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Zhang H, Zhang W, Zong Y, Kong D, Zhao K. Factors Influencing Pseudomonas aeruginosa Initial Adhesion and Evolution at the Dodecane-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11274-11282. [PMID: 37524061 DOI: 10.1021/acs.langmuir.3c00901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Bacterial adhesion and evolution at the oil-water interface are important for a broad range of applications such as food manufacturing and microbial-enhanced oil recovery, etc. However, our understanding on bacterial interfacial adhesion and evolution, particularly at the single-cell level, is still far from complete. In this work, by employing Pseudomonas aeruginosa PAO1 at the dodecane-water interface as a model system, we have studied the effects of different factors on bacterial interfacial adhesion and the dynamic evolution of bacterial interfacial behavior at the single-cell level. The results show that PAO1 cells displayed a chemotactic behavior toward dodecane. Among the tested factors, bacterial initial interfacial attachment showed a negative correlation with the secreted cell-surface associated lipopolysaccharide and Psl while a positive correlation with type IV pili. Adding nonbiological surfactant Pluronic F-127, as expected, greatly reduced the cell interfacial adhesion. More importantly, the dynamics analysis of cell attachment/detachment at the dodecane-water interface over a long-time scale revealed a reversible to irreversible attachment transition of cells. This transition is accompanied with the interface aging resulting from bacterial activities, which led to an increase of the interfacial viscoelasticity with time and finally the formation of the gel-like interface. Further analysis demonstrated the important role of exopolysaccharides in the latter process. Our findings provide more details of bacterial oil-water interfacial behavior at the single-cell level and may shed light on developing new strategies for controlling bacterial colonization at the oil-water interface.
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Affiliation(s)
- Hong Zhang
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Wenchao Zhang
- School of Chemistry and Life Science, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Yiwu Zong
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Dongyang Kong
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin 300072, China
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Kun Zhao
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
- The Sichuan Provincial Key Laboratory for Human Disease Gene Study and The Institute of Laboratory Medicine, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
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2
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Nguyen D, Balasubramanian R, Richardson A. Adhesion energy, spreading coefficient and interfacial tension as an efficient tool for assessing biocide performance. J SURFACTANTS DETERG 2022. [DOI: 10.1002/jsde.12639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Effects of Adding Laccase to Bacterial Consortia Degrading Heavy Oil. Processes (Basel) 2021. [DOI: 10.3390/pr9112025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
High-efficiency bioremediation technology for heavy oil pollution has been a popular research topic in recent years. Laccase is very promising for the remediation of heavy oil pollution because it can not only convert bio-refractory hydrocarbons into less toxic or completely harmless compounds, but also accelerate the biodegradation efficiency of heavy oil. However, there are few reports on the use of laccase to enhance the biodegradation of heavy oil. In this study, we investigated the effect of laccase on the bacterial consortia degradation of heavy oil. The degradation efficiencies of bacterial consortia and the laccase-bacterial consortia were 60.6 ± 0.1% and 68.2 ± 0.6%, respectively, and the corresponding heavy oil degradation rate constants were 0.112 day−1 and 0.198 day−1, respectively. The addition of laccase increased the heavy oil biodegradation efficiency (p < 0.05) and biodegradation rate of the bacterial consortia. Moreover, gas chromatography–mass spectrometry analysis showed that the biodegradation efficiencies of the laccase-bacterial consortia for saturated hydrocarbons and aromatic hydrocarbons were 82.5 ± 0.7% and 76.2 ± 0.9%, respectively, which were 16.0 ± 0.3% and 13.0 ± 1.8% higher than those of the bacterial consortia, respectively. In addition, the degradation rate constants of the laccase-bacterial consortia for saturated hydrocarbons and aromatic hydrocarbons were 0.267 day−1 and 0.226 day−1, respectively, which were 1.07 and 1.15 times higher than those of the bacterial consortia, respectively. The degradation of C15 to C35 n-alkanes and 2 to 5-ring polycyclic aromatic hydrocarbons by laccase-bacterial consortia was higher than individual bacterial consortia. It is further seen that the addition of laccase significantly improved the biodegradation of long-chain n-alkanes of C22–C35 (p < 0.05). Overall, this study shows that the combination of laccase and bacterial consortia is an effective remediation technology for heavy oil pollution. Adding laccase can significantly improve the heavy oil biodegradation efficiency and biodegradation rate of the bacterial consortia.
