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Registros recuperados: 54
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Copper toxicity for Scinax ruber and Rhinella granulosa (Amphibia: Anura) of the Amazon: Potential of Biotic Ligand Model to predict toxicity in urban streams Acta Amazonica
Franco-de-Sá,Jorge Felipe Oliveira; Val,Adalberto Luis.
In the last years many populations of anurans have declined and extinctions have been recorded. They were related to environmental pollution, changes of land use and emerging diseases. The main objective of this study was to determine copper sensitivity of the anuran of the Amazon Rhinella granulosa and Scinax ruber tadpoles at stage 25 and Scinax ruber eggs exposed for 96 h to copper concentrations ranging from 15 µg Cu L-1 to 94 µg Cu L-1. LC50 at 96 h of Rhinella granulosa Gosner 25, Scinax ruber Gosner 25 and Scinax ruber eggs in black water of the Amazon were 23.48, 36.37 and 50.02 µg Cu L-1, respectively. The Biotic Ligand Model was used to predict the LC50 values for these species and it can be considered a promising tool for these tropical species...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amphibian; LC50-96h; Copper; BLM; Water pollution.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400010
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Determination of selenium toxicity to Oreochromis niloticus based on hematological parameters - doi: 10.4025/actascibiolsci.v34i2.8755 Biological Sciences
Seriani, Robson; Instituto de Pesca-SP - IP/SAA.; Ranzani-Paiva, Maria José Tavares; Instituto de Pesca-SP - IP/SAA.; Gonçalves, Adriano; Centro de Aquicultura, Universidade Estadual Paulista “Júlio de Mesquita Filho"; Siqueira, Silmara Regina; Instituto de Pesca-SP - IP/SAA.; Lombardi, Julio Vicente; Instituto de Pesca-SP - IP/SAA..
Selenium (Se) is described as an essential micronutrient and participates in different biological functions, as the antioxidant defense systems maintenance and regulation. However, when in high concentrations, Se may cause toxic effects as well as hematological changes in fish. The aim of the present study was to determine the toxicity of selenium in the form of sodium selenate (Na2Se6+O4) in Oreochromis niloticus based on hematological parameters, after exposure to different concentrations (0.01, 0.14 and 1.4 mg Se6+ L-1). The erythrocytic and leukocytic series were examined over 14 days at intervals of 0, 3, 5, 7,10 and 14 days. The erythrocytic series showed significant alterations in the first 7 days, including the control group. Neutrophils and...
Palavras-chave: 2.07.01.00-4 haematological; Water pollution; Selenium; Toxicity Fisiologia.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8755
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Contiguous urban rivers should not be necessarily submitted to the same management plan: the case of Tietê and Pinheiros Rivers (São Paulo-Brazil) Anais da ABC (AABC)
Cunha,Davi G. F.; Grull,Doron; Damato,Murilo; Blum,José R. C.; Eiger,Sergio; Lutti,José E.I.; Mancuso,Pedro C. S..
The management of urban water resources plays an important role for developing countries. The Tietê and Pinheiros Rivers (São Paulo, Brazil) are affected by domestic and industrial effluents and by the diffuse pollution. This research aimed to quantify 134 variables in the water of Tietê and Pinheiros Rivers (approximately 7,200 and 6,600 analyses, respectively) from August 2007 to December 2008. The idea was to verify if the fact that both rivers are located in the same basin is enough to consider the application of a single management plan for both. Data showed that the rivers presented significant anthropogenic interference. The results suggested that such rivers must be subjected to individual management plans since there were exclusive occurrences...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental monitoring; Metropolitan region of São Paulo (MRSP); Urban rivers; Water pollution; Water quality; Watershed management.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400032
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Enterococcus spp. Resistant to Multiple Antimicrobial Drugs and Determination of Fecal Contamination Levels in Mangrove Oysters (Crassostrea rhizophorae) BABT
Rubião,Cynthia Annes; Franco,Robson Maia; Mesquita,Eliana de Fátima Marques de; Miguel,Marco Antonio Lemos; Cabral,Claudius Couto; Fonseca,Ana Beatriz Monteiro.
