Formation of Electrically Conductive Bacterial Nanowires by Desulfuromonas acetoxidans in Microbial Fuel Cell Reactor
A.N.Z. Alshehri
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Abstract
In this investigation on Anaerobic Sulfate Respiration Bacteria (ASRB), it is reported that the obligate anaerobic microorganism, Desulfuromonas acetoxidans are capable of producing nano scale bacterial appendages for facilitating extracellular electron transfer. The nanowires were resistive and electrically conductive (1.88 × 10⁻⁸ Ω•m and 7.32 S•m–1). They also permitted the ASRB to colonize the surface of the solid or insoluble electron acceptors, thereby making it possible for extracellular electron transfer to take place to the insoluble electrode in the MFC directly and without the need of mediators for electron shuttling. The maximum power density reached was 7.9 Wm-3, and nanowire production was stimulated whilst insoluble electron acceptors were present for cellular respiration to occur. The results suggest D. acetoxidans initiates the production of conductive nanowires in case of limited availability of a soluble electron acceptor (SO42-) for ASRB as an alternative means for facilitating electron transfer to the insoluble electron acceptors.
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- Journal
- International Journal of Current Microbiology and Applied Sciences
- Year
- 2017