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Registros recuperados: 87
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Absorção e distribuição de cádmio e micronutrientes em cultivares de feijoeiro expostas a doses de cádmio. Repositório Alice
NASCIMENTO, C. W. A. do; PEREIRA, J. B. M..
Visando avaliar os efeitos de doses crescentes de cádmio em solução nutritiva sobre a absorção e a translocação de Cd, Zn, Fe, Mn e Cu por plantas de feijoeiro (Phaseolus vulgaris L.), foi montado um ensaio em casa de vegetação utilizando-se as cultivares Ouro Negro e Carioca. As doses de Cd utilizadas foram: 0,0; 0,025; 0,05; 0,10 e 0,50 ?g/mL, aplicadas em vasos de 4,8 L contendo solução nutritiva de Clark com metade da força iônica original a pH 6,0. Verificou-se aumento na absorção de Cd com o aumento das doses do elemento em solução. As raízes acumularam maiores quantidades do metal que a parte aérea. As doses de Cd diminuíram os conteúdos de Zn e de Mn nas raízes de ambas as cultivares, sem afetar, na mesma proporção, a quantidade desses cátions na...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Ouro Negro; Carioca; Feijão; Phaseolus vulgaris L; Variedade; Absorção de nutrientes; Metal pesado; Toxidez; Cádmio; Beans; Cultivars; Plant micronutrients; Cadmium; Metal tolerance; Frijoles; Cultivares; Micronutrientes de la planta; Tolerancia al metal.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/492617
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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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Accumulation du cadmium par Mytilus edulis en présence de bactéries marines sensibles ou résistantes à ce metal ArchiMer
Flatau, Gilles N.; Gauthier, Michel J.
The cadmium accumulation by the soft parts of the mussels increased in the presence of the sensitive strain, and was lower in the presence of the resistant strain, when only ionic metal was given to the mussels. The metal brought by previously contamined and killed bacteria was more accumulated by the different organs than when it was provided in the ionic form, and was more accumulated by viscera and gills when it was bound to the resistant bacteria.
Tipo: Text Palavras-chave: Cadmium; Accumulation; Moule; Bactéries marines; Résistance.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00306/41754/40965.pdf
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Aclimatación de vitroplantas y tolerancia a cadmio en caña de azúcar. Colegio de Postgraduados
Rivera Olivares, Laura Yolanda.
En un primer experimento se evaluó la aclimatación de vitroplantas de caña de azúcar de las variedades MEX69290 y CP722086 en tres sustratos; 1) TBZ: tezontle + bagazo de caña, 2) TCA: Tezontle + cascarilla de arroz y 3) TCZ: tezontle + cachaza; las mezclas en éstos en una proporción 40/60 (v/v). Las variables evaluadas fueron porcentaje de sobrevivencia, altura de plántula, diámetro de tallo, biomasa seca, azúcares solubles totales y concentración nutrimental. Las últimas tres variables fueron evaluadas en los vástagos y raíces. Se utilizó un diseño experimental completamente al azar con cincuenta repeticiones por tratamiento. A los 30 d, la menor sobrevivencia de la variedad MEX69290 fue de 84%;, mientras que la de CP722086 de 64%; en ambos casos en el...
Palavras-chave: Aclimatación; Cadmio; Saccharum officinarum; Vitroplantas; Acclimation; Cadmium; Plantlets; Edafología; Maestría.
Ano: 2011 URL: http://hdl.handle.net/10521/562
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Aclimatación de vitroplantas y tolerancia a cadmio en caña de azúcar. Colegio de Postgraduados
Rivera Olivares, Laura Yolanda.