ABSTRACT The aim of this study was to determine and compare the Most Probable Number (MPN) of Total Coliforms (TC), Escherichia coli and Enterococcus spp. and to characterize the antimicrobial resistance profiles of Enterococcus spp. isolated from oysters collected in the Barra de Guaratiba Mangrove, Rio de Janeiro, Brazil. The enumeration of E. coli has been used to indicate fecal contamination and hygienic-sanitary conditions of bivalve molluscs. Enterococci are capable to transfer several antimicrobial resistance genes to pathogenic bacteria, including those from Gram-negative group. The oysters were bought from local fishermen and a total of 123 individuals were analyzed. The TC, E. coli and Enterococcus spp. MPN mean were 26,300/100 g, 3,260/100 g and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water pollution; Escherichia coli; Enterococcus spp.; Antimicrobial resistance; Bivalve molluscs.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100308
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Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation BABT
Gonzalez,Alessandra M.; Paranhos,Rodolfo; Andrade,Luciana; Valentin,Jean L..
The aim of this work was to evaluate the necessary ³H-leucine concentration to estimate bacterial production in Guanabara Bay through saturation curves. A second aim was to collect preliminary data of bacterial production in two distinct sites corresponding to different water qualities: Urca inlet and Governador Island. Saturation curves were made with water samples taken at the main circulation channel of the bay, Paquetá Island, and the two sites mentioned before. The ³H-leucine curves showed similar pattern for all studied areas, indicating the ideal isotope concentration to be 10 nM. Bacterial biomass production ranged from 0.40 to 4.53 µgC L-1 h-1 in Urca and from 3.86 to 73.72 µgC L-1 h-1 in Governador Island indicating the relationship between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Activity measurement; Heterothrophic production; Estuary; Water pollution; Eutrophication.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500008
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Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil BABT
Marques Júnior,Aguinaldo Nepomuceno; Crapez,Mirian Araujo Carlos; Barboza,Conceição Denise Nunes.
The present study aimed to evaluate the water quality of the Icaraí Sewage Outfall (ISEO) area. Sampling was conducted during winter and summer, and water samples were analyzed for dissolved oxygen, pH, temperature, salinity, dissolved inorganic nutrients (DIN), seston, particulate organic matter (POM), and pigments. Results showed that the water chemistry of the area suffers temporal and spatial variation. Great variability was also seen in the C:N:P ratios of POM (August, 112:30:1; December, 59:11:1) and in the DIN concentrations. Chlorophyll-a and ammonium concentrations (4.5 µg L-1 - 71.2 µg L-1, and 0.20 µM - 52,6 µM, respectively) characterized the ISEO area as eutrophic. The dispersal of the material was not effective under certain oceanographic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eutrophication; Sewage outfall; Water pollution; Nutrients; Guanabara Bay.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500014
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Comparison between four and seven-day Ceriodaphnia dubia survival and reproduction test protocols using oil refinery effluent samples BABT
Oliveira-Filho,Eduardo Cyrino; Da-Matta,Anndressa Camillo; Cabral,Lucianna Lopes; Veiga,Letícia Falcão; Paumgartten,Francisco José Roma.
The aim of this study was to compare the 7-day Ceriodaphnia dubia survival and reproduction test with a 4 day test to evaluate the toxicity of oil refinery effluents. Both shown identical NOECs with three of 6 tested samples. With one of the tested samples, the 4-day NOEC was one tested-concentration lower, and with the remaining two samples, it was one tested-concentration higher than those obtained using the 7-day protocol. Then results suggested that 4 and 7-day protocols were comparable to detect toxic effects.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic toxicology; Water pollution; Ecotoxicology; Oil refinery effluents; Reproduction; Aquatic chronic tests.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100017
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Heterotrophic bacteria abundances in Rodrigo de Freitas Lagoon (Rio de Janeiro, Brazil) BJM
Gonzalez,Alessandra M.; Paranhos,Rodolfo; Lutterbach,Márcia S..
