Urine-powered microbial fuel cell using a hyperpiliated pilT mutant of Pseudomonas aeruginosa
Devesh Dadhich Shreeram, Daniel J Hassett, Dale W Schaefer
AI summary
70% confidenceA genetically engineered Pseudomonas aeruginosa strain with reduced twitching motility and hyperpiliation shows a 2.7-fold increase in peak power density compared to the wild-type strain in a urine-powered microbial fuel cell.
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Abstract
Abstract This report documents the first observation of a urine-powered microbial fuel cell operating with a genetically engineered bacterial strain. Under identical conditions, a pilT mutant of the Gram-negative bacterium Pseudomonas aeruginosa showed a 2.7-fold increase in peak power density compared to the wild-type strain, PAO1. The reduced twitching motility and hyperpiliation of the pilT mutant enhances the formation of electrogenic biofilms. For both strains, the observed high internal resistance near open-circuit voltage is attributed to sluggish redox reactions on the anode surface and not to slow bacterial metabolism. This work lays the groundwork for optimization of multiple bacterial traits leading to increased electroactive properties and opens new opportunities for urine-based mini-devices.
Key findings
- The pilT mutant of Pseudomonas aeruginosa exhibits enhanced formation of electrogenic biofilms.
- High internal resistance near open-circuit voltage is attributed to sluggish redox reactions on the anode surface.
- The pilT mutant shows a 2.7-fold increase in peak power density compared to the wild-type strain PAO1.
Keywords
Identifiers
- Journal
- Journal of Industrial Microbiology and Biotechnology
- Year
- 2015