En un primer experimento se evaluó la aclimatación de vitroplantas de caña de azúcar de las variedades MEX69290 y CP722086 en tres sustratos; 1) TBZ: tezontle + bagazo de caña, 2) TCA: Tezontle + cascarilla de arroz y 3) TCZ: tezontle + cachaza; las mezclas en éstos en una proporción 40/60 (v/v). Las variables evaluadas fueron porcentaje de sobrevivencia, altura de plántula, diámetro de tallo, biomasa seca, azúcares solubles totales y concentración nutrimental. Las últimas tres variables fueron evaluadas en los vástagos y raíces. Se utilizó un diseño experimental completamente al azar con cincuenta repeticiones por tratamiento. A los 30 d, la menor sobrevivencia de la variedad MEX69290 fue de 84%;, mientras que la de CP722086 de 64%; en ambos casos en el...
Palavras-chave: Aclimatación; Cadmio; Saccharum officinarum; Vitroplantas; Acclimation; Cadmium; Plantlets; Edafología; Maestría.
Ano: 2011 URL: http://hdl.handle.net/10521/562
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Acute and chronic effects of cadmium on blood homeostasis of an estuarine crab, Chasmagnathus granulata, and the modifying effect of salinity BJMBR
Rodríguez,E.M.; Bigi,R.; Medesani,D.A.; Stella,V.S.; Greco,L.S.L.; Moreno,P.A.R.; Monserrat,J.M.; Pellerano,G.N.; Ansaldo,M..
Whole body oxygen consumption and some hemolymph parameters such as pH, partial pressure of gases, level of ions and lactate were measured in the estuarine crab Chasmagnathus granulata after both acute (96 h) and chronic (2 weeks) exposure to cadmium at concentrations ranging from 0.4 to 6.3 mg/l. In all instances, the crabs developed hemolymph acidosis, but no respiratory (increased PCO2) or lactate increases were evident. Hemolymph levels of sodium and calcium were always increased by cadmium exposure. The chronic toxicity of cadmium was enhanced at 12‰ salinity, even causing a significantly higher mortality in comparison with the higher salinity (30‰) used. A general metabolic arrest took place at 12‰ salinity in the crabs chronically exposed to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cadmium; Crabs; Blood homeostasis; Salinity.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000400011
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Adaptive and cross-protective responses against cadmium and zinc toxicity in cadmium-resistant bacterium isolated from a zinc mine BJM
Prapagdee,Benjaphorn; Watcharamusik,Anchulee.
Cadmium (Cd) is a major environmental hazard, which usually is detected in its ionic form of Cd2+. It also causes adverse toxic effects on human health and other living organisms. Cd-resistant bacteria were isolated from Cd-contaminated soils. One isolate, TAK1, was highly resistance level to Cd toxicity. TAK1 was isolated from soil contaminated with a high Cd concentration (204.1 mg.kg-1). The result of 16S rDNA sequence analysis found that the TAK1 showed the similarity to Ralstonia sp. Physiological adaptive and cross-protective responses to Cd and Zn killing were investigated in Ralstonia sp.TAK1. Exposure to a low concentration of Cd induced adaptive resistance to higher concentrations of Cd. In addition, pretreatment of Ralstonia sp.TAK1 with an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterial responses; Cadmium; Zinc; Metal Resistance; Ralstonia sp.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000400014
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Application of modified simplex on the development of a preconcentration system for cadmium determination in sediments, food and cigarettes Anais da ABC (AABC)
SANTOS,QUEILA O.; MORENO,ISLANIA; SANTOS,LEANDRO DOS; SANTOS,ALDENOR G.; SOUZA,VALDINEI S.; BEZERRA,MARCOS A..
A modified simplex algorithm was used to optimize a system of preconcentration for cadmium determination in samples of sediments, cigarettes and food using flame atomic absorption spectrometry. The preconcentration system is based on the sorption of cadmium in a minicolumn packed with Amberlite XAD-2 resin functionalized with 3,4-dihydroxybenzoic acid (DHB). The optimized variables were pH and sampling flow rate and the optimum conditions found for these variables were, respectively 8.7 and 8.8 mL min-1. The developed system showed a preconcentration factor of 15.3, detection limit of 0.49 µg L-1, quantification limit of 1.65 µg L-1 and precision expressed as relative standard deviation (% RSD, n=10) of 5.9. The accuracy of the method was checked by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Simplex optimization; Preconcentration; Cadmium; Sediments; Cigarettes; Food.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300791
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Arsenic, cadmium and lead concentrations in Yerba mate commercialized in Southern Brazil by inductively coupled plasma mass spectrometry Ciência Rural
Santos,Lisia Maria Gobbo dos; Vicentini Neto,Santos Alves; Iozzi,Giovanna; Jacob,Silvana do Couto.
ABSTRACT: “Mate” or “Yerba Mate” (Ilex paraguariensis) is a native South American plant, commonly consumed in Argentina, Paraguay, Uruguay and southern Brazil. Recent research has detected the presence of many vitamins and metals in this plant. Theses metals are also part of yerba mate’s mineral composition, due to soil and water contamination by pesticides and fertilizers, coal and oil combustion, vehicle emissions, mining, smelting, refining and the incineration of urban and industrial waste. Regardless of their origin, some inorganic elements, such as arsenic, cadmium and lead, are considered toxic, since they accumulate in all plant tissues and are, thus, introduced into the food chain. In this context, the aim of the present study was to determine and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arsenic; Cadmium; Lead; ICP-MS; Yerba mate.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001200751
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Assessment of heavy metal residues in Brazilian poultry and swine tissue Arq. Bras. Med. Vet. Zootec.
Alkmim Filho,J. F.; Germano,A.; Dibai,W.L.S.; Vargas,E.A.; Melo,M.M..
The aim of this study was to investigate the presence of arsenic, lead and cadmium residues in samples of liver, kidney and muscle of poultry and swine during the years from 2002 to 2008. A total of 1978 samples were analyzed: 1031 of poultry and 947 of swine from Brazilian slaughterhouses. The samples were analyzed at the National Agricultural Laboratory using the atomic absorption spectrometry technique. In poultry, the arsenic residues were detected in 53.6% of liver samples, although no results have exceeded the MRL. In kidneys, 39.7% of the samples showed measurable residues and there was no violation of the limits. Regarding lead, there were 5 contaminated liver samples and 24 contaminated kidney samples (1.5 and 3.6% respectively). In muscle tissue...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Trace elements; Arsenic; Cadmium; Lead.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000200022
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Associative diazotrophic bacteria in grass roots and soils from heavy metal contaminated sites Anais da ABC (AABC)
Moreira,Fátima M.S.; Lange,Anderson; Klauberg-Filho,Osmar; Siqueira,José O.; Nóbrega,Rafaela S.A.; Lima,Adriana S..
This work aimed to evaluate density of associative diazotrophic bacteria populations in soil and grass root samples from heavy metal contaminated sites, and to characterize isolates from these populations, both, phenotypically (Zinc, Cadmium and NaCl tolerance in vitro, and protein profiles) and genotypically (16S rDNA sequencing), as compared to type strains of known diazotrophic species. Densities were evaluated by using NFb, Fam and JNFb media, commonly used for enrichment cultures of diazotrophic bacteria. Bacterial densities found in soil and grass root samples from contaminated sites were similar to those reported for agricultural soils. Azospirillum spp. isolates from contaminated sites and type strains from non-contaminated sites varied...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Azospirillum; Zinc; Cadmium; Soil contaminants; Nitrogen-fixing bacteria.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000400014
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Bioemulsifier production by Microbacterium sp. strains isolated from mangrove and their application to remove cadmiun and zinc from hazardous industrial residue BJM
Aniszewski,Erick; Peixoto,Raquel Silva; Mota,Fábio Faria; Leite,Selma Gomes Ferreira; Rosado,Alexandre Soares.
The contamination of ecosystems with heavy metals is an important issue in current world and remediation technologies should be in according to environmental sustainability concept. Bioemulsifier are promising agents to be used in metal removal and could be effective to many applications in environmental industries. The aims of this work was screening the potential production of bioemulsifier by microorganisms isolated from an oil contaminated mangrove, and evaluate cadmium and zinc removal potential of those strains from a hazardous industrial residue. From that, bioemulsifier-producing bacteria were isolated from urban mangrove sediments. Four isolates were identified as Microbacterium sp by 16S rRNA analysis and were able to reduce up to 53.3% of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosemulsifier; Heavy metals; Zinc; Cadmium; Microbacterium; Bioremediation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100033
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Biological and ecological factors related to trace element levels in harbour porpoises (Phocoena phocoena) from European waters ArchiMer
Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence.
Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises...
Tipo: Text Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf
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Cadmium and mercury in Seine Estuary flounders and mussels: the results of two decades of monitoring ArchiMer
Nakhle, K; Cossa, Daniel; Claisse, Didier; Beliaeff, Benoit; Simon, S.
The flounder (Platichthys flesus) is a flatfish that inhabits marine coastal environments, especially estuaries. It is an alternative quantitative biological indicator to the common marine mussel (Mytilus spp.), which is currently used as a sentinel species to monitor chemical contamination in numerous monitoring programmes. Findings from two decades of monitoring cadmium (Cd) and mercury (Hg) using both sentinel species in the Seine Estuary (France) are reported. For comparison, time-series of water concentrations for the same two metals at the mouth of the River Seine are given. Cd concentrations in the liver of the fish and in the soft tissue of mussels show similar temporal trends, consistent with the major temporal variations of Cd concentrations...
Tipo: Text Palavras-chave: Platichthys flesus; Mussel watch; Monitoring; Mercury; Flounder; Estuary; Cadmium.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3028.pdf
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Cadmium determination in Lentinus edodes mushroom species Ciênc. Tecnol. Aliment.
Maihara,Vera Akiko; Moura,Patricia Landim da Costa; Catharino,Marília Gabriela Miranda; Moreira,Edson Gonçalves; Castro,Lilian Pavanelli; Figueira,Rubens Cesar Lopes.
Many studies have drawn attention to the occurrence and concentration of toxic elements found in the fruiting body of mushrooms. Some edible mushroom species are known to accumulate high levels of inorganic contaminants, mainly cadmium, mercury, and lead. There are about 2,000 known edible mushroom species, but only 25 of them are cultivated and used as food. In Brazil, the most marketed and consumed mushroom species are Agaricus bisporus, known as Paris champignon, Lentinus edodes, or Shitake and Pleurotus sp, also called Shimeji or Hiratake. In this study, the concentration of cadmium was determined in Lentinus edodes mushrooms from different cities in São Paulo state and some samples imported from Japan and China. The analyses were performed by graphite...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cadmium; Mushrooms; Lentinus edodes; Atomic absorption spectrometry.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000300019
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Cadmium pathways in an exploited intertidal ecosystem with chronic cadmium inputs (Marennes-Oleron, Atlantic coast, France) ArchiMer
Pigeot, J; Miramand, P; Guyot, T; Sauriau, Pierre-guy; Fichet, D; Le Moine, Olivier; Huet, V.
The Marennes-Oleron Bay is subject to chronic pollution by cadmium (Cd) from the Gironde watershed. An ecosystem approach was used to study the fate of cadmium in the different biological compartments. The median Cd concentration was 0.4 mu g g(-1) dry weight for the 63 benthic species measured. When combined with the respective biomasses for the different species studied, we estimated that 7 kg of Cd is partitioned into the soft tissues of the benthic species in the bay. The majority of this cadmium was distributed between primary producers, mainly microphytobenthos (40 %), and suspension-feeders, mainly oysters (40 %). All other benthic species measured were associated with negligible masses of Cd. Two trophic levels contained 98 % of the Cd: 3 kg was...
Tipo: Text Palavras-chave: Marennes Oleron Bay; Trophic food web; Bioaccumulation; Cadmium; Macrofauna; Microphytobenthos; Macrophytes.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3615.pdf
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Cadmium toxicity affects chlorophyll a and b content, antioxidant enzyme activities and mineral nutrient accumulation in strawberry Biol. Res.
Muradoglu,Ferhad; Gundogdu,Muttalip; Ercisli,Sezai; Encu,Tarik; Balta,Fikri; Jaafar,Hawa ZE; Zia-Ul-Haq,Muhammad.
