Consulta: subjectFacets:"Metals"
Registros recuperados: 48
Data/hora: 12/06/2024 01:12:44

Respuesta de la simbiosis tripartita Rhizobium-Leguminosa-Micorriza arbuscular ante vanadio y níquel.
Provedor de dados: 32
Autores: Vidal Fernández, Judith Estela.
Este trabajo evaluó la respuesta de la simbiosis tripartita Rhizobium-leguminosa-micorriza arbuscular en presencia de vanadio (V) y níquel (Ni). El trabajo se dividió en dos fases experimentales; la primera fase estudió el comportamiento de la simbiosis Rhizobium tropici-Phaseolus vulgaris ante concentraciones de V o Ni (0, 25, 50, 75, 100 y 120 mg L-1) y su efecto en el contenido elemental en nódulos, en un sistema de bolsa de crecimiento bajo condiciones controladas (25°C, 70% HR y 12h de fotoperiodo) durante 30 días. En las plantas con V, la nodulación inició al cuarto día después de la inoculación y tuvo un máximo de 40 nódulos por planta en el testigo y 6 nódulos en las concentraciones de 50 y 100 mg L-1. La mayor actividad nitrogenasa (AN) se...
Palavras-chave: Nodulación; Metales; Fitorremediación; Simbiosis; Phaseolus; Rhizophagus; Nodulation; Metals; Phytorremediation; Symbiosis; Edafología; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/753

Dissolved and particulate metals (Fe, Zn, Cu, Cd, Pb) in two habitats from an active hydrothermal field on the EPR at 13 degrees N
Provedor de dados: 5
Autores: Sarradin, Pierre-marie; Lannuzel, D; Waeles, M; Crassous, Philippe; Le Bris, Nadine; Caprais, Jean-claude; Fouquet, Yves; Fabri, Marie-claire; Riso, R.
The distribution of Fe, Cu, Zn, Pb, Cd between the dissolved (&lt;2 mu m) and the particulate (&gt;2 mu m) fractions was measured after in-situ filtration in two hydrothermal habitats. The total metal concentration ranges exhibit a clear enrichment compared with the seawater concentration, accounting for the hydrothermal input for all the metals considered. Iron is the predominant metal (5-50 mu M) followed by Zn and Cu. Cd and Pb are present at the nM level. At the scale studied, the behavior of temperature, pH and dissolved iron is semi-conservative whereas the other dissolved and particulate metals are characterized by non-conservative patterns. The metal enrichment of the &gt;2 mu m fraction results from the settlement and accumulation of particulate...
Tipo: Text
Palavras-chave: Hydrothermal fauna; Habitats; Particulate; Dissolved; Metals.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3830.pdf

L'utilisation des échantillonneurs passifs. Une nouvelle méthode pour évaluer la contamination chimique des masses d'eau
Provedor de dados: 5
Autores: Gourlay, Catherine; Gonzalez, Jean-louis.
The Water European Framework Directive requires the implementation of programs to monitor the chemical quality of water bodies (freshwater, transition water and seawater), based on grab measurements of concentrations of various contaminants (metals, organic compounds). The results are limited by several analytical difficulties, and the poor representativity because of the temporal variability of contamination. The passive sampling techniques, which basically consist of concentrating substances on a submerged device for a given period, and analyzing accumulated substances, should improve the monitoring, by simplifying analytical issues (lower detection limits, analysis in a simpler matrix), and allowing time integration of the contamination. Here, we...
Tipo: Text
Palavras-chave: Échantillonneurs passifs; Eau; Membrane semi-perméable (SPMD); Gradient de diffusion en couche mince (DGT); Métaux; HAP; Passive samplers; Water; Semipermeable membrane device (SPMD); Diffusive gradient in thin film (DGT); Metals; PAHs.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00077/18850/16423.pdf

Mineral and organic soluble forms of zinc, iron and copper: Distribution in the Seine Estuary.
Provedor de dados: 5
Autores: Gandon, R; Guegueniat, P; Fischer, J; Wartel, M.
One characteristic of the Seine Estuary system is the process of sediment resuspension by the specific hydrodynamics of this environment. It's the main factor of trace metals transport. Autotrophic activities also have an effect on the estuary, by pH variation. The behavior of soluble and organic copper, iron, have been studied in relation to salinity in and out of the estuary. The results are compared with those of other estuaries.
Tipo: Text
Palavras-chave: Hydrodynamics; Physicochemical properties; Water properties; Dissolved organic matter; Biogeochemical cycle; Resuspension; Metals; Suspended particulate matter.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1300.pdf

Relationship between the occurrence of filamentous bacteria on Bathymodiolus azoricus shell and the physiological and toxicological status of the vent mussel
Provedor de dados: 5
Autores: Martins, I.; Colaco, A.; Santos, Raphael; Lesongeur, Francoise; Godfroy, Anne; Sarradin, Pierre-marie; Cosson, R. P.
The edifice walls of the Eiffel Tower hydrothermal vent site (Mid-Atlantic Ridge, Lucky Strike vent field) are populated with dense communities of dual symbioses harboring vent mussel Bathymodiolus azoricus, some of which are covered by white filamentous mats belonging to sulfur-oxidizing bacteria. Mussels were collected in both the presence and absence of the filamentous bacteria. A sample of the filamentous bacteria was collected and water measurements of temperature, CH4 and H2S were recorded at the collection area. The whole soft tissues were analyzed for total lipid, carbohydrate and total protein. Metallothioneins and metals (Cu, Fe and Zn) levels were determined in the major organs. The results showed no significant physiological and toxicological...
Tipo: Text
Palavras-chave: Vent mussel; Metals; Metallothioneins; Filamentous bacteria; Eiffel Tower; Biomarkers.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6821.pdf

Evaluation des effets délétères des métaux et des pesticides sur les gamètes et les premiers stades de développement de l’huître creuse, Crassostrea gigas : application à la problématique de la pollution du Bassin d’Arcachon
Provedor de dados: 5
Autores: Mai, Huong.
The coastal areas are subject to multiple anthropogenic pressures including chemical pollution that can pose a real risk to the sustainability of aquatic species. The Arcachon Bay, macrotidal lagoon located on the French Atlantic coast, is the important ecosystem for oyster farming. But for several years, the oyster farms face lower recruitment and high mortality of oyster spat. Chemical contamination of the environment as a factor that may contribute to the observed effects on oysters has so far not been investigated.The present thesis aimed at evaluating through different approaches, of the potential toxicity of heavy metals and pesticides representative of the Arcachon Bay contamination on the early life stages of the Pacific oyster, Crassostrea gigas....
Tipo: Text
Palavras-chave: Métaux; Huitre creuse; Test embryo-larvaire; Génotoxicité; Test de fertilité; Expression de gènes; Comet assay; Gene expression; Fertilization assay; Pesticides; Metals; Pacific oyster; Embryo-larvae toxicity assay.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00590/70183/68199.pdf

