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Registros recuperados: 16
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Acid vapor sample decomposition in open vessel microwave. Repositório Alice
NOGUEIRA, A. R. de A.; ARAÚJO, G. C. L.; NÓBREGA, J. A..
Micrawave decomposition has been increasingly used hr a large number of samples. A method using an open vessel microwave was used for biological sample preparation with nitric acid vapors under atmospheric pressure. A lab made Teflon@ support suited with four cups, which received the samples, was inserted in the microwave vessel. These cups were used to weight 30 mg of certi5ed re5wence materials such as spinach and apple leaves, which received 150 pL of d.i. water to improve the micrawave e%ciency. This mixture was exposed to acid vapor stemmed from 15 mL of concentrated nitrie acid plsced in the bottom of the vessel hr decompoeition. The maximum microwave temperature, 115'C, was reached in 4 min. This condition was rnaintained hr 20 min to sllow complete...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Cobalt; Microvawe; Decompostion; Acid vapor; Open vessel.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/44768
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Atomização eletrotérmica de cobalto em espectrometria de absorção atômica com filamento de tungstênio. Repositório Alice
LOPES, G. S.; NEVES, E. F. A.; OLIVEIRA, P. V.; NOGUEIRA, A. R. de A.; QUEIROZ, Z. F.; NÓBREGA, J. A.; KRUG, F. J..
1997
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Espectrometria de absorção atômica; Filamento de tungstênio; Cobalto; Tungsten; Cobalt.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/43762
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Biochemical and hematological study of goats envenomed with natural and 60Co-irradiated bothropic venom J. Venom. Anim. Toxins incl. Trop. Dis.
Lucas de Oliveira,P. C.; Sakate,M.; Madruga,R. A.; Barbosa,N. P.U..
Venoms from snakes of the Bothrops genus are proteolytic, coagulant, hemorrhagic and nephrotoxic, causing edema, necrosis, hemorrhage and intense pain at the bite site, besides systemic alterations. Many adjuvants have been added to the venom used in the sensitization of antiserum-producer animals to increase antigenic induction and reduce the envenomation pathological effects. Gamma radiation from 60Co has been used as an attenuating agent of the venoms toxic properties. The main objective was to study, comparatively, clinical and laboratory aspects of goats inoculated with bothropic (Bothrops jararaca) venom, natural and irradiated from a 60Co source. Twelve goats were divided into two groups of six animals: GINV, inoculated with 0.5mg/kg of natural...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Radiation; Bothrops jararaca; Cobalt; Goats.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992007000300003
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Cobalt and marine redox evolution ArchiMer
Swanner, Elizabeth D.; Planavsky, Noah J.; Lalonde, Stefan; Robbins, Leslie J.; Bekker, Andrey; Rouxel, Olivier; Saito, Mak A.; Kappler, Andreas; Mojzsis, Stephen J.; Konhauser, Kurt O..
Cobalt (Co) is a bio-essential trace element and limiting nutrient in some regions of the modern oceans. It has been proposed that Co was more abundant in poorly ventilated Precambrian oceans based on the greater utilization of Co by anaerobic microbes relative to plants and animals. However, there are few empirical or theoretical constraints on the history of seawater Co concentrations. Herein, we present a survey of authigenic Co in marine sediments (iron formations, authigenic pyrite and bulk euxinic shales) with the goal of tracking changes in the marine Co reservoir throughout Earthʼs history. We further provide an overview of the modern marine Co cycle, which we use as a platform to evaluate how changes in the redox state of Earthʼs surface were...
Tipo: Text Palavras-chave: Cobalt; Trace element proxies; Ocean redox; Shale; Iron formation; Pyrite.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00174/28575/26986.pdf
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Cobalt and vitamin B12 in diets for commercial laying hens on the second cycle of production Rev. Bras. Ciênc. Avic.
Kato,RK; Bertechini,AG; Fassani,EJ; Santos,CD; Dionizio,MA; Fialho,ET.
The supplementation of cobalt and vitamin B12 in diets for commercial laying hens on the second production cycle was studied. Four hundred and eighty light commercial laying hens, Lohmann LSL, were used at initial phase of forced molting laying period. The trial was conducted in a randomized design. The plots were the treatments which were constituted by combination of five cobalt levels (0.00; 0.30; 0.60; 0.90 and 1.20ppm) and two vitamin B12 levels (without and with 10µ/kg), and the split-plots were four periods (21, 42, 63 and 84 days) during the second period of production, with 4 repetitions and 12 hens per experimental unit. Food and water were provided ad libitum and eggs were collected twice daily. Performance and egg quality parameters were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cobalt; Egg production; Laying hens; Nutrition; Vitamin B12.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000100006
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Contrasting biogeochemical cycles of cobalt in the surface western Atlantic Ocean ArchiMer
Dulaquais, Gabriel; Boye, Marie; Middag, Rob; Owens, Stephanis; Puigcorbe, Viena; Buesseler, Ken; Masque, Pere; De Baar, Hein J. W.; Carton, Xavier.
