1
|
Blifernez-Klassen O, Hassa J, Reinecke DL, Busche T, Klassen V, Kruse O. Microbial Diversity and Community Structure of Wastewater-Driven Microalgal Biofilms. Microorganisms 2023; 11:2994. [PMID: 38138138 PMCID: PMC10745310 DOI: 10.3390/microorganisms11122994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/12/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
Dwindling water sources increase the need for efficient wastewater treatment. Solar-driven algal turf scrubber (ATS) system may remediate wastewater by supporting the development and growth of periphytic microbiomes that function and interact in a highly dynamic manner through symbiotic interactions. Using ITS and 16S rRNA gene amplicon sequencing, we profiled the microbial communities of four microbial biofilms from ATS systems operated with municipal wastewater (mWW), diluted cattle and pig manure (CattleM and PigM), and biogas plant effluent supernatant (BGE) in comparison to the initial inocula and the respective wastewater substrates. The wastewater-driven biofilms differed significantly in their biodiversity and structure, exhibiting an inocula-independent but substrate-dependent establishment of the microbial communities. The prokaryotic communities were comparable among themselves and with other microbiomes of aquatic environments and were dominated by metabolically flexible prokaryotes such as nitrifiers, polyphosphate-accumulating and algicide-producing microorganisms, and anoxygenic photoautotrophs. Striking differences occurred in eukaryotic communities: While the mWW biofilm was characterized by high biodiversity and many filamentous (benthic) microalgae, the agricultural wastewater-fed biofilms consisted of less diverse communities with few benthic taxa mainly inhabited by unicellular chlorophytes and saprophytes/parasites. This study advances our understanding of the microbiome structure and function within the ATS-based wastewater treatment process.
Collapse
Affiliation(s)
- Olga Blifernez-Klassen
- Algae Biotechnology and Bioenergy, Faculty of Biology, Center for Biotechnology (CeBiTec), Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany; (O.B.-K.); (V.K.)
| | - Julia Hassa
- Center for Biotechnology (CeBiTec), Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany (T.B.)
| | - Diana L. Reinecke
- Institute of Bio- and Geosciences, Plant Sciences, Forschungszentrum Jülich, Wilhelm-Johnen-Strasse, 52428 Juelich, Germany;
| | - Tobias Busche
- Center for Biotechnology (CeBiTec), Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany (T.B.)
- Medical School East Westphalia-Lippe, Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany
| | - Viktor Klassen
- Algae Biotechnology and Bioenergy, Faculty of Biology, Center for Biotechnology (CeBiTec), Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany; (O.B.-K.); (V.K.)
| | - Olaf Kruse
- Algae Biotechnology and Bioenergy, Faculty of Biology, Center for Biotechnology (CeBiTec), Bielefeld University, Universitätsstrasse 27, 33615 Bielefeld, Germany; (O.B.-K.); (V.K.)
| |
Collapse
|
2
|
Vale F, Sousa CA, Sousa H, Simões LC, McBain AJ, Simões M. Bacteria and microalgae associations in periphyton-mechanisms and biotechnological opportunities. FEMS Microbiol Rev 2023; 47:fuad047. [PMID: 37586879 DOI: 10.1093/femsre/fuad047] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 08/02/2023] [Accepted: 08/14/2023] [Indexed: 08/18/2023] Open
Abstract
Phototrophic and heterotrophic microorganisms coexist in complex and dynamic structures called periphyton. These structures shape the biogeochemistry and biodiversity of aquatic ecosystems. In particular, microalgae-bacteria interactions are a prominent focus of study by microbial ecologists and can provide biotechnological opportunities for numerous applications (i.e. microalgal bloom control, aquaculture, biorefinery, and wastewater bioremediation). In this review, we analyze the species dynamics (i.e. periphyton formation and factors determining the prevalence of one species over another), coexisting communities, exchange of resources, and communication mechanisms of periphytic microalgae and bacteria. We extend periphyton mathematical modelling as a tool to comprehend complex interactions. This review is expected to boost the applicability of microalgae-bacteria consortia, by drawing out knowledge from natural periphyton.