Spatial variation of metal bioaccumulation in the hydrothermal vent mussel Bathymodiolus azoricus
Provedor de dados: 5
Autores: Cosson, R; Thiebaut, E; Company, R; Castrec Rouelle, M; Colaco, A; Martins, I; Sarradin, Pierre-marie; Bebianno, M.
The variability of the bioaccumulation of metals (Ag, Cd, Cu, Fe, Mn and Zn) was extensively studied in the mussel Bathymodiolus azoricus from five hydrothermal vent sites inside three main vent fields of increasing depth along the Mid-Atlantic Ridge: Menez Gwen, Lucky Strike and Rainbow. Metal bioaccumulation varied greatly between vent fields and even between sites inside a vent field with B. azoricus showing a great capacity to accumulate metals. The bioaccumulation of these metals also varied significantly among tissues. The main target was the gills where metals were mainly associated with soluble compounds whereas in the digestive gland they were mainly associated with insoluble compounds. Storage of metals under insoluble forms in B. azoricus seems...
Tipo: Text
Palavras-chave: Bathymodiolus; Mytilids; Hydrothermal vents; Azores; Metals; Bioaccumulation.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3954.pdf

TOPHYPAC. Tolérance des communautés phytoplanctoniques aux phytosanitaires dans le panache de la Charente. Programme Évaluation et réduction des risques liés à l’utilisation des Pesticides
Provedor de dados: 5
Autores: Stachowski-haberkorn, Sabine; Guesdon, Stephane; Bechemin, Christian; Chiffoleau, Jean-francois; Brach-papa, Christophe; Soudant, Philippe; Beker, Beatriz; Jadas-hécart, Alain.
TOPHYPAC is a field study that was conducted in the Charente river estuary (Marennes-Oléron bay). The main goal was to assess the possible impact of chemical contamination with copper and pesticides on phytoplankton communities. Physical, chemical (nutrients, metals and pesticides) and biological (phytoplankton community) parameters were monitored in the field during three years, from 2011 to 2014. In 2012 and 2013, field sampling was coupled with experimental exposure of phytoplankton communities to copper and to an herbicide cocktail, after transportation to the lab: the effects were assessed using photosynthesis endpoint and cellular densities. TOPHYPAC allowed to set the framework of Charente estuary contamination with pesticides: herbicides glyphosate...
Tipo: Text
Palavras-chave: Continuum eau douce/eau côtière; Pesticides; Métaux; Communautés phytoplanctoniques; Efficacité de photosynthèse; PICT; Tolérance; Cytométrie en flux; Toxicité chronique; Freshwater/coastal water continuum; Pesticides; Metals; Phytoplankton communities; Photosynthesis efficiency; PICT; Tolerance; Flow cytometry; Chronic toxicity.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00300/41115/40289.pdf

Utilisation des métallothionéines comme biomarqueur de la contamination métallique : variabilité entre sites et organes chez l'huı̂tre Crassostrea gigas
Provedor de dados: 5
Autores: Geret, F; Cosson, Rp.
Heavy metals (Cd, Cu, Hg and Zn) and metallothionein levels were determined in oysters Crassostrea gigas from two sites: the Gironde Estuary (contaminated site) and Bourgneuf Bay (uncontaminated site). Metallothionein levels led us to suspect the presence of cadmium in the environment when quantified in the gills. Soluble cadmium and metallothioneins were positively correlated in the digestive gland of oysters from Gironde (contaminated site), but metallothionein levels in this organ were not significantly different from levels observed in the digestive gland of oysters from Bourgneuf Bay (uncontaminated site). Conversely, no correlation was noticed between metals and metallothioneins in the gills of oysters from Gironde despite metallothionein levels...
Tipo: Text
Palavras-chave: Métallothionéines; Métaux; Crassostrea gigas; Biomarqueur; Metallothioneins; Metals; Crassostrea gigas; Biomarker.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00324/43561/44058.pdf

Cellular and biochemical responses of the oyster Crassostrea gigas to controlled exposures to metals and Alexandrium minutum
Provedor de dados: 5
Autores: Haberkorn, Hansy; Lambert, Christophe; Le Goic, Nelly; Quere, Claudie; Bruneau, A; Riso, Ricardo; Auffret, Michel; Soudant, Philippe.
Effects of simultaneous exposure of Pacific oyster, Crassostrea gigas, to both a harmful dinoflagellate that produces Paralytic Shellfish Toxins (PST), Alexandrium minutum, and cadmium (Cd) and copper (Cu), were assessed. Oysters were exposed to a mix of Cd-Cu with two different diets (i.e. A. minutum or Tisochrysis lutea) and compared to control oysters fed A. minutum or T. lutea, respectively, without metal addition. Metals and PST accumulations, digestive gland lipid composition, and cellular and biochemical hemolymph variables were measured after 4 days of exposure. Oysters exposed to Cd-Cu accumulated about thirty-six times less PSTs than oysters exposed to A. minutum alone. Exposure to Cd-Cu induced significant changes in neutral lipids (increase in...
Tipo: Text
Palavras-chave: Harmful algae; Metals; Oysters; Toxin accumulation; Physiological effects.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00169/28071/26286.pdf

Relationship between metal levels in the vent mussel Bathymodiolus azoricus and local microhabitat chemical characteristics of Eiffel Tower (Lucky Strike)
Provedor de dados: 5
Autores: Martins, Ines; Cosson, Richard P.; Riou, Virginie; Sarradin, Pierre-marie; Sarrazin, Jozee; Santos, Ricardo S.; Colaco, Ana.
The turbulent mixing of hydrothermal hot fluid with cold seawater creates large chemical gradients at a small spatial scale that may induce variable physiological and biochemical adaptations within the vent fauna. The adaptation to such a variable environment by the vent mussel Bathymodiolus azoricus relies on a dual symbiosis hosted in the gills, and digestion of particulate organic matter. The surrounding environment not only provides the necessary energy sources and suspended organic particles for the vent mussel nutrition, but also potentially toxic compounds such as metals. Our main goal was to see if there is a relation between metal accumulation in mussel organs and the chemical characteristics of their close environment. Mussels were collected at...
Tipo: Text
Palavras-chave: Metals; Metallothioneins; Bathymodiolus azoricus; Hydrothermal vent; Environmental conditions; Physiological condition; Spatial distribution.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00030/14097/11327.pdf

