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Determination of Microbial Extracellular Enzyme Activity in Waters, Soils, and Sediments using High Throughput Microplate Assays
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Bacterial activity hinders particle sedimentation.

Jaspreet Singh1, Alison E Patteson2, Bryan O Torres Maldonado1

  • 1Department of Mechanical Engineering & Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA. parratia@seas.upenn.edu.

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Summary
This summary is machine-generated.

Swimming bacteria slow down particle sedimentation and increase dispersion. This effect is observed even at low concentrations, with speed depending linearly on bacterial presence. Bacterial activity decreases over time.

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Area of Science:

  • Fluid dynamics
  • Microbiology
  • Biophysics

Background:

  • Sedimentation dynamics in fluids are crucial for natural and industrial processes.
  • The role of active micro-organisms, like swimming bacteria, in fluid dynamics is increasingly recognized.

Purpose of the Study:

  • To investigate how the concentration of swimming bacteria (E. coli) affects the sedimentation dynamics of passive particles.
  • To understand the impact of bacteria on sedimentation speed and particle dispersion.

Main Methods:

  • Experimental investigation of passive particle sedimentation in fluids with varying concentrations of E. coli.
  • Analysis of sedimentation front speed and particle dispersion.
  • Modeling using an advection-diffusion equation coupled with bacteria population dynamics.

Main Results:

  • Swimming bacteria significantly reduce sedimentation front speed, even in dilute regimes.
  • Bacteria increase the dispersion of passive particles, affecting sedimentation front width.
  • Particle sedimentation speed shows a linear dependence on bacterial concentration at short times.
  • Bacterial activity was observed to decay over longer experimental timescales.

Conclusions:

  • The presence of swimming bacteria fundamentally alters passive particle sedimentation dynamics.
  • A predictive model using the ratio of single particle speed to bacteria flow speed can estimate front sedimentation speed.
  • Bacterial population dynamics play a key role in governing sedimentation processes in active fluids.