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Registros recuperados: 35
Primeira ... 12 ... Última
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A case study of ships forming and not forming tracks in moderately polluted clouds OMA
Noone, K.J.; Öström, E.; Ferek, R.J.; Garrett, T.; Hobbs, P.V.; Johnson, D.W.; Taylor, J.P.; Russell, L.M.; Flagan, R.C.; Seinfeld, J.H.; O'Dowd, C.D.; Smith, M.H.; Durkee, P.A.; Nielsen, K.; Hudson, J.G.; Pockalny, R.A.; De Bock, L.; Van Grieken, R.E.; Gasparovic, R.F.; Brooks, I..
The effects of anthropogenic particulate emissions from ships on the radiative, microphysical, and chemical properties of m(oderately polluted marine stratiform clouds are examined. A case study of two ships in the same air mass is presented where one of the vessels caused a discernible ship track while the other did not. <i>In situ</i> measurements of cloud droplet size distributions, liquid water content, and cloud radiative properties, as well as aerosol size distributions (outside cloud, interstitial, and cloud droplet residual particles) and aerosol chemistry, are presented. These are related to measurements of cloud radiative properties. The differences between the aerosol in the two ship plumes are discussed; these indicate that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerosols; Air pollution; Albedo; Anthropogenic factors; Atmospheric boundary layer; Atmospheric particulates; Chemical plumes; Cloud physics; Clouds; Droplets; Fuels; Ocean-atmosphere system; Pollution effects; Radiative transfer; Ships; Size distribution.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8840
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Caracterización de la calidad de las aguas y sedimentos del Río Atacames 2002 OceanDocs
Rodríguez de Morán, A..
La presente investigación se desarrolló como parte de Estudio de calidad de las aguas de los ríos de la Provincia de Esmeraldas durante mayo del 2002, como aporte del INOCAR a la Ilustre Municipalidad del Cantón Atacames, Institución que se encuentra realizando esfuerzos en los planes de operación para cumplir con la concepción del estado ecuatoriano sobre protección ambiental. Se presenta y evalúa los resultados obtenidos tanto en el estudio de calidad de las aguas como de los sedimentos del río Atacames en la Provincia de Esmeraldas, tomando en consideración la distribución y comportamiento superficial de parámetros físico, químicos y microbiológicos en un área que abarca entre 15 kilómetros aguas arriba y su desembocadura en el Océano Pacífico. Durante...
Tipo: Journal Contribution Palavras-chave: Water quality; River water; Sediments; Oxygen; Petroleum hydrocarbons; Microbial contamination; Pollution effects; Organic wastes; Sewage; Water quality; Microbial contamination; Organic wastes; Oxygen; Sewage; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_37547; Http://aims.fao.org/aos/agrovoc/c_35237; Http://aims.fao.org/aos/agrovoc/c_5477; Http://aims.fao.org/aos/agrovoc/c_7007.
Ano: 2003 URL: http://hdl.handle.net/1834/2373
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Distribution quantitative de la meiofaune dans un milieu fortement anthropise : le vieux port de Bizerte (Tunisie) OceanDocs
Essid, N.; Mahmoudi, E.; Beyrem, H.; Aissa, P.; Hedfi, A..
The survey of sediment and hydrological parameters in the old harbor of Bizerte has revealed that this ecosystem knows a high anthropogenic pressure. In this area waters were characterized by weak contents in dissolved oxygen and sediments, rich in fine fraction, were loaded in hydrocarbons and in organic matter. The free-living nematodes, predominant taxa, responded to these disturbances by a significant decrease in their densities and their biomasses and had tendency, notably at the most isolated sites, to penetrate deeply to escape surface sediments highly loaded in hydrocarbons and in organic matter.
Tipo: Journal Contribution Palavras-chave: Hydrocarbons; Pollution effects; Pollution indicators; Meiobenthos; Harbours; Man-induced effects; Bioindicators; Hydrocarbons; Http://aims.fao.org/aos/agrovoc/c_3719.
Ano: 2003 URL: http://hdl.handle.net/1834/1115
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Diversidad de peces demersales en la plataforma continental del Ecuador OceanDocs
Moncayo, D.; Trejos, R.; Maridueña, A.; Castro, R..
