Correlation properties of collective motion in bacterial suspensions
The study of collective motion in bacterial suspensions has been of significant recent interest. To better understand the non-trivial spatio-temporal correlations emerging in the course of collective swimming in suspensions of motile bacteria, a simple model is employed: a bacterium is represented a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2013-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/15/10/105021 |
| _version_ | 1827874443169366016 |
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| author | Shawn D Ryan Andrey Sokolov Leonid Berlyand Igor S Aranson |
| author_facet | Shawn D Ryan Andrey Sokolov Leonid Berlyand Igor S Aranson |
| author_sort | Shawn D Ryan |
| collection | DOAJ |
| description | The study of collective motion in bacterial suspensions has been of significant recent interest. To better understand the non-trivial spatio-temporal correlations emerging in the course of collective swimming in suspensions of motile bacteria, a simple model is employed: a bacterium is represented as a force dipole with size, through the use of a short-range repelling potential, and shape. The model emphasizes two fundamental mechanisms: dipolar hydrodynamic interactions and short-range bacterial collisions. Using direct particle simulations validated by a dedicated experiment, we show that changing the swimming speed or concentration alters the time scale of sustained collective motion, consistent with experiment. Also, the correlation length in the collective state is almost constant as concentration and swimming speed change even though increasing each greatly increases the input of energy to the system. We demonstrate that the particle shape is critical for the onset of collective effects. In addition, new experimental results are presented illustrating the onset of collective motion with an ultrasound technique. This work exemplifies the delicate balance between various physical mechanisms governing collective motion in bacterial suspensions and provides important insights into its mesoscopic nature. |
| first_indexed | 2024-03-12T16:53:22Z |
| format | Article |
| id | doaj.art-2a8ec34f9b73461cab1718e6004af899 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:53:22Z |
| publishDate | 2013-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-2a8ec34f9b73461cab1718e6004af8992023-08-08T11:04:46ZengIOP PublishingNew Journal of Physics1367-26302013-01-01151010502110.1088/1367-2630/15/10/105021Correlation properties of collective motion in bacterial suspensionsShawn D Ryan0https://orcid.org/0000-0003-2468-1827Andrey Sokolov1Leonid Berlyand2Igor S Aranson3Department of Mathematics, Pennsylvania State University , University Park, PA 16802, USA; Materials Science Division, Argonne National Laboratory, 9700 S Cass Avenue, Argonne, IL 60439, USAMaterials Science Division, Argonne National Laboratory, 9700 S Cass Avenue, Argonne, IL 60439, USADepartment of Mathematics, Pennsylvania State University , University Park, PA 16802, USAMaterials Science Division, Argonne National Laboratory, 9700 S Cass Avenue, Argonne, IL 60439, USA; Engineering Sciences and Applied Mathematics, Northwestern University , 2145 Sheridan Road, Evanston, IL 60202, USAThe study of collective motion in bacterial suspensions has been of significant recent interest. To better understand the non-trivial spatio-temporal correlations emerging in the course of collective swimming in suspensions of motile bacteria, a simple model is employed: a bacterium is represented as a force dipole with size, through the use of a short-range repelling potential, and shape. The model emphasizes two fundamental mechanisms: dipolar hydrodynamic interactions and short-range bacterial collisions. Using direct particle simulations validated by a dedicated experiment, we show that changing the swimming speed or concentration alters the time scale of sustained collective motion, consistent with experiment. Also, the correlation length in the collective state is almost constant as concentration and swimming speed change even though increasing each greatly increases the input of energy to the system. We demonstrate that the particle shape is critical for the onset of collective effects. In addition, new experimental results are presented illustrating the onset of collective motion with an ultrasound technique. This work exemplifies the delicate balance between various physical mechanisms governing collective motion in bacterial suspensions and provides important insights into its mesoscopic nature.https://doi.org/10.1088/1367-2630/15/10/105021 |
| spellingShingle | Shawn D Ryan Andrey Sokolov Leonid Berlyand Igor S Aranson Correlation properties of collective motion in bacterial suspensions New Journal of Physics |
| title | Correlation properties of collective motion in bacterial suspensions |
| title_full | Correlation properties of collective motion in bacterial suspensions |
| title_fullStr | Correlation properties of collective motion in bacterial suspensions |
| title_full_unstemmed | Correlation properties of collective motion in bacterial suspensions |
| title_short | Correlation properties of collective motion in bacterial suspensions |
| title_sort | correlation properties of collective motion in bacterial suspensions |
| url | https://doi.org/10.1088/1367-2630/15/10/105021 |
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