Home › Microbiology › Preparation, Imaging, and Quantification of Bacterial Surface Motility Assays
Microbiology JoVE (Open Access) Citable · DOI

Preparation, Imaging, and Quantification of Bacterial Surface Motility Assays

DOI: 10.3791/52338-v
What you'll learn
  • ✓ Prepare standardized bacterial swarm assay plates with consistent media conditions
  • ✓ Apply macroscopic imaging techniques to capture detailed swarming dynamics
  • ✓ Quantify bacterial surface motility behavior across different strains
Protocol

Swarming motility is influenced by physical and environmental factors. We describe a two-phase protocol and guidelines to circumvent the challenges commonly associated with swarm assay preparation and data collection. A macroscopic imaging technique is employed to obtain detailed information on swarm behavior that is not provided by current analysis techniques.

Difficulty
intermediate
Total time
~24-48 hours (plate preparation ~1 hr, incubation overnight, imaging/analysis ~2-4 hrs)
Biosafety
BSL-1

Steps

1
Prepare swarm assay media and plates

Formulate growth media according to protocol specifications and pour plates to establish uniform conditions for bacterial swarming. Proper plate preparation minimizes environmental variability that affects motility assays.

▶ 01:44
2
Inoculate bacterial cultures onto swarm plates

Apply standardized bacterial inocula to prepared plates using consistent technique. Proper inoculation ensures reproducible swarm initiation across experimental replicates.

▶ 03:51
3
Acquire macroscopic images of swarming bacteria

Use macroscopic imaging setup to capture bacterial swarming patterns over time. This technique provides detailed visual data on swarm morphology and dynamics not available through conventional methods.

▶ 04:51
4
Quantify and analyze swarming dynamics data

Process captured images to extract quantitative metrics of bacterial motility behavior across different strains and conditions. Analysis reveals strain-specific swarming patterns and environmental influences.

▶ 05:45
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