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Related Concept Videos

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Related Experiment Video

Updated: Feb 16, 2026

Automated Separation of C. elegans Variably Colonized by a Bacterial Pathogen
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Separation of pathogenic bacteria by chain length.

Jason P Beech1, Bao Dang Ho1, Geneviève Garriss2

  • 1Division of Solid State Physics and NanoLund, Lund University, SE-221 00, Sweden.

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|January 1, 2018
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Summary

Deterministic Lateral Displacement devices separate bacteria by size, aiding virulence studies. This method distinguishes Streptococcus pneumoniae strains, including encapsulated and non-encapsulated variants, for disease research.

Keywords:
Bacterial virulenceDeterministic lateral displacementMorphologySeparation

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Area of Science:

  • Microbiology
  • Biophysics
  • Pathogen Research

Background:

  • Bacterial virulence factors, such as chain length and capsule presence in Streptococcus pneumoniae, influence disease severity.
  • Understanding these factors requires isolating specific bacterial subpopulations.

Purpose of the Study:

  • To utilize Deterministic Lateral Displacement (DLD) devices for separating bacterial subpopulations based on particle length.
  • To enable detailed studies on the role of morphology and capsule presence in Streptococcus pneumoniae virulence.

Main Methods:

  • Optimized DLD devices for high sensitivity to particle length.
  • Separated cultured Streptococcus pneumoniae into subpopulations based on morphology (single cocci, diplococci, chains).
  • Separated mixed populations of encapsulated and non-encapsulated Streptococcus pneumoniae strains.

Main Results:

  • Successfully separated Streptococcus pneumoniae subpopulations by morphological type using DLD.
  • Demonstrated the device's capability to separate genetically similar encapsulated and non-encapsulated strains.

Conclusions:

  • DLD devices are effective for isolating bacterial subpopulations based on physical properties.
  • This technique facilitates in-depth investigation of bacterial virulence factors and strain differentiation.