The Rodrigo de Freitas Lagoon (RJ, Brazil) is an important coastal ecosystem that has been submitted to an accelerated degradation process. The aim of this work was to determine the abundance and the spatial distribution of total heterotrophic (by flow cytometry) and cultivated bacteria ("pour plate" method on R2A agar). Another objective was to evaluate the lagoon's influence on water quality of Ipanema and Leblon beaches. Physical and chemical data were acquired too. Sub-superficial water samples were taken monthly, from December 1999 to October 2000. On lagoon, the cultivated bacteria abundance varied from 6.9x10(5) to 5.0x10(7) CFU.100 mL-1. On Ipanema and Leblon beaches, this parameter yielded 1.4x10(5) and 2.8x10(6) CFU.100 mL-1, respectively. Total...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Flow cytometry; Eutrophication; Water pollution; Rodrigo de Freitas Lagoon.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000400005
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Physiological responses of Eichhornia crassipes [Mart.] Solms to the combined exposure to excess nutrients and Hg Braz. J. Plant Physiol.
Caldelas,Cristina; Iglesia-Turiño,Santiago; Araus,Jose L.; Bort,Jordi; Febrero,Anna.
In the present study the physiological response of water hyacinth (Eichhornia crassipes [Mart.] Solms) to the combined exposure of excess nutrients and Hg was examined. Young water hyacinth plants were exposed to a range of HgCl2 and KNO3 concentrations. After eight weeks, submerged plant tissues reached an Hg concentration of 4 mg g-1. The accumulation of P and S was reduced by the addition of HgCl2, and also the P and K concentrations in emerged and submerged parts decreased. In contrast, the addition of HgCl2 increased Ca and Mg concentrations in submerged parts. Furthermore, the concentration ratios of submerged/emerged parts for Ca, Mg and P were also reduced by the addition of HgCl2. The interaction of HgCl2 and KNO3 was synergistic and decreased...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abiotic stress; Metal accumulation; Multiple stress; Phytoremediation; Water eutrophication; Water pollution.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100002
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Contaminación del agua con nitratos y nitritos y su impacto en la salud pública en la zona de influencia del módulo de riego (I-1) La Antigua, Ver. México. Colegio de Postgraduados
Galaviz Villa, Itzel.
La contaminación de las aguas emerge como una consecuencia de los asentamientos humanos y de las actividades rurales, agrícolas, silvícolas e industriales en una región. Se ha encontrado que al incrementarse el uso de fertilizantes nitrogenados también se produce un mayor impacto contaminante en las aguas. Los nitratos y nitritos disueltos en agua subterránea, destinada al consumo humano, ocasionan efectos negativos en la salud, tales como; la producción de nitrosaminas (causa del cáncer) y la disminución de la capacidad de transporte de oxígeno por la sangre, conocida como síndrome del bebe azul. El objetivo del presente estudio fue determinar la relación entre la concentración de nitratos y nitritos disueltos en el agua de consumo humano, y la incidencia...
Palavras-chave: Agroecosistemas; Fertilizantes nitrogenados; Contaminación del agua; Cáncer; Agroecosystems; Nitrogen fertilizers; Water pollution; Cancer; Doctorado; Agroecosistemas Tropicales.
Ano: 2010 URL: http://hdl.handle.net/10521/429
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Frequency of transferable multiple antibiotic resistance amongst coliform bacteria isolated from a treated sewage effluent in Antofagasta, Chile Electron. J. Biotechnol.
Silva,Juan; Castillo,Gabriela; Callejas,Lorena; López,Héctor; Olmos,Janet.
Antibiotic-resistant coliform bacteria from raw and treated water from activated sludge of a sewage treatment plant were isolated on eosin methylene blue agar (EMB) plates in the separate presence of ampicillin, tetracycline, chloramphenicol and streptomycin. Antibiotic resistant coliforms obtained from inflow and effluent waters were studied to determine influences of treatment on the species composition, resistance patterns and transferable resistance in these bacteria. The bacterial counts obtained showed a high proportion of antibiotic resistant coliforms in the treated effluent. The resistant coliform species were eliminated at different rates by the treatment. Escherichia coli decreased, whereas the proportion of Klebsiella sp increased. The...
