chave: Radioactive contamination; Sea water; Polar waters; Radioactive contamination; Sea water; Http://aims.fao.org/aos/agrovoc/c_28321; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 1998
URL: http://hdl.handle.net/1834/3845

Aspectos químicos del sistema bentónico del golfo San Jorge, Argentina (2005-2010)
Provedor de dados: 20
Autores: Fernández, M.B.; Cucchi Colleoni, A.D.
Chemical aspects of the San Jorge Gulf benthic system, Argentina (2005-2010). A new contribution on the chemical aspects of the San Jorge Gulf benthic system in the distribution area of shrimp Pleoticus muelleri (Spence Bate, 1888) during 2005-2010 is presented. Concentration of dissolved oxygen in bottom water and mix layer and of total organic matter (TOM), total organic carbon (TOC), total nitrogen (TN), chlorophyll a (Chl a) and phaeopigments (Phaeo) in surficial sediments were analyzed. The origin and nutritional value of TOM deposited were also assessed through the C:N ratio. Water samples were collected during the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) seasonal research cruises in the period 2005-2010. Sediment samples...
Tipo: Journal Contribution
Palavras-chave: Chemical composition; Sediments; Dissolved oxygen; Sea water.
Ano: 2013
URL: http://hdl.handle.net/1834/5506

Reproductive cycle of edible echinoderms from the Southwestern Indian Ocean:  I. Tripneustes gratilla L. (Echinoidea, Echinodermatata)
Provedor de dados: 20
Autores: Vaïtilingon, D.; Rasolofonirina, R.; Jangoux, M.
The reproductive cycle of the edible echinoid Tripneustes gratilla (Linneaus 1758) was investigated in a population located in the southwest coast of Madagascar (Toliara). The reproductive cycle was followed for two consecutive years (October 1999 to October 2001) and characterised by means of gonad and maturity indices. T. gratilla has an annual reproductive cycle mediated by seawater temperature, day length and feeding activity. The histology of the gonads revealed six different maturity stages grouped in three main reproductive phases: growing and maturing, spawning, and spent and recovering. Reproduction is seasonal. Growing and maturing stages occurred from late summer to early winter correlating with decreasing temperatures and day length. Spawning...
Tipo: Journal Contribution
Palavras-chave: TRIPNEUSTES GRATILLA; Abiotic factors; Sexual maturity; Reproductive cycle; Temperature; Sea water; Maturity; Temperature.
Ano: 2005
URL: http://hdl.handle.net/1834/1133

The anthropogenic effluents of the human activities on the red sea coast at hurghada harbour (case study)
Provedor de dados: 20
Autores: Madkour, H.A.; Dar, M.A.
The heavy metal accumulations in the seawater, coral reefs and two effective fractions of underlying sediments (&lt;0.125mm and &lt; 0.063mm) were studied in the coastal and tidal flat zones at the main shipyard near of Hurghada Harbour. The area of investigation is very worse whereas, it is considered tailing outlet for both solid and liquid influents of many human activities in/and surrounding the harbour. The solid phases are of construction remains, paint remains, iron pipe rusts, hydrocarbons, plastic bags, metal and wood remains as well as the artificially conglomerate stones that thrown in the in the marine area. The liquid phase is restricted in the continuous brine water draining to the sea from a huge desalination plant (Capacity 5000 cubic...
Tipo: Journal Contribution
Palavras-chave: Environmental Study; Sediments; Sea water; Coral reefs; Heavy metals; Coral reefs; Heavy metals; Sea water; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 2007
URL: http://hdl.handle.net/1834/1890

