SciELO - Scientific Electronic Library Online

 
vol.27 número3Termodegradación de resinas agotadas de intercambio iónico de lecho mixtoBiorremediación de suelo contaminado con hidrocarburos empleando lodos residuales como fuente alterna de nutrientes índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • No hay artículos similaresSimilares en SciELO

Compartir


Revista internacional de contaminación ambiental

versión impresa ISSN 0188-4999

Resumen

ISLAS-ESPINOZA, Marina  y  BOJORQUEZ-AGUILAR, Rocío. Cr+6 reducing bacteria and its biotechnological potencial. Rev. Int. Contam. Ambient [online]. 2011, vol.27, n.3, pp.231-239. ISSN 0188-4999.

Bacteria that survive the pollutant mixing conditions of the upper basin of the Lerma river (CARL) require a specialized metabolism for survival. Under this postulation, sediment was taken from three sites of the CARL as a source of bacteria resistant to Cr+6. At the site identified as Lerma, greater variability of species was found in the group of selected bacteria that reduced Cr+6. In Tultepec, the highest population of Cr+6 reducing bacteria was isolated. Six strains with different morphological and biochemical characteristics were isolated from the sediments. These strains tolerated concentrations up to 1000 mg L-1 of Cr+6 in liquid media. Also they reduced Cr+6 to Cr+3 in percentages between 7 and 40, following 7 days, supplemented with 200 mg L-1 of Cr+6. The strains studied were Gram negative and showed a minimum inhibitory concentration greater than that found in other studies. The transformation capacity of each strain in descending order were: F, A, B, C, E and D. The kinetics of reduction of strain F showed the highest transformation of Cr+6 to Cr+3, obtaining a reduction of 33.59 % at 12 days. The biomass of strain F was not affected by the presence of Cr+6. It is important to note that the medium itself represented a reduction of Cr+6 (17.21 %). The use of the API-20E kit was helpful in determining some biochemical reactions of strains, however, this identification was not conclusive because it presented low percentages of similarity (83.1 to 90.7 %). These strains represent a potential of biotechnology for use in treatment systems to reduce Cr+6 to Cr+3, and even in trials of other heavy metals.

Palabras llave : resistant bacteria; Cr+6; isolation; Cr+6-reduction; contaminated water body.

        · resumen en Español     · texto en Español     · Español ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons