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| Registros recuperados: 204 | |
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| LOPES,Marcelly Castello Branco; CARVALHO,Gabriel Oliveira de; BERNARDO,Robson Roney; MACEDO,Joana; LINO,Adan Santos; RAMALHO,Emiliano Esterci; KASPER,Daniele; MEIRE,Rodrigo Ornellas; TORRES,João Paulo Machado; MALM,Olaf. |
| ABSTRACT This is the first study to investigate mercury (Hg) contamination in felid species in the Brazilian Amazon. We collected 26 fur samples from wild felids of four species (Puma concolor, Panthera onca, Leopardus pardalis and Leopardus wiedii) occurring in the Mamirauá and Amanã sustainable development reserves, in the state of Amazonas. Samples were from museum specimens, except for five P. onca samples collected from free-living individuals. Total Hg concentrations ranged from 0.12 to 48.1 µg g-1. Concentrations of Hg did not differ significantly between museum specimens and live individuals of P. onca, but varied significantly among species, with significantly higher concentrations for P. onca and L. pardalis, which could be related to factors... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Mammals; Bioaccumulation; Fur; Heavy metals. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000200142 |
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| RENDÓN-VALENCIA,BEATRIZ; ZAPATA,LINA M; C. BOCK,BRIAN; PÁEZ,VIVIAN P.; PALACIO,JAIME A.. |
| We quantified total mercury concentrations in eggshells, egg yolks, and embryos from 16 nests of the Colombian Slider (Trachemys callirostris). Nests were collected in different stages of development, but estimated time of incubation in natural substrates was not correlated with mercury levels in the eggs, suggesting that mercury was not absorbed from the substrate, but more likely passed on to the embryos during folliculogenesis by the reproductive females who had bioaccumulated the mercury from environmental sources. Mean mercury concentrations were higher in embryos than in eggshells or egg yolks, indicating that embryos also bioaccumulate mercury present in other egg tissues. Intra-clutch variation in egg yolk mercury concentrations was relatively... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioaccumulation; Colombian slider; Heavy metals; Mercury; Yolk. |
| Ano: 2014 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2014000300016 |
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| Mazzoni,Aline Correa; Lanzer,Rosane; Bordin,Juçara; Schäfer,Alois; Wasum,Ronaldo. |
| Caxias do Sul hosts the second largest metal-mechanic pole in Brazil, which increases the risk of atmospheric contamination. With the aim of identifying species that might be useful as indicators of atmospheric deposition of metals, 15 species of mosses from an urban and a rural setting were analyzed and compared with specimens deposited at the Herbarium of the Universidade de Caxias do Sul. Metal concentrations (Zn, Ni, Cd, Cr, Cu and Pb) were determined using Atomic Absorption Spectrometry (AAS). The Mann-Whitney test indicated concentrations of Zn, Cu, Pb and Cr that were significantly different between the urban and rural areas. Additionally, Concentrations of Zn, Cd, Cu and Pb were significantly higher in recently collected samples. The species... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atmospheric pollution; Bioindicators; Bryophyta; Heavy metals; Rio Grande do Sul. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000300005 |
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| Cassanego,Mara Betânia Brizola; Goldoni,Angélica; Heldt,Fágner Henrique; Osório,Daniela Montanari Migliavacca; Windisch,Paulo Günter; Droste,Annette. |
| Regnellidium diphyllum Lindm. is a heterosporous fern growing in wetlands and humid soils that are being converted to agricultural activities. Many products that are used in agriculture contain copper, resulting in surface and groundwater contamination. Germination and initial development tests were performed using Meyer's solution containing copper sulphate at concentrations of 0 (control), 1, 5, 10, 50 and 100 mg L-1. The experiment was conducted in a growth chamber at 25 ± 1ºC for 28 days, with a 12/12-hour light/dark cycle and a photon flux density of 100 µmol m-2 s-1. The lowest germination rate (6%) was observed at 100 mg L-1. Primary root growth was significantly reduced at > 10 mg L-1. Secondary leaves of sporophytes grown in concentrations >... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fern; Heavy metals; Pollution; Reproduction; Species conservation; Wetlands. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100004 |
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| Silva, João Paulo Siqueira da; Nascimento, Clístenes Williams Araújo do; Nascimento, Alexsandra Xavier do; Silva, Yuri Jacques Bezerra da; Biondi, Caroline Miranda. |
