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Modica KJ, Omar AK, Takatori SC. Boundary design regulates the diffusion of active matter in heterogeneous environments. SOFT MATTER 2023; 19:1890-1899. [PMID: 36790413 DOI: 10.1039/d2sm01421a] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Physical boundaries play a key role in governing the overall transport properties of nearby self-propelled particles. In this work, we develop dispersion theories and conduct Brownian dynamics simulations to predict the coupling between surface accumulation and effective diffusivity of active particles in boundary-rich media. We focus on three models that are well-understood for passive systems: particle transport in (i) an array of fixed volume-excluding obstacles; (ii) a pore with spatially heterogeneous width; and (iii) a tortuous path with kinks and corners. While the impact of these entropic barriers on passive particle transport is well established, we find that these classical models of porous media flows break down due to the unique interplay between activity and the microstructure of the internal geometry. We study the activity-induced slowdown of effective diffusivity by formulating a Smoluchowski description of long-time self diffusivity which contains contributions from the density and fluctuation fields of the active particles. Particle-based and finite element simulations corroborate this perspective and reveal important nonequilibrium considerations of active transport.
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Affiliation(s)
- Kevin J Modica
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Ahmad K Omar
- Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Sho C Takatori
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
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2
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Elbourne A, Chapman J, Gelmi A, Cozzolino D, Crawford RJ, Truong VK. Bacterial-nanostructure interactions: The role of cell elasticity and adhesion forces. J Colloid Interface Sci 2019; 546:192-210. [PMID: 30921674 DOI: 10.1016/j.jcis.2019.03.050] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/13/2019] [Accepted: 03/14/2019] [Indexed: 02/07/2023]
Abstract
The attachment of single-celled organisms, namely bacteria and fungi, to abiotic surfaces is of great interest to both the scientific and medical communities. This is because the interaction of such cells has important implications in a range of areas, including biofilm formation, biofouling, antimicrobial surface technologies, and bio-nanotechnologies, as well as infection development, control, and mitigation. While central to many biological phenomena, the factors which govern microbial surface attachment are still not fully understood. This lack of understanding is a direct consequence of the complex nature of cell-surface interactions, which can involve both specific and non-specific interactions. For applications involving micro- and nano-structured surfaces, developing an understanding of such phenomenon is further complicated by the diverse nature of surface architectures, surface chemistry, variation in cellular physiology, and the intended technological output. These factors are extremely important to understand in the emerging field of antibacterial nanostructured surfaces. The aim of this perspective is to re-frame the discussion surrounding the mechanism of nanostructured-microbial surface interactions. Broadly, the article reviews our current understanding of these phenomena, while highlighting the knowledge gaps surrounding the adhesive forces which govern bacterial-nanostructure interactions and the role of cell membrane rigidity in modulating surface activity. The roles of surface charge, cell rigidity, and cell-surface adhesion force in bacterial-surface adsorption are discussed in detail. Presently, most studies have overlooked these areas, which has left many questions unanswered. Further, this perspective article highlights the numerous experimental issues and misinterpretations which surround current studies of antibacterial nanostructured surfaces.
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Affiliation(s)
- Aaron Elbourne
- School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia; Nanobiotechnology Laboratory, RMIT University, Melbourne, VIC 3001, Australia.