Distribución espacial del amonio en fiordos y canales comprendidos entre Puerto Montt y Laguna San Rafael en período de primavera
Provedor de dados: 20
Autores: Prado-Fiedler, R.
An oceanographic expedition was carried out between October 18th and November 15th 1995 in the inlets region and fjords located between Puerto Montt (41° 20’S and San Rafael Lagoon (46° 40’ S) in Southern Chile. The main purpose of the present work is to characterise the spatial distribution of ammonium and its concentration range in the studied region during spring onset. Water samples were collected from a total of 101 oceanographic stations of the expedition Cimar-Fiordo 1. The main part of the water body showed concentrations lower than 1 µmol/L. The higher ammonium concentrations were found in the continental fjords, specially in the area situated south of the narrows of Meninea island, where subsurface maximums greater than 2 µmol/L were found. The...
Tipo: Journal Contribution
Palavras-chave: Fjords; Water properties; Ammonia; Water content; Channels; Water analysis; Water sampling; Surface layers; Core layers (water); Sea water; Fjords; Water content; Ammonia; Water analysis; Sea water; Http://aims.fao.org/aos/agrovoc/c_16314; Http://aims.fao.org/aos/agrovoc/c_15852; Http://aims.fao.org/aos/agrovoc/c_349; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 2000
URL: http://hdl.handle.net/1834/1576

Síntesis de datos físico-químicos del agua de mar obtenidos durante las campañas del Proyecto PID Nº 371 en el Golfo San Matías y Bahía de San Antonio, durante el periodo 2004 - 2007
Provedor de dados: 20
Autores: Ocampo Reinaldo, M.; Storero, L.P.
Se presentan una recopilación de datos de parámetros físico-químicos del agua de mar, recolectados en diferentes sitios del Golfo San Matías, la Bahía de San Antonio y otras zonas intermareales y submareales aledañas. La información se recolectó entre 2004 y 2007 en actividades de campañas de investigación y salidas de campo programadas del Proyecto PID 2003 Nº 371 y de otros proyectos relacionados
Tipo: Report
Palavras-chave: Sea water; Water analysis; Water samples; Chemical oceanography; Physical oceanography; Sea water; Water analysis.
Ano: 2007
URL: http://hdl.handle.net/1834/4384

Características químicas de las aguas marinas ecuatorianas durante 1988
Provedor de dados: 20
Autores: Rodríguez de Morán, A.
Se presenta un estudio de las características de las aguas ecuatorianas, mediante el análisis químico de las muestras obtenidas durante los cruceros I y II realizados a bordo del BAE ORION en los meses de Agosto y Diiciembre de 1988. Se realiza las caracterización de los diferentes ambientes hasta los 100 m de profundidad, estableciéndose el comportamiento de los parámetros hidroquímicos, tanto en su distribución horizontal geográfica, como vertical en la columna de agua y su relación con el frente Ecuatorial. Se establece, en forma general, la influencia de la presencia de la Corriente de Humboldt, en la concentración y distribución de los parámetros en el CO-I-88; y el debilitamiento de la misma en el CO-II-88. Evideciándose por lo tanto, aguas más...
Tipo: Journal Contribution
Palavras-chave: Chemical oceanography; Sea water; Ocean currents; Ocean currents; Chemical oceanography; Sea water; Http://aims.fao.org/aos/agrovoc/c_12883; Http://aims.fao.org/aos/agrovoc/c_1516; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 1990
URL: http://hdl.handle.net/1834/2167

Cultivo a baja salinidad de postlarvas de Litopenaeus vannamei con diferentes relaciones de K+/ Na+
Provedor de dados: 20
Autores: Cabrera Machado, J. E.; Jaime Ceballos, B.
An experiment was designed totally randomized to study the influence of  different rate of Na+/K+ (5, 30, 55, 70, 95 and 120). Massive mortality was  presented to the sixth day of the treatments I and III (Na+/K+=5 and  Na+/K+=120), to the seventh day the treatment V (Na+/K+=95) and  to the  eighth day of the treatment IV (Na+/K+=70). The treatments II and III  (Na+/K+=30 and Na+/K+=55 respectively) they stayed in the time, when  indicating a bigger tolerance of the postlarvae in these ranges of Na+/K+;  however, the mortality of the treatment II were significantly bigger (p &lt;0.01) that  in the treatment  III, in which 90-100% survival was observed. The results  indicate a better physiologic answer of L. vannamei postlarvae to relationships  Na+/K+...
Tipo: Preprint
Palavras-chave: Marine shrimp culture; Sea water; Prawns and shrimps; Http://aims.fao.org/aos/agrovoc/c_6156.
Ano: 2011
URL: http://hdl.handle.net/1834/4149