| The relationship between soil and health is important for populations that depend on the local environment to meet their nutritional needs. This study aimed to evaluate the concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities. We collected samples of soil, edible parts of crops and urine of farmers and family members in 23 crop fields in agroecological communities from northeast Brazil. These samples were analyzed to concentrations of Al, As, Ca, Cr, Cu, Fe, Hg, Mg, Zn, and Pb in urine and discriminant analysis and principal component analysis were used to assess the data. Concentrations of potentially toxic elements in soils and crops of agroecosystems were below regulatory... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Agroecossystems; Biomonitoring.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42623 |
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| Silva, João Paulo Siqueira da; Nascimento, Clístenes Williams Araújo do; Nascimento, Alexsandra Xavier do; Silva, Yuri Jacques Bezerra da; Biondi, Caroline Miranda. |
| The relationship between soil and health is important for populations that depend on the local environment to meet their nutritional needs. This study aimed to evaluate the concentrations of major and trace elements in the soils, edible parts of crops and urine of farmers in agroecological communities. We collected samples of soil, edible parts of crops and urine of farmers and family members in 23 crop fields in agroecological communities from northeast Brazil. These samples were analyzed to concentrations of Al, As, Ca, Cr, Cu, Fe, Hg, Mg, Zn, and Pb in urine and discriminant analysis and principal component analysis were used to assess the data. Concentrations of potentially toxic elements in soils and crops of agroecosystems were below regulatory... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Agroecossystems; Biomonitoring.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42623 |
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| Guimarães, Aretha Franklin; Querido, Luciano Carramaschi de Alagão; Coelho, Polyanne Aparecida; Santos, Paola Ferreira; Santos, Rubens Manoel dos. |
| Serpentine soils are those holding at least of 70% iron-magnesium compounds, which make life intolerable for many species. Although plant's adaptation to environmental toughness is widely studied in tropics, virtually nothing is known about Brazilian serpentine flora. Our aim was to bring up and characterize the serpentine flora in Bom Sucesso, Minas Gerais state, Brazil. We performed expeditions utilizing rapid survey sampling method to identify the arboreal compound in the area. Plants within circumference at breast high (CBH) up to 15,7 cm were included in our study. A specialist identified all the individuals to species level. We found 246 species located in 59 botanical families. Fabaceae, Myrtaceae and Melastomataceae were the most representative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ultramafic vegetation; Trace elements; Heavy metals; Serpentine soil.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/44594 |
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| Costa, Gislaine Rezer; Rocha, Mariana Balhego; Querol, Marcus Vinicius Morini; Dal Magro, Jacir; Machado, Michel Mansur; Oliveira, Luís Flávio Souza de. |
| This study assessed the limnology from the Medium Uruguay River Basin in Uruguaiana, Brazil, with a focus on the concentration of heavy metals (Cd, Cu, and Mn), to assess the toxicological potential (cytotoxicity and genotoxicity) for humans using as biological matrix of study human leukocyte cells. The conductivity, resistivity, and dissolved O2 levels exceeded the limits recommended by the National Environmental Council (Conselho Nacional do Meio Ambiente - CONAMA). The percentage of non-viable human leukocyte cells exposed to water samples was approximately 20% higher than that of the negative control (<3%), but similar to the positive control. The DNA damage index was high for all heavy metal concentrations assayed when compared to the negative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.00.00.00-6 ecotoxicology; Genotoxicity; Limnology; Heavy metals; Uruguay River Basin Ecotoxicologia. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31998 |
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| Iannacone O.,José; Alvariño F.,Lorena. |
| Environmental risk assessment (ERA) of terrestrial environments polluted by heavy metals in Peru requires standardized biological organisms, the use of which is simple, practical, sensitive and repeatable, such as seeds of higher plants used in eco-toxicological bioassays. The aim of this research was to evaluate the phytotoxic effects of Cr6+, Hg2+ and Pb2+ as potassium dichromate (K2Cr(2)0(7)), mercury chloride (Cl2Hg) and lead acetate ((CH3C00)2Pb), respectively, on growing roots of four species of higher terrestrial plants: onions (Allium cepa L., Liliaceae), red beets (Beta vulgaris L., Chenopodiaceae), rice (Oriza sativa L., Poaceae) and radishes (Raphanus sativus L., Brassicaceae) at 192 h (8 days) exposure. Bioassays of static sub-lethal toxicity... |
