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Texto completo SciELO Chile
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Id: biblio-959444
Autor: Millanao, Ana R; Barrientos-Schaffeld, Carolina; Siegel-Tike, Claudio D; Tomova, Alexandra; Ivanova, Larisa; Godfrey, Henry P; Dölz, Humberto J; Buschmann, Alejandro H; Cabello, Felipe C.
Título: Resistencia a los antimicrobianos en Chile y el paradigma de Una Salud: manejando los riesgos para la salud pública humana y animal resultante del uso de antimicrobianos en la acuicultura del salmón y en medicina / Antimicrobial resistance in Chile and The One Health paradigm: dealing with threats to human and veterinary health resulting from antimicrobial use in salmon aquaculture and the clinic
Fonte: Rev. chil. infectol;35(3):299-308, 2018. graf.
Idioma: es.
Resumo: El aumento de la resistencia bacteriana múltiple a antimicrobianos es considerado una gran amenaza para la salud pública mundial y como generador de una importante crisis en el funcionamiento de los sistemas de salud. Esta crisis es discutida diariamente por los gobiernos y los parlamentos, las instituciones globales de salud, fundaciones benéficas y de científicos y de profesionales de la salud y también de consumidores de productos animales. En todos los países del orbe se ha identificado al uso de antimicrobianos en la crianza industrial de animales como un importante determinante en la selección de esta resistencia. Aprovechando la oportunidad que se ha planteado en Chile con el diseño del Plan Nacional Contra la Resistencia a los Antimicrobianos, hemos creído importante revisitar y actualizar sumariamente nuestros estudios sobre el uso de antimicrobianos en la acuicultura del salmón y de su potencial impacto en el ambiente y la salud humana y animal. Estos estudios indican que 95% de tres grupos de antimicrobianos importados al país, que incluyen tetraciclinas, fenicoles y quinolonas, son usados en medicina veterinaria y mayormente en la acuicultura del salmón. Nuestros estudios indican que el excesivo uso de estos antimicrobianos genera la presencia de residuos de antimicrobianos en el ambiente marino hasta 8 km de los sitios de acuicultura, los que seleccionan a bacterias con resistencia múltiple en dicho ambiente, ya que ellas contienen variados genes de resistencia a estos antimicrobianos. Estos genes de resistencia están contenidos en elementos genéticos móviles incluyendo plásmidos e integrones, los que son trasmitidos a otras bacterias permitiendo su potencial diseminación epidémica entre poblaciones bacterianas. Bacterias del ambiente marino contienen genes idénticos a los genes de resistencia a quinolonas e integrones similares a los de patógenos humanos, sugiriendo comunicación genética entre estas bacterias de diversos ambientes. Alrededor de los recintos de acuicultura, este uso exagerado de antimicrobianos contamina con ellos también a peces silvestres para consumo humano y potencialmente selecciona BRA en su carne y en los productos de acuicultura. El consumo de estos productos selecciona bacterias resistentes en el microbioma humano y facilita también el intercambio genético entre bacterias del ambiente acuático y la microbiota comensal y patógena humana. El pasaje de antimicrobianos al ambiente marino disminuye la diversidad en él, y potencialmente podría facilitar la aparición de florecimientos de algas nocivas, la infección de peces por patógenos piscícolas resistentes los antimicrobianos y la aparición de patógenos zoonóticos resistentes, incluyendo a Vibrio parahaemolyticus. Estos hallazgos sugieren que la prevención de infecciones en peces y la disminución del uso de antimicrobianos en su crianza, será en Chile un factor determinante en la prevención de infecciones humanas y animales con resistencia múltiple a los antimicrobianos, de acuerdo con el paradigma moderno e integral de Una Salud.