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4
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Filgueira D, Bolaño C, Gouveia S, Moldes D. Enzymatic Functionalization of Wood as an Antifouling Strategy against the Marine Bacterium Cobetia marina. Polymers (Basel) 2021; 13:3795. [PMID: 34771352 PMCID: PMC8587834 DOI: 10.3390/polym13213795] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 10/28/2021] [Accepted: 10/29/2021] [Indexed: 11/16/2022] Open
Abstract
The protection of wood in marine environments is a major challenge due to the high sensitivity of wood to both water and marine microorganisms. Besides, the environmental regulations are pushing the industry to develop novel effective and environmentally friendly treatments to protect wood in marine environments. The present study focused on the development of a new green methodology based on the laccase-assisted grafting of lauryl gallate (LG) onto wood to improve its marine antifouling properties. Initially, the enzymatic treatment conditions (laccase dose, time of reaction, LG concentration) and the effect of the wood specie (beech, pine, and eucalyptus) were assessed by water contact angle (WCA) measurements. The surface properties of the enzymatically modified wood veneers were assessed by X-ray photoelectron spectroscopy (XPS), Fourier transform-infrared spectroscopy (FTIR). Antifouling properties of the functionalized wood veneers against marine bacterium Cobetia marina were studied by scanning electron microscopy (SEM) and protein measurements. XPS and FTIR analysis suggested the stable grafting of LG onto the surface of wood veneers after laccase-assisted treatment. WCA measurements showed that the hydrophobicity of the wood veneers significantly increased after the enzymatic treatment. Protein measurements and SEM pictures showed that enzymatically-hydrophobized wood veneers modified the pattern of bacterial attachment and remarkably reduced the bacterium colonization. Thus, the results observed in the present study confirmed the potential efficiency of laccase-assisted treatments to improve the marine antifouling properties of wood.
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Affiliation(s)
- Daniel Filgueira
- CINTECX, Department of Chemical Engineering, Campus Universitario as Lagoas-Marcosende, Universidade de Vigo, 36310 Vigo, Spain; (D.F.); (C.B.); (S.G.)
- TECNALIA, Basque Research and Technology Alliance (BRTA), Area Anardi 5, 20730 Azpeitia, Spain
| | - Cristian Bolaño
- CINTECX, Department of Chemical Engineering, Campus Universitario as Lagoas-Marcosende, Universidade de Vigo, 36310 Vigo, Spain; (D.F.); (C.B.); (S.G.)
| | - Susana Gouveia
- CINTECX, Department of Chemical Engineering, Campus Universitario as Lagoas-Marcosende, Universidade de Vigo, 36310 Vigo, Spain; (D.F.); (C.B.); (S.G.)
| | - Diego Moldes
- CINTECX, Department of Chemical Engineering, Campus Universitario as Lagoas-Marcosende, Universidade de Vigo, 36310 Vigo, Spain; (D.F.); (C.B.); (S.G.)
- Research Group of Bioengineering and Sustainable Processes, Department of Chemical Engineering, Edificio Fundición, Lagoas Marcosende s/n, University of Vigo, 36310 Vigo, Spain
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5
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Akbari A, David C, Rahim AA, Ghoshal S. Salt selected for hydrocarbon-degrading bacteria and enhanced hydrocarbon biodegradation in slurry bioreactors. WATER RESEARCH 2021; 202:117424. [PMID: 34332190 DOI: 10.1016/j.watres.2021.117424] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 06/12/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
Hydrocarbon and salt contamination of surface and groundwater resources often co-occur from oil production activities. However, salt is often considered as a potential inhibitor of microbial activity. The feasibility of microbiome-based biotechnologies to treat the hydrocarbon contamination is contingent on the ability of the indigenous community to adapt to saline conditions. Here, we demonstrate enhanced hydrocarbon biodegradation in soil slurries under saline conditions of up to ~1 M (5%) compared to non-saline systems and the underlying causes. The mineralization extent of hexadecane was enhanced by salinity in the absence of nutrients. Salinity, similar to nutrients, enhanced the mineralization but through ecological selection. Microbial community analysis indicated a significant enrichment of Actinobacteria phylum and an increase in the absolute abundance of the hydrocarbon-degrading Dietzia genus, but a decrease in the total population size with salinity. Moreover, the in situ expression of alkane hydroxylases genes of Dietzia was generally increased with salinity. The data demonstrate that indigenous halotolerant hydrocarbon degraders were enriched, and their hydrocarbon degradation genes upregulated under saline conditions. These findings have positive implications for engineered biotreatment approaches for hydrocarbons in saline environments such as those affected with produced waters and oil sands tailing ponds.
