151
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Chan XY, How KY, Yin WF, Chan KG. N-Acyl Homoserine Lactone-Mediated Quorum Sensing in Aeromonas veronii biovar sobria Strain 159: Identification of LuxRI Homologs. Front Cell Infect Microbiol 2016; 6:7. [PMID: 26909339 PMCID: PMC4754395 DOI: 10.3389/fcimb.2016.00007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 01/14/2016] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xin-Yue Chan
- Division of Genetics and Molecular Biology, Faculty of Science, Institute of Biological Sciences, University of Malaya Kuala Lumpur, Malaysia
| | - Kah-Yan How
- Division of Genetics and Molecular Biology, Faculty of Science, Institute of Biological Sciences, University of Malaya Kuala Lumpur, Malaysia
| | - Wai-Fong Yin
- Division of Genetics and Molecular Biology, Faculty of Science, Institute of Biological Sciences, University of Malaya Kuala Lumpur, Malaysia
| | - Kok-Gan Chan
- Division of Genetics and Molecular Biology, Faculty of Science, Institute of Biological Sciences, University of Malaya Kuala Lumpur, Malaysia
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152
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Tan LR, Xia PF, Sun XF, Guo N, Song C, Li Q, Wang SG. Ecological insights into low-level antibiotics interfered biofilms of Synechococcus elongatus. RSC Adv 2016. [DOI: 10.1039/c6ra15025j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The ecological impacts of low-level kanamycin onS. elongatushave been investigated through combined biofilm formation and transcriptional analysis.
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Affiliation(s)
- Lin-Rui Tan
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
| | - Peng-Fei Xia
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
| | - Xue-Fei Sun
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
| | - Ning Guo
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
| | - Chao Song
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
| | - Qian Li
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
| | - Shu-Guang Wang
- School of Environmental Science and Engineering
- Shandong University
- Jinan
- P. R. China
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153
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Hu H, He J, Liu J, Yu H, Tang J, Zhang J. Role of N-acyl-homoserine lactone (AHL) based quorum sensing on biofilm formation on packing media in wastewater treatment process. RSC Adv 2016. [DOI: 10.1039/c5ra23466b] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Quorum sensing (QS) signaling has been extensively studied in granules and single species populations.
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Affiliation(s)
- Huizhi Hu
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Junguo He
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Jian Liu
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Huarong Yu
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Jian Tang
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Jie Zhang
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin
- China
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154
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Microbial Surface Colonization and Biofilm Development in Marine Environments. Microbiol Mol Biol Rev 2015; 80:91-138. [PMID: 26700108 DOI: 10.1128/mmbr.00037-15] [Citation(s) in RCA: 462] [Impact Index Per Article: 51.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Biotic and abiotic surfaces in marine waters are rapidly colonized by microorganisms. Surface colonization and subsequent biofilm formation and development provide numerous advantages to these organisms and support critical ecological and biogeochemical functions in the changing marine environment. Microbial surface association also contributes to deleterious effects such as biofouling, biocorrosion, and the persistence and transmission of harmful or pathogenic microorganisms and their genetic determinants. The processes and mechanisms of colonization as well as key players among the surface-associated microbiota have been studied for several decades. Accumulating evidence indicates that specific cell-surface, cell-cell, and interpopulation interactions shape the composition, structure, spatiotemporal dynamics, and functions of surface-associated microbial communities. Several key microbial processes and mechanisms, including (i) surface, population, and community sensing and signaling, (ii) intraspecies and interspecies communication and interaction, and (iii) the regulatory balance between cooperation and competition, have been identified as critical for the microbial surface association lifestyle. In this review, recent progress in the study of marine microbial surface colonization and biofilm development is synthesized and discussed. Major gaps in our knowledge remain. We pose questions for targeted investigation of surface-specific community-level microbial features, answers to which would advance our understanding of surface-associated microbial community ecology and the biogeochemical functions of these communities at levels from molecular mechanistic details through systems biological integration.