Collapse
Affiliation(s)
- Francisca Vale
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Cátia A Sousa
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Henrique Sousa
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Lúcia C Simões
- CEB - Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
- LABBELS - Associate Laboratory in Biotechnology, Bioengineering and Microelectromechanical Systems, Braga/Guimarães, Portugal
| | - Andrew J McBain
- School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PT, United Kingdom
| | - Manuel Simões
- ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
- LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| |
Collapse
|
3
|
Murphy EAK, Barros JM, Schultz MP, Flack KA, Steppe CN, Reidenbach MA. Boundary layer hydrodynamics of patchy biofilms. BIOFOULING 2022; 38:696-714. [PMID: 36062568 DOI: 10.1080/08927014.2022.2117033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 08/07/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Algal biofilms, ubiquitous in aquatic systems, reduce the performance of engineered systems and alter ecosystem processes. Biofilm morphology is dynamic throughout community development, with patchiness occurring due to periodic sloughing, but little is known about how community level physical structure affects hydrodynamics. This study uses high resolution particle image velocimetry (PIV) to examine spatially explicit turbulence over sparse, uniform and patchy biofilm at turbulent Reynolds numbers. All biofilms increase the near-bed turbulence production, Reynolds shear stress, and rotational flow compared to a smooth wall, and non-uniform biofilms have the greatest increase in these parameters, compared with a uniform or sparse biofilm. However, a higher drag coefficient over uniform biofilm compared with non-uniform biofilm indicates that percent coverage (the amount of area covered by the biofilm) is a useful predictor of a biofilm's relative effect on the total drag along surfaces, and in particular the effect on ship performance.
Collapse
Affiliation(s)
- Elizabeth A K Murphy
- Department of Environmental Sciences, University of Virginia, Charlottesville, USA
| | - Julio M Barros
- Department of Mechanical Engineering, United States Naval Academy, Annapolis, Maryland, USA
| | - Michael P Schultz
- Department of Naval Architecture and Ocean Engineering, United States Naval Academy, Annapolis, Maryland, USA
| | - Karen A Flack
- Department of Mechanical Engineering, United States Naval Academy, Annapolis, Maryland, USA
| | - Cecily N Steppe
- Department of Oceanography, United States Naval Academy, Annapolis, Maryland, USA
| | - Matthew A Reidenbach
- Department of Environmental Sciences, University of Virginia, Charlottesville, USA
| |
Collapse
|
4
|
Murphy EAK, Barros JM, Schultz MP, Flack KA, Steppe CN, Reidenbach MA. Roughness effects of diatomaceous slime fouling on turbulent boundary layer hydrodynamics. BIOFOULING 2018; 34:976-988. [PMID: 30602310 DOI: 10.1080/08927014.2018.1517867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 08/23/2018] [Accepted: 08/25/2018] [Indexed: 06/09/2023]
Abstract
Biofilm fouling significantly impacts ship performance. Here, the impact of biofilm on boundary layer structure at a ship-relevant, low Reynolds number was investigated. Boundary layer measurements were performed over slime-fouled plates using high resolution particle image velocimetry (PIV). The velocity profile over the biofilm showed a downward shift in the log-law region (ΔU+), resulting in an effective roughness height (ks) of 8.8 mm, significantly larger than the physical thickness of the biofilm (1.7 ± 0.5 mm) and generating more than three times as much frictional drag as the smooth-wall. The skin-friction coefficient, Cf, of the biofilm was 9.0 × 10-3 compared with 2.9 × 10-3 for the smooth wall. The biofilm also enhances turbulent kinetic energy (tke) and Reynolds shear stress, which are more heterogeneous in the streamwise direction than smooth-wall flows. This suggests that biofilms increase drag due to high levels of momentum transport, likely resulting from protruding streamers and surface compliance.