The emergence and dissemination of antimicrobial-resistant bacteria (ARB) is currently seen as one of the major threats to human and animal public health. Veterinary use of antimicrobials in both developing and developed countries is many-fold greater than their use in human medicine and is an important determinant in selection of ARB. In light of the recently outlined National Plan Against Antimicrobial Resistance in Chile, our findings on antimicrobial use in salmon aquaculture and their impact on the environment and human health are highly relevant. Ninety-five percent of tetracyclines, phenicols and quinolones imported into Chile between 1998 and 2015 were for veterinary use, mostly in salmon aquaculture. Excessive use of antimicrobials at aquaculture sites was associated with antimicrobial residues in marine sediments 8 km distant and the presence of resistant marine bacteria harboring easily transmissible resistance genes, in mobile genetic elements, to these same antimicrobials. Moreover, quinolone and integron resistance genes in human pathogens isolated from patients in coastal regions adjacent to aquaculture sites were identical to genes isolated from regional marine bacteria, consistent with genetic communication between bacteria in these different environments. Passage of antimicrobials into the marine environment can potentially diminish environmental diversity, contaminate wild fish for human consumption, and facilitate the appearance of harmful algal blooms and resistant zoonotic and human pathogens. Our findings suggest that changes in aquaculture in Chile that prevent fish infections and decrease antimicrobial usage will prove a determining factor in preventing human and animal infections with multiply-resistant ARB in accord with the modern paradigm of One Health.
Descritores: Poluentes Químicos da Água/análise
Aquicultura/métodos
Farmacorresistência Bacteriana/efeitos dos fármacos
Antibacterianos/efeitos adversos
-Salmão
Tetraciclinas/efeitos adversos
Infecções Bacterianas/prevenção & controle
Chile
Monitoramento Ambiental/métodos
Quinolonas/efeitos adversos
Limites: Humanos
Animais
Responsável: CL1.1 - Biblioteca Central


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Texto completo SciELO Brasil
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Id: biblio-1132189
Autor: Lenzi, Giane Gonçalves; Fuziki, Maria Eduarda Kounaris; Fidelis, Michel Zampieri; Fávaro, Yuri Barros; Ribeiro, Mauricio Aparecido; Chaves, Eduardo Sidinei; Lenzi, Ervin Kaminski.
Título: Caffeine Adsorption onto Bentonite Clay in Suspension and Immobilized
Fonte: Braz. arch. biol. technol;63:e20180637, 2020. tab, graf.
Idioma: en.
Resumo: Abstract This study describes the use of bentonite in suspension for the caffeine adsorption (pollutant of emerging concern) by taking different conditions of the pH, adsorbent mass, adsorbent calcination temperature and interferents into account. The results were compared with those obtained using bentonite immobilized in alginate beads. The acid medium has a greater efficiency for the caffeine adsorption and the adsorbent calcination temperature exerts, due to structural changes. Caffeine removal higher than 90% was obtained at optimized conditions. The Langmuir model indicated a better fit of the data and the adsorption capacity of caffeine onto bentonite. The bentonite immobilized led to a slower adsorption process in relation to the suspended.
Descritores: Poluentes Químicos da Água/isolamento & purificação
Bentonita/química
Cafeína/química
-Termodinâmica
Cafeína/efeitos adversos
Adsorção
Poluentes Ambientais/isolamento & purificação
Temperatura Alta
Concentração de Íons de Hidrogênio
Modelos Teóricos
Responsável: BR1.1 - BIREME