Se determine el contenido de Mercurio (Hg), Cadmio (Cd) y Plomo (Pb) en 18363 muestras de productos pesqueros colectadas durante el período enero del 2006 hasta julio del 2009. La determinación fue realizada empleando espectrofotometría de Absorción Atómica por generación de vapor frío (Hg) y horno de grafito (Cd y Pb), todas las concentraciones son expresadas en peso húmedo. Los análisis fueron realizados con el propósito de verificar que los productos pesqueros a ser exportados cumplen con los niveles establecidos en el Reglamento consolidado (CE)N°1881/2006, de la Unión Europea, que fija el conte¬nido máximo de determinados contaminantes en los productos alimenticios. Las concentraciones encontradas, en las muestras de peces, en su mayoría fueron...
Tipo: Journal Contribution Palavras-chave: Heavy metals; Atomic absorption spectroscopy; Bioaccumulation; Pollution effects; Fishery products.
Ano: 2010 URL: http://hdl.handle.net/1834/4802
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Effect of xanthan on the growth of sulphate-reduction bacteria in marine sediments. ArchiMer
Battersby, N; Stewart, D; Sharma, A.
Chemical additives are used extensively in the offshore oil industry. For secondary oil recovery, the biopolymer xanthan has been recommended as a viscosifying agent but its use may provoke microbial problems. The effect of adding xanthan to marine sediments on the growth and metabolic activity of sulphate-reducing bacteria (SRB) was studied. In all instances, its addition resulted in an increasing in SRB numbers of up to 250-fold. This was accompanied by a marked increase in the electron transport activity of the sediments when these were incubated under either aerobic or anaerobic conditions. The products formed as a result of the biodegradation of the polymer by indigenous heterotrophic bacteria in these sediments appear to have acted as suitable...
Tipo: Text Palavras-chave: Bacteria; Growth; Additives; Pollution effects; Oil recovery; Biodegradation; Polymers; Sediment pollution; Sulfate reduction.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1015.pdf
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Effects of physical mixing on the environment of satellite lakes and dams of lake Victoria, Kenya OceanDocs
Guya, F.; Wakwabi, E.; Jembe, T.; Osumo, W.; Sitoki, L.; Ogutu, Z..
In the Lake Victoria (Kenya) catchment are found several small lakes and dams. The satellite lakes and dams are important aquifers and buffer zones for the lake. Besides the water bodies are important water sources both for livestock and domestic use. A study conducted in the water bodies between January 2003 and December 2004 showed that effects of eutrophication are wide spread in the lakes and dams. An investigation of primary productivity and effects of physical mixing and material transport was done. In Lake Sare, Lake Victoria waters are transported to the satellite lake during both day and night through Goye causeway that connects the two. The water bodies have higher rates of primary productivity than Lake Victoria. Spatial extent of oxygen...
Tipo: Proceedings Paper Palavras-chave: Dams; Eutrophication; Water reservoirs; Inland waters; Water bodies; Eutrophication; Primary production; Lake basins; Water mixing; Artificial lakes; Oxygen depletion; Endemic species; Pollution effects; Eutrophication; Dams; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_2121.
Ano: 2006 URL: http://hdl.handle.net/1834/1494
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Etude quantitative et qualitative des métallothioneines chez la daurade "Sparus aurata" exposée aux métaux lourds OceanDocs
Ameur, S.; Ghedira, J.; Guerbej, H.; Jebali, J.; Bouraoui, J.; Boussetta, H..
Dans l’environnement marin, les éléments traces peuvent s’accumuler dans les organismes à des concentrations supérieures à celles présentes dans l’eau. L’étude de la distribution tissulaire des métaux traces au niveau des organismes qui y sont exposés, constitue un aspect très important pour la compréhension de leur devenir. En outre, le suivi de la réponse biologique spécifique de ces organismes sentinelles aux xénobiotiques complète et consolide l’analyse chimique. Ce travail vise à étudier la distribution tissulaire des métaux traces et des métallothionéines (MTs) chez la daurade «Sparus aurata » traitée par un métal essentiel (le cuivre) et un métal non essentiel (le cadmium) à une concentration de 500µg /Kg de poids frais pendant 48 heures....