Traitement par lagunage a haut rendement algal (LHRA) des effluents piscicoles marins recycles: évaluation chimique et écotoxicologique
Provedor de dados: 5
Autores: Deviller, Genevieve.
World aquaculture is a fast growing activity and the control of its waste becomes a key issue. Compared to traditional systems, recirculating systems allow to reduce replacement water and waste volumes. Nevertheless their effluents are more concentrated in dissolved nutrients (nitrate, phosphate). The high rate algae pond (HRAP) is one of the possible treatment technique to remove those nutrients. During this work, three rearing systems: one recycled, one recycled with HRAP and one open as a standard, were operated for one year to assess the impact of: (1) the reuse of treated effluent on survival, growth and nutrition of sea bass (2) the rearing system on fish health using multibiomarkers and trace metals accumulation responses and (3) best conditions for...
Tipo: Text
Palavras-chave: Aquaculture; Fish; Growth; Metals; Biomarker; Water treatment; Recirculating effluent; High rate algal pond; Aquaculture; Poisson; Croissance; Métaux; Biomarqueur; Epuration; Effluent recyclé; Lagunage à haut rendement algal.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2004/these-163.pdf

Evolution de la complexation des metaux (Ca, Mg, Cd, Pb et Cu) dans l''estuaire de la Seine
Provedor de dados: 5
Autores: Fischer, J; Wartel, M.
Interaction between metallic ions and dissolved organic matter can take major part in the biogeochemical cycle of metals in the aquatic environment. The authors point out copper behavior by the study of complexing capacity of surface and bottom waters. A systematic analysis of major elements in natural waters has allowed for a proposal of geographical distribution of metals.
Tipo: Text
Palavras-chave: River plumes; Dissolved organic matter; Chemical reactions; Salinity; Biogeochemical cycle; Metals; Ion association; Water properties.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1299.pdf

Distribution and behavior of dissolved hydrogen sulfide in hydrothermal plumes
Provedor de dados: 5
Autores: Radford Knoery, Joel; German, C; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves.
Through the deep ocean, hydrothermal plumes disperse high concentrations of key chemical tracers including He-3, CH4, Mn, Fe, H2S, etc. This paper focuses on the distribution and behavior of total dissolved sulfide (sulfide hereafter) in hydrothermal plumes to show that its plume concentration decreases to subnanomolar a few kilometers from the vents. We also report on sulfide removal rates determined at in situ conditions; we observe that they are two orders of magnitude greater than for open ocean seawater, consistent with sulfide being detected only in the vicinity of hydrothermal vents. From our observations, we infer that the sole presence of sulfide in hydrothermal plumes locates active venting at the kilometer scale.
Tipo: Text
Palavras-chave: Chemical oceanography; Mid ocean ridges; Metals; Helium isotopes; Methane; Tracers; Hydrogen sulphide; Plumes; Hydrothermal activity.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/2001/publication-688.pdf

Influence hydrothermale dans les sédiments de fosses de la mer Rouge par l'étude de quelques éléments traces
Provedor de dados: 5
Autores: Pierret, Marie Claire; Clauer, Norbert; Blanc, Gerard.
The Cu, Ni, Fe, Cr and Zr concentrations were evaluated to study the influence of hydrothermal activity on the sediments of six Red-Sea deeps. Comparison between the Ni/Fe and Cu/Fe ratios supports distinction between hydrothermal and non-hydrothermal sediments, whereas anti-correlation between Zr and Cr concentrations results from hydrothermal influence. The results allow us to envisage that the sediments of the Suakin Deep did not undergo a hydrothermal activity and that this hydrothermal influence was weak in the Valdivia Deep. The sediments of Port-Soudan Deep recorded a hydrothermal activity, whereas this activity was the strongest in the Thetis and Atlantis II deeps.
Tipo: Text
Palavras-chave: Sédiment; Mer Rouge; Fosses; Hydrothermalisme; Métaux; Sediment; Red sea; Deeps; Hydrothermalism; Metals.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43375/42836.pdf

L'arsenic en milieu marin: Synthese bibliographique
Provedor de dados: 5
Autores: Michel, Pierre.
Arsenic is an important element in marine environment due to its level 1,000 times higher that of mercury and its behavior close to that of  phosphorus. This overview recalls few chemical and biochemical basis and presents the current state of knowledge about its sources, concentration levels in estuarine and oceanic waters, sediments and biota. Toxicity for species, ecosystems and consumers, and analytical methods for its control are approached.
Tipo: Text
Palavras-chave: Environmental impact; Literature reviews; Toxicity; Arsenic; Metals.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/publication-1779.pdf

METROC : évaluation des apports de contaminants chimiques de la métropole marseillaise au milieu marin
Provedor de dados: 5
Autores: Jany, Cassandre; Zebracki, Mathilde.
METROC program (part of the MEDICIS program about study and fate of the chemical contamination in Western Mediterranean Sea) focuses on sources and wastes issued by large metropolis, with the agglomeration of Marseille as a pilot site. This report presents the results of a sampling campaign in rivers and urban discharges in Marseille and on different types of contaminants (metals, PAH, PCB and PBDE) in dissolved and particulate phases, in dry and rain periods. Results show that concentrations of pollutants are greater in Aygalades river (metals and organic contaminants) and in Emissaire 2, sewer overflows and torrents. From the results of the analysis and discharge given by the DEA, we estimated partially the flows of pollutants which show that the first...
Tipo: Text
Palavras-chave: Mer Méditerranée; Littoral; Apports urbains; Marseille; Contamination chimique; Métaux; HAP; PCB; PBDE; Concentrations; Mediterranean Sea; Coast; Urban waste; Marseilles; Chemical contamination; Metals; PAH; PCB; PBDE; Concentration.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00116/22692/20431.pdf

