Assignment 4
editOriginal - "Bacterial nanowires"
editImplications and potential applications
editBiologically it is unclear what is implied by the existence of bacterial nanowires. Nanowires may function as conduits for electron transport between different members of a microbial community.
Edit - "Bacterial nanowires"
edit*Note that the added section "Potential bioenergy uses" is intended to be separate from the present Implications and Potential Applications
Implications
editBiologically it is unclear what is implied by the existence of bacterial nanowires. Nanowires may function as conduits for electron transport between different members of a microbial community.
Potential bioenergy uses
editBacterial nanowires have been shown to enhance microbial fuel cells due to their relatively long-range electrical conductivity[1]. Nanofilament networks of Shewanella oneidensis[2] and G. sulfurreducens[3] are able to transport electrons along centimeter-scale distances, greater than other mechanisms of biological electron transfer. In particular, nanowires of G. sulfurreducens, due to their metallic-like conductivity, are able to yield electricity levels comparable to those of synthetic metallic nanostructures[4]. Coating bacterial nanowires with metal oxides also promotes electrical conductivity[5]. The efficacy of bacterial nanowires suggests potential applications for microbe-produced nanomaterials in bioelectronics as well as microbial fuel cells as renewable energy sources[6].
Assignment 5: Edit #2 - "Bacterial Nanowires"
editImplications and applications
editBioenergy uses in microbial fuel cells
editIn microbial fuel cells (MFCs), bacterial nanowires can generate electricity via extracellular electron transport to the MFC's anode [1]. Nanowire networks have been shown to enhance the electricity output of MFCs with efficient and long-range conductivity. In particular, pili of Geobacter sulfurreducens possess metallic-like conductivity, producing electricity at levels comparable to those of synthetic metallic nanostructures [4]. When bacterial strains are genetically manipulated to boost nanowire formation, higher electricity yields are generally observed [3]. Coating the nanowires with metal oxides further promotes electrical conductivity [5]. Additionally, these nanowires can transport electrons up to centimetre-scale distances [3]. Long-range electron transfer via pili networks allows viable cells that are not in direct contact with an anode to contribute to electron flow [7]. Thus, increased current production in MFCs is observed in thicker biofilms.
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- ^ a b Kodesia, A.; Ghosh, M.; Chatterjee, A. (September 5, 2017). "Development of Biofilm Nanowires and Electrode for Efficient Microbial Fuel Cells (MFCs)". Thapar University Digital Repository (TuDR).
- ^ El-Naggar, M.; Wanger, G.; Leung, K.M.; Yuzvinsky, T.D.; Southam, G.; Yang, J.; Lau, W.M.; Nealson, K.H.; Gorby, Y.A. (August 31, 2010). "Electrical transport along bacterial nanowires from Shewanella oneidensis MR-1". PNAS. 107 (42): 18127–18131. doi:10.1073/pnas.1004880107.
- ^ a b c Malvankar, N.S.; Lovley, D.R. (May 21, 2012). "Microbial Nanowires: A New Paradigm for Biological Electron Transfer and Bioelectronics". ChemSusChem. 5 (6): 1039–1046. doi:10.1002/cssc.201100733 – via Wiley Online Library.
- ^ a b Malvankar, N.S.; Vargas, M.; Nevin, K.P.; Franks, A.E.; Leang, C.; Kim, B.C.; Inoue, K. (August 7, 2011). "Tunable metallic-like conductivity in microbialnanowire networks". Nature Nanotechnology. 6: 573–579. doi:10.1038/NNANO.2011.119.
- ^ a b Maruthupandy, M.; Anand, M.; Maduraiveeran, G. (June 5, 2017). "Fabrication of CuO nanoparticles coated bacterial nanowire film for a high-performance electrochemical conductivity". J Mater Sci. 52: 10766–10778. doi:10.1007/s10853-017-1248-6.
- ^ Strycharz-Glaven, S.M.; Snider, R.M.; Guiseppi-Elie, A.; Tender, L.M. (August 26, 2011). "On the electrical conductivity of microbial nanowires and biofilms". Energy Environ. Sci. 4 (11): 4366–4379. doi:10.1039/C1EE01753E.
- ^ Reguera, Gemma (November 2006). "Biofilm and Nanowire Production Leads to Increased Current in Geobacter sulfurreducens Fuel Cells". Appl. Environ. Microbiol. 72: 7345–7348.