Results: 20

Avaliação do crescimento de micro-organismos fotossintetizantes em fotobiorreator tubular empregando nutrientes provenientes da vinhaça tratada

vinhaça é resultante da produção de álcool, após a fermentação do mosto e destilação do vinho. É um resíduo rico em nutrientes, principalmente matéria orgânica, nitrogênio, fósforo e potássio. Para ser despejado em rios e lagos, esse efluente deve passar por tratamentos para remoção de...

Genotoxicity effects on Geophagus brasiliensis fish exposed to Doce River water after the environmental disaster in the city of Mariana, MG, Brazil

Braz. j. biol; 79 (4), 2019
Abstract The Doce River basin has suffered the largest environmental accident ever occurred in Brazil with the influx of tailings from Fundão and Santarém, belonging to Samarco mining company, due to the disaster in Mariana. A spill between 50 and 60 million m3 of tailings was estimated by the company...

Ecotoxicological risk assessment due to the presence of bisphenol A and caffeine in surface waters in the Sinos River Basin - Rio Grande do Sul - Brazil

Braz. j. biol; 79 (4), 2019
Abstract Bisphenol A (BPA) is an emerging contaminant, regularly detected in aquatic ecosystems, considered as an endocrine disrupting compound (EDC). Caffeine is another chemical related to human activity, often found in surface waters. The objective of this study was to evaluate the ecotoxicological r...

Feeding preference of the shredder Phylloicus sp. for plant leaves of Chrysophyllum oliviforme or Miconia chartacea after conditioning in streams from different biomes

Braz. j. biol; 79 (1), 2019
Abstract Macroinvertebrate shredders consume preferably leaves conditioned by fungi and bacteria which offer greater palatability to them. Plant species in Cerrado present high concentration of chemical elements such as lignin and cellulose, phenols and tanins thus making them less attractive for shredd...

Bioflocculant production from Streptomyces platensis and its potential for river and waste water treatment

Braz. j. microbiol; 49 (4), 2018
ABSTRACT A bacterium isolated from Sterkfontein dam was confirmed to produce bioflocculant with excellent flocculation activity. The 16S rDNA nucleotide sequence analyses revealed the bacteria to have 99% similarity to Streptomyces platensis strain HBUM174787 and the sequence was deposited in the Genbank...

Evaluación de la remoción de arsénico en agua superficial utilizando filtros domiciliarios

RESUMEN El objetivo del estudio fue evaluar filtros domiciliarios para remover arsénico presente en agua proveniente del río Sama. El sistema estuvo compuesto de un filtro tradicional de arena y un filtro con el material adsorbente de hierro cerovalente estabilizado en quitosano. La evaluación del sis...

Effect of watershed land use on water quality: a case study in Córrego da Olaria Basin, São Paulo State, Brazil

Braz. j. biol; 78 (4), 2018
Abstract The water quality is related to the hydrologic and limnologic properties of ground and surface water, and significant efforts have been made to monitor water sources to understand the effects of land use changes in agricultural areas, with significant socioeconomic activities. The objective of t...

Protocolo de avaliação da probabilidade de uso recreativo de rios e sua aplicação para análise de risco

Resumo Águas contaminadas representam um risco à saúde não somente pelo consumo direto, mas também pelo uso recreativo. Estratégias de análise de risco visam à redução dos casos de contaminação e devem incorporar as percepções e aceitação das pessoas em assumir riscos. Um método rápido ...

Assessing the spatial pattern of a river water quality in southern Brazil by multivariate analysis of biological and chemical indicators

Braz. j. biol; 77 (1), 2017
Abstract This study assessed the genotoxicity and chemical quality of the Rio dos Sinos, southern Brazil. During two years, bimonthly, cuttings of Tradescantia pallida var. purpurea with flower buds were exposed to river water samples from Caraá, Santo Antônio da Patrulha, Taquara and Campo Bom, which ...

La descomposición de la hojarasca como herramienta para evaluar la integridad funcional de ríos altoandinos del sur del Ecuador

Rev. biol. trop; 65 (1), 2017
ResumenLas condiciones ecológicas de los ríos altoandinos tropicales estan amenazadas por numerosas actividades humanas que incluyen aquellas derivadas del cambio de la cobertura y uso del suelo de la cuenca. Para su evaluación se han propuesto protocolos que diagnostican el estado de la estructura pe...