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155
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Ding Y, Feng H, Huang W, Li N, Zhou Y, Wang M, Zhang X, Shen D. The effect of quorum sensing on anaerobic granular sludge in different pH conditions. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2015.08.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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156
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Ding Y, Feng H, Huang W, Shen D, Wang M. A sustainable method for effective regulation of anaerobic granular sludge: artificially increasing the concentration of signal molecules by cultivating a secreting strain. BIORESOURCE TECHNOLOGY 2015; 196:273-278. [PMID: 26253911 DOI: 10.1016/j.biortech.2015.07.066] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/17/2015] [Accepted: 07/20/2015] [Indexed: 06/04/2023]
Abstract
This study introduces sustainable quorum sensing (QS) granulation for anaerobic granular sludge (AnGS) and investigates the efficiency of three types of signal molecules on regulating AnGS granulation. The signal molecules of a secreting strain cultured in a QS regulating reactor increased their concentrations in an expanded granular sludge bed reactor throughout the granulating process. Increasing content of autoinducer-2 (AI-2) strengthened interspecific QS communication and gave a best performance with larger granular diameters, higher extracellular polymeric substance (EPS) production and relative hydrophobicity (RH). N-butyryl-homoserine lactone (C4-HSL) QS regulation was also favorable for granular growth, but its regulation was less than that of AI-2-QS. The AnGS granulated under these two types of QS regulations guided more filamentous bacteria to take part in granulation. Under diffusible signal factor (DSF)-QS regulation, the sludge had a lower granular level with a smaller granule diameter, lower EPS production (RH) when compared that of control medium.
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Affiliation(s)
- Yangcheng Ding
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Huajun Feng
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Hangzhou 310012, China.
| | - Wenkun Huang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Dongsheng Shen
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Meizhen Wang
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Hangzhou 310012, China
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157
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Wonoputri V, Gunawan C, Liu S, Barraud N, Yee LH, Lim M, Amal R. Copper Complex in Poly(vinyl chloride) as a Nitric Oxide-Generating Catalyst for the Control of Nitrifying Bacterial Biofilms. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22148-22156. [PMID: 26418515 DOI: 10.1021/acsami.5b07971] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this study, catalytic generation of nitric oxide by a copper(II) complex embedded within a poly(vinyl chloride) matrix in the presence of nitrite (source of nitric oxide) and ascorbic acid (reducing agent) was shown to effectively control the formation and dispersion of nitrifying bacteria biofilms. Amperometric measurements indicated increased and prolonged generation of nitric oxide with the addition of the copper complex when compared to that with nitrite and ascorbic acid alone. The effectiveness of the copper complex-nitrite-ascorbic acid system for biofilm control was quantified using protein analysis, which showed enhanced biofilm suppression when the copper complex was used in comparison to that with nitrite and ascorbic acid treatment alone. Confocal laser scanning microscopy (CLSM) and LIVE/DEAD staining revealed a reduction in cell surface coverage without a loss of viability with the copper complex and up to 5 mM of nitrite and ascorbic acid, suggesting that the nitric oxide generated from the system inhibits proliferation of the cells on surfaces. Induction of nitric oxide production by the copper complex system also triggered the dispersal of pre-established biofilms. However, the addition of a high concentration of nitrite and ascorbic acid to a pre-established biofilm induced bacterial membrane damage and strongly decreased the metabolic activity of planktonic and biofilm cells, as revealed by CLSM with LIVE/DEAD staining and intracellular adenosine triphosphate measurements, respectively. This study highlights the utility of the catalytic generation of nitric oxide for the long-term suppression and removal of nitrifying bacterial biofilms.
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Affiliation(s)
- Vita Wonoputri
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales , Sydney, NSW 2052, Australia
| | - Cindy Gunawan
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales , Sydney, NSW 2052, Australia
- ithree Institute, University of Technology Sydney , Sydney, NSW 2007, Australia
| | - Sanly Liu
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales , Sydney, NSW 2052, Australia
| | - Nicolas Barraud
- Centre for Marine Bio-Innovation, The University of New South Wales , Sydney, NSW 2052, Australia
| | - Lachlan H Yee
- Marine Ecology Research Centre in the School of Environment, Science and Engineering, Southern Cross University , Lismore, NSW 2480, Australia
| | - May Lim
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales , Sydney, NSW 2052, Australia
| | - Rose Amal
- Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales , Sydney, NSW 2052, Australia
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158
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Song S, Du L, Yu J, Ai Q, Pan Y, Fu Y, Wang Z. Does Streptococcus mitis, a neonatal oropharyngeal bacterium, influence the pathogenicity of Pseudomonas aeruginosa? Microbes Infect 2015; 17:710-6. [DOI: 10.1016/j.micinf.2015.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 08/04/2015] [Accepted: 08/04/2015] [Indexed: 10/23/2022]
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159
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Ding Z, Bourven I, Guibaud G, van Hullebusch ED, Panico A, Pirozzi F, Esposito G. Role of extracellular polymeric substances (EPS) production in bioaggregation: application to wastewater treatment. Appl Microbiol Biotechnol 2015; 99:9883-905. [DOI: 10.1007/s00253-015-6964-8] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 08/23/2015] [Accepted: 08/26/2015] [Indexed: 11/28/2022]
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160
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Zhu SM, Deng YL, Ruan YJ, Guo XS, Shi MM, Shen JZ. Biological denitrification using poly(butylene succinate) as carbon source and biofilm carrier for recirculating aquaculture system effluent treatment. BIORESOURCE TECHNOLOGY 2015; 192:603-610. [PMID: 26093254 DOI: 10.1016/j.biortech.2015.06.021] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/02/2015] [Accepted: 06/04/2015] [Indexed: 06/04/2023]
Abstract
Nitrate removal is essential for the sustainable operation of recirculating aquaculture system (RAS). This study evaluated the heterotrophic denitrification using poly(butylene succinate) as carbon source and biofilm carrier for RAS wastewater treatment. The effect of varied operational conditions (influent type, salinity and nitrate loading) on reactor performance and microbial community was investigated. The high denitrification rates of 0.53 ± 0.19 kg NO3(-)-N m(-3) d(-1) (salinity, 0‰) and 0.66 ± 0.12 kg NO3(-)-Nm(-3) d(-1) (salinity, 25‰) were achieved, and nitrite concentration was maintained below 1mg/L. In addition, the existence of salinity exhibited more stable nitrate removal efficiency, but caused adverse effects such as excessive effluent dissolved organic carbon (DOC) and dissimilation nitrate reduce to ammonia (DNRA) activity. The degradation of PBS was further confirmed by SEM and FTIR analysis. Illumina sequencing revealed the abundance and species changes of functional denitrification and degradation microflora which might be the primary cause of varied reactor performance.
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Affiliation(s)
- Song-Ming Zhu
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Ya-Le Deng
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Yun-Jie Ruan
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
| | - Xi-Shan Guo
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Ming-Ming Shi
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
| | - Jia-Zheng Shen
- Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
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161
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Maqbool T, Khan SJ, Waheed H, Lee CH, Hashmi I, Iqbal H. Membrane biofouling retardation and improved sludge characteristics using quorum quenching bacteria in submerged membrane bioreactor. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.02.011] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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162
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Abstract
SUMMARY Autoinduction (AI), the response to self-produced chemical signals, is widespread in the bacterial world. This process controls vastly different target functions, such as luminescence, nutrient acquisition, and biofilm formation, in different ways and integrates additional environmental and physiological cues. This diversity raises questions about unifying principles that underlie all AI systems. Here, we suggest that such core principles exist. We argue that the general purpose of AI systems is the homeostatic control of costly cooperative behaviors, including, but not limited to, secreted public goods. First, costly behaviors require preassessment of their efficiency by cheaper AI signals, which we encapsulate in a hybrid "push-pull" model. The "push" factors cell density, diffusion, and spatial clustering determine when a behavior becomes effective. The relative importance of each factor depends on each species' individual ecological context and life history. In turn, "pull" factors, often stress cues that reduce the activation threshold, determine the cellular demand for the target behavior. Second, control is homeostatic because AI systems, either themselves or through accessory mechanisms, not only initiate but also maintain the efficiency of target behaviors. Third, AI-controlled behaviors, even seemingly noncooperative ones, are generally cooperative in nature, when interpreted in the appropriate ecological context. The escape of individual cells from biofilms, for example, may be viewed as an altruistic behavior that increases the fitness of the resident population by reducing starvation stress. The framework proposed here helps appropriately categorize AI-controlled behaviors and allows for a deeper understanding of their ecological and evolutionary functions.
