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Effects of Advective-Diffusive Transport of Multiple Chemoattractants on Motility of Engineered Chemosensory Particles in Fluidic Environments

1
Department of Mathematics, The University of Texas, Austin, TX 78712-1202, USA
2
Mechanical Engineering Division, Southwest Research Institute, San Antonio, TX 78238-5166, USA
3
Department of Mathematics, Trinity University, One Trinity Place, San Antonio, TX 78212-7200, USA
4
Department of Biology, Trinity University, One Trinity Place, San Antonio, TX 78212-7200, USA
5
Fondazione Istituto Italiano di Tecnologia, Center for Life Nanoscience at la Sapienza, vle Regina Margherita, 00165 Rome, Italy
6
Istituto Applicazioni del Calcolo, Via dei Taurini 19, 00185 Roma, Italy
*
Author to whom correspondence should be addressed.
Current address: Edwards Aquifer Authority, San Antonio, TX 78215, USA.
Entropy 2019, 21(5), 465; https://doi.org/10.3390/e21050465
Received: 15 March 2019 / Revised: 30 April 2019 / Accepted: 1 May 2019 / Published: 4 May 2019
(This article belongs to the Collection Advances in Applied Statistical Mechanics)
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Abstract

Motility behavior of an engineered chemosensory particle (ECP) in fluidic environments is driven by its responses to chemical stimuli. One of the challenges to understanding such behaviors lies in tracking changes in chemical signal gradients of chemoattractants and ECP-fluid dynamics as the fluid is continuously disturbed by ECP motion. To address this challenge, we introduce a new multiscale numerical model to simulate chemotactic swimming of an ECP in confined fluidic environments by accounting for motility-induced disturbances in spatiotemporal chemoattractant distributions. The model accommodates advective-diffusive transport of unmixed chemoattractants, ECP-fluid hydrodynamics at the ECP-fluid interface, and spatiotemporal disturbances in the chemoattractant concentrations due to particle motion. Demonstrative simulations are presented with an ECP, mimicking Escherichia coli (E. coli) chemotaxis, released into initially quiescent fluids with different source configurations of the chemoattractants N-methyl-L-aspartate and L-serine. Simulations demonstrate that initial distributions and temporal evolution of chemoattractants and their release modes (instantaneous vs. continuous, point source vs. distributed) dictate time histories of chemotactic motility of an ECP. Chemotactic motility is shown to be largely determined by spatiotemporal variation in chemoattractant concentration gradients due to transient disturbances imposed by ECP-fluid hydrodynamics, an observation not captured in previous numerical studies that relied on static chemoattractant concentration fields. View Full-Text
Keywords: chemotaxis; engineered chemosensory particle; multiple chemoattractants; particle-fluid hydrodynamics; multiscale numerical model chemotaxis; engineered chemosensory particle; multiple chemoattractants; particle-fluid hydrodynamics; multiscale numerical model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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King, D.; Başağaoğlu, H.; Nguyen, H.; Healy, F.; Whitman, M.; Succi, S. Effects of Advective-Diffusive Transport of Multiple Chemoattractants on Motility of Engineered Chemosensory Particles in Fluidic Environments. Entropy 2019, 21, 465.

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