Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 66
Primeira ... 1234 ... Última
Imagem não selecionada

Imprime registro no formato completo
Accumulation capacity of cadmium and copper and their effects on photosynthetic performance in Azolla filiculoides Lam. under induced rhizofiltration Gayana Botánica
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
Imagem não selecionada

Imprime registro no formato completo
Antioxidant activity and phenolic contents of Olea europaea L. leaves sprayed with different copper formulations IPB - Escola Superior Agrária
Ferreira, Isabel C.F.R.; Barros, Lillian; Soares, Maria Elisa; Bastos, Maria de Lourdes; Pereira, J.A..
Olive trees (Olea europaea L. Cv. Cobranc¸osa) from the northeast of Portugal were sprayed with three different copper formulations [bordeaux mixture (copper sulphate + calcium hydroxide - 20% Cu), copper hydroxide (40% Cu) and copper oxychloride (50% Cu)] to control olive fungal diseases. The residues of copper in olive leaves, harvested at different times, were evaluated by atomic absorption spectrometry. At all the collection times, treated olive leaves had significantly higher copper contents, compared to the control. The different copper amounts in pesticide formulations lowered the leaves contents in total phenols and hence their antioxidant properties. Olive leaves sprayed with copper oxychloride possessed the highest copper levels and the lowest...
Tipo: Article Palavras-chave: Olea europaea; Olive leaves; Copper; Phenols; Antioxidant activity.
Ano: 2007 URL: http://hdl.handle.net/10198/749
Imagem não selecionada

Imprime registro no formato completo
Antioxidant defenses and biochemical changes in pacu in response to single and combined copper and hypercapnia exposure. Repositório Alice
SAMPAIO, F. G.; BOIJINK, C. de L.; TIE OBA, E.; SANTOS, L. R. B. dos; KALININ, A. L.; LUIZ, A. J. B.; RANTIN, F. T..
2011
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Pacu; Antioxidant activity; Hypercapnia; Copper.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/917478
Imagem não selecionada

Imprime registro no formato completo
Antioxidant defenses and biochemical changes in pacu in response to single and combined copper and hypercapnia exposure. Repositório Alice
SAMPAIO, F. G.; BOIJINK, C. de L.; TIE OBA, E.; SANTOS, L. R. B. dos; KALININ, A. L.; LUIZ, A. J. B.; RANTIN, F. T..
This study investigate the pontentially detrimental effects of CO2 and its combination with copper on pacu.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Pacu; Peixe de água doce; Cobre; Toxidez; Antioxidant activity; Hypercapnia; Copper.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/917833
Imagem não selecionada

Imprime registro no formato completo
Assessment of heavy metals in soils of a vineyard region with the use of principal component analysis. Repositório Alice
VALLADARES, G. S.; CAMARGO, O. A. de; CARVALHO, J. R. P. de; SILVA, A. M. C..
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: Artigo em periódico indexado (ALICE) Palavras-chave: Poluição do solo; Análise de componentes principais; Cobre; Zinco; Principal component analysis; Geographic information systems; Soil pollution; Copper; Zinc.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/575988
Imagem não selecionada

Imprime registro no formato completo
Avaliação da presença de metais pesados em nove méis produzidos e comercializados no Distrito Federal. Repositório Alice
ROSA-CAMPOS, A. A.; ROCHA, J. E. da S.; BORGO, L. A.; SILVA, M. S. da..
Resumo: O mel brasileiro é produzido principalmente por abelhas africanizadas a partir do néctar ou da secreção das plantas e, devido às suas características genéticas dessas espécies de abelhas, dispensa o uso de antibióticos e pesticidas, como acaricidas e fungicidas. A composição das amostras de méis está intimamente relacionada com o tipo de florada utilizada por estas abelhas para a elaboração do produto final. Um dos componentes de grande importância são os minerais presentes no mel que representam de 0,02% a 1%. Dentre estes minerais observamos os chamados metais pesados, que podem indicar tanto a origem geográfica do mel quanto o nível de poluição ambiental por estes metais. Logo, faz-se necessário a pesquisa da presença ou não de metais pesados...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Abelha; Mel; Metal pesado; Chumbo; Cobre; Cromo; Níquel; Zinco; Honey bees; Honey; Heavy metals; Lead; Copper; Chromium; Nickel; Zinc.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/977384
Imagem não selecionada

Imprime registro no formato completo
Bioaccumulation of metals by Mugil saliens under chronic exposure to contamined sediments: Gill histopathological changes IPB - Escola Superior Agrária
Fernandes, Conceição; Fontaínhas-Fernandes, A.; Monteiro, M.; Salgado, M.A..
The Esmoriz/Paramos coastal lagoon, is a habitat of ecological importance due to the presence of unique animal and plant species. During the past few years its immersed area has been gradually reduced due to effluent discharges and siltation. The major contaminants in the lagoon are derived from a multitude of nonpoint sources associated with urbanization and industrial activities within the watershed. Heavy metals are probably a class of pollutants contributing to the observed decline of fish species. The metal content in the water and sediments in the lagoon were investigated as well as gill metal bioaccumulation and gill histopathological changes of the grey leaping mullet, Mugil saliens.
Tipo: ConferenceObject Palavras-chave: Chronic exposure; Mugil saliens; Gill histopathology; Copper; Zinc.
Ano: 2005 URL: http://hdl.handle.net/10198/6012
Imagem não selecionada

Imprime registro no formato completo
Can pesticides, copper and seasonal water temperature explain the seagrass Zostera noltei decline in the Arcachon bay? ArchiMer
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
Imagem não selecionada

Imprime registro no formato completo
Cloning and functional characterization of the gene encoding the transcription factor Acel in the basidiomycete Phanerochaete chrysosporium Biol. Res.
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
Imagem não selecionada

Imprime registro no formato completo
Cobre e virginiamicina como promotores do crescimento de suinos. Repositório Alice
BELLAVER, C.; GOMES, P.C.; COSTA, V.; FIALHO, E. T.; FREITAS, A. R. de..
Com objetivo de avalir os efeitos do cobre e virginiamicina usados como promotores de crescimento de suinos atraves de variaves de desempenho e caracteristicas de carcaca. As racoes foram formuladas a base de milho, farelo de soja, fosfato vicalcio, calcario e suplementadas com mineral e vitaminas.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Suinos; Crescimento animal; Cobre; Virginiamicina; Swines; Animal growth; Copper.
Ano: 1982 URL: http://www.alice.cnptia.embrapa.br/handle/doc/43685
Imagem não selecionada

Imprime registro no formato completo
Combined effects of antifouling biocides on the growth of three marine microalgal species ArchiMer
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
Imagem não selecionada

Imprime registro no formato completo
Concentración óptima y tóxica de cobre para el crecimiento de bacterias ruminales. Colegio de Postgraduados
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
Imagem não selecionada

Imprime registro no formato completo
Copper accumulation in vineyard soils: Rhizosphere processes and agronomic practices to limit its toxicity. Repositório Alice
BRUNETTO, G.; MELO, G. W. B. de; TERZANO, R.; DEL BUONO, D.; ASTOLFI, S.; TOMASI, N.; PII, Y.; MIMMO, T.; CESCO, S..
Viticulture represents an important agricultural practice in many countries worldwide. Yet, the continuous use of fungicides has caused copper (Cu) accumulation in soils, which represent a major environmental and toxicological concern. Despite being an important micronutrient, Cu can be a potential toxicant at high concentrations since it may cause morphological, anatomical and physiological changes in plants, decreasing both food productivity and quality. Rhizosphere processes can, however, actively control the uptake and translocation of Cu in plants. In particular, root exudates affecting the chemical, physical and biological characteristics of the rhizosphere, might reduce the availability of Cu in the soil and hence its absorption. In addition, this...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Processos da rizosfera; Solos de vinhedos; Cu toxicidade; Cobre; Copper; Rhizosphere processes; Vineyard soils; Cu toxicity.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1060600
Imagem não selecionada

Imprime registro no formato completo
Copper and zinc accumulation, fractionation and migration in vineyard soils from Santa Catarina State, Brazil. Repositório Alice
BRUNETTO, G.; COMIM, J. J.; MIOTTO, A.; MORAES, M. P.; SETE, P. B.; SCHMITT, D. E.; GATIBONI, L. C.; MELO, G. W. B. de; MORAIS, G. P..
The purpose of this study was to evaluate Cu and Zn migration and fractions in sandy soil of vineyards. In Urussanga (SC), Brazil, soil samples were collected from a 4-year-old and 15-yearold vineyard, and from a forested area. In the soils, the chemical characteristics of Cu and Zn were analyzed by the EDTA method, which determines the fraction available in soil; 3050B method of the USEPA for total concentrations, which represents the pseudosoil contents in the soil; and chemical fractionation, which estimates soluble fraction, exchangeable fraction, fraction associated with clay minerals, fraction associated with organic matter and residual fraction. The results show that there is accumulation of Cu and Zn in sandy soils cultivated with grapevines and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Availability; Chemical fractionation; Environmental contamination; Vitisvinifera; Toxicity; Copper; Zinc; Vineyard soils.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103348
Imagem não selecionada

Imprime registro no formato completo
Copper and zinc fractions in the profile of an Inceptisol cultivated with apple in southern Brazil. Repositório Alice
BRUNETTO, G.; BENEDET, L.; AMBROSINI, V. G.; COMIN, J. J.; MELO, G. W. B. de; SANTOS, M. A. dos; LOURENZI, C. R.; LOSS, A.; BELLI FILHO, P.; SCHMITT, D. E.; COUTO, R..
The present study aimed to evaluate the accumulation and distribution of Cu and Zn fractions in the profile of an Inceptisol by application of fungicides with a previous history of apple cultivation in southern Brazil. Stratified soil samples (0.0 ? 0.025 m, 0.025 ?0.050 m, 0.05 ? 0.10 m, 0.10 ? 0.15 m, 0.15 ? 0.20 m and 0.20 ? 0.40 m depth) were collected in two apple orchards (8 years old and 18 years old), and in a native pasture area adjacent to the orchards. The soil was subjected to analysis of physical and chemical properties and to chemical fractionation of Cu and Zn. The fractions of soluble, exchangeable, organic, residual and total Cu and Zn accumulated in the topsoil (0.0 ? 0.025 m) of the orchards, being higher in the orchard cultivated for 18...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Environmental contamination; Southern Brazil; Malus Domestica; Trace elements; Toxicity; Copper; Zinc; Apples.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103351
Imagem não selecionada

Imprime registro no formato completo
COPPER CRISIS AND AGRICULTURAL RENAISSANCE IN ZAMBIA: AN ECONOMY-WIDE ANALYSIS AgEcon
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
Imagem não selecionada

Imprime registro no formato completo
Copper distribution in leaves and roots of plants growing on a copper mine-tailing storage facility in northern Chile RChHN
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 (> 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
Imagem não selecionada

Imprime registro no formato completo
Copper induces expression and methylation changes of early development genes in Crassostrea gigas embryos ArchiMer
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
Imagem não selecionada

Imprime registro no formato completo
Copper levels evolution in Arcachon bay oysters : role of the regulation on antifouling paints ArchiMer
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
Imagem não selecionada

Imprime registro no formato completo
Correcao da deficiencia de cobre em lavouras de soja em solos de cerrado. Infoteca-e
GALRAO, E.Z..
1999
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Cerrado; Correcao do solo; Cobre; Soja; Glycine max; Soil amendments; Soybeans; Copper.
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/555044
Registros recuperados: 66
Primeira ... 1234 ... Última
 

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

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

Valid HTML 4.01 Transitional