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Affiliation(s)
- Burkhard A Hense
- Institute for Computational Biology, Helmholtz Zentrum München, Neuherberg/Munich, Germany
| | - Martin Schuster
- Department of Microbiology, Oregon State University, Corvallis, Oregon, USA
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163
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Thiopeptide antibiotics stimulate biofilm formation in Bacillus subtilis. Proc Natl Acad Sci U S A 2015; 112:3086-91. [PMID: 25713360 DOI: 10.1073/pnas.1414272112] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Bacteria have evolved the ability to produce a wide range of structurally complex natural products historically called "secondary" metabolites. Although some of these compounds have been identified as bacterial communication cues, more frequently natural products are scrutinized for antibiotic activities that are relevant to human health. However, there has been little regard for how these compounds might otherwise impact the physiology of neighboring microbes present in complex communities. Bacillus cereus secretes molecules that activate expression of biofilm genes in Bacillus subtilis. Here, we use imaging mass spectrometry to identify the thiocillins, a group of thiazolyl peptide antibiotics, as biofilm matrix-inducing compounds produced by B. cereus. We found that thiocillin increased the population of matrix-producing B. subtilis cells and that this activity could be abolished by multiple structural alterations. Importantly, a mutation that eliminated thiocillin's antibiotic activity did not affect its ability to induce biofilm gene expression in B. subtilis. We go on to show that biofilm induction appears to be a general phenomenon of multiple structurally diverse thiazolyl peptides and use this activity to confirm the presence of thiazolyl peptide gene clusters in other bacterial species. Our results indicate that the roles of secondary metabolites initially identified as antibiotics may have more complex effects--acting not only as killing agents, but also as specific modulators of microbial cellular phenotypes.
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164
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Haas CN. Microbial dose response modeling: past, present, and future. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:1245-59. [PMID: 25545032 DOI: 10.1021/es504422q] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The understanding of the risk to humans from exposure to pathogens has been firmly put into a risk assessment framework. A key element of applying this approach is the understanding of the relationship between dose and response for particular pathogens. This understanding has progressed from early use of threshold concepts ("minimal infectious dose") thru multiple generations of models. Generation 1 models describe probability of response to exposed dose. Generation 2 models incorporate host factors (e.g., age) and/or pathogen factors (e.g., particle size of inhaled agents). Generation 3 models describe the rate at which effects develop, i.e. the epidemic curve. These (generation 1 through three models) have been developed and used in multiple contexts. Beyond Generation 3 lies an opportunity for the deep incorporation of in vivo physiological responses and the coupling of the individual host dynamics to the dynamics of spread of contagious diseases in the population. This would enable more direct extrapolation from controlled dosing studies to estimate population level effects. There remain also needs to understand broader categories of infectious agents, including pathogenic amoebae and fungi. More advanced models need to be validated against well-characterized human outbreak data.
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Affiliation(s)
- Charles N Haas
- Department of Civil, Architectural & Environmental Engineering Drexel University Philadelphia, Pennsylvania 19104, United States
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165
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Wu D, Li A, Yang J, Ma F, Chen H, Pi S, Wei W. N-3-Oxo-octanoyl-homoserine lactone as a promotor to improve the microbial flocculant production by an exopolysaccharide bioflocculant-producing bacterium Agrobacterium tumefaciens F2. RSC Adv 2015. [DOI: 10.1039/c5ra15657b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study showed thatAgrobacterium tumefaciensF2 can produceN-3-oxo-octanoyl-homoserine lactone (3-oxo-C8HSL), one of theN-acyl-homoserine lactone (AHL) class of microbial quorum-sensing signaling molecules.
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Affiliation(s)
- Dan Wu
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Ang Li
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Jixian Yang
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Han Chen
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Shanshan Pi
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
| | - Wei Wei
- State Key Laboratory of Urban Water Resource and Environment
- School of Municipal and Environmental Engineering
- Harbin Institute of Technology
- Harbin 150090
- People's Republic of China
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166
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Weerasekara NA, Choo KH, Lee CH. Hybridization of physical cleaning and quorum quenching to minimize membrane biofouling and energy consumption in a membrane bioreactor. WATER RESEARCH 2014; 67:1-10. [PMID: 25259678 DOI: 10.1016/j.watres.2014.08.049] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 08/08/2014] [Accepted: 08/30/2014] [Indexed: 05/26/2023]
Abstract
Membrane fouling and energy consumption are interconnected and considered as a bottleneck in membrane bioreactor (MBR) applications. This study investigated synergistic combinations of quorum quenching (QQ) and physical cleaning under different cleaning conditions and aeration intensities with respect to fouling control and energy saving. The MBR operated with periodic air backpulsing had a lower fouling tendency compared with the reactor operated with relaxation. Frequent physical cleanings mitigated the membrane fouling, but irreversible fouling inevitably occurred over time. A significant improvement in fouling control was accomplished when QQ was coupled with physical cleanings, particularly in the filtration/relaxation mode. The submerged QQ vessel helped operate the MBRs stably even at the lowest end of aeration intensity (51 s(-1) in G value), without any significant loss of membrane permeability. The specific membrane filtration energy of the QQMBR remained low and independent of aeration intensities tested, whereas that of the normal MBR sharply increased with decreased aeration rates. The QQMBR with low aeration intensity (51 s(-1)) reduced approximately 27% of the specific aeration energy required for the MBR operated at high aeration intensity (103 s(-1)). QQ bacteria should hamper the formation of a biofilm on the membrane surface, but mixed liquor properties and treatment performances were not affected by the QQ activity.