Tipo: Journal Contribution Palavras-chave: Animal organs; Bioaccumulation; Cadmium; Gills; Heavy metals; Metals; Pollutants; Pollution effects; Sediment pollution; Toxicity tests; Trace metals; Marine sciences; Biomarkers of exposure (organisms); Metallic elements.
Ano: 2009 URL: http://hdl.handle.net/1834/4448
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Evaluation des Risques dus a l'emploi des Peintures Anti-Salissures Dansales Zones Conchylicoles. ArchiMer
Alzieu, Claude; Thibaud, Yves; Heral, Maurice; Boutier, Bernard.
The boats cruising in the oyster growing areas are protected against biofouling by paints which release toxic compounds such as copper oxide and organotins into the water. After an estimation of the inputs of copper and organotins in the "Marennes-Oleron", Arcachon (Atlantic) and Thau (Mediterranean Sea) areas, their influence on larval fixation is discussed, taking into account the tributyltin toxicity against D larvae of Crassostrea gigas. Laboratory experiments have demonstrated that tributyltin produces morphological abnormalities of the shell and increases tin levels in tissues, interfering with copper and zinc metabolism. The influence of yacht ports on oyster growth and shell morphology, has been demonstrated in the field. The use of...
Tipo: Text Palavras-chave: Crassostrea gigas; Oyster culture; Abnormalities; Shells; Growth; Paints; Antifouling substances; Pollution effects.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1905.pdf
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Heavy metals effect on bacterial communities from coastal sediments. ArchiMer
Modamio, X; Mallo, S.
The effects of heavy metals on bacterial communities of sea sediments are studied. Samples were taken from a very polluted zone near Barcelona. Bacterial populations were estimated by the plate count method, using culture medium amended with heavy metals (Hg, Cd, Cr and Cu). The authors have also made a numerical taxonomy study with a hundred resistant strains, using 129 unit characters.
Tipo: Text Palavras-chave: Microorganisms; Marine environment; Toxicity; Bacteria; Numerical taxonomy; Sediment pollution; Pollution effects; Heavy metals.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1013.pdf
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Impact du milieu sur les nourricieres de poissons plats de la Baie de Seine ArchiMer
Duval, P.
This study has two objectives: (1) the knowledge of spatial and temporal characteristics of flat fish nursery grounds, and, (2) the determination of natural or man-induced factors affecting these nurseries: hydrodynamics, sediment properties, predation, competition, water quality, pollution. To protect these grounds the author proposes a fisheries management plan and an impact study before all port installations or all coastal equipment use.
Tipo: Text Palavras-chave: Resource conservation; Predation; Juveniles; Flatfish fisheries; Pollution effects; Environmental impact; Estuarine fisheries; Nursery grounds.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1321.pdf
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Impact d'un lubrifiant minéral sur la structure trophique des peupelements de nématodes libres marins de la lagune de Ghar El Melh : Etude microcosmique OceanDocs
Aissa, P.; Soltani, A.; Mahmoudi, E.; Louati, H.; Beyrem, H..
Une étude microcosmique a été effectuée pour examiner l’influence d’un lubrifiant minéral avant et après son utilisation dans un moteur de véhicule sur la structure trophique de la communauté de nématodes libres originaire de la lagune de Ghar El Melh. Une concentration de 1mg kg-1 de sédiment a été testée pour évaluer l’effet du polluant après 40 jours d’exposition. Les résultats de l’étude ont révélé que les consommateurs non sélectifs (1B), les plus abondants dans le microcosme témoin, ont été très affectés et leur dominance a diminué significativement sous l’effet de la contamination par le lubrifiant minéral avant ou après usage. Les détritivores sélectifs (1A) dont la dominance augmente significativement au iveau des microcosmes traités avec le...
Tipo: Journal Contribution Palavras-chave: Microcosms; Oil pollution; Petroleum; Pollution effects; Sediments; Trophic structure.
