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• W854449228 abstract "The degradation of water resources, as the lentics environments, among them, the lakes, is a major concern now, because it can cause direct or indirect damages to health and to the survival of the exposed organisms. One factor that can contribute to change the water quality of lentics environments is the dumping of effluents, mainly those of domestic origin, carriers of substances that come to be toxic to the aquatic environment. Through the cytogenetic tests, using the most diverse systems-test, it is possible monitoring the extent of pollution and assess the effects of substances on the natural environment. To that end, this work has taken a model of study, an urban artificial lake (Lago Azul, Rio Claro-SP) and aimed to evaluate the cytotoxic, genotoxic and mutagenic potentials of waters that environment, through tests of chromosome aberrations and micronuclei in meristematic cells of Allium cepa (onion) in two treatments: the continued and the period of recovery, in ultra pure water, and by the micronucleus and nuclear abnormalities test and of the comet assay, applied in erythrocytes of Oreochromis niloticus (tilapia). Seasonal collections of waters were held in the dry season (august/2006 and august/2007) and the rainy season (march/2007 and february/2008). Physical and chemical analyses were made for a collection of each season. From the data obtained, it can be infered that the waters of this lentic environment had cytotoxic, genotoxic and mutagenic potentials in two seasons of collections for the two systems-test employed. Analyses of metals detected high concentrations of Ag, Cd, Cu, Fe, whose values are higher than permitted by law, in both seasons. Although the cytotoxic, genotoxic and mutagenic potentials have been detected in two seasons, the dry season is that presented the highest risk, because in this period, the tests showed high concentrations of metals Al and Hg. It was concluded that the results are arising from the influence of seasonality, since the rainy season there is a greater carried of cytotoxic substances by the waters of the rain, and in the dry season, a greater concentration of pollutants due to reduced of water content, resulting in greater interaction of elements present in the sediment to the water column. Key-words: micronuclei, chromosome aberrations, nuclear abnormalities and lentic environment." @default.
• W854449228 created "2016-06-24" @default.
• W854449228 creator A5084372229 @default.
• W854449228 date "2008-08-04" @default.
• W854449228 modified "2023-09-23" @default.
• W854449228 title "Avaliação dos potenciais citotóxico, genotóxico e mutagênico das águas de um ambiente lêntico, por meio dos sistemas-teste de Allium cepa e Oreochromis niloticus" @default.
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