| Tipo: Journal article |
Palavras-chave: Heavy metals; Peru; Seeds; Vascular plants; Seeds; Mining waste; Chromium; Mercury; Lead. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000200009 |
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| Pereira,Edisio; Baptista-Neto,José A.; Smith,Bernard J.; Mcallister,John J.. |
| In this study, geochemical and particle size analyses of thirty-four street sediment samples collected from an urban environment around Guanabara Bay, shows highway run-off to be a potential source of heavy metals for the pollution of near-shore sedimentary deposits. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni were found to be higher in these sediments when compared to concentrations found in samples from the natural environment, where an Enrichment Factor (EF) index was used to distinguish between natural and anthropogenic sources. Particle size analysis shows these sediments to be predominantly composed of sand and no distribution pattern was observed between the sand, silt and clay fractions. High levels of organic matter and heavy metals would... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Urban runoff; Guanabara Bay. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400013 |
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| Fonseca,Estefan M; Baptista Neto,José A; Fernandez,Marcos A; Mcalister,John; Smith,Bernard. |
| The accelerated urbanisation without a planning, brought several environmental problems to Rio de Janeiro coastal zone, especially in areas such as Rodrigo de Freitas lagoon, which receives a great amount of untreated sewage every day. To assess the nature, potentially sources and extent of heavy metal pollution in the lagoon, sediments from the surrounding streets, from the entrance of the main canal that drains to the lagoon and from the bottom of the lagoon were collected and analysed by a modified selective extraction procedure in order to study the geochemical partitioning and bioavailability of Zn, Cu, Cr, Ni and Pb in these three compartments. The present study verified an increase in the Cu, Pb and Zn concentrations in the north of the Rodrigo de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Rodrigo de Freitas lagoon; Sediments. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200008 |
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| GONZÁLEZ-MENDOZA,DANIEL; TRONCOSO-ROJAS,ROSALBA; GONZALEZ-SOTO,TANIA; GRIMALDO-JUAREZ,ONECIMO; CECEÑA-DURAN,CARLOS; DURAN-HERNANDEZ,DAGOBERTO; GUTIERREZ-MICELI,FEDERICO. |
| ABSTRACT The aim of the present work is to evaluate the changes on the phenylalanine ammonia lyase (PAL) activity, phenolic compounds accumulation and photochemical efficiency in leaves of P. glandulosa treated with Cd2+ (0.001 M) and Cu2+ (0.52 M) concentrations for 96 h under hydroponic conditions. The results showed that only leaves treated with copper had a decrease in photochemical efficiency and leaf epidermal polyphenols in P. glandulosa leaves after 96 h of exposure. On the other hand the reverse-phase HPLC analysis revealed higher levels of phenolic compound (gallic, vanillic and caffeic acids) and flavonoids (rutin and kaempferol-3-O-glucosides) in plant leaves from Cu and Cd-treatments with respect to control plants. Finally, highest increments... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Prosopis glandulosa; Flavonoids; Chlorophyll a fluorescence. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401465 |
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| PEREIRA,FABRICIO J.; CASTRO,EVARISTO M. DE; OLIVEIRA,CYNTHIA DE; PIRES,MARINÊS F.; PEREIRA,MARCIO P.; RAMOS,SILVIO J.; FAQUIN,VALDEMAR. |
| This study aimed at verifying the lead tolerance of water hyacinth and at looking at consequent anatomical and physiological modifications. Water hyacinth plants were grown on nutrient solutions with five different lead concentrations: 0.00, 0.50, 1.00, 2.00 and 4.00 mg L–1 by 20 days. Photosynthesis, transpiration, stomatal conductance and the Ci/Ca rate were measured at the end of 15 days of experiment. At the end of the experiment, the anatomical modifications in the roots and leaves, and the activity of antioxidant system enzymes, were evaluated. Photosynthetic and Ci/Ca rates were both increased under all lead treatments. Leaf anatomy did not exhibit any evidence of toxicity effects, but showed modifications of the stomata and in the thickness of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Ecophysiology; Plant anatomy; Macrophytes. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301423 |