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Id: biblio-1132205
Autor: Campos, Fábio; Bueno, Rodrigo de Freitas; Piveli, Roque Passos.
Título: Influence of Landfill Leachate on Organic Matter Removal in Activated Sludge and Activated Sludge with Carrier Processes
Fonte: Braz. arch. biol. technol;63:e20180384, 2020. tab, graf.
Idioma: en.
Resumo: Abstract This study assessed the performance of two pilot units, a conventional activated sludge (CAS) and an Integrated Fixed-Film Activated Sludge (IAS), in the treatment of leachate from sanitary landfill combined with domestic sewage, with the aim of removing organic substances. In order to assess the possible impacts on treatment, three experimental phases were designed using influent leachate contributions of 5%, 10%, and 20% of the total BOD load. Overall, the results showed that no significant changes in the behavior of biological processes. The IAS unit presented average BOD removal efficiencies of above 88%, 87% and 80% for the three leachate load contributions of 5%, 10% and 20% studied. The CAS unit presented lower average efficiency with a 5% leachate contribution (64%), but displayed a similar performance to the IAS unit in the other phases (82% and 80%); similar quantitative aspects were observed for both treatment processes with regards to biomass composition analysis. The kinetic coefficients related to heterotrophic metabolism did not indicate negative effects on treatment efficiency as a result of the increase in leachate addition, with values of 2.8; 2.8 and 2.7 d-1 obtained respectively for each phase with the CAS unit, and 2.0; 1.5 and 1.6 d-1 with the IAS unit, representing similar values to those found in the literature (1.5 a 5.0 d-1). The results reinforced the conclusion that the leachate load introduced did not cause inhibition or significant alterations to heterotrophic metabolism, and, therefore, to the removal of organic matter.
Descritores: Poluentes Químicos da Água/metabolismo
Líquido Percolado
Lodos Ativados
Purificação da Água/métodos
Biomassa
-Projetos Piloto
Reatores Biológicos
Bactérias Heterotróficas
Matéria Orgânica
Limites: Humanos
Animais
Responsável: BR1.1 - BIREME


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Id: biblio-1153298
Autor: Hooda, Vikas; Verma, Neelam; Gahlaut, Anjum; Gothwal, Ashish.
Título: Reusable Enzymatic Strip for Detection of Arsenic
Fonte: Braz. arch. biol. technol;64:e21200132, 2021. tab, graf.
Idioma: en.
Resumo: HIGHLIGHTS Arsenic is considered as one of the highly hazardous elements in the environment and a serious carcinogen for the human health. An enzymatic method has been described by using arsenite oxidase for arsenic detection. Residual activity of the immobilized enzyme was 43% of the initial activity after being recycled 10 times.

Abstract Arsenic is considered as one of the highly hazardous elements in the environment and a serious carcinogen for the human health. More attention has taken towards the arsenic due to its presence in ground water in India, China, Bangladesh, Inner Mongolia and several other regions of the world. It's been a challenge to remove arsenic due to the lack of its efficient detection approach in the complicated environmental matrix. The proposed method describes an enzymatic method for arsenic determination using arsenite oxidase, which catalyzes the oxidation of arsenite to arsenate. Hence, a colorimetric PVC strip with immobilized arsenite oxidase has been developed to detect the arsenic concentration and also having potential for the field-testing. The influence of the optimal conditions i.e. pH, temperature, storage stability, and reusability of free and immobilized enzyme were evaluated and compared. The results have shown that the stabilities were significantly enhanced compared with free counterpart. Residual activity of the immobilized enzyme was 43% of the initial activity after being recycled 10 times. We approve that this novel low cost immobilized carrier presents a new approach in large scale applications and expected to act as a model for establishment of indigenous arsenic sensor in miniature form.
Descritores: Arsênio/análise
Cloreto de Polivinila/análise
Poluentes Químicos da Água/análise
Água Subterrânea/análise
Enzimas Imobilizadas/análise
-Oxirredutases
Biodegradação Ambiental
Limites: Humanos
Responsável: BR1.1 - BIREME