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Affiliation(s)
- Ali Akbari
- Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada
| | - Carolyn David
- Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada
| | - Arshath Abdul Rahim
- Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada
| | - Subhasis Ghoshal
- Department of Civil Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada.
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Biophysical methods to quantify bacterial behaviors at oil-water interfaces. J Ind Microbiol Biotechnol 2020; 47:725-738. [PMID: 32743734 DOI: 10.1007/s10295-020-02293-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Accepted: 07/16/2020] [Indexed: 02/03/2023]
Abstract
Motivated by the need for improved understanding of physical processes involved in bacterial biodegradation of catastrophic oil spills, we review biophysical methods to probe bacterial motility and adhesion at oil-water interfaces. This review summarizes methods that probe bulk, average behaviors as well as local, microscopic behaviors, and highlights opportunities for future work to bridge the gap between biodegradation and biophysics.
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7
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Shen Y, Huang DM, Chen YP, Yan P, Gao X. New insight into filamentous sludge bulking during wastewater treatment: Surface characteristics and thermodynamics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 712:135795. [PMID: 31866048 DOI: 10.1016/j.scitotenv.2019.135795] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/22/2019] [Accepted: 11/25/2019] [Indexed: 06/10/2023]
Abstract
Although there have been many studies on filamentary bulking of activated sludge, it has been revealed that there is still a gap in the microscopic mechanism of filamentary bulking. In this study, the surface characteristics and thermodynamics of sludge floc were investigated to reveal the mechanism of filamentous sludge bulking. The results showed that the EPS content gradually decreased from 71.09 mg/g VSS to 40.00 mg/g VSS and the protein (PN) content of the EPS significantly decreased from 64.10 mg/g VSS to 35.85 mg/g VSS during sludge bulking. The variation in the EPS and its components led to a decrease in the relative hydrophobicity of sludge and an increase in surface negative charge; then, deterioration of the flocculation setteability of sludge flocs occurred. The electric double layer (WR) was the main force determining the aggregation of sludge during sludge bulking. The total energy of the interaction (WT) increased during sludge bulking, which led to an increase in the difficulty of sludge accumulation. This study is useful for understanding the filamentous bulking of sludge within an activated sludge process.