Tipo: Journal article Palavras-chave: Antibiotic resistance; Coliforms; Plasmid; Sewage treatment; Water pollution.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000500008
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Warning system based on theoretical-experimental study of dispersion of soluble pollutants in rivers REA
Ribeiro,Celso B. de M.; Silva,Demétrius D. da; Soares,José H. P.; Guedes,Hugo A. S..
Information about capacity of transport and dispersion of soluble pollutants in natural streams are important in the management of water resources, especially in planning preventive measures to minimize the problems caused by accidental or intentional waste, in public health and economic activities that depend on the use of water. Considering this importance, this study aimed to develop a warning system for rivers, based on experimental techniques using tracers and analytical equations of one-dimensional transport of soluble pollutants conservative, to subsidizing the decision-making in the management of water resources. The system was development in JAVA programming language and MySQL database can predict the travel time of pollutants clouds from a point...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Longitudinal dispersion; Water pollution; Computational modeling.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000500016
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Характеристика абиотических компонент экологического состояния порта Николаев IBSS Repository
Тайченачев, Д. В.; Миньковская, Р.Я.; Демидов, А. Н..
Дана характеристика экологического состояния акватории порта Николаев и факторов, его обуславливающих, на основе анализа загрязненности, гидрометеорологических и гидрохимических параметров водной среды, наблюдаемых сетевыми подразделениями Минэкоресурсов Украины.
Tipo: Journal Contribution Palavras-chave: Water pollution; Water pollution; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 2001 URL: http://repository.ibss.org.ua/dspace/handle/99011/571
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Resíduos de agrotóxicos em águas do Rio Dourados, Mato Grosso do Sul. Infoteca-e
SCORZA JUNIOR, R. P.; LANA, J. T. de O.; SILVA, G. B. S. da; LOEBMANN, D. G. dos S. W.; ALMEIDA, E. G. de.
Estudos de monitoramento dos resíduos de agrotóxicos em ? águas superficiais são necessários para avaliar os níveis de exposição de organismos não alvos, incluindo os seres humanos. Este trabalho teve como objetivo monitorar resíduos de 46 diferentes agrotóxicos e seus produtos de degradação em amostras de água do Rio Dourados, Mato Grosso do Sul. Amostras foram coletadas mensalmente ou quinzenalmente, em três pontos de amostragem, durante o período de dezembro de 2019 a dezembro de 2020. Para análise, utilizou-se um método multirresíduo, com extração em fase sólida (SPE) e separação e identificação com cromatografia líquida de ultraperformance acoplada à espectrometria de massas (UPLC-MS-MS). Os limites de quantificação (LQ) para os diferentes agrotóxicos...
Tipo: Folhetos Palavras-chave: Contaminação; Meio Ambiente Aquático; Águas Pluviais; Águas Superficiais; Pesticida; Recurso Hídrico; Aquatic environment; Pesticides; Water pollution; River water.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1130741
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Agricultura e qualidade da agua: contaminacao da agua por nitrato. Infoteca-e
RESENDE, A. V. de.
CRI6560
Tipo: Folhetos Palavras-chave: Contamination; Health; Contaminação; Fósforo; Impacto Ambiental; Nitrogênio; Poluição da Água; Recurso Hídrico; Saúde; Qualidade da Água; Eutrophication; Environmental impact; Nitrogen; Phosphorus; Nitrates; Water quality; Water resources; Water pollution.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546464
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Potencial de impacto da agricultura sobre os recursos hídricos na região do cerrado. Infoteca-e
OLIVEIRA-FILHO, E. C. de; LIMA, J. E. F. W..
CRI6558
Tipo: Livros Palavras-chave: Contamination; Chemicals; Agricultural chemicals; Agrotóxico; Cerrado; Contaminação; Fertilizante; Impacto Ambiental; Produto Químico; Poluição da Água; Qualidade da Água; Recurso Hídrico; Toxicologia; Fertilizers; Environmental impact; Toxicology; Water resources; Water pollution; Water quality.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567742
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Potencial de uso de plantas aquáticas na despoluição da água. Infoteca-e
POTT, V. J.; POTT. A..
