Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAno

Imprime registros no formato resumido
Registros recuperados: 62
Primeira ... 1234 ... Última
Imagem não selecionada

Imprime registro no formato completo
Etude du phosphore dans les sédiments ostréicoles du bassin des Chasses des Sables d'Olonne ArchiMer
Feuillet, Michèle.
Tipo: Text Palavras-chave: Biscay bay; Oyster culture zone; Marine sediment; Seawater; Phosphorus.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1971/publication-2240.pdf
Imagem não selecionada

Imprime registro no formato completo
Mesure de la demande chimique en oxygène dans l'eau de mer. ArchiMer
Michel, Pierre.
Introduction: Measuring the chemical oxygen demand (COD) is a way of determining the organic matter in water based on its oxidisibility by bichromate. The presence of organic matter in sea water is one of the factors that determines the productivity of the oceans: whether this organic matter will be absorbed directly or must first be transformed into nutritive substances by bacteria. This beneficial action also has its limits. On the one hand, consumption of organic matter remains limited; when it exceeds a certain rate, there is no longer any increase in productivity. On the other hand, the excess organic matter deteriorates by consuming the dissolved oxygen and thus competes with marine life. In extreme cases, this excess can cause the eutrophication of...
Tipo: Text Palavras-chave: Methodology; Organic matter; Oxygen demand; Seawater.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-2060.pdf
Imagem não selecionada

Imprime registro no formato completo
Estudios sobre factores que afectan la calidad de la merluza fresca OceanDocs
Avdalov, Nelson.
Among other results, it was found that when hake is handied property it maintains good quality levels up to 10 days after catch, irrespective of season. Its total storage life in boxes with ice is approximately two weeks. Although total storage life remained unchanged, it was found that quality levels tended to be significantly higher if overfilling of boxes was avoided, if the fish was gutted immediately after catch, or if hake was stored in containers with seawater.
Tipo: Report Palavras-chave: Quality control; Fish storage; Seawater; Gutting; Cold storage.
Ano: 1982 URL: http://hdl.handle.net/1834/4903
Imagem não selecionada

Imprime registro no formato completo
Bilan 1992 de la contamination des côtes françaises par les composés organostanniques ArchiMer
Michel, Pierre; Averty, Bernard.
Au cours du printemps 1992, un échantillonnage systématique a permis d'évaluer le niveau de la contamination des côtes françaises par les composés organostanniques. Le tributyl étain (TBT) a été mesuré dans la phase dissoute avec ses produits de dégradation dibutyl étain (DBT) et monobutyl étain (MBT). Les concentrations mesurées restent importantes dans les zones portuaires et les zones de mélanges. Ces concentrations sont le plus souvent excessives lorsqu'on se réfère au seuil toxique de 1ng.1-1 pour lequel des effets sont connus sur l'huître et certains autres mollusques. Les trois façades maritimes françaises ont été contôlées ; c'est en Méditerranée que l'on peut observer les plus fortes concentrations. En plus du TBT et de ses métabolites, on a aussi...
Tipo: Text Palavras-chave: Tributyl étain; Dibutyl étain; Monobutyl étain; Triphényl étain; Composés organostanniques; Eau de mer; France.; Tributyltin; Dibutyltin; Monobutyltin; Triphenyltin; Organotin compounds; Seawater; French coasts.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00104/21530/19111.pdf
Imagem não selecionada

Imprime registro no formato completo
Adaptative responses of E-coli to marine environmental stresses. a modelling approach based on viability and dormancy concepts ArchiMer
Martin, Y; Troussellier, Marc; Bonnefont, Jl.
In an attempt to synthesize conceptual and experimental information on the behaviour of enteric bacteria in seawater, a mathematical model has been developed. This model is based on changes in intracellular metabolisable components depending an physiological responses of the cell when subjected to nutrient starvation, salinity stress and solar radiation. Following a strategy which takes into account short- and mid-term physiological adaptation and reversal processes, the cells can develop in different states: culturable (B-1), viable and definitively nonculturable (B-2), and reversibly dormant (B-3) cells. Model parameters were deduced either from original microcosm experiments, from literature data or calibration procedures. Validation of the model was...
Tipo: Text Palavras-chave: Escherichia coli; Eau de mer; Stress; États cellulaires; Modélisation; Escherichia coli; Seawater; Stress; Cellular states; Modelling.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43646/43224.pdf
Imagem não selecionada