Collapse
Affiliation(s)
- Elizabeth A K Murphy
- a Department of Environmental Sciences , University of Virginia , Charlottesville , VA , USA
| | - Julio M Barros
- b Department of Mechanical Engineering , United States Naval Academy , Annapolis , MD , USA
| | - Michael P Schultz
- c Department of Naval Architecture and Ocean Engineering , United States Naval Academy , Annapolis , MD , USA
| | - Karen A Flack
- d Department of Mechanical Engineering , United States Naval Academy , Annapolis , MD , USA
| | - Cecily N Steppe
- e Department of Oceanography , United States Naval Academy , Annapolis , MD , USA
| | - Matthew A Reidenbach
- f Department of Environmental Sciences , University of Virginia , Charlottesville , VA , USA
| |
Collapse
|
5
|
Oyebamiji OK, Wilkinson DJ, Jayathilake PG, Rushton SP, Bridgens B, Li B, Zuliani P. A Bayesian approach to modelling the impact of hydrodynamic shear stress on biofilm deformation. PLoS One 2018; 13:e0195484. [PMID: 29649240 PMCID: PMC5896950 DOI: 10.1371/journal.pone.0195484] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 03/24/2018] [Indexed: 11/18/2022] Open
Abstract
We investigate the feasibility of using a surrogate-based method to emulate the deformation and detachment behaviour of a biofilm in response to hydrodynamic shear stress. The influence of shear force, growth rate and viscoelastic parameters on the patterns of growth, structure and resulting shape of microbial biofilms was examined. We develop a statistical modelling approach to this problem, using combination of Bayesian Poisson regression and dynamic linear models for the emulation. We observe that the hydrodynamic shear force affects biofilm deformation in line with some literature. Sensitivity results also showed that the expected number of shear events, shear flow, yield coefficient for heterotrophic bacteria and extracellular polymeric substance (EPS) stiffness per unit EPS mass are the four principal mechanisms governing the bacteria detachment in this study. The sensitivity of the model parameters is temporally dynamic, emphasising the significance of conducting the sensitivity analysis across multiple time points. The surrogate models are shown to perform well, and produced ≈ 480 fold increase in computational efficiency. We conclude that a surrogate-based approach is effective, and resulting biofilm structure is determined primarily by a balance between bacteria growth, viscoelastic parameters and applied shear stress.
Collapse
Affiliation(s)
- Oluwole K. Oyebamiji
- School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
- * E-mail:
| | - Darren J. Wilkinson
- School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | | | - Steve P. Rushton
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Ben Bridgens
- School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Bowen Li
- School of Computing Science, Newcastle University, Newcastle upon Tyne, NE4 5TG, United Kingdom
| | - Paolo Zuliani
- School of Computing Science, Newcastle University, Newcastle upon Tyne, NE4 5TG, United Kingdom
| |
Collapse
|
6
|
Jayathilake PG, Gupta P, Li B, Madsen C, Oyebamiji O, González-Cabaleiro R, Rushton S, Bridgens B, Swailes D, Allen B, McGough AS, Zuliani P, Ofiteru ID, Wilkinson D, Chen J, Curtis T. A mechanistic Individual-based Model of microbial communities. PLoS One 2017; 12:e0181965. [PMID: 28771505 PMCID: PMC5542553 DOI: 10.1371/journal.pone.0181965] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Accepted: 07/10/2017] [Indexed: 01/12/2023] Open
Abstract
Accurate predictive modelling of the growth of microbial communities requires the credible representation of the interactions of biological, chemical and mechanical processes. However, although biological and chemical processes are represented in a number of Individual-based Models (IbMs) the interaction of growth and mechanics is limited. Conversely, there are mechanically sophisticated IbMs with only elementary biology and chemistry. This study focuses on addressing these limitations by developing a flexible IbM that can robustly combine the biological, chemical and physical processes that dictate the emergent properties of a wide range of bacterial communities. This IbM is developed by creating a microbiological adaptation of the open source Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). This innovation should provide the basis for “bottom up” prediction of the emergent behaviour of entire microbial systems. In the model presented here, bacterial growth, division, decay, mechanical contact among bacterial cells, and adhesion between the bacteria and extracellular polymeric substances are incorporated. In addition, fluid-bacteria interaction is implemented to simulate biofilm deformation and erosion. The model predicts that the surface morphology of biofilms becomes smoother with increased nutrient concentration, which agrees well with previous literature. In addition, the results show that increased shear rate results in smoother and more compact biofilms. The model can also predict shear rate dependent biofilm deformation, erosion, streamer formation and breakup.
