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Related Concept Videos

Biofilms01:29

Biofilms

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 Characterization of Shewanella oneidensis MR1 Biofilms by SALVI and ToF-SIMS
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Shearing of biofilms enables selective layer based microbial sampling and analysis.

Yang Lu1, Frances Slater, Ricardo Bello-Mendoza

  • 1Advanced Water Management Centre, The University of Queensland, Level 4, Gehrmann Laboratories Building (60), Brisbane, QLD 4072, Australia. y.lu@awmc.uq.edu.au

Biotechnology and Bioengineering
|April 26, 2013
PubMed
Summary

Researchers developed a new method to analyze microbial communities within anaerobic granules. This hydraulic shearing technique allows for selective removal of outer layers, revealing distinct microbial populations at different depths within the granules.

Keywords:
UASBanaerobic granulecryosection-FISHgranule layershear stress

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Area of Science:

  • Environmental microbiology
  • Anaerobic digestion systems
  • Biofilm research

Background:

  • Anaerobic granules are crucial for high-rate treatment systems, exhibiting complex internal structure.
  • Analyzing granule layering traditionally required destructive methods like sectioning or whole-granule analysis, limiting spatial resolution.
  • Existing techniques like fluorescent in situ hybridization (FISH) and bulk DNA sequencing have limitations in analyzing distinct spatial layers separately.

Purpose of the Study:

  • To develop and demonstrate a novel method for selectively removing microbial layers from anaerobic granules.
  • To analyze the spatial distribution of microbial communities within different types of anaerobic granules.
  • To overcome the limitations of existing methods for studying granule functional and phylogenetic layering.

Main Methods:

  • Selective removal of microbial layers from granules using hydraulic shearing.
  • Application of the method to VFA-, carbohydrate-, and protein-fed anaerobic granules (0.6-2 mm).
  • Confirmation of selective shearing using fluorescent in situ hybridization (FISH) and analysis of microbial communities using TRFLP (Terminal Restriction Fragment Length Polymorphism).

Main Results:

  • Successful selective shearing of outer granule layers was confirmed by FISH.
  • TRFLP analysis revealed a distinct shift in microbial populations from outer to inner layers.
  • Outer layers were dominated by presumptive acidogens (e.g., Bacteroidetes, Anaerolinea), while inner layers showed an increase in syntrophs (e.g., Syntrophomonas, Geobacter).

Conclusions:

  • Hydraulic shearing provides a non-destructive method to access and analyze successive spatial layers of anaerobic granules.
  • This shear-bulk molecular method enables deeper phylogenetic profiling compared to FISH, without prior community knowledge.
  • The findings demonstrate a clear depth-related stratification of microbial communities within anaerobic granules, crucial for understanding reactor functionality.