Consulta: subjectFacets:"Metal"
Registros recuperados: 19
Data/hora: 05/06/2024 14:29:51

Suplementacao mineral para gado de corte no Estado do Tocantins.
Provedor de dados: 14
Autores: LOPES, H. O. da S.; PEREIRA, E. A.; SOARES, W. V.; SANZONOWICZ, C.; PEREIRA, G.; ALMEIDA, A. D.
bitstream/item/99426/1/comtec-71.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Tocantins; Brasil; Supplements; Bone; Bovino de corte; Heavy; Mineral deficiencies; Mineral nutrients; Pasture.; Cerrado; Deficiência Mineral; Corte; Gado de Corte; Gado; Mineral; Metal; Nutriente Mineral; Nutrição Animal; Suplemento Mineral.; Animal nutrition; Beef cattle; Fluorine; Beef; Brazil; Cattle; Liver; Minerals.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/553044

Coleta seletiva: gestão ambiental preservando o futuro.
Provedor de dados: 14
Autores: GUARIENTI, E. M.; SANTANA, F. M.; VARGAS, L.; ROGOSKI, E. T. W.; CRESPI, T. B.
bitstream/item/124357/1/FD-0348.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Lixo.; Metal; Papel; Plástico; Reciclagem; Vidro.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/842961

Free-radical depolymerization with metallic catalysts of an exopolysaccharide produced by a bacterium isolated from a deep-sea hydrothermal vent polychaete annelid
Provedor de dados: 5
Autores: Petit, Anne-celine; Noiret, N; Sinquin, Corinne; Ratiskol, Jacqueline; Guezennec, Jean; Colliec-jouault, Sylvia.
Free-radical depolymerization with metallic catalysts has been investigated to depolymerize an exopolysaccharide (EPS), with a high molecular weight (&gt; 10(6) g/Mol), produced by the bacterium Alteromonas macleodii subsp. fijiensis biovar deepsane. Three metals (copper, zinc and manganese) were used either alone or mixed. These metals led to the depolymerization of the high molecular weight bacterial polysaccharide with different efficiency. This study specifies some conditions required to produce, with good reproducibility and yield, EPS derivatives of reduced molecular weight ranging from 100,000 to 20,000 g/mol. The more influential parameters are specified. This is a first study to find suitable industrial conditions in the presence of these metallic...
Tipo: Text
Palavras-chave: Bacterial exopolysaccharide; Free radical depolymerization; H202; Metal.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2146.pdf

Interspecific comparison of Cd bloaccumulation in European Pectinidae (Chlamys varia and Pecten maximus)
Provedor de dados: 5
Autores: Metian, M; Warnau, M; Oberhansli, F; Teyssie, J; Bustamante, Paco.
The uptake and loss kinetics of Cd were determined in two species of scallops from the European coasts, the variegated scallop Chlamys varia and the king scallop Pecten maximus, following exposures via seawater, phytoplankton and sediment using highly sensitive radiotracer techniques (Cd-109). Results indicate that, for seawater and dietary pathways, C. varia displays higher bioaccumulation capacities in terms of uptake rate from water and fraction absorbed from ingested food (assimilation efficiency) than Pecten maximus. Regarding sediment exposure, P. maximus displayed low steady-state Cd transfer factor (TFSS &lt; 1); however, once incorporated, a very large part of Cd transferred from sediment (92%) was strongly retained within R maximus tissues....
Tipo: Text
Palavras-chave: Subcellular distribution; Scallops; Metal; Kinetics; Cadmium; Bivalves.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3581.pdf

