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Dynamics of rebounding Bacillus subtilis spores determined using image-charge detection
Brandon L Barney1,2, Daniel E Austin3
1Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA.
Journal of Biological Physics
|September 7, 2017
Summary
This study reveals bacterial spores undergo significant plastic deformation upon high-velocity impact, losing most kinetic energy. This dynamic mechanical elasticity differs greatly from static measurements.
Area of Science:
- Biophysics
- Materials Science
- Microbiology
Background:
- Static measurements provide limited insight into bacterial spore mechanical properties.
- Understanding dynamic elasticity is crucial for spore survival and applications.
Purpose of the Study:
- To investigate the mechanical elasticity of bacterial spores during high-velocity impacts.
- To demonstrate a novel image-charge detection technique for dynamic particle analysis.
Main Methods:
- Bacterial spores (Bacillus subtilis) were accelerated in a vacuum and impacted a glass plate.
- A dual-stage image-charge detector measured pre- and post-impact velocities.
- Two impact velocity ranges (145 ± 12 m/s and 197 ± 17 m/s) were analyzed.
Main Results:
- Impacts were highly inelastic, with 69-74% of kinetic energy lost.
- Coefficients of restitution were low (0.49-0.53).
- Results showed significantly larger variance than polystyrene particles, implying plastic deformation.
Conclusions:
- Bacterial spores exhibit significant plastic deformation under dynamic, high-velocity impact.
- The novel image-charge technique is effective for measuring rebounding particle dynamics.
- These findings challenge static elasticity assumptions and highlight spore resilience.