Imprime registro no formato completo
Devenir des virus entériques en mer et influence des facteurs environnementaux ArchiMer
Gantzer, Christophe; Dubois, Éric; Crance, Jean-marc; Billaudel, Sylviane; Kopecka, Helena; Schwartzbrod, Louis; Pommepuy, Monique; Le Guyader, Françoise.
To improve the knowledge of the survival of enteric viruses in a marine environment, the influence of physico-chemical parameters (temperature, UV, salinity) on the survival of infectious poliovirus 1 and hepatitis A Virus (HAV) in seawater was first studied, the influence of suspended solids (SS) on poliovirus adsorption and survival in seawater was then evaluated and the detection of rotavirus genome in environmental samples (shellfish, river water, treated wastewater) was finally investigated. The results show that temperature has a major impact on virus survival in seawater as the time necessary to inactivate 90 % of the virus (T-90) is 671 days at 4 degrees C and only 25 days at 25 degrees C. Ultraviolet light (42 mW s cm(-2)) rapidly inactivates...
Tipo: Text Palavras-chave: Environmental factors; Survival; Seawater; Enteric viruses; Facteurs environnementaux; Survie; Eau de mer; Virus entériques.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-846.pdf
Imagem não selecionada

Imprime registro no formato completo
Responses of enteric bacteria to environmental stresses in seawater ArchiMer
Troussellier, Marc; Bonnefont, Jean-luc; Courties, Claude; Derrien, Annick; Dupray, Elizabeth; Gauthier, Michel; Gourmelon, Michele; Joux, Fabien; Lebaron, Philippe; Martin, Yvan; Pommepuy, Monique.
The effects of different environmental factors (nutrient deprivation, hyperosmotic shock, exposure to light) on enteric bacteria which have been transferred into the marine environment, have been studied experimentally (microcosms) by considering demographic, physiological and genetic responses in Escherichia coli or Salmonella typhimurium populations. Short-term experiments (less than or equal to 48 h) showed that nutrient deprivation induced limited changes in measured bacteriological variables, but when combined with hyperosmotic shock, it results in an energy charge decrease and inactivation of membrane transport. Light exposure mainly affects the colony-forming capacity of bacterial populations. Combining different stress factors confirmed the rapid...
Tipo: Text Palavras-chave: Genetics; Cellular states; Physiology; Seawater; Enteric bacteria; Génétique; Etats cellulaires; Physiologie; Eau de mer; Entérobactéries.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-845.pdf
Imagem não selecionada

Imprime registro no formato completo
Biofilms en mileu marin ArchiMer
Compere, Chantal.
Introduction: Almost all submerged surfaces in the marine environment are subject to developing an organic film, with the exception of some living organisms, such as sponges, which do not undergo any great colonization, for no currently-known scientific reason. The presence of this biofilm is at the source of many problems in the oceanographic field and for marine business. This article introduces some drawbacks relating to the existence of this fouling and elaborates upon the main studies conducted at IFREMER concerning the most-used methods for combating it. However, the anti-fouling agents that are generally used for protecting facilities are toxic and can have disastrous consequences on the marine environment's fauna and flora. Moreover, the use of...
Tipo: Text Palavras-chave: Biofilm; Seawater.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-1698.pdf
Imagem não selecionada

Imprime registro no formato completo
C18 Sep-Pak extractable dissolved organic copper related to hydrochemistry in the North-West Mediterranean ArchiMer
El Sayed, Mohamed A.; Aminot, Alain.
Extractable organic copper using C18 Sep-Pak cartridges was investigated in seawater after laboratory experiment showed that the (C18 Sep-Pak) cartridges were reliable, in open and coastal waters with normal levels of dissolved organic carbon, for the separation of a specific fraction of organo-copper complexes.Given that the Sep-Pak cartridges retain the hydrophobic fraction of the dissolved organic matter, this extraction technique was applied for studying the characteristics of this particular hydrophobic dissolved organic copper fraction (hDOCu) in the north-western Mediterranean waters. Surface distribution of hDOC is influenced by organic matter input from the river Rhone and its estuary as well as the physical processes affecting the primary...
Tipo: Text Palavras-chave: Mediterranean sea; Seawater; Dissolved organic matter; Copper compounds.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-1681.pdf
Imagem não selecionada