Ano: 2008 URL: http://hdl.handle.net/1834/4255
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Impact d’un lubrifiant minéral sur la structure trophique des peuplements de nématodes libres marins de la lagune de Ghar el Melh: Etude microcosmique OceanDocs
Louati, H.; Soltani, A.; Beyrem, H.; Aissa, P.; Mahmoudi, E..
Une étude microcosmique a été effectuée pour examiner l’influence d’un lubrifiant minéral avant et après son utilisation dans un moteur de véhicule sur la structure trophique de la communauté de nématodes libres originaire de la lagune de Ghar El Melh. Une concentration de 1mg kg-1 de sédiment a été testée pour évaluer l’effet du polluant après 40 jours d’exposition. Les résultats de l’étude ont révélé que les consommateurs non sélectifs (1B), les plus abondants dans le microcosme témoin, ont été très affectés et leur dominance a diminué significativement sous l’effet de la contamination par le lubrifiant minéral avant ou après usage. Les détritivores sélectifs (1A) dont la dominance augmente significativement au iveau des microcosmes traités avec le...
Tipo: Journal Contribution Palavras-chave: Microcosms; Oil pollution; Petroleum; Pollution effects; Sediments; Trophic structure; Petroleum; Http://aims.fao.org/aos/agrovoc/c_5747.
Ano: 2008 URL: http://hdl.handle.net/1834/3754
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Implantation et survie de Campylobacter jejuni/coli chez la moule Mytilus edulis ArchiMer
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
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Influence de la Chloration sur les Premiers Stades Larvaires de Palaemon serratus (Pennant). ArchiMer
Lassus, Patrick; Maggi, Pierre; Le Baut, Claire; Bardouil, Michèle; Bocquene, Gilles; Le Dean, Loïc; Truquet, Philippe.
In order to estimate the effects of chlorine used in cooling systems of electric power plants on zooplankton, some experiments have been realized with the four first larval stages of the prawn (P. serratus Pennant). Chlorine injection was performed by constant adding at 16 and 20 degree C with times exposures of 5, 15 and 25 minutes. If there is no detectable variations in sensitivity of different stages, toxic effects of oxydants issued from chlorination can be observed (for both the two acclimatation temperatures) at 15 minutes exposure with a LD 50 : 32 mg/l of chlorine.
Tipo: Text Palavras-chave: Palaemon serratus; Pollution effects; Larval development; Chlorine; Toxicity.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-1886.pdf
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Influence des Peintures Antisalissures a Base d'Organostanniques sur la Calcification de la Coquille de l'Huitre Crassostrea gigas. ArchiMer
Alzieu, Claude; Heral, Maurice; Thibaud, Yves; Dardignac, Marie-jose; Feuillet, Michèle.
Experiments in oyster-breeding areas where oyster Crassostrea gigas suffers from anomalies of calcification, show an obvious correlation between the importance of the malformation of shells and the vicinity of port areas where a great number of boats usually stay. Organotin compounds contained in antifouling paints, and more precisely Tributyltin fluoride (TBTF) induce, in experimental environment, similar anomalies to those observed in natural environment. The amounts of total tin in the tissues of oysters living in the vicinity of spots where organotin products are brought in, can reach high values, though they appear to decrease rapidly whereas the environmental contamination lessens. The authors suggest that results of organotin upon the mechanisms of...
Tipo: Text Palavras-chave: Crassostrea gigas; Pollution effects; Toxicity; Calcification; Fouling control; Paints.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-1898.pdf
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Influence d'une pollution chimique par l'apatite sur les peuplements bacteriens du golfe d'Aqaba (Jordanie) ArchiMer
Vacelet, E.
The influence of spillage of phosphates on the bacterial population and its activity was found to be not significant (on total number) or significant but low (on the number of growing cells which was higher close to the loading area). Phosphate discharge resulted also in a significant increase of dividing cells and of enzymatic activity but its effects could be hardly separated from sewage effects. Neither solubilizing strains nor bacterial solubilization could be detected.
