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| Registros recuperados: 37 | |
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| 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 ( <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 |
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| MIELE, A.; RIZZON, L. A.; QUEIROZ, S. C. do N. de. |
| Summary There is concern about the health problems caused by pesticides in humans, which has led some grape producers to adopt organic procedures in their vineyards, and a certain amount of these grapes are directed to winemaking. Despite the approval awarded to this organic grape production by the certified organizations, there has been a demand to carry out a survey to determine the physicochemical composition of the wine derived from these products. Some of these wines were made from a single grape variety and others from more than one. For this survey, the samples consisted of five bottles of each type of wine, acquired from wineries and supermarkets in the Serra Gaúcha region, RS, Brazil. The analyses were carried out by physicochemical methods:... |
| Tipo: Separatas |
Palavras-chave: Vitis Spp; Vinhedos.; Metal; Metal pesado; Mineral; Resíduo; Viticultura; Agricultura Orgânica.; Minerals; Heavy metals; Pesticide residues. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1047106 |
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| 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 |
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| 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 |
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| 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,... |
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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 |
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| 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 |
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| TIZIOTO, P. C.; GROMBONI, C. F.; NOGUEIRA, A. R. de A.; SOUZA, M. M. de; MUDADU, M. de A.; THOLON, P.; ROSA, A. do N.; TULLIO, R. R.; MEDEIROS, S. R. de; NASSU, R. T.; REGITANO, L. C. de A.. |
| Calcium (Ca) and potassium (K) are essential nutrients in animal nutrition. Furthermore, the Ca content can influence meat tenderness because it is needed by the proteolytic system of calpains and calpastatins, major factors in postmortem tenderization of skeletal muscles. K content, which is needed for muscle contraction, can also affect meat tenderness. This study showed that K positively affects the Warner-Bratzler shear force (WBSF), measured at 14days of meat aging, which means that higher levels of K are related to lower meat tenderness. Additionally, a significant effect (P?0.015) of a SNP in the calcium-activated neutral protease 1 (CAPN1) gene on Ca content was observed. Metal content in beef can affect not only nutritional values but also meat... |
| Tipo: Artigo de periódico |
Palavras-chave: Ionone; Shear force; Metal; Calpain; Calpastatin. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/983784 |
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| SANTOS, S. de O.; SILVA, C. A. da. |
| A ingestão de alimentos ricos em nutrientes é um passo importante para manter um estilo de vida saudável. Os pescados possuem características nutritivas, além de serem apreciados por grande parte da população. São importantes fontes de vitaminas, minerais, proteína de alta qualidade, ômega-3 e ácidos graxos poli-insaturados. O objetivo da pesquisa foi avaliar a concentração de ferro e zinco em diferentes espécies de peixes utilizando a técnica da espectrometria de absorção atômica por chama. A quantidade de músculo liofilizado utilizado nas análises foi de 0,40 g pesado diretamente nos tubos de digestão onde foi adicionado 10,0 mL de ácido nítrico 7 M e 2,0 mL de peróxido de hidrogênio. A digestão das amostras foi feita utilizando um micro-ondas Anton Paar... |
| Tipo: Parte de livro |
Palavras-chave: Peixes; Espectrofometria.; Animal aquático; Metal; Ferro; Mineral; Zinco.. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1027180 |
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| SOUZA, E. C. de; LAMEIRA, O. A.; FAIAL, K. do C. F.; MÜLLER, R. C. S.; BRASIL, D. do S. B.. |
| As plantas medicinais são empregadas no tratamento e na cura de enfermidades de forma tão antiga quanta a espécie humana. Devido às observações populares sobre o uso e a eficácia de plantas medicinais, se passou a conhecer seus efeitos benéficos sem ao menos saber suas propriedades, constituições e composição química. Na Amazônia muitas espécies vegetais são usadas para combater diversos males, como é o caso do urucuzeiro (Bixa orellanaL.), espécie natural desta região do Brasil, onde é empregado como chás de suas folhas para o tratamento de hepatites, distúrbios pulmonares, afecções estomacais e diversos outros males. Neste trabalho foram determinados, via ICP OES, os teores de Al, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni e Zn em chás de folhas de urucuzeiro... |
| Tipo: Artigo de periódico |
Palavras-chave: Urucum; Bixa Orellana; Metal; Amazonia. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1123970 |
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| MUNIZ,Luiza Portugal; SANTOS,Lisia Maria Gobbo dos; COUTO,Katia Laine Magalhães do; JACOB,Silvana do Couto. |
| Abstract There is a growing concern about health and food safety when it comes to processed food. In the present study, it has been hypothesized that tomato sauces contain high amounts of metals possibly leached from packaging. Concentrations of As, Cd, Pb, Cr, Ni, Sn and Sb were determined by ICP-MS in tomato sauces stored in metallic, plastic, cellulosic and glass packaging. Packaging composition was determined by XRF. This study has also determined Cr and Sn content, by GF AAS, in simulant solutions prepared to be in contact with the four types of packaging. The results showed that there was no significant difference between the concentrations of metals in products stored in different types of packaging (p>0.05), except for Sn and Ni. Canned... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metal; Packaging; ICP-MS; XRF; GF AAS. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000300383 |
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| 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 |
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| 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 (> 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 |
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| 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 |
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| Registros recuperados: 37 | |
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