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Title: Response to mixed substrate feeds of the structure and activity of a linuron-degrading triple-species biofilm
Authors: Breugelmans, Philip ×
Horemans, Benjamin
Hofkens, Johan
Springael, Dirk #
Issue Date: 2010
Publisher: Elsevier
Series Title: Research in Microbiology vol:161 issue:8 pages:660-666
Abstract: We sought to determine whether the pesticide-degrading performance of a multi-species bacterial biofilm is affected by co-occurrence of multiple nutrient sources Thus, the 3-(3,4-dichlorophenyl)-l-methoxy-l-methyl urea (linuron)-degrading activity of a triple-species linuron-degrading consortium, cultivated in continuous flow biofilm systems, was monitored when exposed to mixed substrate feeds which contained, in addition to linuron, readily assimilated carbon (i e citrate and trypticase soy broth) and/or nitrogen (i e ammonium) sources The addition of alternative carbon sources at different concentrations resulted in diminished linuron degradation efficiency In addition, the efficiency of removal of the linuron metabolite 3,4-dichloroaniline was affected These effects might be attributed to catabolic repression of the linuron metabolic pathway in the presence of alternative carbon substrates Moreover, each nutrient condition resulted in a particular biofilm composition and a particular spatial and structural organization, which might also be related to the performance of the biofilm community Results show that the activity of pesticide-degrading biofilms strongly depends on prevailing nutrient conditions and that the ideal biofilm configuration and activity, as observed under selective conditions, does not exist in real-life environmental conditions where mixtures of substrates are often present (C) 2010 Elsevier Masson SAS All rights reserved.
URI: 
ISSN: 0923-2508
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Soil and Water Management
Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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