Dissolved cobalt (DCo; <0.2 µm; 14 to 93 pM) and the apparent particulate cobalt (PCo; >0.2 µm; <1 to 15 pM) were determined in the upper water column (<1000 m) of the western Atlantic Ocean along the GEOTRACES-A02 section (64°N to 50°S). The lowest DCo concentrations, typical of a nutrient-type distribution were observed in surface waters of the subtropical domains. Strong linear relationships between DCo and phosphate (P) as well as meridional gradients of decreasing DCo from high latitudes were characterized and both linked to the Co biological requirement. External sources such as the Amazon and the atmospheric deposition were found to contribute significantly (>10%) to the DCo stock of the mixed layer in the equatorial and north...
Tipo: Text Palavras-chave: Cobalt; Biogeochemistry; Atlantic Ocean; Chemical Oceanography; GEOTRACES.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00241/35222/33732.pdf
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Das Sächsische Blaufarbenwesen und der Handel mit Kobaltfarben – nach Unterlagen der Bücherei der Bergakademie Freiberg Naturalis
Hammer, P..
The German word ‘Kobold’ is the term for gnomes and goblins. It appeared for the first time in connection with minerals in Agricola’s Bermannus (1530). The first practical use was in the form of zaffer or cobalt-blue. Zaffer will not melt alone, but accompanied by vitreous substances it melts into an azure colour and so used as ‘Smalte’ for glazed earthenware, for glass and china. Since 1470 the Saxony ore mountains, especially the Schneeberg district, was the most important supplier of cobalt ores. Main products of the ‘Blaufarbenwerke’ were zaffers (Safflor) cobaltoxides of different colours and smalte (Smalte) a mixture of cobaltoxides with quartz. The Electoral-Saxon blue colour was greatly appreciated. The Dutch managed in their country eight...
Tipo: Article / Letter to the editor Palavras-chave: Cobalt; Saxony; Blue-colour industry; 35.45.
Ano: 2004 URL: http://www.repository.naturalis.nl/record/215456
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Desempenho reprodutivo de bovinos na sub-região dos Paiaguas do Pantanal Mato-Grossense. II. Efeito da suplementação mineral sobre índices reprodutivos de novilhas. Repositório Alice
POTT, E.B.; TULLIO, R.R.; ALMEIDA, I.L. de; BRUM, P.A.R. de; SOUSA, J.C. de..
Foi estudado o efeito da suplementação mineral sobre o desempenho reprodutivo de novilhas neloradas em pastagem nativa, no Pantanal Mato-Grossense.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cálcio; Fósforo; Cobre; Cobalto; Iodo; Zinco; Enxofre; Elementos químicos; Macronutrientes; Micronutrientes; Deficiências minerais; Reprodução; Calcium; Phosphorus; Copper; Cobalt; Iodine; Zinc; Sulphur; Mineral deficiências; Reproduction.
Ano: 1987 URL: http://www.alice.cnptia.embrapa.br/handle/doc/41134
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Effect of cobalt on growth, pigments and the photosynthetic electron transport in Monoraphidium minutum and Nitzchia perminuta Braz. J. Plant Physiol.
El-Sheekh,M.M.; El-Naggar,A.H.; Osman,M.E.H.; El-Mazaly,E..
The unicellular green alga Monoraphidium minutum and the diatom Nitzschia perminuta were cultured under different concentrations of Co2+. Growth and pigment content were slightly increased at low concentrations and inhibited by high Co2+ concentrations. The results concerning the effect of different concentrations of Co2+ on photosynthetic O2 evolution showed a reduction in the amount of O2 evolved by each alga in response to increasing Co2+ concentrations. However, an increase in O2 evolution for both M. minutum and N. perminuta was observed at relatively low Co2+ concentrations. Photosynthetic electron transport in M. minutum was more sensitive to Co2+ toxicity than in N. perminuta. On the other hand, the effect of the heavy metal on respiration showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cobalt; Diatoms; Green algae; Pigments; Photosynthesis.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000300005
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Establishment of sensitive and resistant variety of tomato on the basis of photosynthesis and antioxidative enzymes in the presence of cobalt applied as shotgun approach Braz. J. Plant Physiol.
Hasan,Syed Aiman; Hayat,Shamsul; Wani,Arif Shafi; Ahmad,Aqil.
Cobalt (Co) affords both beneficial as well as toxic effects to plants. The present study was performed with an aim to find out the varietal differences among five tomato cultivars against the Co induced changes in growth, photosynthesis, nitrate reductase (E.C.1.6.6.1), carbonic anhydrase (E.C.4.2.1.1), antioxidative enzymes i.e. peroxidase (E.C.1.11.1.7), catalase (E.C.1.11.1.6), superoxide dismutase (E.C.1.15.1.1) and that of proline content. Seeds of tomato (varieties, K-25, NTS-9, NBR-Uday, Sarvodya, and Malti) were soaked in 0, 100, 200 or 300 µM CoCl2 for 0, 4, 8, 12 h (shotgun approach) and sampled at 30 days after sowing. All the varieties showed significantly different response to different treatment combinations. Despite substantial varietal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidative enzyme; Carbonic anhydrase; Cobalt; Nitrate reductase; Photosynthesis; Tomato.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300001
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Etude du comportement des éléments traces en milieu estuarien : approche expérimentale et modélisation : Application à l'étude de la spéciation de Cd, Co et Cs dans les estuaires majeurs français (Seine, Loire, Gironde, Rhône) ArchiMer
Dange, Catherine.
