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Redox Conductivity of Current-Producing Mixed Species Biofilms

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https://ir.library.oregonstate.edu/concern/articles/dr26z0119

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  • While most biological materials are insulating in nature, efficient extracellular electron transfer is a critical property of biofilms associated with microbial electrochemical systems and several microorganisms are capable of establishing conductive aggregates and biofilms. Though construction of these conductive microbial networks is an intriguing and important phenomenon in both natural and engineered systems, few studies have been published related to conductive biofilms/aggregates and their conduction mechanisms, especially in mixed-species environments. In the present study, current-producing mixed species biofilms exhibited high conductivity across non-conductive gaps. Biofilm growth observed on the inactive electrode contributed to overall power outputs, suggesting that an electrical connection was established throughout the biofilm assembly. Electrochemical gating analysis of the biofilms over a range of potentials (-600–200 mV, vs. Ag/AgCl) resulted in a peak-manner response with maximum conductance of 3437 ± 271 μS at a gate potential of -360 mV. Following removal of the electron donor (acetate), a 96.6% decrease in peak conductivity was observed. Differential responses observed in the absence of an electron donor and over varying potentials suggest a redox driven conductivity mechanism in mixed-species biofilms. These results demonstrated significant differences in biofilm development and conductivity compared to previous studies using pure cultures.
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  • Li, C., Lesnik, K. L., Fan, Y., & Liu, H. (2016). Redox Conductivity of Current-Producing Mixed Species Biofilms. PLoS ONE, 11(5), e0155247. doi:10.1371/journal.pone.0155247
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  • 11
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  • 5
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  • This publication was made possible by grant CBET 0955124 and PFI 1312301 from the U.S. National Science Foundation and in part by grant 1S10RR107903-01 from the National Institutes of Health.
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