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Related Experiment Video

Updated: Jun 10, 2026

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

Hydrodynamic interaction of two unsteady model microorganisms.

Davide Giacché¹, Takuji Ishikawa

¹Department of Bioengineering and Robotics, Graduate School of Engineering, Tohoku University, 6-6-01, Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan. giacche@pfsl.mech.tohoku.ac.jp

Journal of Theoretical Biology

|August 11, 2010

Summary

Unsteady ciliary propulsion significantly alters microorganism interactions and trajectories in suspensions. This dynamic behavior impacts cell scattering and diffusion, offering new insights into biological randomness.

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Last Updated: Jun 10, 2026

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Published on: May 28, 2007

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Window on a Microworld: Simple Microfluidic Systems for Studying Microbial Transport in Porous Media

Window on a Microworld: Simple Microfluidic Systems for Studying Microbial Transport in Porous Media

Published on: May 3, 2010

Area of Science:

Fluid dynamics
Biophysics
Microbiology

Background:

Understanding pair-wise interactions of swimming microorganisms is crucial for rheology and transport in suspensions.
Microorganisms like ciliates drive fluid motion through surface deformations.

Purpose of the Study:

To numerically investigate the hydrodynamic interaction of two ciliated microorganisms.
To model these microorganisms as spherical squirmers with time-dependent surface deformations.

Main Methods:

Utilized a boundary-element method for numerical simulation.
Modeled microorganisms as spherical squirmers with unsteady ciliary propulsion.

Main Results:

Unsteady terms in ciliary propulsion significantly affect cell trajectories and scattering angles.
Near-field interaction duration and intensity are notably modified by unsteadiness.
These findings have implications for diffusion properties in semi-dilute suspensions.

Conclusions:

Unsteadiness in ciliary propulsion is a key factor in microorganism interactions.
Hydrodynamic interactions can contribute to biological randomness, blurring distinctions with intrinsic randomness.
This study enhances the understanding and modeling of interacting microorganisms.