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Related Concept Videos

Biofilms01:29

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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In Situ Mapping of the Mechanical Properties of Biofilms by Particle-tracking Microrheology
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Using Exogenous Polymers to Engineer Biofilm Viscoelasticity.

Bikash Bhattarai1, Gordon F Christopher1

  • 1Department of Mechanical Engineering, Whitacre College of Engineering, Texas Tech University, Lubbock, Texas 794091035, United States.

ACS Applied Bio Materials
|October 29, 2025
PubMed
Summary
This summary is machine-generated.

Charged polymers can engineer biofilm viscoelasticity by stiffening the matrix. Polymer backbone stiffness and charge play key roles in this mechanical reinforcement, impacting biofilm applications.

Keywords:
Pseudomonas aeruginosabiofilm viscoelasticityhydrogelmicrorheologypolymerrheology

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Area of Science:

  • Microbiology
  • Materials Science
  • Biophysics

Background:

  • Biofilms are microbial communities encased in a self-produced matrix.
  • Biofilm viscoelasticity is critical in various applications, influencing their performance and behavior.
  • Controlling biofilm mechanical properties is essential for targeted applications.

Purpose of the Study:

  • To investigate the use of exogenous charged polymers for engineering biofilm viscoelasticity.
  • To determine the influence of polymer charge and molecular weight on biofilm mechanical properties.
  • To understand the mechanism by which polymers alter biofilm matrix rigidity.

Main Methods:

  • Culturing *Pseudomonas aeruginosa* biofilms in microfluidic channels with varying polymers.
  • Mechanical testing of biofilms using microrheology.
  • Comparing the viscoelastic properties of polymer-modified biofilms to controls.

Main Results:

  • Both anionic and cationic polymers significantly stiffened biofilms.
  • Neutral polymers had minimal effect on biofilm stiffness, highlighting the importance of charge.
  • Increased polymer molecular weight led to matrix disruption and reduced stiffness.
  • Polymer backbone stiffness was identified as a key factor in enhancing biofilm rigidity.

Conclusions:

  • Exogenous charged polymers effectively engineer biofilm viscoelasticity.
  • Polymer charge is crucial for incorporation into the biofilm matrix and subsequent stiffening.
  • Molecular weight influences the extent of matrix disruption and mechanical reinforcement.
  • Understanding these interactions allows for tailored biofilm properties in various applications.