Significance of metallothioneins in differential cadmium accumulation kinetics between two marine fish species
Provedor de dados: 5
Autores: Le Croizier, Gael; Lacroix, Camille; Artigaud, Sebastien; Le Floch, Stephane; Raffray, Jean; Penicaud, Virginie; Coquille, Valerie; Autier, Julien; Rouget, Marie-laure; Le Bayon, Nicolas; Lae, Raymond; De Morais, Luis Tito.
Impacted marine environments lead to metal accumulation in edible marine fish, ultimately impairing human health. Nevertheless, metal accumulation is highly variable among marine fish species. In addition to ecological features, differences in bioaccumulation can be attributed to species-related physiological processes, which were investigated in two marine fish present in the Canary Current Large Marine Ecosystem (CCLME), where natural and anthropogenic metal exposure occurs. The European sea bass Dicentrarchus labrax and Senegalese sole Solea senegalensis were exposed for two months to two environmentally realistic dietary cadmium (Cd) doses before a depuration period. Organotropism (i.e., Cd repartition between organs) was studied in two storage...
Tipo: Text
Palavras-chave: Metal; Trace element; Dicentrarchus labrax; Solea senegalensis; Chronic dietary exposure.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00437/54810/56480.pdf

Subcellular distribution of Ag, Cd, Co, Cu, Fe, Mn, Ph, and Zn in the digestive gland of the common cuttlefish Sepia officinalis
Provedor de dados: 5
Autores: Bustamante, Paco; Bertrand, M; Boucaud Camou, E; Miramand, Pierre.
The subcellular fractionation of the digestive gland cells of the common cuttlefish Sepia officinalis was performed to investigate the distribution of metals between organelles and cytosol and the different cytosolic fractions separated by gel-filtration chromatography. Total metal concentrations vary over 3 orders of magnitude, ranging from dwt for Pb to dwt for Zn. With the exception of Cd, Co, and Cu, metals were mostly bound to the organelles. Whereas no specific organelle compartment was found for Mn, Ph, and Zn, Fe was mainly associated with nucleus, brown body, and "boule" fraction (i.e., 52%) and 44% of the total Ag was contained in the lysosomal and mitochondria enriched fraction. The link of metals with hydrosoluble proteins in the cytosolic...
Tipo: Text
Palavras-chave: Sepia officinalis; Chromatography; Metallothionein; Detoxification; Trace element; Metal; Cephalopod.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2532.pdf

A comparison of in situ vs. ex situ filtration methods on the assessment of dissolved and particulate metals at hydrothermal vents
Provedor de dados: 5
Autores: Cotte, Laura; Waeles, Mathieu; Pernet-coudrier, Benoit; Sarradin, Pierre-marie; Cathalot, Cecile; Riso, Ricardo D.
The objective of this study was to assess the impact of the filtration method (in situ vs. ex situ) on the dissolved/particulate partitioning of 12 elements in hydrothermal samples collected from the Lucky Strike vent field (Mid-Atlantic Ridge; MAR). To do so, dissolved ( &lt;0.45 mu m) and particulate Mg, Li, Mn, U, V, As, Ba, Fe, Zn, Cd, Pb and Cu were measured using different techniques (HR-ICP-MS, ICP-AES and CCSA). Using in situ filtration as a baseline, we showed that ex situ filtration (on-board and on shore after freezing) resulted in an underestimation of the dissolved pool, which was counterbalanced by an overestimation of the particulate pool for almost all the elements studied. We also showed that on-board filtration was acceptable for the...
Tipo: Text
Palavras-chave: Metal; Hydrothermal vent; Dissolved; Particulate; Filtration method.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00298/40970/42656.pdf

An in situ intercomparison exercise on passive samplers for monitoring metals, polycyclic aromatic hydrocarbons and pesticides in surface waters
Provedor de dados: 5
Autores: Miege, C.; Mazzella, N.; Schiavone, S.; Dabrin, A.; Berho, C.; Ghestem, J. -p.; Gonzalez, C.; Gonzalez, Jean-louis; Lalere, B.; Lardy-fontan, S.; Lepot, B.; Munaron, Dominique; Tixier, Celine; Togola, A.; Coquery, M.
Tipo: Text
Palavras-chave: Intercomparison exercise; Marine Strategy Framework Directive (MSFD); Metal; Passive sampling; Pesticide; Polar organic chemical integrative sampler (POCIS); Polycyclic aromatic hydrocarbon (PAH); Priority chemical; Surface water; Water Framework Directive (WFD).
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00077/18853/16597.pdf

