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Related Experiment Videos

Microbial growth patterns described by fractal geometry.

M Obert1, P Pfeifer, M Sernetz

  • 1Institut für Biochemie und Endokrinologie, Justus-Liebig-Universität Giessen, Federal Republic of Germany.

Journal of Bacteriology
|March 1, 1990
PubMed
Summary

This study introduces fractal geometry to analyze microbial growth, revealing fractal dimensions as a new parameter. Microbial colonies exhibit fractal patterns, changing from mass to surface fractals during development.

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Area of Science:

  • * Biology
  • * Microbiology
  • * Biophysics

Background:

  • * Fractal geometry has elucidated inorganic system growth, including aggregation and dendritic patterns.
  • * Previous biological applications include lung airways, protein structures, and protein surface irregularity.
  • * Microbial growth patterns have not been previously analyzed using fractal geometry.

Purpose of the Study:

  • * To apply fractal geometry to investigate the growth patterns of two microbial species: Streptomyces griseus and Ashbya gossypii.
  • * To establish fractal dimensions as a novel growth parameter for microbial colonies.
  • * To analyze the transition of microbial colonies from mass to surface fractal structures during growth.

Main Methods:

  • * Application of fractal geometry concepts to microbial colony growth.

Related Experiment Videos

  • * Utilization of two distinct box-counting methods to evaluate fractal dimensions.
  • * Analysis of aggregates using box-counting applied to both the entire mycelial mass and its surface.

    • Main Results:

    • * Demonstrated fractal aggregates in biological systems, with individual cells as the smallest aggregating units and colonies as aggregates.
    • * Identified a fractal dimension (D) that describes the global structure of branched mycelia, increasing up to 1.5 during growth.
    • * Evaluated fractal dimensions (D) ranging from 1.3 to 2 using box-counting methods.
    • * Observed a shift in mycelial structure from mass fractal to surface fractal during growth.

    Conclusions:

    • * Fractal geometry provides a novel framework for understanding microbial colony development.
    • * The fractal dimension (D) serves as a quantifiable growth parameter for microbial systems.
    • * Microbial colony morphology dynamically transitions from a mass-dominated to a surface-dominated fractal structure as growth progresses.