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| ZOCCHE,JAIRO J.; ROHR,PAULA; DAMIANI,ADRIANI P.; LEFFA,DANIELA D.; MARTINS,MIRIAM C.; ZOCCHE,CAROLINE M.; TEIXEIRA,KARINA O.; BORGES,GABRIELA D.; JESUS,MAIELLEN M. DE; SANTOS,CARLA E.I. DOS; DIAS,JOHNNY F.; ANDRADE,VANESSA M. DE. |
| ABSTRACT We assessed elemental composition of the liver in mice subjected to one-time or chronic consumption of the juice of vegetables cultivated in a vegetable garden built over deposits of coal waste. Lactuca sativa L. (lettuce), Beta vulgaris L. (beet), Brassica oleracea L. var. italica (broccoli) and Brassica oleracea L. var. acephala (kale) were collected from the coal-mining area and from a certified organic farm (control). Elemental composition was analyzed by particle-induced X-ray emission (PIXE) method. Concentrations of Mg, S, and Ca of mice subjected to one-time consumption of broccoli and concentrations of these same elements plus Si of mice receiving kale were higher in the coal-mining area. Concentrations of P, K, and Cu were increase after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coal; Anthropogenic soil; Trace elements; Heavy metals; Plants; PIXE. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502383 |
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| Oliveira,Sonia M.B. de; Pessenda,Luiz C.R.; Gouveia,Suzy E.M.; Favaro,Deborah I.T.. |
| This paper examines the role of parent rock, pedogenetic processes and airborne pollution in heavy metal accumulation in soils from a remote oceanic island, Fernando de Noronha, Brazil. We studied five soil profiles developed from different volcanic rocks. Mineralogical composition and total concentrations of major and trace elements were determined in 43 samples. The obtained concentrations range for heavy metals were: Co: 26-261 ppm; Cu: 35-97 ppm; Cr: 350-1446 ppm; Ni: 114-691 ppm; Zn: 101-374 ppm; Hg: 2-150 ppb. The composition of soils is strongly affected by the geochemical character of the parent rock. Pedogenesis appears to be responsible for the accumulation of Zn, Co, and, to a lesser extent, of Ni and Cu, in the upper, Mn- and organic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Soils; Anthropogenic mercury; Fernando de Noronha. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400007 |
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| MAY JÚNIOR,JOARES A.; QUIGLEY,HOWARD; HOOGESTEIJN,RAFAEL; TORTATO,FERNANDO R.; DEVLIN,ALLISON; CARVALHO JÚNIOR,RUI M. DE; MORATO,RONALDO G.; SARTORELLO,LEONARDO R.; RAMPIM,LILIAN E.; HABERFELD,MARIO; PAULA,ROGÉRIO C. DE; ZOCCHE,JAIRO JOSÉ. |
| ABSTRACT The Pantanal is the largest inland wetland in the world and is under increasing anthropogenic threats, including long-term regionally intensive gold mining practices. Gold mining activities are known to cause the release of harmful pollutants such as mercury (Hg) to the surrounding environment. Jaguars (Panthera onca (Linnaeus, 1758)) are apex predators, and therefore show great potential to accumulate Hg by biomagnification. We hypothesize that total Hg content in the fur of jaguars from two sites within the Brazilian Pantanal would be significantly different as a function of distance from active gold mining operations. The Hg content was determined by fluorescence spectrometry. The mean ± SD Hg content in jaguars from the study site influenced... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomagnification; Heavy metals; Mammal; Wetland. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502129 |
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| KOCH,NATÁLIA MOSSMANN; LUCHETA,FABIANE; KÄFFER,MÁRCIA ISABEL; MARTINS,SUZANA MARIA DE AZEVEDO; VARGAS,VERA MARIA FERRÃO. |
| Abstract Based on the need to monitor air pollution and on the importance of doing it with biological organisms, the present work had as main objective to assess air quality in urban areas through lichen transplants. Besides, we also tested whether there were differences among the studied sites, aiming to point out the main pollution characteristics of the areas. The monitoring was carried out in seven cities, which varied from mainly rural to mainly industrial, in Rio Grande do Sul, southern Brazil. The foliose lichen Parmotrema tinctorum was used as the biomonitor species. Physiological tests and contents of sulphur and heavy metals were measured in the lichen thalli. Other pollutants assessed through air samplers were available for some cities, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air pollution; Biomonitoring; Greenhouse gases; Heavy metals; Lichenized fungi; Particulate matter. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502233 |
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| Registros recuperados: 204 | |
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