Pouvoir complexant des eaux de l'estuaire de la Seine
Provedor de dados: 5
Autores: Fischer, J; Wartel, M; Guegueniat, P; Gandon, R.
Copper has been studied, by the authors, owing to its ability to complex with various organic ligands of natural waters. Metals extraction and liberation can be explained, in part, by this complexing capacity.
Tipo: Text
Palavras-chave: Estuaries; Suspended particulate matter; Dissolved organic matter; Copper; River discharge; Ion association; Metals; Biogeochemical cycle; Water properties.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1298.pdf

Metal bioaccumulation and storage forms in the shrimp, Rimicaris exoculata, from the Rainbow hydrothermal field (Mid-Atlantic Ridge); preliminary approach to the fluid-organism relationship
Provedor de dados: 5
Autores: Geret, Florence; Riso, Ricardo; Sarradin, Pierre-marie; Caprais, Jean-claude; Cosson, Richard P.
At the Rainbow hydrothermal site the concentrations of metals in the fluid are the highest observed in the Mid-Atlantic Ridge hydrothermal areas, and the shrimps Rimicaris exoculata were observed forming dense swarms in small depressions on the chimney walls. In order to understand the fluid-organism relationship, we investigated the relative abundance of metals in the water surrounding R. exoculata and their bioaccumulation by the shrimps. This first approach stresses a net metal enrichment around R. exoculata. Precipitation, scavenging and oxidative redissolution processes in the mixing zone are controlling the concentrations of metals. Their bioaccumulation varies according to their bioavailability in the surrounding water. Metals are abundant as...
Tipo: Text
Palavras-chave: Hydrothermal fluid; Rimicaris exoculata; Metals; Bioaccumulation; Rainbow.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00186/29762/28204.pdf

Metal concentrations in sediment and Nereis diversicolor in two Moroccan lagoons: Khnifiss and Oualidia
Provedor de dados: 5
Autores: Idardare, Zaina; Chiffoleau, Jean-francois; Moukrim, A; Alla, A; Auger, Dominique; Lefrere, L; Rozuel, Emmanuelle.
Metal concentrations were measured monthly during an annual cycle (December 2004 to January 2006) in the tissues of Nereis diversicolor ragworms and sediment from two Moroccan Atlantic coastal lagoons: Oualidia in the north, situated in a highly industrialised urban area and Khnifiss in the south, far from anthropogenic influences. Relatively high levels of Zn, Ag and Cd were found in the sediment of Oualidia lagoon, while Ni concentrations were shown to be high at Khnifiss. The significant metal levels at Oualidia are a result of industrial and urban discharges, coupled with discharges from adjacent phosphate ore processing plants. Trace metal concentrations in worms vary according to season; they are usually high in winter and spring, in relation to the...
Tipo: Text
Palavras-chave: Morocco; Coastal lagoons; Sediments; Nereis diversicolor; Metals.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6127.pdf

Growth and metal uptake of microalgae produced using salt groundwaters from the Bay of Bourgneuf
Provedor de dados: 5
Autores: Gagneux Moreaux, Sindy; Cosson, Richard P.; Bustamante, Paco; Moreau, Christophe.
The Bay of Bourgneuf, France, is a main site of shellfish production. In the marshes along the bay, oyster intensive rearing and fattening need the mass production of microalgae. Salt groundwaters, available in this region, support a large part of this production for aquaculture. Studies carried out by local authorities have brought to the fore the accumulation of lead (Pb) in several samples of algal pastes derived from cultures using salt groundwater. The aim of this study was to compare growth, nutritional value and metal (Cd, Cu, Pb and Zn) uptake of four microalgae grown in two salt groundwaters or in enriched coastal seawater. Cultures of microalgae used in aquaculture (Haslea ostrearia, Phaeodactylum tricornutum, Skeletonema costatum and Tetraselmis...
Tipo: Text
Palavras-chave: Marine microalgae cultivation; Aquaculture; Metals; Growth; Prasinophycea; Bacillariophycea; Diatom; Bioaccumulation; Trace elements; Saline groundwater.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2135.pdf

Monitoring of trace metal contamination in the Souss estuary (South Morocco) using the clams Cerastoderma edule and Scrobicularia plana
Provedor de dados: 5
Autores: Anajjar, E; Chiffoleau, Jean-francois; Bergayou, H; Moukrim, A; Burgeot, Thierry; Cheggour, M.
Concentrations of seven metals (Cd, Cu, Cr, Pb, Ni, Zn, Hg) were monitored monthly during 2 years in two bivalves, Cerastoderma edule and Scrobicularia plana collected from the Souss estuary (South Morocco) before and after the commissioning of a sewage treatment plant in November 2002. According to trace metals, changes in concentrations were observed mainly in S. plana, characterised by a decrease of Cu, Hg and Pb when Cd was clearly increasing. Conversely, no clear changes were observed in C. edule during the same periods. This study suggests the use of S. plana in the monitoring of trace metal contamination of such coastal marine environments.
Tipo: Text
Palavras-chave: Monitoring; Waste water; Bivalves; Metals; South estuary.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4515.pdf

Metal and metalloid bioaccumulation in the Pacific blue shrimp Litopenaeus stylirostris (Stimpson) from New Caledonia: Laboratory and field studies
Provedor de dados: 5
Autores: Metian, Marc; Hedouin, Laetitia; Eltayeb, Mohamed M.; Lacoue-labarthe, Thomas; Teyssie, Jean-louis; Mugnier, Chantal; Bustamante, Paco; Warnau, Michel.
The present work aimed at better understanding metal and metalloid bioaccumulation in the edible Pacific blue shrimp Litopenaeus stylirostris, using both laboratory and field approaches. In the laboratory, the bioaccumulation kinetics of Ag, Cd, Co, Cr, and Zn have been investigated in shrimp exposed via seawater and food, using the corresponding gamma-emitting radiotracers (Ag-110m, Cd-109, Co-57, Cr-51, and Zn-65) and highly sensitive nuclear detection techniques. Results showed that hepatopancreas and intestine concentrated the metals to the highest extent among the blue shrimp organs and tissues. Moulting was found to play a non negligible detoxification role for Co, Cr and, to a lesser extent, Zn. Metal retention by L stylirostris widely varied (from...
Tipo: Text
Palavras-chave: Crustacean; Metals; Biokinetics; Radiotracers; Moulting; Contamination.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12528/9869.pdf