| | - James Chapman
- School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia; Nanobiotechnology Laboratory, RMIT University, Melbourne, VIC 3001, Australia
| | - Amy Gelmi
- School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia
| | - Daniel Cozzolino
- School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia
| | - Russell J Crawford
- School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia; Nanobiotechnology Laboratory, RMIT University, Melbourne, VIC 3001, Australia
| | - Vi Khanh Truong
- School of Science, College of Science, Engineering and Health, RMIT University, Melbourne, VIC 3001, Australia; Nanobiotechnology Laboratory, RMIT University, Melbourne, VIC 3001, Australia
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Truong VK, Bhadra CM, Christofferson AJ, Yarovsky I, Al Kobaisi M, Garvey CJ, Ponamoreva ON, Alferov SV, Alferov VA, Tharushi Perera PG, Nguyen DHK, Buividas R, Juodkazis S, Crawford RJ, Ivanova EP. Three-Dimensional Organization of Self-Encapsulating Gluconobacter oxydans Bacterial Cells. ACS OMEGA 2017; 2:8099-8107. [PMID: 30023573 PMCID: PMC6045399 DOI: 10.1021/acsomega.7b01282] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 11/02/2017] [Indexed: 05/03/2023]
Abstract
Self-organized bacteria have been the subject of interest for a number of applications, including the construction of microbial fuel cells. In this paper, we describe the formation of a self-organized, three-dimensional network that is constructed using Gluconobacter oxydans B-1280 cells in a hydrogel consisting of poly(vinyl alcohol) (PVA) with N-vinyl pyrrolidone (VP) as a cross-linker, in which the bacterial cells are organized in a particular side-by-side alignment. We demonstrated that nonmotile G. oxydans cells are able to reorganize themselves, transforming and utilizing PVA-VP polymeric networks through the molecular interactions of bacterial extracellular polysaccharide (EPS) components such as acetan, cellulose, dextran, and levan. Molecular dynamics simulations of the G. oxydans EPS components interacting with the hydrogel polymeric network showed that the solvent-exposed loops of PVA-VP extended and engaged in bacterial self-encapsulation.
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Affiliation(s)
- Vi Khanh Truong
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Chris M. Bhadra
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Andrew J. Christofferson
- School of Engineering and School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Irene Yarovsky
- School of Engineering and School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Mohammad Al Kobaisi
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Christopher J. Garvey
- Australian
Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, Sydney, New South Wales 2232, Australia
| | - Olga N. Ponamoreva
- Biotechnology
Department and Chemistry Department, Tula State University, 92 Lenin pr., Tula 300012, Russian Federation
| | - Sergey V. Alferov
- Biotechnology
Department and Chemistry Department, Tula State University, 92 Lenin pr., Tula 300012, Russian Federation
| | - Valery A. Alferov
- Biotechnology
Department and Chemistry Department, Tula State University, 92 Lenin pr., Tula 300012, Russian Federation
| | - Palalle G. Tharushi Perera
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Duy H. K. Nguyen
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Ričardas Buividas
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Saulius Juodkazis
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | - Russell J. Crawford
- School of Engineering and School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Elena P. Ivanova
- School
of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
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Pham VTH, Murugaraj P, Mathes F, Tan BK, Truong VK, Murphy DV, Mainwaring DE. Copolymers enhance selective bacterial community colonization for potential root zone applications. Sci Rep 2017; 7:15902. [PMID: 29162884 PMCID: PMC5698314 DOI: 10.1038/s41598-017-16253-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 11/08/2017] [Indexed: 12/31/2022] Open
Abstract
Managing the impact of anthropogenic and climate induced stress on plant growth remains a challenge. Here we show that polymeric hydrogels, which maintain their hydrous state, can be designed to exploit functional interactions with soil microorganisms. This microbial enhancement may mitigate biotic and abiotic stresses limiting productivity. The presence of mannan chains within synthetic polyacrylic acid (PAA) enhanced the dynamics and selectivity of bacterial ingress in model microbial systems and soil microcosms. Pseudomonas fluorescens exhibiting high mannan binding adhesins showed higher ingress and localised microcolonies throughout the polymeric network. In contrast, ingress of Bacillus subtilis, lacking adhesins, was unaltered by mannan showing motility comparable to bulk liquids. Incubation within microcosms of an agricultural soil yielded hydrogel populations significantly increased from the corresponding soil. Bacterial diversity was markedly higher in mannan containing hydrogels compared to both control polymer and soil, indicating enhanced selectivity towards microbial families that contain plant beneficial species. Here we propose functional polymers applied to the potential root zone which can positively influence rhizobacteria colonization and potentially plant growth as a new approach to stress tolerance.
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Affiliation(s)
- Vy T H Pham
- School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Pandiyan Murugaraj
- School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Falko Mathes
- SoilsWest, UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, WA6009, Australia
| | - Boon K Tan
- School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Vi Khanh Truong
- School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Daniel V Murphy
- SoilsWest, UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, WA6009, Australia
| | - David E Mainwaring
- School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
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