Interactions between Volatile Reduced Sulfur Compounds and Metals in the Seine Estuary (France)
Provedor de dados: 5
Autores: Cozic, Amandine; Viollier, E; Chiffoleau, Jean-francois; Knoery, Joel; Rozuel, Emmanuelle.
Concentrations of volatile hydrogen sulfide (H2S), carbonyl sulfide (OCS), methane thiol (MeSH), dimethyl sulfide (DMS), and dimethyl disulfide (DMDS) in the Seine estuary (France) were investigated in spring 2005 using samples collected from the first meter beneath the surface. Levels of dissolved metals (Ag, Cd, Cu, Zn, Ni, Co, Pb), suspended particulate matter, and particular organic carbon were also assessed. Maximum concentrations were 0.80 nM for H2S, 0.64 nM for OCS, 3.06 nM for MeSH, 11.06 nM for DMS, and 1.18 nM for DMDS, and different features were observed for the five volatile reduced sulfur compounds (VRSCs). Experiments were conducted to determine silver-VRSC conditional stability constants. Major interactions were observed between H2S and...
Tipo: Text
Palavras-chave: Conditional stability constant; Metal; Volatile reduced sulfur compounds; Seine estuary.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-5019.pdf

Effects of manganese on fat snook Centropomus parallelus (Carangaria: Centropomidae) exposed to different temperatures
Provedor de dados: 83
Autores: Tuzuki,Bárbara Louise L.; Delunardo,Frederico Augusto C.; Ribeiro,Luciana N.; Melo,Caroliny P. de; Gomes,Levy Carvalho; Chippari-Gomes,Adriana Regina.
ABSTRACT This study evaluates the effects of exposure to manganese (Mn2+) for 96 hours at two different temperatures (24 and 27°C) on juveniles of Centropomus parallelus through the activities of glutathione S-transferase (GST) and catalase (CAT), micronuclei test (MN) and comet assay. The GST activity did not show any significant difference between the groups exposed to Mn2+ and the respective control groups; in contrast, a major increase in the CAT activity was observed at 27°C in the group exposed to Mn2+ compared to the control group. The genotoxic analyses showed that in all animals exposed to Mn2+, the number of red cells with micronuclei increased significantly compared to the respective control groups. There was also a significant increase in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomarkers; DNA damage; Enzymes; Genotoxicity; Metal; Micronuclei.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000400202

Mycorrhizal effectiveness and manganese toxicity in soybean as affected by soil type and endophyte
Provedor de dados: 63
Autores: Nogueira,Marco Antonio; Cardoso,Elke Jurandy Bran Nogueira.
Mycorrhizal plants may present Mn toxicity alleviation and this depends on the plant-endophyte-environment interaction. The effectiveness of three arbuscular mycorrhizal fungi (AMF) (Glomus macrocarpum, G. etunicatum, G. intraradices) and a control without AMF in two soils: Typic Rhodudalf with high Mn availability and a Typic Quartzipsamment, with low Mn availability, was evaluated in a time-course experiment at 3, 6, 9 and 12 weeks after soybean (Glycine max L.) seedling emergence. The objective was to select the most effective AMF species to enhance plant growth and to assess its effects upon Mn uptake by plants and Mn availability in the soil. For the sandy soil, AMF inoculation resulted in increased plant biomass, especially with G. intraradices and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mn; Availability; Metal; Mycorrhiza; Toxicity; Uptake.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200018

Extraction, partial characterization and susceptibility to Hg2+ of acid phosphatase from the microalgae Pseudokirchneriella subcapitata
Provedor de dados: 63
Autores: Jonsson,Claudio Martín; Aoyama,Hiroshi.
Pseudokirchneriella subcapitata is a unicellular green algae widely distributed in freshwater and soils. Due to its cosmopolitan characteristic, its use is recommended by national and international protocols in ecotoxicity studies. The alteration of phosphatase activities by agriculture pollutants like heavy metals has been extensively used as a biomarker in risk assessment and biomonitoring. In this study, we compared the extraction of acid phosphatase from P. subcapitata by different procedures and we studied the stability, substrates specificity, kinetics and the effect of Hg2+ in the crude extract. The freezing and thawing technique associated with probe sonication was the most suitable method of extraction. The enzyme was stable when frozen at -20ºC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Selenastrum capricornutum; Algae; Enzyme; Metal; Toxicity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500008