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Affiliation(s)
- Yu Shen
- National Research Base of Intelligent Manufacturing Service, Chongqing Key Laboratory of Catalysis and New Environmental Materials, Chongqing Technology and Business University, Chongqing 400067, China; Chongqing South-to-Thais Environmental Protection Technology Research Institute Co., Ltd., Chongqing 400067, China
| | - Dong-Mei Huang
- National Research Base of Intelligent Manufacturing Service, Chongqing Key Laboratory of Catalysis and New Environmental Materials, Chongqing Technology and Business University, Chongqing 400067, China; Chongqing South-to-Thais Environmental Protection Technology Research Institute Co., Ltd., Chongqing 400067, China
| | - You-Peng Chen
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China
| | - Peng Yan
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
| | - Xu Gao
- National Research Base of Intelligent Manufacturing Service, Chongqing Key Laboratory of Catalysis and New Environmental Materials, Chongqing Technology and Business University, Chongqing 400067, China
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8
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Qi L, Christopher GF. Role of Flagella, Type IV Pili, Biosurfactants, and Extracellular Polymeric Substance Polysaccharides on the Formation of Pellicles by Pseudomonas aeruginosa. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5294-5304. [PMID: 30883129 DOI: 10.1021/acs.langmuir.9b00271] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Microbial biofilms are viscoelastic materials formed by bacteria, which occur on solid surfaces, at liquid interfaces, or in free solution. Although solid surface biofilms have been widely studied, pellicles, biofilms at liquid interfaces, have had significantly less focus. In this work, interfacial shear rheology and scanning electron microscopy imaging are used to characterize how flagella, type IV pili, biosurfactants, and extracellular polymeric substance polysaccharides affect the formation of pellicles by Pseudomonas aeruginosa at an air/water interface. Pellicles still form with the loss of a single biological attachment mechanism, which is hypothesized to be due to surface tension-aided attachment. Changes in the surface structure of the pellicles are observed when changing both the function/structure of type IV pili, removing the flagella, or stopping the expression of biosurfactants. However, these changes do not appear to affect pellicle elasticity in a consistent way. Traits that affect adsorption and growth/spreading appear to affect pellicles in a manner consistent with literature results for solid surface biofilms; small differences are seen in attachment-related mechanisms, which may occur due to surface tension.
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Affiliation(s)
- Lingjuan Qi
- Department of Mechanical Engineering , Texas Tech University , Lubbock 79409 , United States
| | - Gordon F Christopher
- Department of Mechanical Engineering , Texas Tech University , Lubbock 79409 , United States
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9
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Desai N, Shaik VA, Ardekani AM. Hydrodynamics-mediated trapping of micro-swimmers near drops. SOFT MATTER 2018; 14:264-278. [PMID: 29239442 DOI: 10.1039/c7sm01615h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this paper, we investigate the swimming characteristics and dynamics of a model micro-swimmer in the vicinity of a clean drop, and of a surfactant covered drop. We model the swimmer as a force dipole and utilize the image-singularity system to study the dynamical behavior of the swimmer. Motivated by bacterial bio-remediation of insoluble hydrocarbons (HCs) released during oil spills, we report the 'trapping characteristics' - critical trapping radius, basin of attraction and trapping time distribution - of deterministic and stochastic swimmers, as a function of viscosity ratio, and dimensionless surface viscosity. We find that addition of surfactant reduces the critical trapping radius of a drop by ∼30%. The basin of attraction though, is not affected acutely for any combination in the parameter space of viscosity ratio and surface viscosity. We also carry out a dynamical system analysis of our problem, for deterministic swimmers, to clarify the aforementioned concepts. For hydrodynamics combined with diffusion based motion, we note increments ranging from ∼5-25% in the interface-retention times of surfactant-laden drops, as compared to clean drops. These differences occur for low values of surface viscosity, and saturate rapidly as the surface viscosity increases. With potential applications in bioremediation, our results highlight the importance of considering dispersant-addition in oil spills involving insoluble hydrocarbons.
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Affiliation(s)
- Nikhil Desai
- School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
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10
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Ismail WA, Mohamed ME, Awadh MN, Obuekwe C, El Nayal AM. Simultaneous valorization and biocatalytic upgrading of heavy vacuum gas oil by the biosurfactant-producing Pseudomonas aeruginosa AK6U. Microb Biotechnol 2017; 10:1628-1639. [PMID: 28695623 PMCID: PMC5658591 DOI: 10.1111/1751-7915.12741] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 05/15/2017] [Accepted: 05/16/2017] [Indexed: 11/28/2022] Open
Abstract
Heavy vacuum gas oil (HVGO) is a complex and viscous hydrocarbon stream that is produced as the bottom side product from the vacuum distillation units in petroleum refineries. HVGO is conventionally treated with thermochemical process, which is costly and environmentally polluting. Here, we investigate two petroleum biotechnology applications, namely valorization and bioupgrading, as green approaches for valorization and upgrading of HVGO. The Pseudomonas aeruginosa AK6U strain grew on 20% v/v of HVGO as a sole carbon and sulfur source. It produced rhamnolipid biosurfactants in a growth-associated mode with a maximum crude biosurfactants yield of 10.1 g l-1 , which reduced the surface tension of the cell-free culture supernatant to 30.6 mN m-1 within 1 week of incubation. The rarely occurring dirhamnolipid Rha-Rha-C12 -C12 dominated the congeners' profile of the biosurfactants produced from HVGO. Heavy vacuum gas oil was recovered from the cultures and abiotic controls and the maltene fraction was extracted for further analysis. Fractional distillation (SimDist) of the biotreated maltene fraction showed a relative decrease in the high-boiling heavy fuel fraction (BP 426-565 °C) concomitant with increase in the lighter distillate diesel fraction (BP 315-426 °C). Analysis of the maltene fraction revealed compositional changes. The number-average (Mn) and weight-average (Mw) molecular weights, as well as the absolute number of hydrocarbons and sulfur heterocycles were higher in the biotreated maltene fraction of HVGO. These findings suggest that HVGO can be potentially exploited as a carbon-rich substrate for production of the high-value biosurfactants by P. aeruginosa AK6U and to concomitantly improve/upgrade its chemical composition.