Inter-specific and ontogenic differences in delta C-13 and delta N-15 values and Hg and Cd concentrations in cephalopods
Provedor de dados: 5
Autores: Chouvelon, Tiphaine; Spitz, Jerome; Cherel, Y.; Caurant, Florence; Sirmel, R.; Mendez-fernandez, P.; Bustamante, Paco.
Chemical tracers (e. g. stable isotopes or trace metals) are increasingly used to study trophic ecology and feeding habits of marine organisms and various factors can affect their values. The aim of the present study was to provide information on ontogenic effects on stable carbon and nitrogen values (delta C-13 and delta N-15) and on cadmium (Cd) and mercury (Hg) concentrations in 5 cephalopod species from the Bay of Biscay (North-East Atlantic Ocean). To this end, individuals belonging to 3 species showing the widest range of sizes were analysed for muscle delta C-13 and delta N-15 values and muscle Hg, and digestive gland Cd concentrations. Results showed that stable isotope ratios allowed discrimination of specific feeding strategies during...
Tipo: Text
Palavras-chave: Stable isotopes; Metals; Trace elements; Ontogenesis; Prey; Ecological tracer; Northeastern Atlantic.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00166/27761/25938.pdf

In situ measurement with diffusive gradients in thin films: effect of biofouling in freshwater
Provedor de dados: 5
Autores: Uher, Emmanuelle; Compere, Chantal; Combe, Matthieu; Mazeas, Florence; Gourlay-france, Catherine.
Concerning in situ passive sampler deployment, several technical priorities must be considered. In particular, deployment time must be sufficiently long not only to allow a significant quantity to be accumulated to facilitate analysis but also to ensure that the signal is above the quantification limit and out of the blank influence. Moreover, regarding the diffusive gradient in thin films (DGT) technique, deployment time must also be sufficiently long (at least 5 days) to avoid the interactions of the solutes with the material diffusion layer of the DGT and for the steady state to be reached in the gel. However, biofouling occurs in situ and modifies the surface of the samplers. In this article, we propose a kinetic model which highlights the biofouling...
Tipo: Text
Palavras-chave: DGT; Metals; Biofouling; Seine River; Field deployment; Passive sampler.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00382/49330/49759.pdf

Bioaccumulation of trace elements in pelagic fish from the Western Indian Ocean
Provedor de dados: 5
Autores: Kojadinovic, Jessica; Potier, Michel; Le Corre, Matthieu; Cosson, Richard P.; Bustamante, Paco.
Trace elements were analyzed in fish of commercial interest to determine their importance in marine systems of the Western Indian Ocean and their bioaccumulation patterns. The results are equivalent or lower than levels reported in ichthyofauna worldwide. Certain values of muscular Cd, Hg, Pb and Zn were, however, above thresholds for human consumption. Levels varied among tissues, species and fish length, but were seldom influenced by the nutritional condition of the fish, its gender and its reproductive status. Correlations between hepatic Hg and Se levels in Swordfish (r(2) = 0.747) and Yellowfin Tunas (r(2) = 0.226), and among metallothionein linking metals imply the existence of detoxification processes in these species. Level differences between fish...
Tipo: Text
Palavras-chave: Guidelines; Detoxification; Contamination; Fish; Metals.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2490.pdf

Johann Jacob Scheuchzer (1672-1733) und die Alpenerforschung in der Schweiz – aus den Beständen der Eisenbibliothek
Provedor de dados: 16
Autores: Bouheiry, A.
A short introduction provides some information about the Iron Library, a foundation of Georg Fischer Ltd, at Schaffhausen, which was established in 1949, to enable scientists and students the study of its historic collection, which is mainly concentrated on mining and metals, but includes all other related fields. Some outstanding details about the collection will be presented. The main topic of the contribution will be the research of Johann Jacob Scheuchzer (1672-1733) in the Swiss Alps. His research interests were similar to those of the well known universal scientist Conrad Gessner (1516-1565) and Johann Jakob Wagner (1641-1695), considered to be pioneers of the Alpine research in Switzerland. It is followed by biographical statements about Johann...
Tipo: Article / Letter to the editor
Palavras-chave: Iron Libray; Scheuchzer; Alpine geology; Metals; 38.52.
Ano: 2004
URL: http://www.repository.naturalis.nl/record/215372

Metodología de bioensayos y efectos tóxicos de algunos contaminantes sobre organismos de interés ecológico pesquero
Provedor de dados: 20
Autores: Suárez Álvarez, G.
Este trabajo trata de presentar los efectos tóxicos de cuatro posibles contaminantes de la plataforma cubana, un plaguicida órgano clorado el DDT y 3 metales, el cromo, el cobre y el plomo, sobre postlarvas de langosta P. argus y el camarón P. notialis. Persiguiendo un triple propósito en sus objetivos, presentar de una forma cómoda, con fines didácticos la resolución de los tres métodos de trabajo adoptados internacionalmente para evaluar la toxicidad, el método gráfico semi logarítmico, rutinario o estándar, el método de los Probits de Bliss y la modificación de Licthfield y wilcoxon, así como analizar de dichas metodologías cual es la más adecuada para la evaluación de los efectos de cualquier contaminante con mayor precisión estadística y conocer los...
Tipo: Theses and Dissertations
Palavras-chave: Toxicity; Heavy metals; Metals; Toxicity; Heavy metals; Metals; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_29036.
Ano: 1996
URL: http://hdl.handle.net/1834/2610

Major controls of some metals distribution in sediments off the Nile Delta, Egypt
Provedor de dados: 20
Autores: Rifaat, A.E.
The sediment samples that are collected during R/V CHAIN 1975 cruise to the southeastern Mediterranean have been used to determine the major controls of metals’distribution. The sediment samples were analysed mineralogically, chemically and texturally. The parameters measured included carbonate minerals, total carbonate, organic carbon, iron, manganese, copper, zinc, chromium, lead, nickel, cobalt, vanadium, calcium, magnesium, strontium, sand, silt and clay. The statistical analysis of data showed that four major factors control the distribution of metals in sediments of the Nile cone; These are: Factor 1 terrigenous mud-calcareous sand; Factor 2 Aragonite mud-terrigenous sand; Factor 3 Algal sand; and Factor 4 Aragonite. The percentages of terrigenous...
Tipo: Journal Contribution
Palavras-chave: Sediment; Metals; Factor Analysis Coastal oceanography Sediments.
Ano: 2005
URL: http://hdl.handle.net/1834/1259

Etude quantitative et qualitative des métallothioneines chez la daurade "Sparus  aurata" exposée aux métaux lourds
Provedor de dados: 20
Autores: 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

