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Bacterial Footprints in Elastic Pillared Microstructures.

Arturo Susarrey-Arce1, José Federico Hernández-Sánchez2, Marco Marcello3

  • 1Open Innovation Hub for Antimicrobial Surfaces at the Surface Science Research Centre and Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L69 3BX, United Kingdom.

ACS Applied Bio Materials
|January 8, 2022
PubMed
Summary
This summary is machine-generated.

Micropillared surfaces deform in response to bacterial suspensions. This mechanical response, driven by motile microbes with flagella, creates visible patterns, enabling microorganism detection.

Keywords:
bacteriabendingcapillarityelastic micropillarsresponsive substrates

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Area of Science:

  • Materials Science
  • Microbiology
  • Biophysics

Background:

  • Soft substrates with micropillar arrays exhibit deflection due to capillary action.
  • Micropillared epoxy surfaces can be sensitive to liquid droplet interactions.

Purpose of the Study:

  • To investigate the sensitivity of micropillared epoxy surfaces to bacterial suspensions.
  • To understand the mechanism behind micropillar deformation upon evaporation of bacterial droplets.

Main Methods:

  • Studying the deformation of micropillared epoxy surfaces exposed to single drops of bacterial suspensions.
  • Testing five bacterial strains: *S. epidermidis*, *L. sakei*, *P. aeruginosa*, *E. coli*, and *B. subtilis*.
  • Observing pillar deformation and aggregation patterns post-evaporation.

Main Results:

  • Micropillars deform significantly upon evaporation of bacterial suspensions.
  • Only motile bacteria with flagella induced micropillar bending and aggregation.
  • Characteristic patterns, including dimers, trimers, and clusters, formed on the surface.
  • Deformation patterns were visually identifiable by the naked eye.

Conclusions:

  • Micropillared surfaces are mechanically responsive to specific microbial characteristics (motility and flagella).
  • The observed phenomenon offers a potential method for detecting motile microorganisms.
  • Findings support the development of mechanically responsive substrates for microbial sensing.