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Affiliation(s)
- Wael Ahmed Ismail
- Environmental Biotechnology ProgramLife Sciences DepartmentCollege of Graduate StudiesArabian Gulf UniversityManamaKingdom of Bahrain
| | | | - Maysoon N. Awadh
- Environmental Biotechnology ProgramLife Sciences DepartmentCollege of Graduate StudiesArabian Gulf UniversityManamaKingdom of Bahrain
| | - Christian Obuekwe
- Department of Biological SciencesCollege of ScienceKuwait UniversityKuwaitKuwait
| | - Ashraf M. El Nayal
- Environmental Biotechnology ProgramLife Sciences DepartmentCollege of Graduate StudiesArabian Gulf UniversityManamaKingdom of Bahrain
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11
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Zhang Y, Liu J, Huang X, Lu L, Peng K. Chemically modified surface functional groups of Alcaligenes sp. S-XJ-1 to enhance its demulsifying capability. Appl Microbiol Biotechnol 2017; 101:3839-3848. [PMID: 28091790 DOI: 10.1007/s00253-017-8111-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 12/20/2016] [Accepted: 12/29/2016] [Indexed: 11/30/2022]
Abstract
Cell-surface functional groups (amino, carboxyl, hydroxyl, as well as phosphate) were chemically modified in various ways to enhance the demulsification capability of the demulsifying bacteria Alcaligenes sp. S-XJ-1. Results demonstrated that the demulsifying activity was significantly inhibited by amino enrichment with cetyl trimethyl ammonium bromide, amino methylation, hydroxyl acetylation, and phosphate esterification, but was gradually promoted by carboxyl blocking with increasing the extents of esterification. Compared with the raw biomass, an optimal esterification of carboxyl moieties enhanced the demulsification ratio by 26.5% and shortened the emulsion half-life from 24 to 8.8 h. The demulsification boost was found to be dominated by strengthened hydrophobicity (from 53° to 74°) and weakened electronegativity (from -34.6 to -4.3 mV at pH 7.0) of the cell surface, allowing the rapid dispersion and adsorption of cells onto the oil-water interface. The chemical modification of the functional groups on the biomass surface is a promising tool for the creation of a high-performance bacterial demulsifier.
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Affiliation(s)
- Yuyan Zhang
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education, Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai, 200092, China
| | - Jia Liu
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education, Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai, 200092, China
| | - Xiangfeng Huang
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education, Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai, 200092, China
| | - Lijun Lu
- College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Ministry of Education, Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai, 200092, China
| | - Kaiming Peng
- Post-Doctoral Research Station, Tongji University, Shanghai, 200092, China.
