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Light-responsive current generation by phototrophically enriched anode biofilms dominated by green sulfur bacteria.
MedLine Citation:
PMID:  23124549     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The objective of this study was to employ microbial electrochemical cells (MXCs) to selectively enrich and examine anoxygenic photosynthetic bacteria for potential anaerobic respiration capabilities using electrodes. In the process, we designed a novel enrichment strategy that manipulated the poised anode potential, light, nitrogen availability, and media supply to promote growth of phototrophic bacteria while minimizing co-enrichment of non-phototrophic anode-respiring bacteria (ARB). This approach resulted in light-responsive electricity generation from fresh- and saltwater inocula. Under anoxic conditions, current showed a negative light response, suggesting that the enriched phototrophic consortia shifted between phototrophic and anaerobic respiratory metabolism. Molecular, physical, and electrochemical analyses elucidated that anode biofilms were dominated by green sulfur bacteria, and biofilms exhibited anode respiration kinetics indicative of non-mediated electron transfer, but kinetic parameters differed from values previously reported for non-phototrophic ARB. These results invite the utilization of MXCs as microbiological tools for exploring anaerobic respiratory capabilities among anoxygenic photosynthetic bacteria. Biotechnol. Bioeng. © 2012 Wiley Periodicals, Inc.
Authors:
Jonathan P Badalamenti; César I Torres; Rosa Krajmalnik-Brown
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-1
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  -     ISSN:  1097-0290     ISO Abbreviation:  Biotechnol. Bioeng.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Affiliation:
Swette Center for Environmental Biotechnology, The Biodesign Institute, Arizona State University, Tempe, AZ.
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