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Affiliation(s)
- Nuwan A Weerasekara
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 702-701, Republic of Korea
| | - Kwang-Ho Choo
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 702-701, Republic of Korea.
| | - Chung-Hak Lee
- School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea
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167
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Song XN, Cheng YY, Li WW, Li BB, Sheng GP, Fang CY, Wang YK, Li XY, Yu HQ. Quorum quenching is responsible for the underestimated quorum sensing effects in biological wastewater treatment reactors. BIORESOURCE TECHNOLOGY 2014; 171:472-476. [PMID: 25182424 DOI: 10.1016/j.biortech.2014.08.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 08/02/2014] [Accepted: 08/05/2014] [Indexed: 06/03/2023]
Abstract
Quorum sensing (QS) and quorum quenching (QQ) are two antagonistic processes coexisting in various bacterial communities in bioreactors, e.g., activated sludge for biological wastewater treatment. Although QS signal molecules are detected in activated sludge reactors and known to affect sludge properties and reactor performance, there has been no direct evidence to prove the endogenous existence of QQ effects in activated sludge. In this study, for the first time, acyl homoserine lactones-degrading enzymatic activity, a typical QQ effect, was discovered in activated sludge and found to considerably affect the QS detection results. The coexistence of QS and QQ bacteria in activated sludge was further confirmed by bacterial screening and denaturing gradient gel electrophoresis analysis. The method developed in this study could also be used to evaluate QQ activities in bioreactors, and a possible way is provided to tune bioreactor performance through balancing the QS and QQ processes.
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Affiliation(s)
- Xiang-Ning Song
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Yuan-Yuan Cheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
| | - Wen-Wei Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Bing-Bing Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Guo-Ping Sheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Cai-Yun Fang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Yun-Kun Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Xiao-Yan Li
- Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Hong Kong
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
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168
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169
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170
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Vanysacker L, Boerjan B, Declerck P, Vankelecom IFJ. Biofouling ecology as a means to better understand membrane biofouling. Appl Microbiol Biotechnol 2014; 98:8047-72. [DOI: 10.1007/s00253-014-5921-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 06/24/2014] [Accepted: 06/25/2014] [Indexed: 10/24/2022]
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171
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Li Y, Lv J, Zhong C, Hao W, Wang Y, Zhu J. Performance and role of N-acyl-homoserine lactone (AHL)-based quorum sensing (QS) in aerobic granules. J Environ Sci (China) 2014; 26:1615-1621. [PMID: 25108717 DOI: 10.1016/j.jes.2014.05.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 10/29/2013] [Accepted: 11/07/2013] [Indexed: 06/03/2023]
Abstract
The present study investigated the relationship between N-acyl-homoserine lactone (AHL)-based quorum sensing (QS) and the physico-chemical properties of aerobic granules. Stable mature granules were observed in SBR2 and SBR3 with average diameters of 0.96, and 1.49 mm, respectively. The sludge densities of aerobic granules in SBR2 and SBR3 were 1.0246, and 1.0201 g/mL, respectively, which were higher than that of flocculent sludge in SBR1 (1.0065 g/mL). The results showed that the activity of AHL-based QS in SBR2 and SBR3 amounted to 2.4- and 2.1-fold induction, however, that in SBR1 with flocculent sludge was 1.6-fold induction. In addition, the results also showed that the activity of AHL-based QS in the three reactors rose in the feast condition, and then dropped with the consumption of substrate. However, the activity of AHL-based QS in these three reactors recovered again in prolonged starvation. Furthermore, the results showed that the enhancement of AHL-based QS favored the extracellular polymeric substance production of microorganisms in activated sludge. Thus, it could be concluded that aerobic granules showed higher AHL-based QS than flocculent sludge, which resulted from the higher sludge density of aerobic granules than flocculent sludge. AHL-based QS was related to the metabolism energy in the feast condition; however, in prolonged starvation, microorganisms would emit more AHL-like molecules to protect themselves to resist starvation. Moreover, the enhancement of AHL-based QS favored the EPS component productivity of the microorganisms in activated sludge, which contributed to maintain the aerobic granular structure.