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12
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Melvin AT, Thibodeaux LJ, Parsons AR, Overton E, Valsaraj KT, Nandakumar K. Oil-material fractionation in Gulf deep water horizontal intrusion layer: Field data analysis with chemodynamic fate model for Macondo 252 oil spill. MARINE POLLUTION BULLETIN 2016; 105:110-119. [PMID: 26947926 DOI: 10.1016/j.marpolbul.2016.02.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 02/18/2016] [Indexed: 06/05/2023]
Abstract
Among the discoveries of the Deepwater Horizon blowout was the so-called "sub-surface plume"; herein termed the "oil-trapping layer". Hydrocarbons were found positioned at ~1100-1300m with thickness ~100-150m and moving horizontally to the SW in a vertically stratified layer at the junction of the cold abyssal water and the permanent thermocline. This study focuses on its formation process and fate of the hydrocarbons within. The originality of this work to the field is two-fold, first it provides a conceptual framework which places layer origin in the context of a horizontal "intrusion" from the near-field, vertical, blow-out plume and second, it offers a theoretical model for the hydrocarbon chemicals within the horizontal layer as it moves far-afield. The model quantifies the oil-material fractionation process for the soluble and fine particle. The classical Box model, retrofitted with an internal gradient, the "G-Box", allows an approach that includes turbulent eddy diffusion coupled with droplet rise velocity and reactive decay to produce a simple, explicit, transparent, algebraic model with few parameters for the fate of the individual fractions. Computations show the soluble and smallest liquid droplets moving very slowly vertically through the layer appearing within the trapping layer at low concentration with high persistence. The larger droplets move-through this trapping zone quickly, attain high concentrations, and eventually form the sea surface slick. It impacts the field of oil spill engineering science by providing the conceptual idea and the algorithms for projecting the quantities and fractions of oil-material in a deep water, horizontal marine current being dispersed and moving far afield. In the field of oil spill modeling this work extends the current generation near-field plume source models to the far-field. The theory portrays the layer as an efficient oil-material trap. The model-forecasted concentration profiles for alkanes and aromatics against the available field data support the proposed theory and the resulting model.
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Affiliation(s)
- A T Melvin
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, United States
| | - L J Thibodeaux
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, United States.
| | - A R Parsons
- National Oceanographic Data Center, National Oceanic and Atmospheric Administration, Washington, DC, United States
| | - E Overton
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA, United States
| | - K T Valsaraj
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, United States
| | - K Nandakumar
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, United States
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13
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Zhang Z, Christopher G. Effect of Particulate Contaminants on the Development of Biofilms at Air/Water Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2724-30. [PMID: 26943272 DOI: 10.1021/acs.langmuir.6b00143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The development of biofilms at air/water or oil/water interfaces has important ramifications on several applications, but it has received less attention than biofilm formation on solid surfaces. A key difference between the growth of biofilms on solid surfaces versus liquid interfaces is the range of complicated boundary conditions the liquid interface can create that may affect bacteria, as they adsorb onto and grow on the interface. This situation is exacerbated by the existence of complex interfaces in which interfacially adsorbed components can even more greatly affect interfacial boundary conditions. In this work, we present evidence as to how particle-laden interfaces impact biofilm growth at an air/water interface. We find that particles can enhance the rate of growth and final strength of biofilms at liquid interfaces by providing sites of increased adhesive strength for bacteria. The increased adhesion stems from creating localized areas of hydrophobicity that protrude in the water phase and provide sites where bacteria preferentially adhere. This mechanism is found to be primarily controlled by particle composition, with particle size providing a secondary effect. This increased adhesion through interfacial conditions creates biofilms with properties similar to those observed when adhesion is increased through biological means. Because of the generally understood ubiquity of increased bacteria attachment to hydrophobic surfaces, this result has general applicability to pellicle formation for many pellicle-forming bacteria.
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Affiliation(s)
- Zhenhuan Zhang
- Department of Mechanical Engineering, Texas Tech University , Lubbock, Texas 79409-1035, United States
| | - Gordon Christopher
- Department of Mechanical Engineering, Texas Tech University , Lubbock, Texas 79409-1035, United States
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14
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Huang X, Zhang Y, Wei Y, Liu J, Lu L, Peng K. Saponin-enhanced biomass accumulation and demulsification capability of the demulsifying bacteria Alcaligenes sp. S-XJ-1. RSC Adv 2016. [DOI: 10.1039/c6ra02237e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Saponin significantly enhanced biomass accumulation and demulsification capability of the demulsifying bacteria.