Collapse
Affiliation(s)
- Pahala Gedara Jayathilake
- School of Mechanical & Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
- * E-mail: (PGJ); (SR); (TC); (JC)
| | - Prashant Gupta
- School of Biology, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Bowen Li
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Curtis Madsen
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Oluwole Oyebamiji
- School of Mathematics & Statistics, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Rebeca González-Cabaleiro
- School of Chemical Engineering and Advanced Materials, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Steve Rushton
- School of Biology, Newcastle University, Newcastle upon Tyne, United Kingdom
- * E-mail: (PGJ); (SR); (TC); (JC)
| | - Ben Bridgens
- School of Civil Engineering & Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - David Swailes
- School of Mechanical & Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ben Allen
- School of Civil Engineering & Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - A. Stephen McGough
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Paolo Zuliani
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Irina Dana Ofiteru
- School of Chemical Engineering and Advanced Materials, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Darren Wilkinson
- School of Mathematics & Statistics, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Jinju Chen
- School of Mechanical & Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
- * E-mail: (PGJ); (SR); (TC); (JC)
| | - Tom Curtis
- School of Civil Engineering & Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
- * E-mail: (PGJ); (SR); (TC); (JC)
| |
Collapse
|
7
|
Boltz JP, Smets BF, Rittmann BE, van Loosdrecht MCM, Morgenroth E, Daigger GT. From biofilm ecology to reactors: a focused review. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:1753-1760. [PMID: 28452767 DOI: 10.2166/wst.2017.061] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Biofilms are complex biostructures that appear on all surfaces that are regularly in contact with water. They are structurally complex, dynamic systems with attributes of primordial multicellular organisms and multifaceted ecosystems. The presence of biofilms may have a negative impact on the performance of various systems, but they can also be used beneficially for the treatment of water (defined herein as potable water, municipal and industrial wastewater, fresh/brackish/salt water bodies, groundwater) as well as in water stream-based biological resource recovery systems. This review addresses the following three topics: (1) biofilm ecology, (2) biofilm reactor technology and design, and (3) biofilm modeling. In so doing, it addresses the processes occurring in the biofilm, and how these affect and are affected by the broader biofilm system. The symphonic application of a suite of biological methods has led to significant advances in the understanding of biofilm ecology. New metabolic pathways, such as anaerobic ammonium oxidation (anammox) or complete ammonium oxidation (comammox) were first observed in biofilm reactors. The functions, properties, and constituents of the biofilm extracellular polymeric substance matrix are somewhat known, but their exact composition and role in the microbial conversion kinetics and biochemical transformations are still to be resolved. Biofilm grown microorganisms may contribute to increased metabolism of micro-pollutants. Several types of biofilm reactors have been used for water treatment, with current focus on moving bed biofilm reactors, integrated fixed-film activated sludge, membrane-supported biofilm reactors, and granular sludge processes. The control and/or beneficial use of biofilms in membrane processes is advancing. Biofilm models have become essential tools for fundamental biofilm research and biofilm reactor engineering and design. At the same time, the divergence between biofilm modeling and biofilm reactor modeling approaches is recognized.
Collapse
Affiliation(s)
| | - Barth F Smets
- Department of Environmental Engineering, Technical University of Denmark, Miljøvej 113, 2800 Kgs. Lyngby, Denmark
| | - Bruce E Rittmann
- Swette Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, P.O. Box 875701, Tempe, AZ 85287-5701, USA
| | - Mark C M van Loosdrecht
- Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Eberhard Morgenroth
- ETH Zürich, Institute of Environmental Engineering, 8093 Zürich, Switzerland and Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland
| | - Glen T Daigger
- University of Michigan, 1351 Beal Ave., Ann Arbor, MI 48109, USA E-mail:
| |
Collapse
|
8
|
Jayathilake PG, Gupta P, Li B, Madsen C, Oyebamiji O, González-Cabaleiro R, Rushton S, Bridgens B, Swailes D, Allen B, McGough AS, Zuliani P, Ofiteru ID, Wilkinson D, Chen J, Curtis T. A mechanistic Individual-based Model of microbial communities. PLoS One 2017. [PMID: 28771505 DOI: 10.1371/jou0181965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023] Open
Abstract
Accurate predictive modelling of the growth of microbial communities requires the credible representation of the interactions of biological, chemical and mechanical processes. However, although biological and chemical processes are represented in a number of Individual-based Models (IbMs) the interaction of growth and mechanics is limited. Conversely, there are mechanically sophisticated IbMs with only elementary biology and chemistry. This study focuses on addressing these limitations by developing a flexible IbM that can robustly combine the biological, chemical and physical processes that dictate the emergent properties of a wide range of bacterial communities. This IbM is developed by creating a microbiological adaptation of the open source Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). This innovation should provide the basis for "bottom up" prediction of the emergent behaviour of entire microbial systems. In the model presented here, bacterial growth, division, decay, mechanical contact among bacterial cells, and adhesion between the bacteria and extracellular polymeric substances are incorporated. In addition, fluid-bacteria interaction is implemented to simulate biofilm deformation and erosion. The model predicts that the surface morphology of biofilms becomes smoother with increased nutrient concentration, which agrees well with previous literature. In addition, the results show that increased shear rate results in smoother and more compact biofilms. The model can also predict shear rate dependent biofilm deformation, erosion, streamer formation and breakup.
