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Chalotra A, Babbar R, Ratha D, Baranwal M, Rout PR. Assessment of kinetic and statistical models for predicting breakthrough curves of bio-colloid transport through saturated porous media. JOURNAL OF CONTAMINANT HYDROLOGY 2023; 259:104246. [PMID: 37741029 DOI: 10.1016/j.jconhyd.2023.104246] [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: 04/15/2023] [Revised: 09/04/2023] [Accepted: 09/17/2023] [Indexed: 09/25/2023]
Abstract
The microbial contamination of groundwater and its prevention is a widespread concern in developing countries. The present study simulated the transportation and interception of bio-colloid, Escherichia coli in porous media experimentally using packed columns to address certain aspects of underexplored sorption potential and validated using several kinetic models. The breakthrough curves obtained through experiments are observed to be in good agreement with its prediction using kinetic models namely Thomas, Yoon-Nelson and Modified Dose-Response. The overall comparisons of R2 among all the three models suggest that the MDR model fits more perfectly to experimental results. The combined effect of independent factors (column depth, particle size and alumina content) on response factors (maximum relative concentration and time required to achieve peak concentration) was investigated by using Box-Behnken Design under Response Surface Methodology (RSM) to check statistical significancy of independent factors. The R2 values for both response factors are observed to be 0.94 and 0.99, indicating a very high correlation between predicted and actual values. The results obtained in the present study also confirms that the travel distance and particle size are the statistically significant parameters that efficiently impact on sorption of Escherichia coli during their transport whereas the alumina content also affects the sorption but is observed to be a statistically non-significant.
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Affiliation(s)
- Ajay Chalotra
- Department of Civil Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India
| | - Richa Babbar
- Department of Civil Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India.
| | - Dwarikanath Ratha
- Department of Civil Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India.
| | - Manoj Baranwal
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, Punjab 147004, India.
| | - Prangya Ranjan Rout
- Department of Biotechnology, National Institute of Technology Jalandhar, Punjab 144027, India.
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Ramos CH, Rodríguez-Sánchez E, Del Angel JAA, Arzola AV, Benítez M, Escalante AE, Franci A, Volpe G, Rivera-Yoshida N. The environment topography alters the way to multicellularity in Myxococcus xanthus. SCIENCE ADVANCES 2021; 7:7/35/eabh2278. [PMID: 34433567 PMCID: PMC8386931 DOI: 10.1126/sciadv.abh2278] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/02/2021] [Indexed: 05/10/2023]
Abstract
The social soil-dwelling bacterium Myxococcus xanthus can form multicellular structures, known as fruiting bodies. Experiments in homogeneous environments have shown that this process is affected by the physicochemical properties of the substrate, but they have largely neglected the role of complex topographies. We experimentally demonstrate that the topography alters single-cell motility and multicellular organization in M. xanthus In topographies realized by randomly placing silica particles over agar plates, we observe that the cells' interaction with particles drastically modifies the dynamics of cellular aggregation, leading to changes in the number, size, and shape of the fruiting bodies and even to arresting their formation in certain conditions. We further explore this type of cell-particle interaction in a computational model. These results provide fundamental insights into how the environment topography influences the emergence of complex multicellular structures from single cells, which is a fundamental problem of biological, ecological, and medical relevance.
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Affiliation(s)
- Corina H Ramos
- Facultad de Ciencias, Universidad Nacional Autónoma de México, Cd. de México, C.P. 4510, Mexico
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, Mexico
| | - Edna Rodríguez-Sánchez
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, Mexico
| | - Juan Antonio Arias Del Angel
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, Mexico
| | - Alejandro V Arzola
- Instituto de Física, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, México
| | - Mariana Benítez
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, Mexico
| | - Ana E Escalante
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, Mexico
| | - Alessio Franci
- Facultad de Ciencias, Universidad Nacional Autónoma de México, Cd. de México, C.P. 4510, Mexico
| | - Giovanni Volpe
- Department of Physics, University of Gothenburg, Gothenburg, Sweden
| | - Natsuko Rivera-Yoshida
- Facultad de Ciencias, Universidad Nacional Autónoma de México, Cd. de México, C.P. 4510, Mexico.
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Cd. de México, C.P. 04510, Mexico
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Zhang M, He L, Jin X, Bai F, Tong M, Ni J. Flagella and Their Properties Affect the Transport and Deposition Behaviors of Escherichia coli in Quartz Sand. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:4964-4973. [PMID: 33770437 DOI: 10.1021/acs.est.0c08712] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The effects of flagella and their properties on bacterial transport and deposition behaviors were examined by using four types of Escherichia coli (E. coli) with or without flagella, as well as with normal or sticky flagella. Packed column, quartz crystal microbalance with dissipation, visible parallel-plate flow chamber system, and visible flow chamber packed with porous media system were employed to investigate the deposition mechanisms of bacteria with different properties of flagella. We found that the presence of flagella favored E. coli deposition onto quartz sand/silica surfaces. Moreover, by changing the porous media porosity and directly observing the bacterial deposition process, local sites with high roughness, narrow flow channels, and grain-to-grain contacts were found to be the major sites for bacterial deposition. Particularly, flagella could help bacteria swim near and then deposit at these sites. In addition, we found that due to the stronger adhesive forces, sticky flagella could further enhance bacterial deposition onto quartz sand/silica surfaces. Elution experiments indicated that flagella could help bacteria attach onto sand surfaces more irreversibly. Clearly, flagella and their properties would have obvious impacts on the transport/deposition behaviors of bacteria in porous media.
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Affiliation(s)
- Mengya Zhang
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China
| | - Lei He
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China
| | - Xin Jin
- Biomedical Pioneering Innovation Center, School of Life Sciences, Peking University, Beijing 100871, P. R. China
| | - Fan Bai
- Biomedical Pioneering Innovation Center, School of Life Sciences, Peking University, Beijing 100871, P. R. China
| | - Meiping Tong
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China
| | - Jinren Ni
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China
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