Most of trace elements have a non conservative behavior in estuarine environments. It is the case of cadmium, cobalt and caesium for which the fate in estuarine and coastal zones is largely controlled by their distribution between water and suspended particles, which generally have high residence times or can be definitely deposited in these areas. Metallic contaminants and radionuclides can be present under various species : dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated) or integrated by various mechanisms in the organisms. Such distributions are the result of processes (physical, chemical, biological) which are controlled by many factors (ionic strengh, pH, Eh, major cations concentration, nature and...
Tipo: Text Palavras-chave: Modeling; French estuaries; Caesium; Cobalt; Cadmium; Radionuclides; Trace metals; Speciation; Modélisation; Estuaires français; Cesium; Cobalt; Cadmium; Radionucléides; Métal trace; Speciation.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/these-183.pdf
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Extração de cobalto em materiais biológicos com hc1 1,0m e determinação catalitica por Sistema FIA. Repositório Alice
NOGUEIRA, A. R. de A.; SOUZA, G. B. de; ESTEVES, S. N.; MYIAZAWA, M..
Determinação catalitica por sistema FIA, e extração de cobalto em materiais biológicos com HCl 1,o m.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Cobalto; Analise por injeção em fluxo; Digestão de material biológicos; Cobalt; Flow injection analysis.
Ano: 1994 URL: http://www.alice.cnptia.embrapa.br/handle/doc/42536
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Molibdenio e cobalto na cultura da soja. Infoteca-e
SFREDO, G. J.; BORKERT, C. M.; LANTMANN, A. F.; MEYER, M. C.; MANDARINO, J. M. G.; OLIVEIRA, M. C. N. de.
bitstream/item/35355/1/1997-Circular-Tecnica.n.16-Mo-e-Co-1475x21-09.05.2011-OK.pdf
Tipo: Circular Técnica (INFOTECA-E) Palavras-chave: Micronutriente; Brasil; Parana; Maraanhao.; Adubação; Cobalto; Cerrado; Molibdênio; Soja.; Cobalt; Fertilizer application; Brazil; Molybdenum; Savannas; Soybeans; Trace elements..
Ano: 1997 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/459840
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Nutrição mineral de bovinos de corte do Pantanal Mato-Grossense: 2. Micronutrientes na Nhecolandia (Parte Central). Repositório Alice
POTT, E. B.; ALMEIDA, I. J.; BRUM, P. A. R.; COMASTRI FILHO, J. A.; POTT, A.; DYNIA, J. F..
Realatam-se resultados de analise de solos, agua, e gramineas nativas, coletadas em 1979, maio/80 e ago/80, e de figado de bovinos, nessas epocas e em fev/80, na sub-regiao de Nhecolandia, do Pantanal Mato-Grossense. Solos e gramineas foram coletados em cino unidades de paisagem : mata, cerrado, caronal, campo limpo e lagoa. Os resultados sugerem a possibilidade de ocorrencia de toxidez de ferro e manganes, durante /apos o periodo de inundacao, e de deficiencias de cobre e zinco, em determinadas epocas, na sub-regiao abrangida.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Deficiencias minerais; Toxidez; Suplementacao mineral; Pastagens nativas; Cobalto; Cobre; Ferro; Manganes; Molibdenio; Zinco; Mineral deficiencies; Toxicity; Mineral supplementatation; Native pastures; Cobalt; Cupper; Iron; Manganese; Molibdenum; Zinc.
Ano: 1989 URL: http://www.alice.cnptia.embrapa.br/handle/doc/41128
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Principais deficiências minerais em bovinos de corte. Infoteca-e
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
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Towards an atomic level understanding of niobia based catalysts and catalysis by combining the science of catalysis with surface science Anais da ABC (AABC)
Schmal,Martin; Freund,Hans-Joachim.
The science of catalysis and surface science have developed, independently, key information for understanding catalytic processes. One might argue: is there anything fundamental to be discovered through the interplay between catalysis and surface science? Real catalysts of monometallic and bimetallic Co/Nb2O5 and Pd-Co/Nb2O5 catalysts showed interesting selectivity results on the Fischer-Tropsch synthesis (Noronha et al. 1996, Rosenir et al. 1993). The presence of a noble metal increased the C+5 selectivity and decreased the methane formation depending of the reduction temperature. Model catalyst of Co-Pd supported on niobia and alumina were prepared and characterized at the atomic level, thus forming the basis for a comparison with "real" support...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Catalysis; Model catalysts; Cobalt; Palladium; Characterization; Niobia.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200016
Registros recuperados: 16
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