Dynamic changes in the microbial community composition in microbial fuel cells fed with sucrose |
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Authors: | Nelli?J?Beecroft Feng?Zhao John?R?Varcoe Robert?C?T?Slade Alfred?E?Thumser Email author" target="_blank">Claudio?Avignone-RossaEmail author |
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Institution: | (1) Division of Microbial Sciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, GU2 7XH, UK;(2) Division of Biochemical Sciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, GU2 7XH, UK;(3) Division of Chemical Sciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, GU2 7XH, UK;(4) Present address: Institute of Urban Environment, CAS, Xiamen, 361021, China; |
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Abstract: | The performance and dynamics of the bacterial communities in the biofilm and suspended culture in the anode chamber of sucrose-fed
microbial fuel cells (MFCs) were studied by using denaturing gradient gel electrophoresis (DGGE) of PCR-amplified partial
16S rRNA genes followed by species identification by sequencing. The power density of MFCs was correlated to the relative
proportions of species obtained from DGGE analysis in order to detect bacterial species or taxonomic classes with important
functional role in electricity production. Although replicate MFCs showed similarity in performance, cluster analysis of DGGE
profiles revealed differences in the evolution of bacterial communities between replicate MFCs. No correlation was found between
the proportion trends of specific species and the enhancement of power output. However, in all MFCs, putative exoelectrogenic
denitrifiers and sulphate-reducers accounted for approximately 24% of the bacterial biofilm community at the end of the study.
Pareto–Lorenz evenness distribution curves extracted from the DGGE patterns obtained from time course samples indicated community
structures where shifts between functionally similar species occur, as observed within the predominant fermentative bacteria.
These results suggest the presence of functional redundancy within the anodic communities, a probable indication that stable
MFC performance can be maintained in changing environmental conditions. The capability of bacteria to adapt to electricity
generation might be present among a wide range of bacteria. |
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