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Texto completo SciELO Saúde Pública
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Id: biblio-974747
Autor: Quevedo, Claudia Maria Gomes; Paganini, Wanderley Silva.
Título: A disponibilização de fósforo nas águas pelo uso de detergentes em pó: aspectos ambientais e de Saúde Pública / Phosphorus delivered to surface waters resulting from the use of powder detergents: environmental and public health aspects
Fonte: Ciênc. Saúde Colet;23(11):3891-3902, Oct. 2018. tab, graf.
Idioma: pt.
Resumo: Resumo Este artigo aborda a interface social e ambiental da presença de fósforo nas águas de abastecimento, dimensionando os impactos ocasionados pelo uso de detergentes fosfatados em pó sobre a qualidade e a disponibilidade dos recursos hídricos, no tocante à ocorrência da eutrofização. Com base em dados a respeito da formulação e consumo dos produtos comercializados no Brasil, relata a evolução do assunto e apresenta o retrato da situação atual. Indica que os detergentes brasileiros possuem, hoje, baixa concentração de fósforo, de forma que representam um reduzido risco de impacto sobre o nível trófico das águas. Pontua, entretanto, a necessidade de ajustar o conteúdo da legislação à prática do mercado e de aprimorar as políticas públicas relacionadas com a educação ambiental. Mediante um processo efetivo de comunicação e educação, será possível conscientizar a população acerca do assunto, contribuindo para a manutenção do controle dessa importante fonte de fósforo no meio ambiente e para o aumento da disponibilidade hídrica, por meio da prevenção dos processos de eutrofização.

Abstract This article addresses the social and environmental aspects related to the presence of phosphorus in surface water bodies, assessing the impacts caused by the utilization of powder detergents on the quality and availability of water resources, with particular respect to the occurrence of eutrophication. Based on data concerning the composition and consumption of the products currently sold in Brazil, the evolution of this phenomenon leading to the current situation is reported. Indications are that Brazilian detergents have a low phosphorus content, thus it is possible to infer that these products offer a small risk of impacting the trophic levels of surface waters. There is, however, a need to adjust the content of legislation to market practices, as well as improve public policies related to environmental education. By means of an intensive process of communication and education, awareness about the issue can be raised, keeping this major source of phosphorus in the environment under control and contributing to the increase in the availability of water, through the prevention of eutrophication processes.
Descritores: Fósforo/análise
Monitoramento Ambiental/métodos
Saúde Pública
Detergentes/química
-Poluentes Químicos da Água/análise
Brasil
Eutrofização
Limites: Humanos
Responsável: BR1.1 - BIREME


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Id: biblio-1055737
Autor: Ismael, Luara Lourenço; Rocha, Elisângela Maria Rodrigues.
Título: Estimativa de contaminação de águas subterrâneas e superficiais por agrotóxicos em área sucroalcooleira, Santa Rita/PB, Brasil / Estimate of the contamination of groundwater and surface water due to agrochemicals in the sugar-alcohol area, Santa Rita, State of Paraíba, Brazil
Fonte: Ciênc. Saúde Colet;24(12):4665-4676, dez. 2019. tab, graf.
Idioma: pt.
Resumo: Resumo O aumento da produtividade agrícola, em especial da produção canavieira, geralmente está associado ao uso de agrotóxicos. O risco de contaminação desses compostos nos recursos hídricos é uma preocupação para a saúde pública e ambiental. Nesse contexto, o estudo objetivou estimar o potencial de contaminação das águas subterrâneas e superficiais por agrotóxicos aplicados em uma área sucroalcooleira na região metropolitana de João Pessoa, município de Santa Rita/Paraíba. A análise foi realizada seguindo critérios propostos pela Environmental Protection Agency - EPA e índice de GUS (águas subterrâneas) e pelo método de GOSS (águas superficiais). Como resultados da estimativa de contaminação das águas subterrâneas, observou-se que dos 25 princípios ativos avaliados pelos métodos (EPA e GUS), 52% apresentaram tendência de contaminação potencial. Quanto ao risco de contaminação das águas superficiais, a maioria dos princípios ativos possuía uma maior tendência de transporte de suas moléculas dissolvidas em água e transportadas por meio do carreamento das águas da chuva. Assim, pode-se concluir que há a necessidade de implantação de programas de monitoramento ambiental e de medidas voltadas à proteção da saúde pública.