Aspectos generales sobre la estructura térmica superficial del mar, de la zona comprendida entre el golfo de Penas y la boca occidental del estrecho de Magallanes
Provedor de dados: 20
Autores: Boré, D.; Barbieri, M.A.; Catasti, V.
This study was carried out within the Project Cimar-Fiordo 2. The general objective was to describe the sea surface temperature in the zone between 46º LS and 52º LS, and from the 73º 52’ LW to the 76º 30’ LW, considering the channel and fjord zone. The analysis was based on satellite images of sea surface temperature. The images used came from the AVHRR radiometer of the NOAA satellite, from the year 1995 to 1998.   The cartographic representation and the analysis of the seasonal variability of the sea surface temperature was made using the software of the Geographical Information System (GIS), named IDRISI. The zone was with clouds during all the period of study, mainly in autumn. With the available images it was possible to observe a big difference...
Tipo: Journal Contribution
Palavras-chave: Water temperature; Fjords; GIS; Satellite sensing; Radiometers; Surface temperature; Sea water; Thermal structure; Water temperature; Fjords; Radiometers; Sea water.
Ano: 2001
URL: http://hdl.handle.net/1834/1578

A room temperature procedure for the manual determination of urea in seawater
Provedor de dados: 27
Autores: Goeyens, L.; Kindermans, N.; Yusuf, M.A.; Elskens, M.
Several earlier studies underpin the important role of dissolved organic matter and more particularly urea in phytoplanktonic nitrogen uptake fluxes. Generally, the determination of urea concentrations relies on the formation of an imidazolone-thiosemicarbizide complex, a complexation which requires very accurate temperature control when carried out at high temperature. It is also possible, however, to obtain reliable results with a room temperature procedure. The measured abundances for both complexation at high temperature (85 degree C, 20 min) and at ambient temperature (22 degree C, 72 h) are closely comparable. Lower values are observed for temperatures &lt;10 degree C though. Moreover, a comparison of both techniques reveals similar precision...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissolved organic carbon; Sea water; Temperature; Urea; Water analysis.
Ano: 1998
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7858

Radiochemical study of Cd , Co and Eu coprecipitation with Iron Hydroxide in seawater
Provedor de dados: 27
Autores: Chakravorty, R.; Van Grieken, R.
The coprecipitation of Cd, Co and Eu from seawater onto ferric hydroxide was studied, using the radioactive tracers &lt;sup&gt;109&lt;/sup&gt;Cd, &lt;sup&gt;60&lt;/sup&gt;Co and &lt;sup&gt;152-154&lt;/sup&gt;Eu, as a function of the pH, the concentration of the collector iron, the concentration of the metal spike and the aging of the internally formed precipitate. For preconcentration purpose, a pH 9 and a 35 ppm iron concentration appeared to be suitable. At pH 8, the natural pH of seawater, the distribution coefficients for Cd, Co and Eu are 10&lt;sup&gt;4.5&lt;/sup&gt;, 10&lt;sup&gt;5&lt;/sup&gt; and 10&lt;sup&gt;7&lt;/sup&gt;, respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadmium; Coprecipitation; Radiochemistry; Sea water.
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3236

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

Apparent resistivity and spectral induced polarization in the submarine environment
Provedor de dados: 42
Autores: SOUZA,HERCULES DE; SAMPAIO,EDSON E. S.
Relatively few investigations have employed electrical methods in the submarine environment, which may be promising for mineral deposits or threatened by environmental problems. We have measured the electric field using both disk and bar electrodes in the sea water at three different levels: sea surface, seven meters deep, and sea bottom at a depth of ten meters, employing a 2 m spacing dipole-dipole array with 7 array spacings of investigation, and 13 values of frequencies at steps of (2N hertz, N = -2, -1, 0, 1, 2,.....10). The measurement allowed the analysis of the electric field as a function of frequency and spacing, and of the spectral induced polarization. Modelling and interpretation of the apparent resistivity yielded a good fit with previous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Complex apparent resistivity; Induced polarization; Forward modeling; Sea water.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300011