title: Urine-powered microbial fuel cell using a hyperpiliated pilT mutant of Pseudomonas aeruginosa.
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.
authors.affiliation: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA.
authors.forename: Devesh Dadhich
authors.initials: DD
authors.lastname: Shreeram
authors.affiliation: Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267-0524, USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Hassett
authors.affiliation: Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA. dale.schaefer@uc.edu.|Department of Biomedical, Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221-0012, USA. dale.schaefer@uc.edu.
authors.forename: Dale W
authors.initials: DW
authors.lastname: Schaefer
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms; D050505:Mutant Proteins / Q000235:genetics / Q000378:metabolism*; D010084:Oxidation-Reduction; D011550:Pseudomonas aeruginosa / Q000235:genetics* / Q000378:metabolism* / Q000502:physiology; D014556:Urine / Q000737:chemistry*
chemical_list: D001426:Bacterial Proteins; D050505:Mutant Proteins
keywords: Biofilms; Genetic engineering; Microbial fuel cell; Pseudomonas aeruginosa; Urine