title: Biochemical capacitance of Geobacter sulfurreducens biofilms.
abstract: An electrical model able to decouple the electron pathway from microbial cell machinery impedance terms is introduced. In this context, capacitance characteristics of the biofilm are clearly resolved. In other words, the model allows separating, according to the advantage of frequency and spectroscopic response approach, the different terms controlling the performance of the microbial biofilm respiratory process and thus the directly related electricity production process. The model can be accurately fitted to voltammetry measurements obtained under steady-state conditions and also to biofilm discharge amperometric measurements. The implications of biological aspects of the electrochemical or redox capacitance are discussed theoretically in the context of current knowledge with regard to structure and physiological activity of microbial Geobacter biofilms.
authors.affiliation: Institute of Chemistry, Physical Chemistry Department, Univ. Estadual Paulista (São Paulo State University, UNESP), Nanobionics group CP 355, 14800-900, Araraquara, São Paulo (Brazil), Fax: (+55) 16-3322-2308 www.nanobionics.pro.br. prbueno@iq.unesp.br.
authors.forename: Paulo R
authors.initials: PR
authors.lastname: Bueno
authors.affiliation: Laboratorio de Bioelectroquímica, División Electroquímica y Corrosión, INTEMA-CONICET-UNMdP, Juan B. Justo 4302, B7608FDQ, Mar del Plata (Argentina).
authors.forename: Germán D
authors.initials: GD
authors.lastname: Schrott
authors.affiliation: Laboratorio de Bioelectroquímica, División Electroquímica y Corrosión, INTEMA-CONICET-UNMdP, Juan B. Justo 4302, B7608FDQ, Mar del Plata (Argentina).
authors.forename: Pablo S
authors.initials: PS
authors.lastname: Bonanni
authors.affiliation: Laboratorio de Bioelectroquímica, División Electroquímica y Corrosión, INTEMA-CONICET-UNMdP, Juan B. Justo 4302, B7608FDQ, Mar del Plata (Argentina).
authors.forename: Silvia N
authors.initials: SN
authors.lastname: Simison
authors.affiliation: Laboratorio de Bioelectroquímica, División Electroquímica y Corrosión, INTEMA-CONICET-UNMdP, Juan B. Justo 4302, B7608FDQ, Mar del Plata (Argentina).
authors.forename: Juan P
authors.initials: JP
authors.lastname: Busalmen
mesh_terms: D001674:Bioelectric Energy Sources; D018441:Biofilms; D025802:Electric Capacitance; D004566:Electrodes; D045302:Geobacter / Q000502:physiology*
keywords: biofilms; capacitance; microbial respiration; spectroscopy; thermodynamics