Enhancement of bacterial rheotaxis in non-Newtonian fluids
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916385977794560 |
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| author | Maldonado, Bryan O. Torres Théry, Albane Tao, Ran Brosseau, Quentin Mathijssen, Arnold J. T. M. Arratia, Paulo E. |
| author_facet | Maldonado, Bryan O. Torres Théry, Albane Tao, Ran Brosseau, Quentin Mathijssen, Arnold J. T. M. Arratia, Paulo E. |
| contents | Bacteria often exhibit upstream swimming, which can cause the contamination of biomedical devices and the infection of organs including the urethra or lungs. This process, called rheotaxis, has been studied extensively in Newtonian fluids. However, most microorganisms thrive in non-Newtonian fluids that contain suspended polymers such as mucus and biofilms. Here, we investigate the rheotatic behavior of E. coli near walls in non-Newtonian fluids. Our experiments demonstrate that bacterial upstream swimming is enhanced by an order of magnitude in shear-thinning polymeric fluids relative to Newtonian fluids. This result is explained by direct numerical simulations, revealing a torque that promotes the alignment of bacteria against the flow. From this analysis, we develop a theoretical model that accurately describes experimental rheotatic data in both Newtonian and shear-thinning fluids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13692 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Enhancement of bacterial rheotaxis in non-Newtonian fluids Maldonado, Bryan O. Torres Théry, Albane Tao, Ran Brosseau, Quentin Mathijssen, Arnold J. T. M. Arratia, Paulo E. Fluid Dynamics Soft Condensed Matter Biological Physics Bacteria often exhibit upstream swimming, which can cause the contamination of biomedical devices and the infection of organs including the urethra or lungs. This process, called rheotaxis, has been studied extensively in Newtonian fluids. However, most microorganisms thrive in non-Newtonian fluids that contain suspended polymers such as mucus and biofilms. Here, we investigate the rheotatic behavior of E. coli near walls in non-Newtonian fluids. Our experiments demonstrate that bacterial upstream swimming is enhanced by an order of magnitude in shear-thinning polymeric fluids relative to Newtonian fluids. This result is explained by direct numerical simulations, revealing a torque that promotes the alignment of bacteria against the flow. From this analysis, we develop a theoretical model that accurately describes experimental rheotatic data in both Newtonian and shear-thinning fluids. |
| title | Enhancement of bacterial rheotaxis in non-Newtonian fluids |
| topic | Fluid Dynamics Soft Condensed Matter Biological Physics |
| url | https://arxiv.org/abs/2408.13692 |