Abstract The increase in agricultural productivity, especially sugarcane production, is generally associated with the use of agrochemicals. The risk of contamination of these compounds in water resources is a concern for public and environmental health. In this context, the scope of this study was to estimate the contamination potential of the groundwater and surface water by agrochemicals applied in a sugar and alcohol area in the metropolitan region of João Pessoa, Santa Rita/Paraíba. Analysis was performed according to the criteria proposed by the EPA (Environmental Protection Agency), namely the GUS index (Groundwater Ubiquity Score) and the GOSS method (surface water). As a result of the estimate of groundwater contamination, it was observed that 52% out of 25 active compounds evaluated by the methods (EPA and GUS), showed a tendency of potential contamination. With respect to the contamination of surface waters, most of the active principles had a greater tendency to transport their molecules dissolved in water and transported them through rainwater. Thus, the conclusion drawn is that there is a need for the implementation of environmental monitoring programs and measures aimed at the protection of public health.
Descritores: Poluentes Químicos da Água/análise
Poluição Química da Água/análise
Água Subterrânea/química
Agroquímicos/análise
Produtos Agrícolas
-Brasil
Saccharum
Responsável: BR1.1 - BIREME


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Id: biblio-1052269
Autor: Feng, Shoushuai; Hou, Shaoxiang; Huang, Xing; Fang, Zheng; Tong, Yanjun; Yang, Hailin.
Título: Insights into the microbial community structure of anaerobic digestion of municipal solid waste landfill leachate for methane production by adaptive thermophilic granular sludge
Fonte: Electron. j. biotechnol;39:98-106, may. 2019. tab, graf, ilus.
Idioma: en.
Projeto: National Natural Science Foundation of China; . Social Development Projects of Jiangsu Province; . Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education; . Key Laboratory of Industrial Biotechnology, Ministry of Education; . Priority Academic Program Development of; . Jiangsu Higher Education Institutions, and Program of Introducing; . Talents of Discipline to Universities.
Resumo: BACKGROUND: The amount of municipal solid waste (MSW) gradually increased along with the rapid development of modern cities. A large amount of landfill leachate are generated with excessive chemical oxygen demand (COD), which create a great deal of pressure on the environment-friendly treatment process. Anaerobic digestion is an ideal technique to solve the above problem. RESULTS: A thermophilic granular sludge was successfully adapted for anaerobic digestion of MSW leachate (from an aging large-scale landfill) for methane production. The COD degradation efficiency improved by 81.8%, while the methane production rate reached 117.3 mL CH4/(g VS d), which was 2.34-fold more than the control condition. The bacterial and archaeal communities involved in the process were revealed by 16S rRNA gene high-throughput pyrosequencing. The richness of the bacterial community decreased in the process of thermophilic granular sludge, while the archaeal community structure presented a reverse phenomenon. The bacterial genus, Methanosaeta was the most abundant during the mesophilic process, while Methanobacterium, Methanoculleus, Methanosaeta and Methanosarcina were more evenly distributed. The more balanced community distribution between hydrogenotrophic and acetotrophic methanogens implied a closer interaction between the microbes, which further contributed to higher methane productivity. The detailed relationship between the key functional communities and anaerobic digestion performances were demonstrated via the multivariate canonical correspondence analysis. Conclusions: With the assistance of adaptive thermophilic granular sludge, microbial community structure was more evenly distributed, while both of COD degradation rate and methane production was improved during anaerobic digestion of MSW landfill leachate.
Descritores: Bactérias Anaeróbias/metabolismo
Resíduos Sólidos
Digestão Anaeróbia
Tratamento de Lodos
Metano/metabolismo
-Esgotos/microbiologia
Bactérias Anaeróbias/isolamento & purificação
Poluentes Químicos da Água
Reação em Cadeia da Polimerase
Área Urbana
Biocombustíveis
Análise da Demanda Biológica de Oxigênio
Temperatura Alta
Anaerobiose
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-915128
Autor: Omidpanah, Sahar; Saeidnia, Soodabeh; Saeedi, Mina; Hadjiakhondi, Abbas; Manayi, Azadeh.
Título: Phthalate contamination of some plants and herbal products / Contaminación de algunas plantas y productos herbales con ftalatos
Fonte: Bol. latinoam. Caribe plantas med. aromát;17(1):61-67, ene. 2018. tab.
Idioma: en.
Projeto: Iran National Science Foundation.
Resumo: Phthalate derivatives cause a number of risks to human health and the environment. Essential oil and volatile fractions of some vegetables and herbal products were extracted by hydrodistillation and percolation methods to analyze using gas chromatography and mass spectrometry (GC-MS) for evaluation of phthalate contaminations. The results revealed that four vegetables and all aromatic waters were contaminated by phthalate derivatives including di-n-butyl phthalate (DBP), diisobutyl phthalate and di-(2-ethylhexyl) phthalate (DEHP) (0.1-7.95%). Butylated hydroxytoluene (BHT), a widely used synthetic antioxidant, was also found in the most of the aromatic waters in the range of 3.15-61.3%. In addition, three vegetable samples contained diazinon (0.36-4.61%), an organophosphorus insecticide. Plants and herbal preparations may be contaminated by the absorption of phthalates from contaminated water or soil or by the migration of phthalates from inexpensive recycled plastic. Regarding the widespread use and associated health risks of phthalates, effective quality and safety regulations for herbal products should be implemented with respect to their phthalate content.