A água é um bem limitado, razão da crescente preocupação com os recursos hidrícos e a qualidade ambiental. A poluião é um sério problema que impacta nascentes e cursos d'agua, havendo necessidade urgente de pesquisas de tratamento e de preservação. Uma das formas de tratamento de esgoto é a utilizção de filtros biológicos, com brejos construídos, ou de lagoas com plantas aquáticas. Tanques com plantas aquáticas assim como brejos agem com filtros de poluentes, ajudando a devolver a água limpa aos manaciais. Algumas plantas despoluidoras são sugeridas pela sua capacidade de retirar da água nutrientes e substâncias tóxicas, dando condições favoráveis para a base alimentar nos ecossistemas aquáticos. Lemnaceas ou lentilhas d'água são muito usadas no caso das...
Tipo: Folhetos Palavras-chave: Poluição da Água; Planta Aquatica; Tratamento da Água; Aquatic plants; Water pollution; Water purification.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/325560
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O uso do sulfato de cobre em ecossistemas aquáticos: fatores que afetam sua toxicidade em peixes de água doce. Infoteca-e
SAMPAIO, F. G.; BOIJINK, C. de L.; RANTIN, F. T..
O aumento mundial da contaminação de sistemas de água doce com inúmeros compostos químicos industriais e naturais é hoje um dos principais problemas ambientais.Mineração, emissão de esgoto doméstico, aplicação de fertilizantes e pesticidas degradam severamente os ecossistemas aquáticos com metais pesados. A aquicultura, caracterizada nas últimas décadas como potencial atividade agropecuária não está isenta desta negativa contribuição, uma vez que utiliza, em sua cadeia produtiva, compostos que interferem diretamente na cadeia trófica dos sistemas aquícolas. Dentre os principais produtos utilizados na piscicultura, para contornar as dificuldades no processo produtivo, pode-se citar o sulfato de cobre (CuSO4) que, quando utilizado indevidamente, gera efeitos...
Tipo: Livros Palavras-chave: Ecossistema aquático; Sulfato de cobre; Poluição da água; Peixe de água doce; Toxidez; Aquicultura; Copper sulfate; Water pollution; Toxicity; Freshwater fish; Fish culture.
Ano: 2013 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/963179
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Partially supervised oil-slick detection by SAR imagery using kernel expansion ArchiMer
Mercier, Grégoire; Ardhuin, Fanny.
Spaceborne synthetic aperture radar (SAR) is well adapted to detect ocean pollution independently from daily or weather conditions. In fact, oil slicks have a specific impact on ocean wave spectra. Initial wave spectra may be characterized by three kinds of waves, namely big, medium, and small, which correspond physically to gravity and gravity-capillary waves. The increase of viscosity, due to the presence of oil damps gravity-capillary waves. This induces not only a damping of the backscattering to the sensor but also a damping of the energy of the wave spectra. Thus, local segmentation of wave spectra may be achieved by the segmentation of a multiscale decomposition of the original SAR image. In this paper, a semisupervised oil-slick detection is...
Tipo: Text Palavras-chave: Water pollution; Synthetic aperture radar; Sea surface; Satellite applications; Oil spill; Image analysis.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1948.pdf
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Grow-out mariculture techniques in tropical waters: A case study of problems and solutions in Hong Kong. ArchiMer
Wu, R; Lee, J.
Raft culture is practised and trash fish is being used as feed in Hong Kong. Culture space is limited and most of the culture sites are over-crowded. Food conversion ratio is poor (about 10-15), grow-out mortality is high (30-50%) and fish kills caused by oxygen depletions, algal blooms and red tides occur frequently. Disease and water pollution are also problems.
Tipo: Text Palavras-chave: Sparidae; Pisces; Indicator species; Diseases; Water pollution; Cage culture; Artificial feeding; Food fish; Oxygen depletion; Mortality; Growth; Stocking density; Fish culture.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-1427.pdf
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