Journal
MICRON
Volume 85, Issue -, Pages 8-14Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micron.2016.03.002
Keywords
Atomic force microscopy; Force volume; Quantitative imaging; PeakForce quantitative nanomechanical mapping; Living bacterial cells; Elastic modulus
Categories
Funding
- Fondation pour la Recherche Medicale [ING21040129094]
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Structural and mechanical mapping at the nanoscale by novel high-speed multiparametric Quantitative Imaging (QI) and PeakForce Quantitative Nanomechanical Mapping (PF-QNM) AFM modes was compared to the classical Force Volume (FV) mapping for the case of living Pseudomonas aeruginosa bacterial cells. QI and PF-QNM modes give results consistent with FV for the whole cells in terms of morphology and elastic modulus, while providing higher resolution and shorter acquisition time. As an important complement, the influence of scanning parameters on elastic modulus values was explored for small 0.2(2) mu m(2) central area on top of cells. The modulus decreases with the indentation depth due to the effect of the hard cell wall, while it increases vs. tip oscillation frequency, displaying viscoelastic behaviour of the living bacterial cells. The ability of different AFM modes to follow correctly the bacteria viscoelastic behaviour at high oscillation frequency was tested. (C) 2016 Elsevier Ltd. All rights reserved.
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