Assessment of ammonia toxicity in contaminated sediments in the upper Scheldt (Belgium): the development and application of toxicity identification evaluation procedures
Provedor de dados: 27
Autores: Van Sprang, P.; Janssen, C.R.; Sabayasachi, M.; Benijts, F.; Persoone, G.
The toxicity of sediment pore waters from 4 sites in the Upper Scheldt war characterized using modified Toxicity Identification Evaluation (TIE) procedures The samples from all locations exhibited acute toxicity to the freshwater crustacean Thamnocephalus platyurus. The IIE approach was conducted using an enlarged battery of fractionation tests. Toxicity was removed or reduced significantly by the cation exchange resins and the air-stripping test at pH 11. Additionally, increased toxicity war observed at higher pH while a reduced toxicity war found at a decreased pH. From these TIE studies, ammonia war identified as the dominant toxic agent.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metals; River; Toxicants; Water.
Ano: 1996
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7459

Functionalized Charcoal as a Buffering Matrix of Copper and Zinc Availability
Provedor de dados: 90
Autores: Guimarães,Gelton Geraldo Fernandes; Giroto,Amanda Soares; Teixeira,Breno Cardoso; Vergütz,Leonardus; Cantarutti,Reinaldo Bertola.
ABSTRACT: High copper (Cu) and zinc (Zn) contents in soil can cause phytotoxicity to plants and contaminate surface and groundwater, with negative effects on agriculture and the environment. Functionalized charcoal (OCh) has high cation exchange capacity (CEC) and the ability to adsorb Cu and Zn and control their availability in the soil and water. An adsorption study at two pH levels was carried out to evaluate increasing Cu and Zn sorption capacity provided by the functionalization process of a charcoal. In addition, a kinetics study of competitive and non-competitive adsorption-desorption of Cu and Zn in OCh was also evaluated. The results showed that functionalized charcoal (Ch) increased CEC 8.7 times due to an increase in carboxyl and phenolic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorption; Desorption; Metals; Remediation; Biochar.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100530

Rare Earth Element Concentrations in Brazilian Benchmark Soils
Provedor de dados: 90
Autores: Silva,Ygor Jacques Agra Bezerra da; Nascimento,Clístenes Williams Araújo do; Silva,Yuri Jacques Agra Bezerra da; Biondi,Caroline Miranda; Silva,Cinthia Maria Cordeiro Atanázio Cruz.
ABSTRACT: Studies regarding background concentrations of rare earth elements (REEs) are scarce and have mainly focused on a limited number of soil types from the northern hemisphere. The aim of this study was to determine REE concentrations in thirty-five benchmark soils of Brazil. Composite soil samples were taken from areas under native vegetation or with minimal anthropogenic influence. Concentrations of La, Ce, Pr, Nd, Sm, Eu, Gd, Yb, Lu, Dy, Er, Ho, Tb, Tm, Y, Sc, and Fe were determined by ICP-OES using a cyclonic spray chamber/nebulizer system after microwave acid digestion. Results were assessed by descriptive statistics, Pearson correlation, and principal component analysis (PCA). Regression analyses among Fe, organic carbon, and REEs were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lanthanides; Scandium; Yttrium; Metals; Trace elements.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100548

Radionuclides and heavy metal contents in phosphogypsum samples in comparison to cerrado soils
Provedor de dados: 90
Autores: Jacomino,Vanusa Maria Feliciano; Oliveira,Kerley Alberto Pereira de; Taddei,Maria Helena Tirollo; Siqueira,Maria Célia; Carneiro,Maria Eleonora Deschamps Pires; Nascimento,Marcos Roberto Lopes; Silva,David Faria da; Mello,Jaime Wilson Vargas de.
Phosphogysum (PG) or agricultural gypsum, a solid waste from the phosphate fertilizer industry, is used as soil amendment, especially on soils in the Cerrado region, in Brazil. This material may however contain natural radionuclides and metals which can be transferred to soils, plants and water sources. This paper presents and discusses the results of physical and chemical analyses that characterized samples of PG and compares them to the results found in two typical soils of the Cerrado, a clayey and sandy one. These analyses included: solid waste classification, evaluation of organic matter content and of P, K, Ca, Mg, and Al concentrations and of the mineralogical composition. Natural radionuclides and metal concentrations in PG and soil samples were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphogysum; Soil fertility; Radionuclides; Metals; Contamination.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500038

Geochemistry of acid mine drainage from a coal mining area and processes controlling metal attenuation in stream waters, southern Brazil
Provedor de dados: 42
Autores: CAMPANER,VERIDIANA P.; LUIZ-SILVA,WANILSON; MACHADO,WILSON.
Acid drainage influence on the water and sediment quality was investigated in a coal mining area (southern Brazil). Mine drainage showed pH between 3.2 and 4.6 and elevated concentrations of sulfate, As and metals, of which, Fe, Mn and Zn exceeded the limits for the emission of effluents stated in the Brazilian legislation. Arsenic also exceeded the limit, but only slightly. Groundwater monitoring wells from active mines and tailings piles showed pH interval and chemical concentrations similar to those of mine drainage. However, the river and ground water samples of municipal public water supplies revealed a pH range from 7.2 to 7.5 and low chemical concentrations, although Cd concentration slightly exceeded the limit adopted by Brazilian legislation for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid mine drainage; Coal; Metals; Water quality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200539

Method validation for determination of metals in Vitis labrusca L. grapevine leaf extracts by inductively coupled plasma mass spectrometry (ICP-MS)
Provedor de dados: 42
Autores: BOKOWSKI,LIANE V.V.; SOBRINHO,ROBERTO B.; ARMIJO,CRISTIÁN J.V.; DANI,CAROLINE; HENRIQUES,JOÃO A.P.; FUNCHAL,CLÁUDIA.
ABSTRACT Vitis labrusca L. is the main species used for wine and juice production in Brazil. The grapevine leaves can be used both as functional foods and as cheapest sources for the extraction of phenolic compounds. Besides the antioxidant activity, grapevine leaves exhibited significant anti-inflammatory activity. Therefore, the aim of this study was to develop and validate an analytical methodology to determine the metals selenium (96Se), chromium (53Cr), nickel (62Ni), cadmium (111Cd) and lead (206Pb) in 30 samples of grapevine leaf extracts (Vitis labrusca, Bordo cultivar) using inductively coupled plasma mass spectrometry (ICP-MS). To obtain the grapevine leaf extracts the samples were milled, weighed and digested in microwave oven with nitric acid....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ICP-MS; Metals; Method validation; Vitis labrusca L.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602247