BACKGROUND: Cadmium (Cd) is well known as one of the most toxic metals affecting the environment and can severely restrict plant growth and development. In this study, Cd toxicities were studied in strawberry cv. Camarosa using pot experiment. Chlorophyll and malondialdehyde (MDA) contents, catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) activities and mineral nutrient concentrations were investigated in both roots and leaves of strawberry plant after exposure Cd. RESULTS: Cd content in both roots and leaves was increased with the application of increasing concentrations of Cd. We found higher Cd concentration in roots rather than in leaves. Chlorophyll a and b was decreased in leaves but MDA significantly increased under increased...
Tipo: Journal article Palavras-chave: Antioxidant enzymes; Cadmium; Chlorophyll; Heavy metal stress; Strawberry.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100011
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Cadmium toxicity in plants Braz. J. Plant Physiol.
Benavides,María P.; Gallego,Susana M.; Tomaro,María L..
Heavy metals are important environmental pollutants and their toxicity is a problem of increasing significance for ecological, evolutionary, nutritional, and environmental reasons. Plants posses homeostatic cellular mechanisms to regulate the concentration of metal ions inside the cell to minimize the potential damage that could result from the exposure to nonessential metal ions. This paper summarizes present knowledge in the field of higher plant responses to cadmium, an important environmental pollutant. Knowledge concerning metal toxicity, including mechanisms of cadmium homeostasis, uptake, transport and accumulation are evaluated. The role of the cell wall, the plasma membrane and the mycorrhizas, as the main barriers against cadmium entrance to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cadmium; Heavy metals; Metal toxicity; Phytochelatins; Oxidative stress.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100003
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Cadmium-induced apoptosis of Siberian tiger fibroblasts via disrupted intracellular homeostasis Biol. Res.
Wang,Hui; Liu,Zheng; Zhang,Wenxiu; Yuan,Ziao; Yuan,Hongyi; Liu,Xueting; Yang,Chunwen; Guan,Weijun.
BACKGROUND: Heavy metals can cause great harm to Siberian tigers in the natural environment. Cadmium (Cd2+) is an environmental contaminant that affects multiple cellular processes, including cell proliferation, differentiation, and survival. It has been shown to induce apoptosis in a variety of cell types and tissues. RESULTS: We investigated the apoptotic effects of Cd2+ on Siberian tiger fibroblasts in vitro. Our research revealed the typical signs of apoptosis after Cd²+ exposure. Apoptosis was dose- (0-4.8 μΜ) and duration-dependent (12-48 h), and proliferation was strongly inhibited. Cd²+ increased the activity of caspase-3, -8, and -9 and disrupted calcium homeostasis by causing oxidative stress and mitochondrial dysfunction. It...
Tipo: Journal article Palavras-chave: Siberian tiger; Cadmium; Apoptosis; Fibroblast; Calcium.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602016000100042
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Comparative study of potential transfer of natural and anthropogenic cadmium to plankton communities in the North-West African upwelling ArchiMer
Auger, Pierre-amael; Machu, Eric; Gorgues, Thomas; Grima, Nicolas; Waeles, Mathieu.
A Lagrangian approach based on a physical-biogeochemical modeling was used to compare the potential transfer of cadmium (Cd) from natural and anthropogenic sources to plankton communities (Cd-uptake) in the NorthWest African upwelling. In this region, coastal upwelling was estimated to be the main natural source of Cd while the most significant anthropogenic source for marine ecosystem is provided by phosphate industry. In our model experiment, Cd-uptake (natural or anthropogenic) in the North-West African upwelling is the result of an interplay between the Cd dispersion (by advection processes) and the simulated biological productivity. In the Moroccan waters, advection processes limit the residence time of water masses resulting in a low natural...
Tipo: Text Palavras-chave: Cadmium; North-West African upwelling; Phosphate industry; Dispersion; Bioaccumulation; Plankton ecosystem.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00252/36310/35200.pdf
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