Imprime registro no formato completo
Réaction de réduction de l'oxygène sur les aciers inoxydables en eau de mer naturelle. Influence du biofilm sur les processus de corrosion ArchiMer
Le Bozec, Nathalie.
iofilm development on stainless steels immersed in natural seawater can have prejudicial consequences on the resistance of these materials to corrosion . The goal of the present study was to get more precise information on the corrosion processes, and especially on the oxygen reduction reaction. As the reaction is linked to the stainless steel surface state, the characterisation of the oxides films (composition, structure, thickness...) is essential to understand the mechanisms and the oxygen reduction kinetic. The first aim of the study has been to correlate the oxygen reduction processes with the characteristics of the oxides layer as a function of the alloy surface treatment (mechanical polishing, electrochemical passivation and prereduction, chemical...
Tipo: Text Palavras-chave: Hydrogen peroxide; Oxides layer; Biofilm; Oxygen reduction; Corrosion; Seawater; Stainless steels; Peroxyde d'hydrogène; Films d'oxydes; Biofilm; Réduction de l'oxygène; Corrosion; Eau de mer; Aciers inoxydables.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2004/these-223.pdf
Imagem não selecionada

Imprime registro no formato completo
An automated photo-oxidation method for the determination of dissolved organic phosphorus in marine and fresh water ArchiMer
Aminot, Alain; Kerouel, Roger.
A segmented flow automated method with on-line photo-oxidation for the determination of dissolved organic phosphorus + soluble reactive phosphorus (DOP + SRP) in seawater and fresh water is described here. A low-power lamp was used for a compact, easy-to-handle and low-ozone-producing manifold. The influence of seawater matrix components was studied in detail using natural seawater and salt solutions spiked with DOP model compounds. Bromide was found to be the most inhibitory species in seawater. The work shows that most salt solutions referred to as artificial seawater are not satisfactory model matrices to test the actual seawater matrix effect. Since DOP recovered in undiluted seawater samples was about half that obtained in fresh water samples, the...
Tipo: Text Palavras-chave: Measurement; Fresh water; Seawater; Total dissolved phosphorus; Dissolved organic phosphorus.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-1678.pdf
Imagem não selecionada

Imprime registro no formato completo
Kinetics of conditioning layer formation on stainless steel ArchiMer
Compere, Chantal; Bellon Fontaine, M.-n.; Bertrand, P; Costa, D; Marcus, P; Poleunis, C; Pradier, C.m.; Rondot, B; Walls, M.g..
Adhesion of micro-organisms to surfaces in marine environments leads to biofouling. The deleterious effects of biofilm growth in the marine environment are numerous and include : energy losses due to increased fluid frictional resistance or to increased heat transfer resistance, risk of corrosion induced by micro-organisms, loss of optical properties, quality control and safety problems. Antifouling agents are generally used to protect surfaces from being affected by such a biofilm. These agents are toxic and can be persistent, causing harmful environmental and ecological effects. Moreover, the use of biocides and regular cleaning considerably increase the maintenance costs of marine industries. An improved knowledge of the biofilm adhesion mechanisms is...
Tipo: Text Palavras-chave: Biofilm; Surface characterisation; Carbohydrates; Protein; Seawater; Conditioning layer.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/publication-1701.pdf
Imagem não selecionada