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Affiliation(s)
- Xiangfeng Huang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Yuyan Zhang
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Yansong Wei
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Jia Liu
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
| | - Lijun Lu
- College of Environmental Science and Engineering
- State Key Laboratory of Pollution Control and Resource Reuse
- Ministry of Education Key Laboratory of Yangtze River Water Environment
- Tongji University
- Shanghai 200092
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15
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Vaccari L, Allan DB, Sharifi-Mood N, Singh AR, Leheny RL, Stebe KJ. Films of bacteria at interfaces: three stages of behaviour. SOFT MATTER 2015; 11:6062-6074. [PMID: 26135879 DOI: 10.1039/c5sm00696a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report an investigation of the formation of films by bacteria at an oil-water interface using a combination of particle tracking and pendant drop elastometry. The films display a remarkably varied series of dynamical and mechanical properties as they evolve over the course of minutes to hours following the creation of an initially pristine interface. At the earliest stage of formation, which we interrogate using dispersions of colloidal probes, the interface is populated with motile bacteria. Interactions with the bacteria dominate the colloidal motion, and the interface displays canonical features of active matter in a quasi-two-dimensional context. This active stage gives way to a viscoelastic transition, presumably driven by the accumulation at the interface of polysaccharides and surfactants produced by the bacteria, which instill the interface with the hallmarks of soft glassy rheology that we characterize with microrheology. Eventually, the viscoelastic film becomes fully elastic with the capability to support wrinkling upon compression, and we investigate this final stage with the pendant drop measurements. We characterize quantitatively the dynamic and mechanical properties of the films during each of these three stages - active, viscoelastic, and elastic - and comment on their possible significance for the interfacial bacterial colony. This work also brings to the forefront the important role that interfacial mechanics may play in bacterial suspensions with free surfaces.
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Affiliation(s)
- Liana Vaccari
- Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
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16
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Zhao P, Quan C, Jin L, Wang L, Wang J, Fan S. Effects of critical medium components on the production of antifungal lipopeptides from Bacillus amyloliquefaciens Q-426 exhibiting excellent biosurfactant properties. World J Microbiol Biotechnol 2013; 29:401-9. [PMID: 23329061 DOI: 10.1007/s11274-012-1180-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 09/24/2012] [Indexed: 11/26/2022]
Abstract
In this study, influence of three critical parameters nitrogen sources, initial pH and metal ions was discussed in the production of antifungal lipopeptides from Bacillus amyloliquefaciens Q-426. The results revealed that lipopeptide biosynthesis might have relations with the population density of strain Q-426 and some special amino acids. Also, the alkali-resistant strain Q-426 could grow well in the presence of Fe(2+) ions below 0.8 M l(-1) and still maintain the competitive advantage below 0.2 M l(-1). Moreover, lipopeptides exhibited significant inhibitory activities against Curvularia lunata (Walk) Boed even at the extreme conditions of temperature, pH and salinity. Finally, biosurfactant properties of lipopeptides mixture were evaluated by use with totally six different methods including bacterial adhesion to hydrocarbons assay, lipase activity, hemolytic activity, emulsification activity, oil displacement test and surface tension measurement. The research suggested that B. amyloliquefaciens Q-426 may have great potential in agricultural and environmental fields.
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Affiliation(s)
- Pengchao Zhao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhong-shan Road, Dalian 116023, China.
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17
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Kryachko Y, Dong X, Sensen CW, Voordouw G. Compositions of microbial communities associated with oil and water in a mesothermic oil field. Antonie van Leeuwenhoek 2011; 101:493-506. [DOI: 10.1007/s10482-011-9658-y] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 10/11/2011] [Indexed: 10/15/2022]
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18
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Abbasnezhad H, Gray M, Foght JM. Influence of adhesion on aerobic biodegradation and bioremediation of liquid hydrocarbons. Appl Microbiol Biotechnol 2011; 92:653-75. [DOI: 10.1007/s00253-011-3589-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Revised: 08/27/2011] [Accepted: 09/15/2011] [Indexed: 01/14/2023]
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