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Cytochemical differences in bacterial glycocalyx.

Wolf Dietrich Krautgartner1, Ljubomir Vitkov, Matthias Hannig

  • 1Department of Electron Microscopy, Light Microscopy and Digital Image Acquisition, Institute of Zoology, University of Salzburg, Hellbrunnerstrasse 34, 5020 Salzburg, Austria.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
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Summary

This study visualizes bacterial adhesion using novel cytochemical methods. Cupromeronic blue staining with critical electrolytic concentrations successfully differentiated Staphylococcus aureus glycocalyx components.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Cell Biology

Background:

  • Bacterial adhesion is crucial for biofilm formation and pathogenesis.
  • Understanding the cytochemical properties of bacterial glycocalyx aids in differentiating species.
  • Previous methods have limitations in visualizing specific glycocalyx components.

Purpose of the Study:

  • To explore new cytochemical techniques for visualizing bacterial adhesion.
  • To differentiate the glycocalyx of Streptococcus sanguis and Staphylococcus aureus.
  • To investigate the use of cupromeronic blue (CB) staining with critical electrolytic concentrations (CECs) for bacterial glycocalyx visualization.

Main Methods:

  • Culturing Streptococcus sanguis and Staphylococcus aureus with and without sucrose.
  • Applying electron microscopy techniques including OsO4, UA, RR, CB staining with CECs, and TAMST.
  • Utilizing CB staining with CECs for visualizing bacterial glycoproteins and intracellular components.

Main Results:

  • Ruthenium red (RR)-positive fimbriae were visualized in S. sanguis.
  • Staphylococcus aureus exhibited RR-positive, OsO4-positive, tannophilic, and CB-positive fimbriae.
  • CB staining with CECs revealed intracellular CB-positive substances in S. aureus, likely monomeric subunits.
  • This method allowed for clear distinction between S. aureus and other bacteria lacking CB-positive substances.

Conclusions:

  • Cupromeronic blue staining with critical electrolytic concentrations is a novel method for visualizing bacterial glycocalyx glycoproteins.
  • This technique enables the visualization of intracellular components, aiding in species differentiation.
  • The study provides a partial cytochemical differentiation of bacterial glycocalyx, particularly for S. aureus.