Multivariate optimization of an ultrasound-assisted extraction procedure for Cu, Mn, Ni and Zn determination in ration to chickens
Provedor de dados: 42
Autores: BARROS,JOÉLIA M.; BEZERRA,MARCOS A.; VALASQUES,GISSELI S.; NASCIMENTO JÚNIOR,BARAQUÍZIO B. DO; SOUZA,ANDERSON S.; ARAGÃO,NÁDIA M. DE.
In this work, multivariate optimization techniques were used to develop a method based on the ultrasound-assisted extraction for copper, manganese, nickel and zinc determination from rations for chicken nutrition using flame atomic absorption spectrometry. The proportions of extracting components (2.0 mol.L–1 nitric, hydrochloric and acetic acid solutions) were optimized using centroid-simplex mixture design. The optimum proportions of this mixture taken as percentage of each component were respectively 20%, 37% and 43%. Variables of method (sample mass, sonication time and final acid concentration) were optimized using Doehlert design. The optimum values found for these variables were respectively 0.24 g, 18s and 3.6 mol.L–1. The developed method allows...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rations to chicken; Ultrasound-assisted extraction; Mixture design; Doehlert design; Metals.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300891

Metal content and distribution in surface sediments in an industrial region
Provedor de dados: 42
Autores: SCHNEIDER,ISMAEL L.; TEIXEIRA,ELBA C.; RODRIGUES,MARIA LUCIA K.; ROLIM,SILVIA B.A.
The present study aimed to evaluate Cu, Cr, Ni, Zn, Pb, Mn, Al, and Fe contents, as well as their geochemical partitioning in Sinos River basin sediments in southern Brazil. This basin is a densely populated area with a substantial number of industries, especially metallurgy, electroplating works, steel mills, petrochemicals, and tanneries. The total metal concentrations were determined by X-ray fluorescence and the sediment phase concentrations were determined by applying the BCR-701 sequential extraction method proposed by the Community Bureau of Reference of the European Community, using ICP/OES. The contents extracted by a solution of 0.5 mol/L HCl were also considered. Metal contents were evaluated in the sediment fraction &lt;63 µm. Results in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BCR-701; Metals; Sediment; Sequential extraction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301043

Study of wet precipitation and its chemical composition in South of Brazil
Provedor de dados: 42
Autores: Teixeira,Elba C.; Migliavacca,Daniela; Pereira Filho,Sadi; Machado,Andréa C.M.; Dallarosa,Juliana B.
The purpose of this study is to analyze the chemical composition of wet precipitation in samples collected at three stations in the Candiota region in the Brazilian state of Rio Grande do Sul (RS). Samples were collected in 2004. Variables analyzed in wet precipitation were pH, conductivity, and concentration of Cl-, NO3-, SO4(2-) F-, Na+, Ca2+, Mg2+, K+, NH4+, Cu, Zn, Fe, Mn, Pb, Ni, Cd, Co, and Cr. SO2 and NO2 distribution over the time were also evaluated. Results have showed that pH &lt; 5.6 are found mostly at Candiota airport (85%), followed by Aceguá (72%) and Três Lagoas (65%). Enrichment Factor of the studied ions in wet deposition revealed higher Ca2+ and SO4(2-) enrichment in Três Lagoas. Factor Analysis applied to metals and major ions allowed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wet precipitation; Metals; Factor analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200016

Mercury in the sea turtle Chelonia mydas (Linnaeus, 1958) from Ceará coast, NE Brazil
Provedor de dados: 42
Autores: Bezerra,Moisés F.; Lacerda,Luiz D.; Costa,Breno G.B.; Lima,Eduardo H.S.M.
Mercury concentrations in carapace fragments of the green turtle Chelonia mydas from the Ceará coast in NE Brazil are reported. Concentrations varied from &lt;0.34 to 856.6 ng.g -1 d.w., and were highest (average of 154.8 ng.g -1 d.w.) in juveniles (n = 22), whereas lowest concentrations (average of 2.5 ng.g -1 d.w.) were observed in adult/sub-adult animals (n = 3). There was a significant negative correlation between animal size and Hg concentration probably due to different diets between juveniles and sub-adults/adults. Carapace fragments, which are non-invasive, non-lethal substrates, may be of importance for monitoring purposes of these generally endangered species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollution; Metals; Marine turtles; Monitoring.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100012

Arsenic toxicity to cladocerans isolated and associated with iron: implications for aquatic environments
Provedor de dados: 42
Autores: SALES,SUELLEN C.M.; RIETZLER,ARNOLA C.; RIBEIRO,MARCELA M.
ABSTRACT Arsenic is an ametal ubiquitous in nature and known by its high toxicity. Many studies have tried to elucidate the arsenic metabolism in the cell and its impact to plants, animals and human health. In aqueous phase, inorganic arsenic is more common and its oxidation state (As III and As V) depends on physical and chemical environmental conditions. The aim of this study was to evaluate toxicity of arsenic to Daphnia similis and Ceriodaphnia silvestrii, isolated and associated with iron. The results showed differences in toxicity of As III and As V to both species. Effective concentration (EC50) mean values were 0.45 mg L-1 (As III) and 0.54 mg L-1 (As V) for D. similis, and 0.44 mg L-1 (As III) and 0.69 mg L-1 (As V) for C. silvestrii. However, As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic ecotoxicology; Metals; Acute and chronic effects; D. similis; C. silvestrii.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200539

Seasonal variations, metal distribution and water quality in the Todos os Santos River, Southeastern Brazil: a multivariate analysis
Provedor de dados: 42
Autores: PEREIRA,CLÁUDIA A.F.; MAIA,LUIZ F.O.; FARIA,MÁRCIA C.S.; FIDÊNCIO,PAULO H.; BOMFETI,CLEIDE A.; BARBOSA JUNIOR,FERNANDO; RODRIGUES,JAIRO L.
Abstract In aquatic habitats, metal contamination from natural and anthropogenic sources continues to pose a concern for human and environmental health. Thus, it is important to complete monitoring studies to assess patterns and the extent of metal contamination in these ecosystems. The purpose of this work was to determine the concentrations of 31 chemical elements and water quality parameters of the Todos os Santos River located in the Mucuri Valley, Minas Gerais, Brazil. A multivariate statistical analysis was used to determine any seasonal and spatial patterns from the data. Results demonstrated that metals including Al, Fe, and Ni exceeded Brazilian and international guidelines nutrients as P also exceed water quality standards. Principal components...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toxic pollutants; Metals; Water quality; Environment.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602701

Evaluation of the use of Leptodactylus ocellatus (Anura: Leptodactylidae) frog tissues as bioindicator of metal contamination in Contas River, Northeastern Brazil
Provedor de dados: 42
Autores: CORREIA,LÍVIA O.; SIQUEIRA JÚNIOR,SÉRGIO; CARNEIRO,PAULO L.S.; BEZERRA,MARCOS A.
This paper presents a study on the viability of the use of tissues of the Leptodactylus ocellatus species (Anura Leptodactylidae) as a bioindicator of metal pollution. The study is based on the determination and correlation of the concentrations of manganese, chromium, zinc, nickel, copper and iron in sediments and tissues (skin, muscles and viscera) of the frog Leptodactylus ocellatus collected in the middle region of the Contas River in Bahia, Brazil. The highest levels of the metals studied were found in the viscera of this animal. In this tissue, a higher correlation of the concentration of these metals with those found in sediments was also observed. The concentrations of elements found in the skin and muscles of these amphibians have revealed no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leptodactylus ocellatus; Bioindicators; Sediments; Metals; Contas River.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401549

Inhibition of iron and copper uptake by iron, copper and zinc
Provedor de dados: 48
Autores: ARREDONDO,MIGUEL; MARTÍNEZ,RONNY; NÚÑEZ,MARCO T; RUZ,MANUEL; OLIVARES,MANUEL.
Interactions of micronutrients can affect absorption and bioavailability of other nutrients by a number of mechanisms. In aqueous solutions, and at higher uptake levels, competition between elements with similar chemical characteristics and uptake process can take place. The consequences of these interactions may depend on the relative concentrations of the nutrients. In this work, we measure the effects of increasing concentrations of iron, zinc, and copper on iron and copper uptake in Caco-2 cells. Intracellular Fe or Cu levels were affected by incubating with increased concentrations of metals. However, when the cells already had different intracellular metal concentration, the uptake of Fe or Cu was nor affected. In competition studies, we showed that...
Tipo: Journal article
Palavras-chave: Competition; Interaction; Metals; Uptake.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100011

Lignolytic enzymes produced by Trametes villosa ccb176 under different culture conditions
Provedor de dados: 58
Autores: Yamanaka,Renata; Soares,Clarissa F.; Matheus,Dácio R.; Machado,Kátia M.G.
The expression of the enzymatic system produced by basidiomycetous fungi, which is involved in the degradation of xenobiotics, mainly depends on culture conditions, especially of the culture medium composition. Trametes villosa is a strain with a proven biotechnological potential for the degradation of organochlorine compounds and for the decolorization of textile dyes. The influence of glucose concentration, addition of a vegetable oil-surfactant emulsion, nature of the surfactant and the presence of manganese and copper on the growth, pH and production of laccase, total peroxidase and manganese-dependent peroxidase activities were evaluated. In general, acidification of the medium was observed, with the pH reaching a value close to 3.5 within the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laccase; Metals; MnP; Vegetable oil; Surfactants.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000100019

Spatial and temporal variation of the nutrients in the sediment and leaves of two Brazilian mangrove species and their role in the retention of environmental heavy metals
Provedor de dados: 61
Autores: Bernini,Elaine; Silva,Maria A. B. da; Carmo,Tania M. S. do; Cuzzuol,Geraldo R. F.
Spatial and temporal variation of the nutrient concentrations in leaves and sediment between the roots of Laguncularia racemosa (L.) Gaertn. f and Rhizophora mangle L. was analyzed in the mangrove forest of the estuary of São Mateus River, Espírito Santo, Brazil. In leaves, the nutrients followed the sequence: N&gt; Ca&gt; K&gt; Mg&gt; S&gt; P&gt; Fe&gt; Mn&gt; Zn&gt; Cu, and there were significant differences between species and sites studied. In general, the levels of K were higher in the dry season compared to the rainy season for both species analyzed while Ca and Cu showed higher concentrations in the rainy season for Laguncularia racemosa. In the sediment, the nutrients followed the sequence: Mg&gt; Ca&gt; Fe&gt; K&gt; Mn&gt; P&gt; Zn&gt; Cu, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Concentration factor; Macronutrients; Micronutrients; Metals.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000300005

The effect of lead on the phytochemistry of Tithonia diversifolia exposed to roadside automotive pollution or grown in pots of Pb-supplemented soil
Provedor de dados: 61
Autores: Olivares,Elizabeth.
Tithonia diversifolia, a ruderal weedy species utilized in agroforestry, is widely distributed in the tropics, often being found in wasteland, margins of polluted city rivers and roadsides. The objective of this study was to compare plants sampled at a light and heavy traffic roadside for metal concentration and foliar compounds which may be related to senescence and/or detoxification of metals. The field survey was followed by an experiment in pots of Pb-acetate-supplemented soil to verify if the same response is obtained under controlled conditions with regard to Pb. The concentration of Pb in leaves and roots of plants sampled at a heavy traffic roadside was higher than in samples from a light traffic site. The content of Cr, Al, Fe, Cu and Ni was also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Metals; Mexican sunflower; Phenols; Pollution; Weeds.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000300004

Growth and volatile compounds of Martianthus leucocephalus exposed to heavy metal stress
Provedor de dados: 65
Autores: Jesus,Daniel da Silva de; Azevedo,Bianca Oliveira de; Pinelli,Milena Santos; Korn,Maria das Graças Andrade; Azevedo Neto,André Dias de; Lucchese,Angélica Maria; Oliveira,Lenaldo Muniz de.
ABSTRACT:  Martianthus leucocephalus is found in the semi-arid Northeast of Brazil and has high pharmacological potential due to the production of volatile compounds. This study aimed to evaluate the Cd (15, 30, 45 and 60µmol L-1), Cu (30, 60, 90 and 120µmol L-1) and Zn (150, 300, 450 and 600µmol L-1) levels on the growth of this species and its volatile compounds production. Apical cuttings were placed in plastic trays containing 6.0L nutrient solution, and after rooting, they were submitted to Cd, Cu and Zn treatments for 15 days. All the metals evaluated reduced the succulence and growth of all parts of M. leucocephalus . This effect was accompanied by the increase of Cd, Cu and Zn concentrations in all plant tissues. Volatile compounds content produced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lamiaceae; Metals; Relative growth.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001202110