Tipo: Text Palavras-chave: Bacteria; Apatite; Pollution effects; Phosphates; Chemical pollution.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1010.pdf
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Integrated indicator framework and methodology for monitoring and assessment of hazardous substances and their effects in the marine environment ArchiMer
Vethaak, A. Dick; Davies, Ian M.; Thain, John E.; Gubbins, Matthew J.; Martinez-gomez, Concepcion; Robinson, Craig D.; Moffat, Colin F.; Burgeot, Thierry; Maes, Thomas; Wosniok, Werner; Giltrap, Michelle; Lang, Thomas; Hylland, Ketil.
Many maritime countries in Europe have implemented marine environmental monitoring programmes which include the measurement of chemical contaminants and related biological effects. How best to integrate data obtained in these two types of monitoring into meaningful assessments has been the subject of recent efforts by the International Council for Exploration of the Sea (ICES) Expert Groups. Work within these groups has concentrated on defining a core set of chemical and biological endpoints that can be used across maritime areas, defining confounding factors, supporting parameters and protocols for measurement. The framework comprised markers for concentrations of, exposure to and effects from, contaminants. Most importantly, assessment criteria for...
Tipo: Text Palavras-chave: Chemical measurements; Biomarker; Bioassay; Pollution effects; Biomonitoring; Environmental; Impact; MSFD; ICES; OSPAR.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00283/39429/37869.pdf
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Interet de la microscopie analytique pour l''etude d''impact de metaux traces et de terres rares sur le milieu vivant. Application a l''etude d''une zone polluee: La Baie de Seine ArchiMer
Chassard Bouchaud, C; Noel, Philippe; Hubert, M; Hallegot, P.
To study bioaccumulation and metabolism of trace metals (silver-lead-copper-iron-uranium) and rare earths (lanthanium) in estuarine organisms (Crangon crangon, Mytilus edulis, Abra Alba, Cutellus pellucidus, Owenia furiformis ) the authors use in situ microanalysis associated with electronic or photonic microscopy.
Tipo: Text Palavras-chave: Rare earths; Trace metals; Bioaccumulation; Pollution effects; Microscopy.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1305.pdf
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Investigation on possible chemical pollution of the BouGhraa lagoon south of Tunisia by chemical wastes OceanDocs
Farhat, F.; Ben Aoun, Z.; Chouba, L.; Hadj Ali, M. S..
La mer de BouGhrara, un milieu quasi-lagunaire de cinquante milles hectares environ, a contribué d’une manière remarquable à la production halieutique Tunisienne jusqu’au 1992 4.786 tonnes, année à partir de laquelle cette production n’a cessé de décroître (1.118 tonnes en 2002). Par ailleurs le premier projet industriel d’aquaculture marine y a également vu le jour, atteignant une production aquacole en cages flottantes de 252 tonnes en 1990. Malheureusement cette activité a cessé en 1995, après une dizaine d’années et la société qui assurait cette production a cessé ses activités et les quelques cages ont été déplacées de la lagune vers le bassin du port de Zarzis à la recherche de conditions environnementales meilleures. Plusieurs raisons ont été...
Tipo: Journal Contribution Palavras-chave: Chemical pollution; Depletion; Eutrophication; Lagoon fisheries; Organic matter; Pollution effects; Salinity; Temperature; Waste disposal; Acidity.
Ano: 2007 URL: http://hdl.handle.net/1834/4249
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La Baie de Seine: Peuplements et especes benthiques en regime perturbe ArchiMer
Cabioch, L; Retiere, C.
The waters of the Seine River are polluted by urban, industrial and agricultural effluents. In addition direct industrial wastes inputs are emptied into the estuary. Within the limits of the Seine Bay program it was not possible to research pollution impacts on every estuarine ecosystem link; so only benthos have been studied. To take time response of organisms into account, the authors have defined indicators or quantitative evaluation of parameters, reflecting physiological state. They have studied population fluctuations caused by natural or man induced effects.
Tipo: Text Palavras-chave: Hydrodynamics; Population dynamics; Population structure; Bioaccumulation; Pollution effects; Marine pollution; Ecosystem disturbance; Benthos.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1304.pdf
Registros recuperados: 35
Primeira ... 12 ... Última
 

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