Collapse
Affiliation(s)
- Pahala Gedara Jayathilake
- School of Mechanical & Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Prashant Gupta
- School of Biology, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Bowen Li
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Curtis Madsen
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Oluwole Oyebamiji
- School of Mathematics & Statistics, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Rebeca González-Cabaleiro
- School of Chemical Engineering and Advanced Materials, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Steve Rushton
- School of Biology, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ben Bridgens
- School of Civil Engineering & Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - David Swailes
- School of Mechanical & Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ben Allen
- School of Civil Engineering & Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - A Stephen McGough
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Paolo Zuliani
- School of Computing Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Irina Dana Ofiteru
- School of Chemical Engineering and Advanced Materials, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Darren Wilkinson
- School of Mathematics & Statistics, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Jinju Chen
- School of Mechanical & Systems Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Tom Curtis
- School of Civil Engineering & Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| |
Collapse
|
9
|
Battin TJ, Besemer K, Bengtsson MM, Romani AM, Packmann AI. The ecology and biogeochemistry of stream biofilms. Nat Rev Microbiol 2016; 14:251-63. [DOI: 10.1038/nrmicro.2016.15] [Citation(s) in RCA: 555] [Impact Index Per Article: 69.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
10
|
Parvinzadeh Gashti M, Bellavance J, Kroukamp O, Wolfaardt G, Taghavi SM, Greener J. Live-streaming: Time-lapse video evidence of novel streamer formation mechanism and varying viscosity. BIOMICROFLUIDICS 2015; 9:041101. [PMID: 26339304 PMCID: PMC4529438 DOI: 10.1063/1.4928296] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Accepted: 07/29/2015] [Indexed: 05/12/2023]
Abstract
Time-lapse videos of growing biofilms were analyzed using a background subtraction method, which removed camouflaging effects from the heterogeneous field of view to reveal evidence of streamer formation from optically dense biofilm segments. In addition, quantitative measurements of biofilm velocity and optical density, combined with mathematical modeling, demonstrated that streamer formation occurred from mature, high-viscosity biofilms. We propose a streamer formation mechanism by sudden partial detachment, as opposed to continuous elongation as observed in other microfluidic studies. Additionally, streamer formation occurred in straight microchannels, as opposed to serpentine or pseudo-porous channels, as previously reported.
Collapse
Affiliation(s)
| | | | - Otini Kroukamp
- Department of Chemistry and Biology, Ryerson University , Toronto, Canada
| | - Gideon Wolfaardt
- Department of Microbiology, Stellenbosch University , Stellenbosch, South Africa
| | | | - Jesse Greener
- Département de Chimie, Université Laval , Québec, Canada
| |
Collapse
|
11
|
Storck T, Picioreanu C, Virdis B, Batstone DJ. Variable cell morphology approach for individual-based modeling of microbial communities. Biophys J 2014; 106:2037-48. [PMID: 24806936 DOI: 10.1016/j.bpj.2014.03.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 02/14/2014] [Accepted: 03/13/2014] [Indexed: 10/25/2022] Open
Abstract
An individual-based, mass-spring modeling framework has been developed to investigate the effect of cell properties on the structure of biofilms and microbial aggregates through Lagrangian modeling. Key features that distinguish this model are variable cell morphology described by a collection of particles connected by springs and a mechanical representation of deformable intracellular, intercellular, and cell-substratum links. A first case study describes the colony formation of a rod-shaped species on a planar substratum. This case shows the importance of mechanical interactions in a community of growing and dividing rod-shaped cells (i.e., bacilli). Cell-substratum links promote formation of mounds as opposed to single-layer biofilms, whereas filial links affect the roundness of the biofilm. A second case study describes the formation of flocs and development of external filaments in a mixed-culture activated sludge community. It is shown by modeling that distinct cell-cell links, microbial morphology, and growth kinetics can lead to excessive filamentous proliferation and interfloc bridging, possible causes for detrimental sludge bulking. This methodology has been extended to more advanced microbial morphologies such as filament branching and proves to be a very powerful tool in determining how fundamental controlling mechanisms determine diverse microbial colony architectures.
Collapse
Affiliation(s)
- Tomas Storck
- Advanced Water Management Centre, The University of Queensland, Brisbane, Australia
| | - Cristian Picioreanu
- Department of Biotechnology, Delft University of Technology, Delft, The Netherlands
| | - Bernardino Virdis
- Advanced Water Management Centre, The University of Queensland, Brisbane, Australia; Centre for Microbial Electrosynthesis, The University of Queensland, St. Lucia, Brisbane, Australia
| | - Damien J Batstone
- Advanced Water Management Centre, The University of Queensland, Brisbane, Australia.
| |
Collapse
|