Los derivados de ftalato causan una serie de riesgos para la salud humana y el medio ambiente. El aceite esencial y las fracciones volátiles de algunos vegetales y productos a base de hierbas fueron extraídos mediante hidrodestilación y métodos de percolación y luego fueron analizados mediante cromatografía de gases y espectrometría de masas (GC-MS) con el propósito de identificar contaminación con ftalatos. Los resultados revelaron que cuatro productos herbales y todas las aguas aromáticas analizadas estaban contaminadas con derivados de ftalato, incluyendo el ftalato de dibutulo (DBP), ftalato de diisobutilo y ftalato de bis(2-etilhexilo) (DEHP) (0.1-7.95%). El butilhidroxitolueno (BHT), un antioxidante sintético ampliamente utilizado, también se encontró en aguas aromáticas en el rango de 3.15- 61.3%. Además, tres muestras vegetales contenían diazinón (0.36-4.61%), un insecticida organofosforado. Las plantas y las preparaciones herbales pueden ser contaminadas a partir de absorción de ftalatos del agua o el suelo contaminados o por la migración de ftalatos desde plástico reciclado de bajo costo. Con respecto al uso generalizado y los riesgos asociados a la salud de los ftalatos, deben implementarse normas efectivas de calidad y seguridad para los productos a base de hierbas con respecto a su contenido de ftalato.
Descritores: Ácidos Ftálicos/análise
Poluentes Químicos da Água/análise
Óleos Voláteis/química
Preparações de Plantas/química
-Cromatografia Gasosa-Espectrometria de Massas
Responsável: CL1.1 - Biblioteca Central


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Id: lil-583080
Autor: Casarini, Luiz Miguel; Henriques, Marcelo Barbosa; Lopes, Roberto Graça; Souza, Marcelo Ricardo.
Título: Chemical and bacteriological evaluation of the water and mussels from Santos bay, São Paulo, Brazil
Fonte: Rev. Inst. Adolfo Lutz;69(3):297-303, jul.-set. 2010. ilus, mapas, graf, tab.
Idioma: en.
Resumo: The sea water and Perna perna mussels samples were bimonthly collected from Santos bay from December 2006 to April 2008, and the occurrence of heavy metals, organic compounds and bacteria were investigated. Water and mussel meat quality were assessed following the Brazilian legislation. The analyses on heavy metals mercury, lead, zinc and cadmium contents were performed using atomic absorption spectrometry.The mussel meat was investigated by analytical methodologies following the international recommendations. Among the analyzed sea water samples, at least one sample showed chlorine, phosphorus, sulfide, total fluoride, ammoniac nitrogen, aluminum, lead and iron contents out of the established limits. In one mussel meat sample only a high peak of zinc concentration was found. The bacteriological agents found in water and mussel meat samples were sporadically above the recommended values.

