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| Registros recuperados: 80 | |
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| 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... |
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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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| 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... |
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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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| 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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| Delcroix, Valérie. |
| Le cadmium, sous produit du zinc est utilisé en industrie. La quasi totalité du cadmium utilisé a été disséminée dans l'environnement. Le cadmium provoque chez l'homme des intoxications par inhalation et par ingestion par l'intermédiaire d'aliments contaminés. Les organismes marins comme l'huître concentrent le cadmium et le stockent sous des formes biodisponibles par les mammifères qui les consomment. Face à ce problème important nous avons mené une enquète avec l'aide de l' IFREMER et de la DDASS sur les effets possibles de l'accumulation de cadmium par les consommateurs d'huitres. Une étude de décontamination a été entreprise sur ces huîtres, une fois placées en eau exempte de pollution |
| Tipo: Text |
Palavras-chave: Cadmium; Huître Gigas; Estuaire Gironde; Epdémiologie cadmium; Décontamination. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00442/55394/56914.pdf |
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| Registros recuperados: 80 | |
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