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Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae

Quantification of Heavy Metals and Other Inorganic Contaminants on the Productivity of Microalgae

Published on: July 10, 2015

Entrainment dominates the interaction of microalgae with micron-sized objects.

Raphaël Jeanneret¹, Dmitri O Pushkin², Vasily Kantsler¹

¹Physics Department, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.

Nature Communications

|August 19, 2016

Summary

Swimming microorganisms like Chlamydomonas reinhardtii significantly enhance microparticle diffusion through direct entrainment during close encounters. This movement follows a jump-diffusion model, impacting plankton distribution.

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Area of Science:

Microbiology and Biophysics
Fluid Dynamics
Colloid Science

Background:

Microorganisms' activity influences surrounding micro-objects, enhancing diffusion beyond Brownian motion.
This phenomenon can affect the spatial distribution of planktonic species and particulate matter.

Purpose of the Study:

To investigate the detailed effect of eukaryotic flagellates, specifically Chlamydomonas reinhardtii, on microparticles.
To understand the dynamics of microorganism-colloid interactions and their impact on particle movement.

Main Methods:

Conducted macro- and microscopic experiments.
Utilized simulations and theoretical modeling.
Analyzed particle dynamics using a jump-diffusion process model.

Main Results:

Microorganism-colloid interactions are primarily driven by infrequent close encounters.
These encounters result in significant particle displacements via direct entrainment.
Particle dynamics were successfully modeled as a combination of standard diffusion and Poisson-distributed jumps.

Conclusions:

The heterogeneous dynamics of microparticles are significantly influenced by swimming microorganisms.
The observed effects are likely attributable to generic features of flagellates with front-mounted flagella.
This study provides a framework for understanding micro-scale transport phenomena in biological systems.