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| Registros recuperados: 63 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 63 | |
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