Biochemical Capacitance of Geobacter Sulfurreducens Biofilms

PAULO R BUENO; GERMÁN DAVID SCHROTT; PABLO SEBASTIÁN BONANNI; SILVIA NOEMÍ SIMISON; JUAN PABLO BUSALMEN

CHEMSUSCHEM

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2015

1864-5631

An electrical model able to decouple the electron pathwayfrom microbial cell machinery impedance terms is introduced.In this context, capacitance characteristics of the biofilm areclearly 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 thusthe directly related electricity production process. The modelcan 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 arediscussed theoretically in the context of current knowledgewith regard to structure and physiological activity of microbialGeobacterbiofilms.