Recovery of copper (II) absorbed in biomass of Cladosporium cladosporioides
Provedor de dados: 63
Autores: Carmo,Juliana Ribeiro do; Pimenta,Carlos José; Silva,Júlia Ferreira da; Souza,Sara Maria Chaulfoun de.
The biosorption process, characterized by the use of biomass for removing metals from aqueous solutions, is an attractive technology using inactive and dead biomasses to remove heavy metals from aqueous solutions in the absence of metabolic activity necessary for intracellular accumulation. The desorption process, which concentrates the metal previously absorbed for possible reuse, is also important. The desorption of copper (Cu) (II) associated with the biomass of Cladosporium cladosporioides (Fres) de Vries was evaluated following the biosorption process (adsorption). Specifically, four eluents were used (all at a concentration 0.1 mol L-1), sulfuric acid, hydrochloric acid, ethylenediaminetetraacetate disodium and calcium chloride, as well as the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosorption; Metal; Desorption.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300002

Avaliação da distribuição de cobre associado a compostos de diferentes massas moleculares na polpa de açaí
Provedor de dados: 36
Autores: Trindade,Samantha Leite da; Nunes,Patrícia de Oliveira; Fernandes,Kelly das Graças.
Neste estudo, cromatografia de exclusão por tamanho (SEC) com detecção por UV e detecção off-line por espectrometria de absorção atômica em forno de grafite (GF AAS) foi usada para investigar a associação de cobre a espécies de alta massa molecular (HMW) e baixa massa molecular (LMW) presentes na polpa de açaí (Euterpe oleracea Mart.). A concentração total de cobre obtida nos digeridos da polpa de açaí foi 10,5 µg g-1. Cobre foi encontrado associado às frações de HMW e LMW, correspondentes às massas moleculares de 28,7, 2,6 e 0,43 kDa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metal; SEC; GF AAS; Proteínas; Euterpe oleracea Mart.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000200016

Atributos do solo relacionados à adsorção de cádmio e cobre em solos tropicais - DOI: 10.4025/actasciagron.v27i4.1348
Provedor de dados: 1
Autores: Alleoni, Luis Reynaldo Ferraciciú; esalq-usp; Iglesias, Cindy Silva Moreira; DE FERRAN AMBIENTAL; Mello, Simone de Castro; ESALQ - USP; Camargo, Otávio Antonio de; IAC; Casagrande, José Carlos; UFSCar; Lavorenti, Norberto Antonio; UFSCar.
A adsorção de metais pesados no solo, tais como o cádmio e o cobre, é controlada por reações químicas e por processos físicos e biológicos. A retenção de metais pesados no solo pode diminuir a biodisponibilidade desses elementos no sistema solo-solução. Avaliou-se a adsorção de cádmio e de cobre em amostras de horizontes superficiais e subsuperficiais de oito solos, sendo cinco Latossolos, dois Nitossolos e um Argissolo. Correlacionou-se a adsorção máxima estimada pela equação linearizada de Langmuir com vários atributos dos solos. No horizonte A, a adsorção máxima de Cd foi correlacionada positivamente com a CTC total, com a superfície específica e com os teores de teores de argila, de silte, de óxidos de ferro bem cristalizados e de alumínio total,...
Palavras-chave: 5.01.01.03-0    Química do Solo retenção; Metal; Adsorção máxima; Lngmuiar 5.01.01.03-0    Química do Solo.
Ano: 2005
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1348

