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Related Concept Videos

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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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Pseudomonas aeruginosa and Saccharomyces cerevisiae Biofilm in Flow Cells
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Understanding the flow behavior around marine biofilms.

Maria J Romeu1,2, João M Miranda3,2, Ed D de Jong4

  • 1LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.

Biofilm
|July 1, 2024
PubMed
Summary

Mature marine biofilms significantly alter fluid flow, creating varied shear forces. This heterogeneity in shear stress within biofilms may explain differences in cell behavior and resistance.

Keywords:
Biofilm structural parametersBiofilmsCFD modellingHydrodynamic conditionsMarine biofoulingOCTShear forces

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Area of Science:

  • Marine microbiology
  • Biophysics
  • Fluid dynamics

Background:

  • In vitro platforms mimic aquatic environments to study biofilm formation and fouling.
  • Computational Fluid Dynamics (CFD) models initial shear forces on adhering organisms.
  • Understanding mature biofilm-flow interactions is crucial for predicting fouling and microbial behavior.

Purpose of the Study:

  • To investigate flow behavior and shear rate distribution in mature marine biofilms.
  • To analyze how biofilm architecture influences local hydrodynamics.
  • To determine the impact of varying hydrodynamic conditions on biofilm development.

Main Methods:

  • Utilized Optical Coherence Tomography (OCT) for 3D biofilm imaging.
  • Generated computational meshes from OCT data for CFD simulations.
  • Cultured marine cyanobacteria biofilms in agitated microtiter plates for 7 weeks at different shaking frequencies.

Main Results:

  • Shaking frequencies influenced biofilm architecture, which in turn affected local hydrodynamics.
  • Biofilm architecture created significant heterogeneity in the shear rate field.
  • Cells in biofilm streamers experienced higher shear forces, especially at lower bulk flow velocities.

Conclusions:

  • Mature marine biofilms exhibit complex flow dynamics and heterogeneous shear stress distribution.
  • This shear force heterogeneity may drive variations in biofilm cell physiology, growth, and resistance.
  • The study advances understanding of biofilm-flow interactions beyond initial attachment stages.