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Adsorption and affinity of Escherichia coli to different aggregate sizes of a silty clay soil

Colaborador(es): Behrends Kraemer, Filipe. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Ingeniería Agrícola y Uso de la Tierra. Cátedra de Manejo y Conservación de Suelos. Buenos Aires, Argentina | Chagas, Celio Ignacio. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Ingeniería Agrícola y Uso de la Tierra. Cátedra de Manejo y Conservación de Suelos. Buenos Aires, Argentina | Cosentino, Diego Julián. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Cátedra de Edafología. Buenos Aires, Argentina | Garibaldi, Lucas Alejandro. Universidad Nacional de Río Negro. Sede Andina, Bariloche, Argentina. CONICET - Patagonia Norte. Bariloche, Argentina.
ISSN: 1001-6279.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): BIOLOGICAL CONTAMINATION | SURFACE TRANSPORT | WATER QUALITY | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: International Journal of Sediment Research vol.28, no.4,(2013), p.535-543, grafs., tbls.Resumen: The sediments produced by water erosion are the main source of pollution of agricultural origin of surface water bodies. These sediments may be associated to bacteria, compromising the quality of nearby water bodies. Therefore, to understand this biological contamination, it is necessary to find out the adsorption capacity and bacterial affinity to aggregate sizes that may result in a differential sedimentation. To this end, in the present work, the distribution, adsorption capacity and affinity to different aggregate sizes of two strains of Escherichia coli in minor sign two liquid media of contrasting ionic strength were evaluated in a silty clay soil. The minor sign 2 µm fraction showed a higher proportion of bacteria than the other aggregate sizes (48 per cent), whereas among the fractionsmayor sign 2 µm, the 20–50 µm fraction was the one that showed the highest bacterial adsorption in both liquid media (37.9 per cent). On the other hand, the highest values of bacterial affinity were found in the 20 to 50 µm fraction (coarse silt) in the low ionic strength media and 20–50 and mayor sign 50 µm in the high ionic strength media. However, the bacterial strains used revealed only some trends in the modification of these variables. This work contributes to the development and implementation of strategies to mitigate pollution, such as control of sediment generation and its subsequent capture in filter strips.
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The sediments produced by water erosion are the main source of pollution of agricultural origin of surface water bodies.
These sediments may be associated to bacteria, compromising the quality of nearby water bodies.
Therefore, to understand this biological contamination, it is necessary to find out the adsorption capacity and bacterial affinity to aggregate sizes that may result in a differential sedimentation.
To this end, in the present work, the distribution, adsorption capacity and affinity to different aggregate sizes of two strains of Escherichia coli in minor sign two liquid media of contrasting ionic strength were evaluated in a silty clay soil.
The minor sign 2 µm fraction showed a higher proportion of bacteria than the other aggregate sizes (48 per cent), whereas among the fractionsmayor sign 2 µm, the 20–50 µm fraction was the one that showed the highest bacterial adsorption in both liquid media (37.9 per cent).
On the other hand, the highest values of bacterial affinity were found in the 20 to 50 µm fraction (coarse silt) in the low ionic strength media and 20–50 and mayor sign 50 µm in the high ionic strength media.
However, the bacterial strains used revealed only some trends in the modification of these variables.
This work contributes to the development and implementation of strategies to mitigate pollution, such as control of sediment generation and its subsequent capture in filter strips.

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