Cadmium toxicity on seed germination and seedling growth of wheat Triticum aestivum
Provedor de dados: 3
Autores: Guilherme, Maria de Fátima Souza; Oliveira, Habyhabanne Maia; Silva, Edevaldo da.
Cadmium toxicity in seed germination and seedling growth of wheat (Triticum aestivum, var. IAC-370) is assessed. The ecotoxicological effects of six experimental concentrations of cadmium (0.03; 0.06; 0.12; 0.6; 1.2; 2.4; 4.8 mM), and control were evaluated. All assays were performed in quadruplicates with 25 seeds per replication in Petri dishes. Responses for toxic effect comprised the variables germination percentage, index of velocity of germination (IVG), length of aerial section and root of the seedlings, green and dry mass of the seedlings. Results showed that T. aestivum seeds exposed to cadmium decreased their normal germination percentage as from 0.03 mM concentration, with a 31% reduction of germination percentage and a 20% decrease in IVG....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 1.06.04.07-3; 2.03.03.01-7 ecotoxicology; Metal; Contamination. 1.06.00.00-0; 2.03.00.00-0.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/28148

Taxonomic and non-taxonomic responses of benthic macroinvertebrates to metal toxicity in tropical reservoirs. The case of Cantareira Complex, São Paulo, Brazil
Provedor de dados: 42
Autores: BEGHELLI,FREDERICO G.S.; CETRA,MAURÍCIO; MARCHESE,MERCEDES; LÓPEZ-DOVÁL,JÚLIO CÉSAR; ROSA,ANDRÉ H.; POMPÊO,MARCELO L. M.; MOSCHINI-CARLOS,VIVIANE.
Abstract  Benthic macroinvertebrates are organisms that are recognized as water quality bio-indicators. A wide variety of indices and metrics have been shown to respond to a variety of anthropogenic impacts, usually under a general condition of environmental impairment. The absence of a clear distinction in the relations between specific pollutants and biotic variables is very common and can lead to biased interpretation of biomonitoring. The aims of this research were to test taxonomic and non-taxonomic responses to specific environmental conditions instead to general conditions. For this purpose, we estimated the theoretical toxicity by comparing toxicity values published by EPA with metal concentrations in water and sediments. Then we tested the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bio-indicator; Biomonitoring; Chironomid; Oligochaetes; Toxicity; Metal.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000300701

Analysis of major metallic elements in Chilean wines by atomic absorption spectroscopy
Provedor de dados: 118
Autores: Laurie,V. Felipe; Villagra,Evelyn; Tapia,Jaime; Sarkis,Jorge E. S; Hortellani,Marcos A.
A set of 75 wine samples from seven of the major wine producing regions in Chile were analyzed with flame atomic absorption spectroscopy (AAS) to determine their content of major metallic elements (K, Mg, Ca, Na, Fe and Zn). The results obtained were further analyzed with principal component analysis (PCA) in an attempt to loosely discriminate these wines according to grape type and geographical origin. The metal concentrations measured were within normal ranges, according to previously published data from other wine producing countries. Multivariate statistics allowed the possibility to reasonably discriminate between red and white wines, and to show a distinctive pattern of Na concentration, with higher total contents for the wines produced in the...
Tipo: Journal article
Palavras-chave: Wine; Metal; AAS; Multivariate analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200008

Presença de Cádmio em mostos e vinhos
Provedor de dados: 65
Autores: D'Agostini,Denise; Daudt,Carlos Eugenio.
Cádmio foi determinado em mostos e vinhos de duas cultivares de uvas vim/eras (Cabernet Sauvignon e Saint Emilion). Amostras/oram retiradas periodicamente durante a fermentação alcoólica e também do bagaço da cv. Cabernet Sauvignon, das borras e das sementes resultantes das trasfegas e do produto final. As fermentações de cada cultivar sofreram adição de quantidades conhecidas de cádmio (5mg/l e 5mg/l) afim de verificar o seu comportamento em diferentes concentrações. As determinações de cádmio foram realizadas através da espectrometria de absorção atómica com utilização de forno de grafite. Os valores máximos encontrados, expressos em mg/1 foram, respectivamente: vinhos controle, 0,88: vinhos adicionados de baixos teores de cádmio (5mg/l), 4,17: e, vinhos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metal; Suco de uva; Fermentação.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781997000100025