Journal
BIOELECTROCHEMISTRY
Volume 119, Issue -, Pages 220-226Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2017.10.006
Keywords
Methanogenic biofilms; Electrical conductivity; In situ conductivity measurements
Funding
- U.S. National Science Foundation [CBET 0955124]
Ask authors/readers for more resources
Extracellular electron transfer between syntrophic partners needs to be efficiently maintained in methanogenic environments. Direct extracellular electron transfer via electrical current is an alternative to indirect hydrogen transfer but requires construction of conductive extracellular structures. Conductive mechanisms and relationship between conductivity and the community composition in mixed-species methanogenic biofilms are not well understood. The present study investigated conductive behaviors of methanogenic biofilms and examined the correlation between biofilm conductivity and community composition between different anaerobic biofilms enriched from the same inoculum. Highest conductivity observed in methanogenic biofilms was 71.8 +/- 4.0 mu S/cm. Peak-manner response of conductivity upon changes over a range of electrochemical potentials suggests that electron transfer in methanogenic biofilms occurs through redox driven super-exchange. The strong correlation observed between biofilm conductivity and Geobacter spp. in the metabolically diverse anaerobic communities suggests that the efficiency of DEEP may provide pressure for microbial communities to select for species that can produce electrical conduits. (C) 2017 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available