Consulta: subjectFacets:"Copper"
Registros recuperados: 61
Data/hora: 03/06/2024 07:20:19

Concentración óptima y tóxica de cobre para el crecimiento de bacterias ruminales.
Provedor de dados: 32
Autores: Cervantes Gómez, Daniel.
El cobre (Cu) es un micromineral que cumple funciones esenciales en el organismo de los animales; del mismo modo es necesario para las bacterias ruminales, implicando que todos los nutrientes que requieren los microrganismos, dentro de estos el cobre, deben estar disponibles en el rumen en forma estable y continúa para asegurar su crecimiento. Por lo anterior, en el presente estudio se desarrollaron dos ensayos experimentales para determinar la concentración óptima y tóxica de cobre, con base al crecimiento y la actividad de las bacterias ruminales; en el primer experimento se utilizaron seis concentraciones de cobre (0, 10, 20, 30, 40 y 50 ppm), en un medio de cultivo que contenía heno de alfalfa. Los resultados de este ensayo mostraron que las...
Palavras-chave: Cobre; Concentración óptima y tóxica; Bacterias ruminales; Digestibilidad in vitro; Copper; Optimal and toxic concentration; Ruminal microbes; In vitro digestibility; Ganadería; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/774

Accumulation capacity of cadmium and copper and their effects on photosynthetic performance in Azolla filiculoides Lam. under induced rhizofiltration
Provedor de dados: 73
Autores: Valderrama,Aly; Carvajal,Danny E.; Peñailillo,Patricio; Tapia,Jaime.
ABSTRACT This study evaluated the capacity of Azolla filiculoides to enhance heavy metal accumulation through the addition of different concentrations of cadmium (Cd) and copper (Cu), as ethylenediaminetetraacetic acid (EDTA) complexes, under hydroponic conditions. The physiological effect was determined by Photosynthetic efficiency (Fv/Fm) as an indicator of plant stress, and heavy metal content was measured with flame atomic absorption spectroscopy in the whole plants. The results obtained in rhizofiltration systems did not show an increase in accumulation when Cd-EDTA was added, but the Cu-EDTA increased the accumulation of Cu by plants. Although the Fv/Fm was decreased in all treatments, only the Cd-EDTA complex caused damage to photosystem II (PSII)...
Tipo: Journal article
Palavras-chave: EDTA; Azollaceae; Cadmium; Copper; Photosynthetic metabolism.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200283

Correcao da deficiencia de cobre em lavouras de soja em solos de cerrado.
Provedor de dados: 14
Autores: GALRAO, E. Z.
bitstream/item/121559/1/gtec-30.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Correcao do solo.; Cerrado; Cobre; Glycine Max; Soja.; Copper; Soil amendments; Soybeans.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/555044

Girassol: nutricao mineral e adubacao.
Provedor de dados: 14
Autores: SFREDO, G. J.; CAMPO, R. J.; SARRUGE, J. R.
Exigencias nutricionais; Efeitos dos nutrientes essenciais; Calagem e adubacao.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Nutricao mineral; Brasil; Sunflower; Fertilization; Sulphur.; Adubação; Calagem; Boro; Cálcio; Cobre; Ferro; Enxofre; Fósforo; Girassol; Magnésio; Manganês; Nitrogênio; Molibdênio; Potássio; Zinco.; Brazil; Boron; Copper; Calcium; Liming; Magnesium; Manganese; Iron; Nutrition; Molybdenum; Nitrogen; Phosphorus; Potassium; Zinc.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445619

Deficiências de cálcio, fósforo e cobre, e toxicidade pelo ferro em bubalinos na ilha de Marajó.
Provedor de dados: 14
Autores: COSTA, N. A. da; MOREIRA, J. R. de A.
bitstream/item/59123/1/CPATU-ComTec41.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Bubalino; Ilha do Marajó; Pará; Brasil; Buffalo; Deficiency; Intoxication.; Bubalus Bubalis; Cálcio; Cobre; Deficiência; Ferro; Fósforo; Intoxicação; Mortalidade.; Mineral; Amazonia; Copper; Calcium; Iron; Mortality; Phosphorus.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376355

Principais deficiências minerais em bovinos de corte.
Provedor de dados: 14
Autores: MORAES, S. da S.
Deficiências e desequilíbrios minerais em bovinos são descritas em quase todas as regiões do mundo. Os elementos minerais comumente deficientes para bovinos com dieta exclusiva de pasto são: P, Na, I, Cu, Co, e Se. Em algumas regiões sob condições especificas, Ca, Mg e Mn. Por outro lado, Fe e Mn estão, normalmente, em excesso nas regiões do Cerrado Central do Brasil e Pantanal. A ingestão de dietas deficientes ou desequilibradas de elementos minerais torna mais difícil a manutenção de concentrações ótimas nos tecidos . No inicio, causa lesões bioquímicas que induzem a trocas nas formas de funcionamento, concentração e atividade do elemento nos fluidos e tecidos do corpo. Essas alterações diferem conforme os elementos e suas funções, com o grau de duração...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Bovino de corte; Brasil; Mineral deficiencies; Sulphur; Yodine.; Cálcio; Cloro; Cobre; Cobalto; Deficiência Mineral; Ferro; Enxofre; Fósforo; Manganês; Magnésio; Iodo; Potássio; Selênio; Sódio; Zinco.; Calcium; Cobalt; Copper; Brazil; Beef cattle; Chlorine; Iron; Magnesium; Manganese; Phosphorus; Potassium; Sodium; Selenium; Zinc.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/325198

Depuration of copper nitrate and chloride in the Indian brown mussel Perna indica
Provedor de dados: 5
Autores: Kondajii, N; Menon, N.
It is understood that the rate of bioaccumulation and subsequent depuration of heavy metals in marine animals is influenced by the chemical state, as well as the kinetics of transformation between different species of chemical salts dissolved in water. The Indian Brown mussel, Perna indica, was exposed to copper nitrate and chloride, individually, to analyse the rate of accumulation, depuration, oxygen uptake and filtration rates. When supplied in very low quantities, environmentally realistic concentrations, the rate of accumulation of copper nitrate and chlorides showed variations. When the animals were transferred to sea water, these two salts did not show any clear cut differences in the depuration rate. Irrespective of the previous accumulation...
Tipo: Text
Palavras-chave: Perna indica; Bivalvia; Chlorides; Copper; Mussel culture; Heavy metals; Marine pollution; Accumulation; Self purification.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1603.pdf

Physiological responses of Macoma balthica to copper pollution in the Baltic
Provedor de dados: 5
Autores: Sokolowski, A; Wolowicz, M; Hummel, H; Bogaards, R.
Physiological and behavioral responses to Cu exposure were measured in the Baltic clam Macoma balthica from the Gulf of Gdansk, southern Baltic Sea. The burrowing activity, mortality rate, glycogen content, condition index and free amino acid (FAA) composition were analysed as indicators of stress in a series of field and laboratory studies. M. balthica exposed to Cu showed clear Cu-concentration related differences in burrowing activity and mortality rate, but no consistent differences in the condition index, glycogen content, and free amino acids. The clams from a less polluted area reacted more strongly and were more sensitive to additional stress as compared to organisms from a more polluted region. The effect of Cu on the ecophysiology of Baltic clams...
Tipo: Text
Palavras-chave: Stress; Cuivre; Écophysiologie; Macoma balthica; Mer Baltique; Stress; Copper; Ecophysiology; Macoma balthica; Baltic Sea.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43606/43925.pdf

SAR of Sponge-Inspired Hemibastadin Congeners Inhibiting Blue Mussel PhenolOxidase
Provedor de dados: 5
Autores: Niemann, Hendrik; Hagenow, Jens; Chung, Mi-young; Hellio, Claire; Weber, Horst; Proksch, Peter.
Hemibastadin derivatives, including the synthetically-derived 5,5-dibromohemibastadin-1 (DBHB), are potent inhibitors of blue mussel phenoloxidase (PO), which is a key enzyme involved in the firm attachment of this invertebrate to substrates and, thus, a promising molecular target for anti-fouling research. For a systematic investigation of the enzyme inhibitory activity of hemibastadin derivatives, we have synthesized nine new congeners, which feature structural variations of the DBHB core structure. These structural modifications include, e.g., different halogen substituents present at the aromatic rings, different amine moieties linked to the (E)-2-(hydroxyimino)-3-(4-hydroxyphenyl)propionic acid, the presence of free vs. substituted aromatic hydroxyl...
Tipo: Text
Palavras-chave: Antifouling; Hemibastadin; Phenoloxidase; Sponges; Copper; Mytilus edulis.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00273/38432/73167.pdf

Essai de détermination d'une typologie des sédiments côtiers en fonction de l'apparition d'eaux colorées
Provedor de dados: 5
Autores: Arzul, Genevieve; Youenou, A.; Derrien, Annick; Gentien, Patrick; Crassous, M.p.; Lunven, M.
The study of different chemical parameters characterizing the coastal sediment, showed a possible relation between, respectively, high levels in organic matter and total copper, and the "red tide"  phenomenon.
Tipo: Text
Palavras-chave: Sédiment côtier; Eaux colorées; Matière organique; Cuivre; Coastal sediment; Red time; Organic matter; Copper.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00425/53708/54565.pdf

Méthode de dosage du cadmium, du cuivre, du plomb et du zinc dans la chair de poissons
Provedor de dados: 5
Autores: Auger, Dominique.
An analytical technique for cadmium, copper, lead and zinc determination in fish tissue used in monitoring programmes is described. Atomic absorption spectrophotometry on nitric digested samples is performed.
Tipo: Text
Palavras-chave: Cadmium; Cuivre; Poisson; Plomb; Zinc; Analyse; Cadmium; Copper; Lead; Zinc; Fish; Determination.
Ano: 1989
URL: https://archimer.ifremer.fr/doc/00489/60059/63343.pdf

Effects of copper on the dinoflagellate Alexandrium minutum and its allelochemical potency
Provedor de dados: 5
Autores: Long, Marc; Holland, Aleicia; Planquette, Helene; Gonzalez Santana, David; Whitby, Hannah; Soudant, Philippe; Sarthou, Geraldine; Hégaret, Helene; Jolley, Dianne F.
The dinoflagellate Alexandrium minutum produces toxic compounds, including paralytic shellfish toxins, but also some unknown extracellular toxins. Although copper (Cu) is an essential element, it can impair microalgal physiology and increase their toxic potency. This study investigated the effect of different concentrations of dissolved Cu (7 nM, 79 nM and 164 nM) on A. minutum allelochemical potency, here defined as negative effects of a protist on competing protists through the release of chemicals. This was studied in relation to its physiology. The effects of Cu were assessed on A. minutum growth, reactive oxygen species level, photosynthesis proxies, lipid metabolism, exudation of dissolved organic compounds, allelochemical potency and on the...
Tipo: Text
Palavras-chave: Alexandrium; Copper; Toxicity; Allelopathy; Physiology; Exudate.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00484/59612/62629.pdf

Combined effects of antifouling biocides on the growth of three marine microalgal species
Provedor de dados: 5
Autores: Dupraz, Valentin; Stachowski-haberkorn, Sabine; Menard, Dominique; Limon, Gwendolina; Akcha, Farida; Budzinski, Helene; Cedergreen, Nina.
The toxicity of the antifouling compounds diuron, irgarol, zinc pyrithione (ZnPT), copper pyrithione (CuPT) and copper was tested on the three marine microalgae Tisochrysis lutea, Skeletonema marinoi and Tetraselmis suecica. Toxicity tests based on the inhibition of growth rate after 96-h exposure were run using microplates. Chemical analyses were performed to validate the exposure concentrations and the stability of the compounds under test conditions. Single chemicals exhibited varying toxicity depending on the species, irgarol being the most toxic chemical and Cu the least toxic. Selected binary mixtures were tested and the resulting interactions were analyzed using two distinct concentration-response surface models: one using the concentration addition...
Tipo: Text
Palavras-chave: Diuron; Irgarol; Pyrithione; Copper; Microbial ecotoxicology; Mixture model.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55695/57362.pdf

Copper levels evolution in Arcachon bay oysters : role of the regulation on antifouling paints
Provedor de dados: 5
Autores: Alzieu, Claude; Barbier, Georges; Sanjuan, Jane.
The ban of tributyltin compounds in antifouling paints induced a strong decrease in the level of tin in Arcachon bay. At the same time, copper inputs have increased tenfold since 1982 owing to the widespread use of paints containing cuprous oxide. In spite of this large input, the statistical analysis of monitoring data (1979-1985) show a relative stability in the copper levels in Arcachon bay oysters.
Tipo: Text
Palavras-chave: Cuivre; Huîtres; Bassin d'Arcachon; Peintures antisalissures; Copper; Oysters; Arcachon Bay; Antifouling paints.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00022/13291/10337.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

Development of an ecotoxicological protocol for the deep-sea fauna using the hydrothermal vent shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Auguste, M.; Mestre, N. C.; Rocha, T. L.; Cardoso, C.; Cueff-gauchard, Valerie; Le Bloa, Simon; Cambon-bonavita, Marie-anne; Shillito, B.; Zbinden, M.; Ravaux, J.; Bebianno, M. J.
In light of deep-sea mining industry development, particularly interested in massive-sulphide deposits enriched in metals with high commercial value, efforts are increasing to better understand potential environmental impacts to local fauna. The aim of this study was to assess the natural background levels of biomarkers in the hydrothermal vent shrimp Rimicaris exoculata and their responses to copper exposure at in situ pressure (30 MPa) as well as the effects of depressurization and pressurization of the high-pressure aquarium IPOCAMP. R. exoculata were collected from the chimney walls of the hydrothermal vent site TAG (Mid Atlantic Ridge) at 3630 m depth during the BICOSE cruise in 2014. Tissue metal accumulation was quantified in different tissues...
Tipo: Text
Palavras-chave: Deep-sea mining; Hydrothermal vents; Biomarkers; Ipocamp; Copper; TAG.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00323/43465/42869.pdf

Investigations into the uptake of copper, iron and selenium by a highly sulphated bacterial exopolysaccharide isolated from microbial mats
Provedor de dados: 5
Autores: Moppert, Xavier; Le Costaouec, Tinaig; Raguenes, Gerard; Courtois, Anthony; Simon-colin, Christelle; Crassous, Philippe; Costa, Bernard; Guezennec, Jean.
A bacterium isolated from microbial mats located on a polynesian atoll produced a high molecular weight (3,000 kDa) and highly sulphated exopolysaccharide. Previous studies showed that the chemical structure of this EPS consisted of neutral sugars, uronic acids, and high proportions of acetate and sulphate groups. The copper- and iron-binding ability of the purified pre-treated native EPS was investigated. Results showed that this EPS had a very high affinity for both copper (9.84 mmol g(-1) EPS) and ferrous iron (6.9 mmol g(-1) EPS). Amazingly, this EPS did not show any affinity for either ferric ions or selenium salts. This finding is one of the first steps in assessing the biotechnological potential of this polysaccharide.
Tipo: Text
Palavras-chave: Sulphated exopolysaccharide; Microbial mats; Iron; Copper; Binding capacity.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6397.pdf

Quantifying diet-borne metal uptake in Gammarus pulex using stable isotope tracers
Provedor de dados: 5
Autores: Pellet, Bastien; Ayrault, Sophie; Tusseau-vuillemin, Marie-helene; Gourlay-france, Catherine.
Gammarids are aquatic amphipods widely used for water quality monitoring. To investigate the copper and cadmium diet-borne metal uptake in Gammarus pulex, we adapted the pulse-chase stable isotopes-based approach to determine the food ingestion rate (IR), the gut retention time (GRT) and the metal assimilation efficiencies (AE). G. pulex were fed with 65Cu-, 106Cd-, and 53Cr-labeled alder leaves for 7.5 h and then with unlabeled leaves for 5 d. The metal stable isotope contents in the gammarids, leaves, filtered water and periodically collected feces were determined. Chromium was poorly assimilated by the gammarids; thus, Cr was used as an unassimilated tracer. The first tracer defecation occurred before the first feces harvest, indicating a gut passage...
Tipo: Text
Palavras-chave: Assimilation efficiency; Gammarus pulex; Cadmium; Copper; Biodynamic model; Diet-borne uptake.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00211/32238/31762.pdf

Essential metal contents in indigenous gammarids related to exposure levels at the river basin scale: Metal-dependent models of bioaccumulation and geochemical correlations
Provedor de dados: 5
Autores: Lebrun, Jeremie D.; Uher, Emmanuelle; Tusseau-vuillemin, Marie-helene; Gourlay-france, Catherine.
Biomonitoring, assumed to be an integrative measurement of the chemical exposure of aquatic organisms, is not straightforward for essential metals because they can be actively regulated by animals. Although increasing bioaccumulation with exposure levels is a crucial endpoint for the development of biomonitors, it is rarely verified in real environments, where the metal concentrations are rather low and vary little. This study was designed at the scale of a river basin to assess the ability of Gammarus pulex indigenous populations to accumulate Cu, Zn and Mn in realistic exposure conditions. During two annual campaigns, water and gammarids were collected at various sites contrasted in terms of physicochemistry and contamination. The results show...
Tipo: Text
Palavras-chave: Biomonitor; Metal bioavailability; Gammarus pulex; Copper; Zinc; Manganese.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00180/29154/28656.pdf

Can pesticides, copper and seasonal water temperature explain the seagrass Zostera noltei decline in the Arcachon bay?
Provedor de dados: 5
Autores: Gamain, Perrine; Feurtet-mazel, Agnes; Maury-brachet, Regine; Auby, Isabelle; Pierron, Fabien; Belles, Angel; Budzinski, Helene; Daffe, Guillemine; Gonzalez, Patrice.
Dwarf eelgrasses (Zostera noltei) populations have decreased since 2005 in Arcachon Bay (southwest France). Various stressors have been pointed out, however the role of xenobiotics like pesticides or copper (Cu) and of parameters like water temperature warming have not yet been explored. To determine their impact, Z. noltei individuals were collected in a pollution-free site and transferred to the laboratory in seawater microcosms. This dwarf eelgrass was exposed to a pesticide cocktail and copper, alone or simultaneously, at temperatures (10 °C, 20 °C, 28 °C) representative of different seasons. After a two-week contamination, leaf growth, leaf bioaccumulation of Cu, and differential expression of target genes were studied. Eelgrasses bioaccumulated Cu...
Tipo: Text
Palavras-chave: Zostera noltei; Arcachon Bay; Pesticides; Copper; Cellular impacts.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00407/51831/58536.pdf

Copper induces expression and methylation changes of early development genes in Crassostrea gigas embryos
Provedor de dados: 5
Autores: Sussarellu, Rossana; Lebreton, Morgane; Rouxel, Julien; Akcha, Farida; Riviere, Guillaume.
Copper contamination is widespread along coastal areas and exerts adverse effects on marine organisms such as mollusks. In the Pacific oyster, copper induces severe developmental abnormalities during early life stages; however, the underlying molecular mechanisms are largely unknown. This study aims to better understand whether the embryotoxic effects of copper in Crassostrea gigas could be mediated by alterations in gene expression, and the putative role of DNA methylation, which is known to contribute to gene regulation in early embryo development. For that purpose, oyster embryos were exposed to 4 nominal copper concentrations (0.1, 1, 10 and 20 μg L−1 Cu2+) during early development assays. Embryotoxicity was monitored through the oyster embryo-larval...
Tipo: Text
Palavras-chave: Oyster; Embryotoxicity; Copper; Gene expression; DNA methylation.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00417/52856/53756.pdf

Metal bioaccumulation and metallothionein concentrations in larvae of Crassostrea gigas
Provedor de dados: 5
Autores: Damiens, Gautier; Mouneyrac, Catherine; Quiniou, Francoise; His, Edouard; Gnassia Barelli, Mauricette; Romeo, Michèle.
Larval stages of bivalve molluscs are highly sensitive to pollutants. Oysters from a hatchery from Normandy (English Channel) were induced to spawn, and fertilized eggs were exposed to copper or cadmium for 24 h. Metal accumulation (from 0.125 to 5 mu g Cu L-1 and from 25 to 200 mu g Cd L-1) and MT concentrations were measured in larvae. Compared to controls, larvae accumulated copper and cadmium with an increase in MT concentrations particularly with cadmium (i.e. 130.96 ng Cu (mg protein)(-1) and 12.69 mu g MT (mg protein)(-1) at 1 mu g Cu L-1 versus 23.19 ng Cu (mg protein)(-1) and 8.92 mu g MT (mg protein)(-1) in control larvae; 334.3 ng Cd (mg protein)(-1) and 11.70 mu g MT (mg protein)(-1) at 200 mu g Cd L-1 versus 0.87 ng Cd (mg protein)(-1) and...
Tipo: Text
Palavras-chave: Bidassoa estuary; Arcachon bay; Metallothionein; Copper; Cadmium; Crassostrea gigas larvae.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1229.pdf

The effect of copper on the daily growth rate and photosynthetic efficiency of the brown macroalga Padina boergesenii
Provedor de dados: 20
Autores: Pratap, H.B.; Mamboya, F.A.; Mtolera, M.S.P.; Björk, M.
The effect of copper (Cu) on the daily growth rate (DGR) and photosynthetic efficiency (PE) of the brown macroalga Padina boergesenii was studied under controlled laboratory conditions. The DGR was measured as an increase in fresh weight while the PE was measured as the ratio of variable to maximal chlorophyll fluorescence (Fv/Fm). Padina boegesenii were exposed to 25, 50, 100 and 500mg Cu/l for 21 days. The DGR and PE of P. boergesenii decreased significantly with an increase in copper concentration in the growth media. This study shows that copper is acutely toxic to P. boergesenii at concentrations higher than 500mg Cu/l. Low concentration of copper is toxic to P. boergesenii after a prolonged exposure of 21 days. Similarly, exposure time has a...
Tipo: Proceedings Paper
Palavras-chave: Copper; Algae.
Ano: 1999
URL: http://hdl.handle.net/1834/787

Evaluación de la tasa fotosintética del alga verde Rhizoclonium riparium (Roth) Kützing ex Harvey, expuesta a cobre y su uso como indicador de contaminación por metales en aguas estuarinas
Provedor de dados: 20
Autores: Montoya, W.; Peña, E.J.; Benítez, R.
Algae have been used as bioindicators by having several advantages such as they have short life cycles, they can take up nutrients directly from water, they are generally easy to collect in sufficient amounts from various habitats; and they readily accumulate compounds present in seawater, making tissue analyses reliable indicators of water quality. In order to evaluate the bioremoval capability of the green alga Rhizoclonium riparium, the photosynthetic responses to heavy metal pollution under different sublethal concentrations of copper was assessed. Photosynthetic rates were significantly low (p &lt;0.05) at low copper concentrations, between (0.01 y 10 mg/l). Maximum photosynthetic values were shown at 30 y 60 mg/l and almost cero at 150 mg/ l of Cu....
Tipo: Conference Material
Palavras-chave: Heavy metals; Biological stress; Algae; Indicator species; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Heavy metals; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Algae; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006
URL: http://hdl.handle.net/1834/2256

Toxicity of cadmium and copper and their effect on some biochemical parameters of marine fish mugil sheheli
Provedor de dados: 20
Autores: Abou El-Naga, E.H.; El-Moselhy, K.M.; Hamed, M.A.
The present work aimed to estimate the toxicity of cadmium and copper to fingerlings of marine fish Mugil seheli, as well as the effect of different concentratios of Cd and Cu on some biochemical parameters (Aspartate and alanine transaminase enzymes, glucose, glycogen, lipid and protein) in the fish organs. 96-h LC50s of Cd and Cu were 5.36 and 1.64 ppm, respectively. Levels of aspartate and alanine transaminase were reduced within 2 days of exposure to different concentrations of Cd (2.0 and 0.5 ppm) and Cu (0.5 and 0.2 ppm) in both plasma and muscle tissue. Glucose was increased reaching the highest values after 4 days of the treatment with Cd and Cu, while muscle glycogen was increased at first days then dropped after 14 days below control level....
Tipo: Journal Contribution
Palavras-chave: Toxicity; Cadmium; Copper; Aspartate and Alanine transaminases; Glucose; Glycogen; Lipid; Protein; Fish (Mugil seheli) Abiotic factors Accumulation Chemical analysis Marine fish.
Ano: 2005
URL: http://hdl.handle.net/1834/1296

Etude des polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans les moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier.
Provedor de dados: 20
Autores: Dartige, A.Y.
Ce travail a pour objectif de déterminer le niveau de contamination des produits halieutiques mauritaniens. Pour cela, nous avons étudié les polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans des moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier en Mauritanie sur une période de quatre mois (novembre 1998 à février 1999). Sur les 400 échantillons analysés les moyennes de concentrations trouvées restent faibles par rapports à celles trouvées dans d'autres zones peu polluées (Amiard et al. 1986b). Ce qui n'est pas le cas du cadmium qui présente des valeurs plus élevées, phénomène fréquemment rencontré le long de la côte ouest africaine (Sidoumou et al. 1992). Par ailleurs, dans cette présente étude il apparaît que les moules de petites...
Tipo: Other
Palavras-chave: Chemical analysis; Copper; Environmental conditions; Iron; Mercury; Size; Zinc; Copper; Iron; Environmental conditions; Mercury; Size; Zinc; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_3950; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4751; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_8517.
Ano: 1999
URL: http://hdl.handle.net/1834/1225

Pre-concentration and separation of Fe (III), Co (II), Ni (II) and Zn (II) by solid-phase extraction using silica modified with N-propylsalicylaldimine
Provedor de dados: 20
Autores: Hamed, M.A.
N- propylsalicylaldimine based on porous silica, as ion exchanger, was used for the separation and preconcentration of Fe3+, Co2+, Ni2+ and Zn2+ from surface water samples collected from eleven locations at Nile river, Mediterranean and Red seas as well as tap water of Mansoura city. The effects of pH value, time of stirring, concentration of eluting acids and some common ionic species on the separation and preconcentration of the investigated metal ions in synthetic aqueous solutions were studied. The results indicate that the optimum conditions for separation are pH = 9.0-9.5 and time of stirring = 30 min. HCl is better eluent for the investigated metal ions than HNO3 except for Fe3+. Citrate and EDTA gave severe interference on the recovery of the metal...
Tipo: Journal Contribution
Palavras-chave: Copper; Efficiency; Environments; Copper; Efficiency; Environment; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_2491; Http://aims.fao.org/aos/agrovoc/c_2593.
Ano: 2005
URL: http://hdl.handle.net/1834/1148

Toxicity of copper, mercury and lead to a marine nematode
Provedor de dados: 27
Autores: Vranken, G.; Heip, C.H.R.
Toxicity of copper, lead and mercury to the nematode &lt;i&gt;Diplolaimella&lt;/i&gt; spec 1 is studied. Mortality responses obtained demonstrate high resistance to heavy metals. Population growth parameters as the intrinsic rate of natural increase and net-reproductivity are significantly depressed at copper-concentrations which cause no juvenile mortality. The lowest concentrations tested caused significant inhibition of development rate in both sexes. For this particular nematode species suppression of fecundity and developmental inhibition are more reliable criteria, determining non-exceedable limits with regard to environmental safety. Our tests show that nematode productivity may be significantly depressed at copper levels found in some areas of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Lead; Mercury; Toxicity; Nematoda [Nematodes].
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3250

Solubility and availability of micronutrients extracted from silicate agrominerals
Provedor de dados: 86
Autores: Marchi,Giuliano; Guelfi-Silva,Douglas Ramos; Malaquias,Juaci Vitória; Guilherme,Luiz Roberto Guimarães; Spehar,Carlos Roberto; Martins,Eder de Souza.
Abstract: The objective of this work was to evaluate the solubility of the micronutrients copper, nickel, and zinc, chemically extracted from silicate agrominerals, as alternative sources of potassium for lettuce (Lactuca sativa) and rice (Oryza sativa) cultures, as well as their availability to the plants. The micronutrient contents of five agrominerals (alkaline ultramafic, biotite schist, volcanic breccia, phlogopite schist, and mining by-product from Chapada) were evaluated, after being extracted by the citric acid, hydrochloric acid, diethylenetriaminepentaacetic acid, 3051A, neutral ammonium citrate, and Mehlich-3 methods. The agrominerals, at the doses of 0 (control), 200, 400, and 600 kg ha-1 K, were mixed to soil where lettuce and rice were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Mining by-product; Nickel; Nutrient availability; Zinc.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2020000100600

COPPER CRISIS AND AGRICULTURAL RENAISSANCE IN ZAMBIA: AN ECONOMY-WIDE ANALYSIS
Provedor de dados: 31
Autores: Lofgren,   Hans; Robinson,   Sherman; Thurlow,   James.
Zambia's strong dependence on copper exports has suppressed other tradables sectors, indicative of a Dutch disease phenomenon.  The current copper crisis will have strong economic effects, possibly reversing such Dutch disease effects.  We use a computable general equilibrium model built around a 1995 social accounting matrix to simulate the short- and long-run effects of two scenarios that reflect the current crisis, a 20 percent reduction in world copper prices and a complete collapse of copper mining.  Compared to the short run, the long run is characterized by more flexibility in production technology and capital allocation. Both scenarios require a significant reduction in the "non-copper" trade deficit, absorption, and household consumption.  The...
Tipo: Conference Paper or Presentation
Palavras-chave: Zambia; Copper; Structural adjustment; Agriculture; General equilibrium; International Development; C68; O55; Q17; Q32.
Ano: 2003
URL: http://purl.umn.edu/25805

Effects of Dietary Copper on Growth Performance, Slaughter Performance and Nutrient Content of Fecal in Growing Goslings from 28 to 70 Days of Age
Provedor de dados: 89
Autores: Yang,Z; Qi,XM; Yang,HM; Dai,H; Xu,CX; Wang,ZY.
ABSTRACT A dose-response experiment with four dietary copper concentrations (4.17, 8.17, 12.17 and 16.17 mg/kg) was conducted to estimate the growth performance, slaughter performance, nutrient content of fecal and liver copper concentrations of growing Goslings from 28 to 70 d of age. Two hundred healthy male Yangzhou geese with similar body weight were randomized to four groups with five replicates per treatment and ten geese per replicate. Average daily feed intake, average daily gain and feed conversion ratio of geese for each pen were measured from 28 to 70 d of age. At 70 d of age, two geese were selected randomly from each pen and slaughtered to evaluate carcass quality. Metabolism experiment was conducted with five male geese from each group (one...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Goslings; Copper; Growth performance; Slaughter performance; Nutrient content of fecal.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000100045

Assessment of micronutrient extractants from soils of Paraná, Brazil
Provedor de dados: 90
Autores: Sarto,Marcos Vinicius Mansano; Steiner,Fábio; Lana,Maria do Carmo.
In Brazil, plant-available micronutrients in the soil can be determined by several chemical extractants, the most common of which are dilute acid and chelating solutions. The purpose of this study was to assess the extractants 0.1 mol L-1 HCl, Mehlich-1, Mehlich-3 and DTPA for analysis of the micronutrients Cu, Zn, Fe, and Mn in soils from the state of Paraná. In samples from 12 soils (0-20 cm layer), wheat was planted (Triticum aestivum), grown for 42 days after emergence, and then bean (Phaseolus vulgaris) for 38 days. At the end of each planting period, the soil was sampled again. All extractants tested to assess the availability of Cu, Zn, Fe, and Mn correlated with each other. The efficiency of the extractants HCl, Mehlich-3 and DTPA in assessing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil analysis; Correlation; Copper; Zinc; Iron; Manganese.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600024

The effects of heavy metals on the incidence of morphological deformities in Chironomidae (Diptera)
Provedor de dados: 103
Autores: Deliberalli,Wanessa; Cansian,Rogério L.; Pereira,Albanin A. M.; Loureiro,Rafael C.; Hepp,Luiz U.; Restello,Rozane M.
ABSTRACT Streams in urban areas are strongly impacted by the input of organic matter and metals, for instance copper (Cu) and zinc (Zn). These metals are essential for the aquatic biota, but when absorbed in excess they are toxic. In Chiro nomidae larvae, the deleterious effects of heavy metals can be ascertained by analyzing the morphological deformities of the larval mentum, a structure of the oral cavity. In this study, we evaluated I) the bioavailability of Cu and Zn in urban stream sediments and II) the relationship between Cu and Zn concentrations and the incidence of deformities in the mentum of Chironomus larvae. Chironomid flies were collected from four locations in two streams at an urban area in southern Brazil. They were identified and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomonitoring; Copper; Environmental quality; Mentum; Zinc.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100316

Copper distribution in leaves and roots of plants growing on a copper mine-tailing storage facility in northern Chile
Provedor de dados: 97
Autores: ORTIZ-CALDERÓN,CLAUDIA; ALCAIDE,ÓSCAR; LI KAO,JULIA.
In a copper mine-tailing afforested we characterized the physicochemical properties of the substrate at vegetated and non-vegetated patches. We studied the accumulation of copper in roots and leaves of the species present at the site, to evaluate their phytoextraction and/or phytostabilization potential. The non-vegetated mine-tailing substrate showed a high contení of metals, mainly copper (&gt; 2.5 g kg-1), a pH 7.4, high contení of salts and 5.0 % organic matler. Vegelaled palches al íhe lailing showed similar characlerislics of pH, salís and organic maller conlenl, and showed a lolal copper concenlralion lower íhan íhe conlenl found ai íhe non-vegelaled patches. Nine plant species present at the site were screened for copper accumulation and...
Tipo: Journal article
Palavras-chave: Copper; Phytoextraction; Phytostabilisation; Remediation; Native plants.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400004

Recent advances in the study of biocorrosion: an overview
Provedor de dados: 59
Autores: Beech,Iwona B.; Gaylarde,Christine C.
Biocorrosion processes at metal surfaces are associated with microorganisms, or the products of their metabolic activities including enzymes, exopolymers, organic and inorganic acids, as well as volatile compounds such as ammonia or hydrogen sulfide. These can affect cathodic and/or anodic reactions, thus altering electrochemistry at the biofilm/metal interface. Various mechanisms of biocorrosion, reflecting the variety of physiological activities carried out by different types of microorganisms, are identified and recent insights into these mechanisms reviewed. Many modern investigations have centered on the microbially-influenced corrosion of ferrous and copper alloys and particular microorganisms of interest have been the sulfate-reducing bacteria and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Corrosion; Steel; Sulfate-reducing bacteria; Surface spectroscopy.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000300001

Cupric citrate as growth promoter for broiler chickens in different rearing stages
Provedor de dados: 63
Autores: Brainer,Mônica Maria de Almeida; Menten,José Fernando Machado; Vale,Marcos Martinez do; Morais,Sônia Cristina Daroz de.
Feeding cupric citrate as alternative to cupric sulfate to broilers has been suggested in the literature. Day-old male broiler chicks (1,200) were used in an experiment to evaluate the efficacy of cupric citrate supplementation (75 mg Cu kg-1) during the 1-21, 22-42 or 1-42 d periods in comparison to an unsupplemented diet and a diet supplemented with cupric sulfate (200 mg Cu kg-1, 1-42 d). A randomized block design was used, with five treatments, six replicates and 40 birds per pen. The diets, based on corn and soybean meal, and water were offered ad libitum during the 42-day experimental period. Over the entire period, there was no effect of copper supplementation (P &gt; 0.05) on bird live weight, weight gain, feed intake, feed conversion and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler litter; Poultry; Copper; Performance.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300004

Copper desorption in a soil with variable charge
Provedor de dados: 63
Autores: Casagrande,José Carlos; Jordão,Camila Beig; Alleoni,Luís Reynaldo Ferracciú; Camargo,Otávio Antônio de.
Adsorption processes of heavy metals in soils have been more extensively studied than desorption, in spite of this latter process being related to nutrient bioavailability in the soil solution. Copper desorption from surface (0-0.2 m) and subsurface (1.0 - 1.2 m) samples of an Anionic Acrudox was studied at two pH values (4.5 and 7.5). Soil samples were incubated with Cu rates varying from 0 to 400 mg kg-1, during 4 and 12 weeks, in the presence of CaCl2 as support electrolyte at concentrations of 0.01 and 0.001 mol L-1. Complete soil adsorption of added Cu was observed at pH 7.5 in all incubation periods, indicating that a 24h-shaking period was enough to reach equilibrium and maximum adsorption. Copper adsorption varied with the incubation period and was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Desorption; Ionic strength; PH.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200012

Assessment of heavy metals in soils of a vineyard region with the use of principal component analysis
Provedor de dados: 63
Autores: Valladares,Gustavo Souza; Camargo,Otávio Antônio de; Carvalho,José Ruy Porto de; Silva,Alessandra Maria Cia.
Agricultural management with chemicals may contaminate the soil with heavy metals. The objective of this study was to apply Principal Component Analysis and geoprocessing techniques to identify the origin of the metals Cu, Fe, Mn, Zn, Ni, Pb, Cr and Cd as potential contaminants of agricultural soils. The study was developed in an area of vineyard cultivation in the State of São Paulo, Brazil. Soil samples were collected and GPS located under different uses and coverings. The metal concentrations in the soils were determined using the DTPA method. The Cu and Zn content was considered high in most of the samples, and was larger in the areas cultivated with vineyards that had been under the application of fungicides for several decades. The concentrations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PCA; GIS; Soil pollution; Copper; Zinc.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300011

Copper toxicity for Scinax ruber and Rhinella granulosa (Amphibia: Anura) of the Amazon: Potential of Biotic Ligand Model to predict toxicity in urban streams
Provedor de dados: 36
Autores: Franco-de-Sá,Jorge Felipe Oliveira; Val,Adalberto Luis.
In the last years many populations of anurans have declined and extinctions have been recorded. They were related to environmental pollution, changes of land use and emerging diseases. The main objective of this study was to determine copper sensitivity of the anuran of the Amazon Rhinella granulosa and Scinax ruber tadpoles at stage 25 and Scinax ruber eggs exposed for 96 h to copper concentrations ranging from 15 µg Cu L-1 to 94 µg Cu L-1. LC50 at 96 h of Rhinella granulosa Gosner 25, Scinax ruber Gosner 25 and Scinax ruber eggs in black water of the Amazon were 23.48, 36.37 and 50.02 µg Cu L-1, respectively. The Biotic Ligand Model was used to predict the LC50 values for these species and it can be considered a promising tool for these tropical species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibian; LC50-96h; Copper; BLM; Water pollution.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400010

Effect of liming on micronutrient availability to soybean grown in soil under different lengths of time under no tillage
Provedor de dados: 1
Autores: Moreira, Silvino Guimarães; Prochnow, Luís Ignácio; Pauletti, Volnei; Silva, Bruno Montoani; Kiehl, Jorge de Castro; Silva, Carine Gregório Machado.
The effect of liming on the availability of micronutrients to soybean cultivated during different numbers of years under no tillage (NT) was investigated. The treatments consisted of the number of years under NT (three, six, and nine years) and five rates of lime (0, 33, 67 and 100% of the amount calculated to raise soil base saturation to 70%) broadcast on soil surface plus the rate of 100% broadcast with incorporation in the 0-0.20 m layer of a clayey Red Oxisol. Soil and leaf samples were collected at two vegetative stages of the crop (vegetative V4 and blossoming R2). The soil was sampled at depths of 0-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.30 m. Surface liming had little effect on extractable soil micronutrient and nutrient concentrations in soybean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Iron; Manganese; Zinc; No till Fertilidade do solo.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30691

Exigência líquida de zinco, cobre e ferro para cordeiros em pastejo no semiárido - doi: 10.4025/actascianimsci.v32i3.5883
Provedor de dados: 2
Autores: Mendes, Rodrigo de Souza; UFCG; Silva, Aderbal Marcos de Azevêdo; UFCG; Silva, Guilherme de Lira Sobral; UFCG; Nóbrega, Giovanna Henriques da; UFCG; Lôbo, Katiuscia Menezes; UFCG; Pereira Filho, José Morais; UFCG.
Este trabalho teve por objetivo determinar as exigências líquidas de zinco (Zn), cobre (Cu) e ferro (Fe) de cordeiros Santa Inês em pastejo na região semiárida. Os animais com peso vivo entre 20 e 30 kg apresentaram conteúdo corporal no peso de corpo vazio (PCV) para esses minerais de 60,26 a 76,37 mg kg-1, 10,78 a 16,72 mg kg-1 e 133,44 a 126,98 mg kg-1, respectivamente. Observou-se que com o aumento do PCV, as concentrações de Cu e Zn também aumentavam, enquanto a de Fe diminuía. As exigências líquidas para cordeiros em regime de pastejo variaram de 1,69 a 7,86 mg dia-1 para Cu e 7,20 a 27,4 mg dia-1 para Zn. Os resultados obtidos no presente trabalho, para exigências desses minerais, foram maiores do que as exigências dietéticas recomendadas pelo do NRC...
Tipo: Pesquisa de campo
Palavras-chave: Zootecnia composição corporal; Exigências nutricionais; Ferro; Cobre; Zinco; Exigências dietéticas Zootecnia body composition; Nutritional requirements; Iron; Copper; Zinc; Dietary requirements.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5883

Evaluation of the potential of Pontederia parviflora Alexander in the absorption of copper (Cu) and its effects on tissues - doi: 10.4025/actascibiolsci.v32i3.3940
Provedor de dados: 3
Autores: Balassa, Graziela Custodio; Universidade Tecnológica Federal do Paraná; Souza, Débora Cristina de; Universidade Tecnológica Federal do Paraná - Campus Campo Mourão; Lima, Sônia Barbosa de; Universidade Tecnológica Federal do Paraná - Campus Campo Mourão.
The study sought to evaluate the potential of the aquatic macrophyte Pontederia parviflora Alexander in the absorption of copper (Cu) and possible variations in its tissues after 21 days of exposure to this metal. The concentration of Cu was analyzed in the solution and in the vegetal tissues (stem, root and leaves). The experiment was set up in triplicates with weekly measurements of pH, temperature and DO. The results indicated that P. parviflora reduced 96% of Cu in the solution and the root was the vegetal tissue, which accumulated more Cu. Values of pH, DO and temperature were in accordance with the metabolic activities of the plants. In the anatomic analyses, dark spots were identified in the vascular bundles and in the epidermis of the aerial parts,...
Palavras-chave: 2.05.03.00-8 aquatic macrophyte; Phytoremediation; Copper Ecologia aplicada aquatic macrophyte; Phytoremediation; Copper.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/3940

Copper Stress on Photosynthesis of Black Mangle (Avicennia germinans)
Provedor de dados: 42
Autores: GONZALEZ-MENDOZA,DANIEL; GIL,FRANCISCO ESPADAS y; ESCOBOZA-GARCIA,FERNANDO; SANTAMARIA,JORGE M.; ZAPATA-PEREZ,OMAR.
The effects of copper toxicity on the photosynthetic activities of Avicennia germinans was investigated using two CuSO4 concentrations (0.062 and 0.33 M) added in Hoagland's solution in an aerated hydroponic system. Photosynthesis and chlorophyll fluorescence were measured after 30 h of copper stress. Results obtained in this study show that increasing levels of Cu+2 of 0.062 and 0.33 M Cu+2 resulted in a general reduction of the stomatal conductance (28 and 18%, respectively) and 100% of inhibition of net photosynthesis. Additionally, at these concentrations of Cu+2, reductions of chlorophyll fluorescence parameters were also observed. These changes suggested that the photosynthetic apparatus of Avicennia germinans was the primary target of the Cu+2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avicennia germinans; Chlorophyll fluorescence; Copper; Photosystem II; Photosynthesis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200665

The functional links between prion protein and copper
Provedor de dados: 48
Autores: VARELA-NALLAR,LORENA; TOLEDO,ENRIQUE M; CHACÓN,MARCELO A; INESTROSA,NIBALDO C.
Prion diseases are fatal neurodegenerative disorders associated with the conversion of the cellular prion protein (PrPC) into a pathologic isoform. Although the physiological function of PrPC remains unknown, evidence relates PrPC to copper metabolism and oxidative stress as suggested by its copper-binding properties in the N-terminal octapeptide repeat region. This region also reduces copper ions in vitro, and this reduction ability is associated with the neuroprotection exerted by the octarepeat region against copper in vivo. In addition, the promoter region of the PrPC gene contains putative metal response elements suggesting it may be regulated by heavy metals. Here we address some of the evidence that support a physiological link between PrPC and...
Tipo: Journal article
Palavras-chave: Prion protein; Copper; Heparin; HSPG; Prnp; MRE.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100005

Cloning and functional characterization of the gene encoding the transcription factor Acel in the basidiomycete Phanerochaete chrysosporium
Provedor de dados: 48
Autores: POLANCO,RUBÉN; CANESSA,PAULO; RIVAS,ALEXIS; LARRONDO,LUIS F; LOBOS,SERGIO; VICUÑA,RAFAEL.
In this report we describe the isolation and characterization of a gene encoding the transcription factor Acel (Activation protein of cup 1 Expression) in the white rot fungus Phanerochaete chrysosporium. Pc-acel encodes a predicted protein of 633 amino acids containing the copper-fist DNA binding domain typically found in fungal transcription factors such as Acel, Macl and Haal from Saccharomyces cerevisiae. The Pc-acel gene is localized in Scaffold 5, between coordinates 220841 and 222983. A S. cerevisiae acel null mutant strain unable to grow in high-copper medium was fully complemented by transformation with the cDNA of Pc-acel. Moreover, Northern blot hybridization studies indicated that Pc-acel cDNA restores copper inducibility of the yeast cup 1...
Tipo: Journal article
Palavras-chave: Acel; Basidiomycete; Copper; Phanerochaete chrysosporium.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000500007

Vesicular transport of Fe and interaction with other metal ions in polarized Caco2 Cell monolayers
Provedor de dados: 48
Autores: LINDER,MARIA C; MORIYA,MIZUE; WHON,ANNE; KASSA,AZEB; GILLEY,CYNTHIA.
Two aspects of the mechanisms by which iron is absorbed by the intestine were studied in the Caco2 cell model, using 59Fe(II)-ascorbate. Data showing the importance of vesicular processes and cycling of apotransferrin (apoTf) to uptake and overall transport of Caco2 cell monolayers (or basolateral 59Fe release) were obtained by comparing effects of: a) adding apoTf to the basal chamber; b) adding vesicular transport inhibitors; or c) cooling to 4ºC. These showed that apoTf may be involved in as much as half of Fe transfer across the basolateral membrane, and that vesicular processes may also play a role in non-apoTf-dependent Fe transport. Studies were initiated to examine potential interactions of other metal ions with Fe(II) via DMT1. Kinetic data showed...
Tipo: Journal article
Palavras-chave: Intestinal iron absorption; Caco2 cells; Apotransferrin; Vesicular transport; Copper; Manganese.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100016

Sublethal concentrations of waterborne copper induce cellular stress and cell death in zebrafish embryos and larvae
Provedor de dados: 48
Autores: Hernandez,Pedro P; Undurraga,Cristian; Gallardo,Viviana E; Mackenzie,Natalia; Allende,Miguel L; Reyes,Ariel E.
Copper is an essential ion that forms part of the active sites of many proteins. At the same time, an excess of this metal produces free radicals that are toxic for cells and organisms. Fish have been used extensively to study the effects of metals, including copper, present in food or the environment. It has been shown that different metals induce different adaptive responses in adult fish. However, until now, scant information has been available about the responses that are induced by waterborne copper during early life stages of fish. Here, acute toxicity tests and LC50 curves have been generated for zebrafish larvae exposed to dissolved copper sulphate at different concentrations and for different treatment times. We determined that the larvae...
Tipo: Journal article
Palavras-chave: Acute exposure; Apoptosis; Copper; Early life stage; Heat shock; Protein-70; Zebrafish.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100002

Divalent cations as modulators of neuronal excitability: Emphasis on copper and zinc
Provedor de dados: 48
Autores: DELGADO,RICARDO; VERGARA,CECILIA; WOLFF,DANIEL.
Based on indirect evidence, a role for synaptically released copper and zinc as modulators of neuronal activity has been proposed. To test this proposal directly, we studied the effect of copper, zinc, and other divalent cations on voltage-dependent currents in dissociated toad olfactory neurons and on their firing rate induced by small depolarizing currents. Divalent cations in the nanomolar range sped up the activation kinetics and increased the amplitude of the inward sodium current. In the micromolar range, they caused a dose dependent inhibition of the inward Na+ and Ca2+ currents (I Na and I Ca) and reduced de amplitude of the Ca2+-dependent K+ outward current (I Ca-K). On the other hand, the firing rate of olfactory neurons increased when exposed to...
Tipo: Journal article
Palavras-chave: Copper; Zinc; Modulators; Channels; Neuronal excitability.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100019

Optimization of biomass production with copper bioaccumulation by yeasts in submerged fermentation
Provedor de dados: 52
Autores: Arakaki,Andréa Haruko; Souza Vandenberghe,Luciana Porto de; Soccol,Vanete Thomaz; Masaki,Ryu; Rosa Filho,Ernani Francisco da; Gregório,Alexsandro; Soccol,Carlos Ricardo.
The objective of this work was to study the production of biomass with copper bioaccumulation in submerged fermentation using sugarcane molasses. Candida pelliculosa BARU 05 isolated from Baru (Dipteryx alata) was selected for its good capacity to accumulate the copper. Fermentation was carried out using the medium composed by sugarcane molasses at 5 °Brix enriched with (g/L) CuSO4.5H2O 0.1; yeast extract, 10.0; (NH4)2SO4, 5.0 ; KH2PO4, 5.0 MgSO4, 0.5, inoculum 10 % of total volume (100 ml), pH 6.0, and incubation at 30 °C, 120 rpm for 120 h. After three steps of optimization an uptake of 95.04% and 13.397 g/L biomass were obtained. The kinetics of copper bioaccumulation and biomass production was followed in a 10- liter bioreactor in a batch and fed-batch...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioaccumulation; Baru; Yeast; Copper; Sugarcane molasses.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500021

Copper improves the production of laccase by the white-rot fungus Pleurotus pulmonarius in solid state fermentation
Provedor de dados: 52
Autores: Tychanowicz,Giovana Kirst; Souza,Daniela F. de; Souza,Cristina G. M.; Kadowaki,Marina Kimiko; Peralta,Rosane Marina.
Pleurotus pulmonarius (Fr) Quélet, produced laccase as the main ligninolytic enzyme when cultivated on solid-state cultures using corn cob as substrate. The addition of copper greatly increased the production of enzyme. The addition of 25.0 mM CuSO4 increased the level of laccase from 270 to 1,420 U.L-1 and the fungus showed high resistance to copper under the conditions used in this work.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Laccase; Pleurotus pulmonarius; Phenoloxidase; Solid state fermentation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000600002

Sobre a Dosagem Fotométrica do Cobre em Águas
Provedor de dados: 52
Autores: Spitzner,Reinaldo.
The author presents an analytic process for copper quantitative determination in mineral and potable waters, based in the reaction of the cation copper with sodium diethyl-dithio carbamate. Due to the presence of certain elements common in water, such as iron, calcium, magnesium, etc., the main principles of the reactions behavior were studied. In the same manner the reaction sensibility was verified, as well as its precision, by the addition of known quantities of copper. About the end of the work presented, there are shown some copper determinations made through the mentioned process with mineral and potable waters of Paraná.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Photometry; Mineral waters.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000500004

Correlation between heavy metal ions (copper, zinc, lead) concentrations and root length of Allium cepa L. in polluted river water
Provedor de dados: 52
Autores: Palacio,Soraya Moreno; Espinoza-Quiñones,Fernando Rodolfo; Galante,Raquel Manozzo; Zenatti,Dilcemara Cristina; Seolatto,Araceli Aparecida; Lorenz,Evandro Kleber; Zacarkim,Carlos Eduardo; Rossi,Nickeli; Rizzutto,Márcia de Almeida; Tabacniks,Manfredo Harri.
The present work was performed using the common onion (Allium cepa L.) as a bioindicator of toxicity of heavy metals in river water. The test waters were collected at two sampling sites: at the beginning and the end of the Toledo River. The bulbs of A. cepa L. were grown in test water with nine concentration levels of copper, zinc and lead from 0.1 to 50 ppm. In the laboratory, the influence of these test liquids on the root growth was examined during five days. For test liquids containing below 0.03-ppm dissolved Cu the root growth was reduced by 40% However, the same reduction occurred for 1-ppm dissolved Zn. For dissolved Pb, results reveal toxicity above 0.1 and 0.6 ppm at the beginning and the end of the Toledo river water, respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute toxicity; Bioassay; Copper; Zinc; Lead; Allium cepa L.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400024

Copper Induced Lysosomal Membrane Destabilisation in Haemolymph Cells of Mediterranean Green Crab (Carcinus aestuarii, Nardo, 1847) from the Narta Lagoon (Albania)
Provedor de dados: 52
Autores: Aliko,Valbona; Hajdaraj,Gerta; Caci,Atenisa; Faggio,Caterina.
ABSTRACTDestabilisation of blood cell lysosomes in Mediterranean green crabCarcinus aestuarii was investigated using Neutral Red Retention Assay (NRRA). Crabs collected in Narta Lagoon, Vlora (Albania) during May 2014 were exposed in the laboratory to sub-lethal, environmentally realistic concentrations of copper. Neutral Red Retention Time (NRRT) and glucose concentration in haemolymph of animals were measured. The mean NRRT showed a significant reduction for the animals of the treatment group compared to the control one (from 118.6 ± 28.4 to 36.4 ± 10.48 min, p&lt;0.05), indicating damage of lysosomal membrane. Haemolymph glucose concentration was significantly higher in the treatment group (from 37.8 ± 2.7 to 137.8.4 ± 16.2 mg/dL, p&lt;0.05) than in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcinus aestuarii; Neutral red retention assay; Lysosomal membrane destabilization; Bioindicator; Copper.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500750

Distribution of copper in soil and rice system of Hainan Island, China
Provedor de dados: 52
Autores: Dengfeng,WANG; Haijie,HUANG; Huande,FENG; Hua,WANG; Miaojie,HAN; Zhiping,QI.
ABSTRACT This research aimed to discover the distribution and the primary influence factors of Cu in the soil-rice systems of tropical farmland. Soil samples of farmland and rice plant (stalk and polished rice) from the western region of Hainan Island were collected and studied. The results showed that the average Cu content in the topsoil of the study area was 15.75 mg kg-1; the highest Cu content (45.92 mg kg-1) was found in the rice fields of the northern area, where pyroclastic parent material is distributed. Thus, there is a potential for Cu contamination of the rice grown in this region. The average contents of Cu in the rice stalks and polished rice were 16.9 and 5.68 mg kg-1, respectively, indicating that the stalks had a larger capacity for Cu...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice; Copper; Arable land; Hainan.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000200703

Insights into the physiological function of cellular prion protein
Provedor de dados: 56
Autores: Martins,V.R.; Mercadante,A.F.; Cabral,A.L.B.; Freitas,A.R.O.; Castro,R.M.R.P.S.
Prions have been extensively studied since they represent a new class of infectious agents in which a protein, PrPsc (prion scrapie), appears to be the sole component of the infectious particle. They are responsible for transmissible spongiform encephalopathies, which affect both humans and animals. The mechanism of disease propagation is well understood and involves the interaction of PrPsc with its cellular isoform (PrPc) and subsequently abnormal structural conversion of the latter. PrPc is a glycoprotein anchored on the cell surface by a glycosylphosphatidylinositol moiety and expressed in most cell types but mainly in neurons. Prion diseases have been associated with the accumulation of the abnormally folded protein and its neurotoxic effects;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PrPc; Cellular function; Transmissible spongiform encephalopathies; Laminin; Signal transduction; Copper.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000500005

Copper influence on polyphosphate metabolism of Cunninghamella elegans
Provedor de dados: 58
Autores: Souza,Patrícia Mendes de; Marinho,Petrusk Homero; Lima,Marcos Antônio Barbosa de; Nascimento,Aline Elesbão do; Takaki,Galba Maria de Campos.
The aim of this work was to evaluate the physiological aspects of polyphosphate metabolism of Cunninghamella elegans grown in presence of copper. The growth profile was obtained by means of biomass yields, orthophosphate consumption, polyphosphate accumulation and phosphatases activities. The results revealed the influence of copper on the growth, observed by biomass yields. Orthophosphate consumption was faster in cells grown in the presence of copper. The presence of copper in the culture medium induced polyphosphate accumulation. The polyphosphate level was almost constant in the beginning of control culture growth, and could be related to the exponential growth phase. On the other hand, the copper treated cultures exhibited a significant reduction in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cunninghamella elegans; Copper; Polyphosphate; Phosphatases.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400002

Relationship between Paratuberculosis and the microelements Copper, Zinc, Iron, Selenium and Molybdenum in Beef Cattle
Provedor de dados: 58
Autores: Paolicchi,F.; Perea,J.; Cseh,S.; Morsella,C.
To study the deficiency of minerals and its relationship with Paratuberculosis, blood, serum, and fecal samples were obtained from 75 adult bovines without clinical symptoms of the disease and from two bovines with clinical symptoms of the disease, from two beef herds with a previous history of Paratuberculosis in the Province of Buenos Aires, Argentina. Serum samples were processed by ELISA and feces were cultured in Herrolds medium. Copper, zinc and iron in serum were quantified by spectrophotometry and selenium was measured by the activity of glutathione peroxidase. We also determined copper, zinc, iron and molybdenum concentrations in pastures and the concentration of sulfate in water. Mycobacterium avium subsp paratuberculosis (Map) was isolated from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paratuberculosis; Micronutrients; Selenium; Molybdenum; Copper.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000100022

Changes in nitrate reductase activity and oxidative stress response in the moss Polytrichum commune subjected to chromium, copper and zinc phytotoxicity
Provedor de dados: 61
Autores: Panda,Sanjib Kumar; Choudhury,Shuvasish.
The main aim of this paper was to investigate the effect of chromium (Cr), copper (Cu) and zinc (Zn) on nitrate reductase (NR) activity and oxidative stress responses in the moss Polytrichum commune. Cr, Cu and Zn resulted in the inhibition of NR activity. A decline in total chlorophyll content was observed after 24 and 48 h of metal treatment. Accumulation of the metals showed a dose and time dependent increase. High accumulation of Cu, Cr and Zn were seen in moss shoots after 24 and 48 h of treatment. Treatment of Cr, Cu and Zn for 24 or 48 h resulted in the increase of malondialdehyde (MDA) content in moss shoots. The highest increase was observed in shoots under Cu treatment followed by Cr and Zn. The MDA content was significantly higher after 48h....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidants; Chromium; Copper; Malondialdehyde; Nitrate reductase; Oxidative stress; Polytrichum commune; Zinc.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200001

Changes induced by Cu2+ and Cr6+ metal stress in polyamines, auxins, abscisic acid titers and antioxidative enzymes activities of radish seedlings
Provedor de dados: 61
Autores: Choudhary,Sikander P.; Bhardwaj,Renu; Gupta,Bishan D.; Dutt,Prabhu; Gupta,Rajinder K.; Kanwar,Mukesh; Dutt,Pitamber.
The present study determined the effects of copper and chromium metals on the endogenous titers of polyamines, auxins, abscisic acid and antioxidative enzyme activities in Raphanus sativus L. cv. Pusa chetki seedlings. Among polyamines, putrescine and spermidine contents were enhanced by Cu2+ metal to 62.44 and 402.8 µg g-1 f.w. respectively over control. Spermine which was not observed in control was recorded in highest concentration (1287.9 µg g-1 f.w.) in Cu2+ metal stressed seedlings. On the other hand Cr6+ metal treated seedlings showed reduced contents of putrescine (1.43 µg g-1 f.w.), cadaverine (0.09 µg g-1 f.w.), spermidine (277.99 µg g-1 f.w.) and spermine (2.29 µg g-1 f.w.) when compared to control and Cu2+ metal treated seedlings. Significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Chromium; Copper; Guaiacol peroxidase; Polyamines (PAs); Superoxide dismutase.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000400006

Transport and detoxification of manganese and copper in plants
Provedor de dados: 61
Autores: Ducic,Tanja; Polle,Andrea.
Heavy metals like Mn and Cu, though essential for normal plant growth and development, can be toxic when present in excess in the environment. For normal plant growth maintenance of metal homeostasis is important. Excess uptake of redox active elements causes oxidative destruction. Thus, uptake, transport and distribution within the plant must be strongly controlled. Regulation includes precisely targeted transport from the macro-level of the tissue to the micro-level of the cell and organelles. Membrane transport systems play very important roles in metal trafficking. This review provides a broad overview of the long distance and cellular transport as well as detoxification and homeostasis mechanisms of Mn and Cu, which are essential micronutrients but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Heavy metals; Manganese; Phytoremediation; Transport.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100009

Micronutrient concentration in potato clones with distinct physiological sensitivity to Al stress
Provedor de dados: 65
Autores: Tabaldi,Luciane Almeri; Castro,Gabriel Y; Cargnelutti,Denise; Skrebsky,Etiane Caldeira; Gonçalves,Jamile Fabbrin; Rauber,Renata; Rossato,Liana; Schetinger,Maria Rosa Chitolina; Bisognin,Dílson Antônio; Nicoloso,Fernando Teixeira.
The objective of this study was to evaluate the effects of aluminum (Al) on the zinc (Zn), manganese (Mn), iron (Fe) and copper (Cu) concentrations in four potato clones (Macaca and Dakota Rose: both Al-sensitive clones; and SMIC148-A and Solanum microdontum: both Al-tolerant-clones), grown in a nutrient solution (pH 4.00) with 0, 50, 100, 150 and 200mg Al L-1. Root Zn and Fe concentrations decreased linearly with the increase of Al levels in Macaca, SMIC148-A and Dakota Rose and increased linearly in S. microdontum. Shoot Zn concentration showed a quadratic relationship with Al in S. microdontum and SMIC148-A, but a curvilinear response in Dakota Rose. Shoot Fe concentration showed a quadratic relationship with Al in S. microdontum, SMIC148-A and Dakota...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Solanum microdontum; Zinc; Manganese; Iron; Copper.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000200010