Amostras de água do mar e de mexilhão Perna perna, coletadas bimestralmente da baía de Santos, no período de dezembro de 2006 a abril de 2008, foram analisadas quanto à presença de metais pesados, compostos orgânicos e bactérias. A qualidade da água e da carne de mexilhão foi avaliada seguindo-se a legislação brasileira. As análises dos metais pesados mercúrio, chumbo, zinco e cádmio foram realizadas pela técnica de espectrometria de absorção atômica. As amostras de carne de mexilhão foram analisadas de acordo com as recomendações internacionais. Entre as amostras de água do mar, pelo menos uma apresentou teor de o cloro, fósforo, sulfeto, fluoreto total, nitrogênio amoniacal, alumínio, chumbo e ferro fora dos limites estabelecidos. Apenas uma amostra de carne do mexilhão apresentou pico elevado de concentração de zinco. Os agentes bacteriológicos analisados nas amostras de água e de carne estavam esporadicamente acima dos valores recomendados.
Descritores: Perna (Organismo)
Bivalves
Metais Pesados
Poluentes Químicos da Água
Responsável: BR91.2 - Centro de Documentação


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Id: lil-769577
Autor: Souza-Araujo, J.; Giarrizzo, T.; Lima, MO..
Título: Mercury concentration in different tissues of Podocnemis unifilis (Troschel, 1848) (Podocnemididae: Testudines) from the lower Xingu River – Amazonian, Brazil / Concentrações de mercúrio em diferentes tecidos de Podocnemis unifilis (Podocnemididae: Testudines) do baixo Rio Xingu – Amazônia, Brasil
Fonte: Braz. j. biol;75(3s1):106-111, Aug. 2015. tab, graf.
Idioma: en.
Projeto: CNPq.
Resumo: Abstract Studies using chelonians as biosentinels of environment quality or health risks associated with turtle consumption are very rare, especially in the Amazon basin. This study aims to measure Mercury levels (Hg) in muscle, liver, fat and blood of Podocnemis unifilis from the lower Xingu River, assessing the possible difference in concentration between sexes and also evaluating the potential bioaccumulation along different body sizes. Samples were collected during the dry season (October 2012) and Mercury (Hg) concentrations were analysed by Cold Vapor Atomic Absorption Spectrometry (CVAAS). A total of 29 specimens of P. unifilis of different sizes showed low levels lower than 0.2 mg/Kg). Higher Hg concentrations were found in the liver, and significant correlations between Hg concentrations in the different tissues were also detected. There was no difference between males and females and a negative correlation was found between Hg concentration and body size.

Resumo Estudos utilizando quelônios como biosentinelas de qualidade ambiental ou de riscos à saúde associados ao consumo de tartarugas são raros, especialmente na bacia amazônica. Neste estudo foram medidos os níveis de mercúrio no músculo, fígado, gordura e sangue de Podocnemis unifilis do baixo Rio Xingu. Foram avaliadas as possíveis diferenças de concentração entre os sexos e também o potencial de bioacumulação ao longo de diferentes tamanhos corporais. A etapa de amostragem ocorreu durante o período seco (Outubro de 2012) e a quantificação de Mercúrio (Hg) foi realizada através de digestão ácida e análises por Espectrometria de Absorção Atômica com Vapor Frio (CVAAS). Um total de 29 amostras de Podocnemis unifilis, mesmo em diferentes tamanhos, mostraram concentrações de Hg menores que 0,2 mg/kg. As concentrações mais elevadas de Hg foram encontradas no fígado, e também foram detectadas correlações significativas entre as concentrações de Hg nos tecidos. Não foram observadas diferenças significativas entre machos e fêmeas, sendo registrada correlação negativa entre a concentração de Hg e o tamanho do corpo.
Descritores: Mercúrio/metabolismo
Tartarugas/metabolismo
Poluentes Químicos da Água/metabolismo
-Tamanho Corporal
Brasil
Rios
Estações do Ano
Distribuição Tecidual
Limites: Animais
Feminino
Masculino
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



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