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Related Concept Videos

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Introducing Shear Stress in the Study of Bacterial Adhesion
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Does Bacterial Elasticity Affect Adhesion to Polymer Fibers?

Laura Tamayo1, Francisco Melo2,3, Leonardo Caballero2,3

  • 1Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras, Santiago 3425, Chile.

ACS Applied Materials & Interfaces
|March 3, 2020
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Summary

Bacterial adhesion to surfaces is influenced by bacterial stiffness, shape, and fiber topography. Lower stiffness and more contact points enhance bacterial adhesion, with fiber radius playing a complex role.

Keywords:
adhesionbacteriaelasticityfiberspolymer surfaces

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Area of Science:

  • Microbiology
  • Materials Science
  • Biophysics

Background:

  • Bacterial adhesion to surfaces is crucial in many biological and medical contexts.
  • Factors influencing bacterial adhesion, such as substrate topography and bacterial properties, are not fully understood.

Purpose of the Study:

  • To quantitatively investigate the roles of bacterial elasticity, shape, and substrate topography in bacterial adhesion.
  • To elucidate the relationship between bacterial properties and adhesion on fibrous substrates.

Main Methods:

  • Enumeration of bacterial populations (P. aeruginosa, B. subtilis, S. aureus) on electrospun polycaprolactone fibers of varying diameters.
  • Assessment of bacterial stiffness and bacteria-polymer surface adhesion energy using the colloidal probe technique.
  • Development of a theoretical model incorporating bacterial and fiber properties to predict adhesion.

Main Results:

  • Bacterial adhesion increases with lower bacterial stiffness and a higher number of contact points between bacteria and fibers.
  • The adhesive propensity of bacteria is non-trivially dependent on fiber radius due to random fiber arrangement.
  • A theoretical model successfully interprets observed bacterial populations based on stiffness and adhesion energy.

Conclusions:

  • Bacterial adhesion is governed by a complex interplay between bacterial mechanical properties (stiffness, shape) and substrate topography (fiber diameter and arrangement).
  • The developed model provides a quantitative framework for predicting bacterial adhesion on fibrous materials.
  • Findings offer insights into controlling bacterial colonization on material surfaces.