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Ítem Heavy metals species affect fungal-bacterial synergism during the bioremediation of fluoranthene(Springer Verlag, 2016-08-01) Ma, XiaokuiThe co-occurrence of polycyclic aromatic hydrocarbons (PAHs) with heavy metals (HMs) is very common in contaminated soils, but the influence of HMs on fungal-bacterial synergism during PAH bioremediation has not been investigated. The bioremediation of fluoranthene-contaminated sand using co-cultures of Acremonium sp. P0997 and Bacillus subtilis showed increases of 109.4 and 9.8 % in degradation compared to pure bacterial and fungal cultures, respectively, removing 64.1 ± 1.4 % fluoanthene in total. The presence of Cu2+ reduced fluoranthene removal to 53.7 ± 1.7 %, while inhibiting bacterial growth, and reducing translocation of bacteria on fungal hyphae by 49.5 %, in terms of the bacterial translocation ratio. Cu2+ reduced bacterial diffusion by 46.8 and 31.9 %, as reflected by D (a bulk random motility diffusional coefficient) and Deff (the effective one-dimensional diffusion coefficient) compared to the control without HM supplementation, respectively. However, Mn2+ resulted in a 78.2 ± 1.9 % fluoranthene degradation, representing an increase of 21.9 %, while enhancing bacterial growth and bacterial translocation on fungal hyphae, showing a 12.0 % increase in translocation ratio, with no observable impact on D and Deff. Hence, the presence of HMs has been shown to affect fungal-bacterial synergism in PAH degradation, and this effect differs with HM species. © 2016, Springer-Verlag Berlin Heidelberg.Ítem Determinación de la acumulación de los metales pesados plomo, cadmio y cromo en la planta pistia stratiotes conocida como lechuga de agua(Universidad Icesi, 2015-07-01) Aguayo Girón, Carolina; Panay Escobar, Aram Joel; Asesor TesisPese a que Colombia es uno de los países con mayor oferta hídrica en el mundo, se calcula, según el Ministerio del Medio Ambiente, que la mitad de los recursos hídricos tienen problemas de calidad. Entre los componentes que disminuyen la calidad del agua, se encuentran contaminantes como los metales pesados. Una posible alternativa para mejorar la calidad del agua es la fitorremediación. La planta invasora Pistia stratiotes causa daños al sistema acuático en el que se encuentre, ya que evita el paso de luz y oxígeno. En este trabajo se logró determinar acumulación de metales pesados; Cromo, Cadmio y Plomo en Pistia stratiotes