BiofilmsMicroelectrodesIon-Selective ElectrodesMembrane PotentialsElectrochemistryColony Count, MicrobialPlanktonElectrophysiologyAction PotentialsMicrobial ViabilityPotassiumExtracellular SpacePseudomonas aeruginosaStaphylococcus epidermidisMicroscopy, Electron, ScanningFluorocarbon PolymersHydrogen-Ion ConcentrationElectrodes, ImplantedMicrochip Analytical ProceduresElectrochemical TechniquesBacterial AdhesionGlassElectrodesSodiumCandida albicansCulture Media