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(a) AFM topography image (contact mode in liquid) of the M. lysodeikticus and P. fluorescens on PLL-coated mica (the average height of the features is 500 nm; red-to-blue contrast scale bar is 1 μm); (b) amplitude of the single frequency PFM, (c) phase of single frequency PFM, (d) schematic representation of the waveforms used in single frequency PFM and in BE probing of the electromechanical coupling.