Imprime registro no formato completo
New bioemulsifiers produced by Candida lipolytica using D-glucose and babassu oil as carbon sources BJM
Vance-Harrop,Mabel H.; Gusmão,Norma B. de; Campos-Takaki,Galba Maria de.
Candida lipolytica IA 1055 produced extracellular biosurfactants with emulsification activity by fermentation using babassu oil and D-glucose as carbon sources. Natural seawater diluted at 50% supplemented with urea, ammonium sulfate, and phosphate was used as economic basal medium. The best results were achieved with the YSW-B2 medium, which contained urea, ammonium sulfate, and babassu oil and with YSW-B3 medium, which contained urea, ammonium sulfate, phosphate, and babassu oil, kept under fed batch fermentation for 60 hours with 5% of babassu oil. For the two media, the maximum specific growth rates were 0.02 h-1 and 0.04 h-1; the generation times were 34.6 h-1 and 17.3 h-1, and the emulsification activities were 0.666 and 0.158 units, respectively....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioemulsifier; Candida lipolytica; Seawater; Babassu oil.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000200006
Imagem não selecionada

Imprime registro no formato completo
TRANSMER, un modèle hydrodynamique rapide et précis pour la simulation à moyen et long terme des transferts de radionucléides en Manche et dans le sud de la Mer du Nord ArchiMer
Bailly Du Bois, Pascal; Dumas, Franck.
TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. It has been qualitatively and quantitatively validated by 1400 measurement of 125Sb in seawater. This model evaluates the medium- and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year).
Tipo: Text Palavras-chave: English Channel; North Sea; Radionuclide; Concentration; Dispersion; Dissolved substances; Seawater; Hydrodynamic model; Modèle; Sb 125; Dispersion; Mer du Nord; Manche.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-563.pdf
Imagem não selecionada

Imprime registro no formato completo
Detection of ostreid herpesvirus 1 (OsHV-1) DNA in seawater by PCR: influence of water parameters in bioassays ArchiMer
Vigneron, Vassilia; Solliec, Gaelle; Montanie, Hélène; Renault, Tristan.
Since 1991, herpesvirus infections have been reported among larvae and juveniles of various bivalves. Most of the studies focused on detection of viral infections of economically important species. However, the persistence of bivalve herpesviruses; in the marine environment is poorly documented. The present study concerns the role of seawater parameters in Ostreid Herpesvirus I (OsHV-1) detection by polymerase chain reaction (PCR). Viral DNA extracted from purified particles or virions present in infected oyster larvae were detected by PCR after storage in different media at different temperatures. The lowest detection threshold was found using distilled water or Tris EDTA buffer. In seawater, the threshold was higher. The use of sterile media permitted...
Tipo: Text Palavras-chave: Temperature; PCR; Detection; Seawater; Viral DNA; Oyster herpesvirus 1.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-2909.pdf
Imagem não selecionada

Imprime registro no formato completo
Rotavirus VLP2/6: a new tool for tracking rotavirus in the marine environment ArchiMer
Loisy, Fabienne; Atmar, Robert L.; Cohen, Jean; Bosch, Albert; Le Guyader, Soizick.
The potential of rotavirus 2/6-virus-like-particles (VLP2/6) for use as tracers in the marine environment was investigated. The stability of bovine rotavirus (strain RF) and VLP2/6 in natural seawater at 25degreesC for six days was studied. ELISA and western blot methods were used to quantify the particles. The rates of decline of rotavirus particles and VLP2/6 were similar (approximately 0.5 log 10 per day). Western blot analysis showed that the integrity of capsid proteins VP2 and VP6 was conserved during the incubation time. These results demonstrate that VLP2/6 particles have the same stability in seawater as rotavirus particles. Thus, VLP2/6 can be used as a tracer, which should be of particular value for studying the fate of rotavirus particles in...
Tipo: Text Palavras-chave: Stability; Tracer; Seawater; Virus like particles; Rotavirus.
Ano: 2004 URL: https://archimer.ifremer.fr/doc/2004/publication-330.pdf
Imagem não selecionada

Imprime registro no formato completo
Sanitary quality of sands from marine recreational beaches of São Paulo, Brazil BJM
Sato,Maria Inês Zanoli; Di Bari,Marisa; Lamparelli,Claudia Condé; Truzzi,Ana Cristina; Coelho,Maria Cristina L.S.; Hachich,Elayse Maria.
A sanitary evaluation of sand and water from 16 beaches of São Paulo State, Brazil, was undertaken during spring of 1997 and summer of 1998. Ninety six samples each of wet and dry sand and seawater were collected and analysed for fecal indicator bacteria. A parasitological examination and Candida albicans analysis were also performed in sand samples and F-specific bacteriophages were determined in seawater. Statistical analysis of the results demonstrated higher concentrations of fecal coliforms and fecal streptococci in dry sand during summer. Correlation analysis indicated a significant relationship between fecal indicator densities in wet sand and seawater. There was a significant correlation between the densities of fecal coliforms and fecal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sand; Seawater; Recreational areas; Fecal indicators; Microbiological criteria.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400003
Imagem não selecionada

Imprime registro no formato completo
Impact of environmental factors on in situ determination of iron in seawater by flow injection analysis ArchiMer
Laes, Agathe; Vuillemin, Renaud; Leilde, Bernard; Sarthou, Géraldine; Bournot Marec, Claudie; Blain, Stéphane.
A sensitive method for iron determination in seawater has been adapted on a submersible chemical analyser for in situ measurements. The technique is based on flow injection analysis (FIA) coupled with spectrophotometric detection. When direct injection of seawater was used, the detection limit was 1.6 nM, and the precision 7%, for a triplicate injection of a 4 nM standard. At low iron concentrations, on line preconcentration using a column filled with 8-hydroxyquinoline (8HQ) resin was used. The detection limit was 0.15 nM (time of preconcentration = 240 s), and the precision 6%, for a triplicate determination of a I nM standard, allowing the determination of Fe in most of the oceanic regimes, except the most depleted surface waters. The effect of...
Tipo: Text Palavras-chave: Temperature and pressure effects; Submersible chemical analyser; Seawater; In situ measurements; Iron; Flow injection analysis.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-1209.pdf
Imagem não selecionada

Imprime registro no formato completo
Use of rotavirus virus-like particles as surrogates to evaluate virus persistence in shellfish ArchiMer
Loisy, Fabienne; Atmar, R; Le Saux, Jean-claude; Cohen, J; Caprais, Marie-paule; Pommepuy, Monique; Le Guyader, Soizick.
Rotavirus virus-like particles (VLPs) and MS2 bacteriophages were bioaccumulated in bivalve mollusks to evaluate viral persistence in shellfish during depuration and relaying under natural conditions. Using this nonpathogenic surrogate virus, we were able to demonstrate that about 1 log(10) of VLPs was depurated after 1 week in warm seawater (22 degrees C). Phage MS2 was depurated more rapidly (about 2 log(10) in 1 week) than were VLPs, as determined using a single-compartment model and linear regression analysis. After being relayed in the estuary under the influence of the tides, VLPs were detected in oysters for up to 82 days following seeding with high levels of VLPs (concentration range between 10(10) and 10(9) particles per g of pancreatic tissue)...
Tipo: Text Palavras-chave: Seawater; Viral diseases; Bioaccumulation; Depuration; Contamination; Model; Pancreas; Regression analysis; Shellfish; Phages; Virus.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-1233.pdf
Imagem não selecionada

Imprime registro no formato completo
The determination of total dissolved free primary amines in seawater: Critical factors, optimized procedure and artefact correction ArchiMer
Aminot, Alain; Kerouel, Roger.
The paper reviews the methods described in the literature for the determination of total dissolved free primary amines (TDFPA) by fluorescence. A wide set of reaction conditions can be found, but they rely on few experiments for their validation. Among fluorogenic compounds, o-plithaldialdehyde (OPA) is more sensitive than fluorescamine and was thus examined here. However, the use of mercaptoethanol (ME) in the reaction (as ail additional derivatization compound) is able to generate unreliable results, in particular when standardization relies on glycine. We suggest replacing ME with 3-mercaptopropionic acid (MPA) which induces more stable and comparable fluorescence among amine Compounds. A systematic study was therefore undertaken to define reagent...
Tipo: Text Palavras-chave: Fluorescence; Determination; Seawater; Total dissolved free primary amines.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2274.pdf
Registros recuperados: 62
Primeira ... 1234 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional