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A voltammetric study of the binding of copper (II) to peptide fragments of prion. Repositório Alice
CASTRO, C. S. P. de; SOUZA, J. R. de; BEMQUERER, M. P.; OLIVEIRA FILHO, W. P. de.
Tipo: Anais e Proceedings de eventos Palavras-chave: Anodic stripping voltammetry; Peptide fragment; Prion; Spongiform ancephalopathie; Copper.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/578796
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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
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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: Parte de livro Palavras-chave: Pacu; Peixe de água doce; Cobre; Toxidez; Antioxidant activity; Hypercapnia; Copper.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/917833
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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..
Tipo: Separatas Palavras-chave: Pacu.; Antioxidant activity; Hypercapnia; Copper.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/917478
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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 de periódico Palavras-chave: Análise de componentes principais.; Cobre; Zinco; Poluição do Solo.; Principal component analysis; Geographic information systems; Soil pollution; Copper; Zinc.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/575988
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Assessment of heavy metals in soils of a vineyard region with the use of principal component analysis Scientia Agricola
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
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Assessment of micronutrient extractants from soils of Paraná, Brazil Rev. Bras. Ciênc. Solo
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
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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: Anais e Proceedings de eventos 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/alice/handle/doc/977384
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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
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Changes in nitrate reductase activity and oxidative stress response in the moss Polytrichum commune subjected to chromium, copper and zinc phytotoxicity Braz. J. Plant Physiol.
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
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Changes induced by Cu2+ and Cr6+ metal stress in polyamines, auxins, abscisic acid titers and antioxidative enzymes activities of radish seedlings Braz. J. Plant Physiol.
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
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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
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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
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Concentração de B, Cu, Fe, Mn e Zn em plantas de malva (Urena lobata L.) variedade BR-01, cultivada em solução nutritiva com omissão de macro e micronutrientes. Repositório Alice
FASABI, J. A. V.; CARVALHO, J. G. de; VIEGAS, I. de J. M..
Tipo: Artigo de periódico Palavras-chave: Nutrição mineral; Mineral nutrientes; Boro; Cobre; Ferro; Malva; Manganês; Urena Lobata; Zinco; Boron; Copper; Iron; Manganese; Zinc.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/373151
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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
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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 de periódico Palavras-chave: Processos da rizosfera; Solos de vinhedos; Cu toxicidade; Rhizosphere processes.; Cu toxicity; Cobre; Copper; Vineyard soils..
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1060600
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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 de periódico 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
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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 de periódico 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
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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
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Copper desorption in a soil with variable charge Scientia Agricola
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
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