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Affiliation(s)
- Yaochen Li
- School of Environment, Beijing Normal University, Beijing 100875, China; School of Water Resource and Environment, Shijiazhuang University of Economics, Shijiazhuang 050031, China
| | - Junping Lv
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Chen Zhong
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Wen Hao
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yaqin Wang
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Jianrong Zhu
- School of Environment, Beijing Normal University, Beijing 100875, China.
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172
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N-acyl homoserine lactone-mediated quorum sensing with special reference to use of quorum quenching bacteria in membrane biofouling control. BIOMED RESEARCH INTERNATIONAL 2014; 2014:162584. [PMID: 25147787 PMCID: PMC4131561 DOI: 10.1155/2014/162584] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 07/04/2014] [Accepted: 07/06/2014] [Indexed: 11/17/2022]
Abstract
Membrane biofouling remains a severe problem to be addressed in wastewater treatment systems affecting reactor performance and economy. The finding that many wastewater bacteria rely on N-acyl homoserine lactone-mediated quorum sensing to synchronize their activities essential for biofilm formations; the quenching bacterial quorum sensing suggests a promising approach for control of membrane biofouling. A variety of quorum quenching compounds of both synthetic and natural origin have been identified and found effective in inhibition of membrane biofouling with much less environmental impact than traditional antimicrobials. Work over the past few years has demonstrated that enzymatic quorum quenching mechanisms are widely conserved in several prokaryotic organisms and can be utilized as a potent tool for inhibition of membrane biofouling. Such naturally occurring bacterial quorum quenching mechanisms also play important roles in microbe-microbe interactions and have been used to develop sustainable nonantibiotic antifouling strategies. Advances in membrane fabrication and bacteria entrapment techniques have allowed the implication of such quorum quenching bacteria for better design of membrane bioreactor with improved antibiofouling efficacies. In view of this, the present paper is designed to review and discuss the recent developments in control of membrane biofouling with special emphasis on quorum quenching bacteria that are applied in membrane bioreactors.
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173
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Role of N-acyl homoserine lactone (AHL)-based quorum sensing (QS) in aerobic sludge granulation. Appl Microbiol Biotechnol 2014; 98:7623-32. [DOI: 10.1007/s00253-014-5815-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 04/30/2014] [Accepted: 05/03/2014] [Indexed: 10/25/2022]
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174
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Lade H, Paul D, Kweon JH. Quorum quenching mediated approaches for control of membrane biofouling. Int J Biol Sci 2014; 10:550-65. [PMID: 24910534 PMCID: PMC4046882 DOI: 10.7150/ijbs.9028] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 04/29/2014] [Indexed: 12/24/2022] Open
Abstract
Membrane biofouling is widely acknowledged as the most frequent adverse event in wastewater treatment systems resulting in significant loss of treatment efficiency and economy. Different strategies including physical cleaning and use of antimicrobial chemicals or antibiotics have been tried for reducing membrane biofouling. Such traditional practices are aimed to eradicate biofilms or kill the bacteria involved, but the greater efficacy in membrane performance would be achieved by inhibiting biofouling without interfering with bacterial growth. As a result, the search for environmental friendly non-antibiotic antifouling strategies has received much greater attention among scientific community. The use of quorum quenching natural compounds and enzymes will be a potential approach for control of membrane biofouling. This approach has previously proven useful in diseases and membrane biofouling control by triggering the expression of desired phenotypes. In view of this, the present review is provided to give the updated information on quorum quenching compounds and elucidate the significance of quorum sensing inhibition in control of membrane biofouling.
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Affiliation(s)
| | - Diby Paul
- Department of Environmental Engineering, Konkuk University, Seoul-143-701, Korea
| | - Ji Hyang Kweon
- Department of Environmental Engineering, Konkuk University, Seoul-143-701, Korea
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175
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Li Y, Hao W, Lv J, Wang Y, Zhong C, Zhu J. The role of N-acyl homoserine lactones in maintaining the stability of aerobic granules. BIORESOURCE TECHNOLOGY 2014; 159:305-310. [PMID: 24657763 DOI: 10.1016/j.biortech.2014.02.090] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2014] [Revised: 02/16/2014] [Accepted: 02/22/2014] [Indexed: 06/03/2023]
Abstract
In this study, porcine kidney acylase, as N-acyl homoserine lactones (AHLs)-degradation enzyme, was employed for the first time to directly investigate the role of AHLs in the structure stability of aerobic granules. Results clearly showed that inactivation of AHLs by AHLs-acylase could weaken the stability of aerobic granule. In the presence of AHLs-acylase, AHLs were degraded by hydrolyzing the amide linkage, which resulted in aerobic granular attachment potential and activity of AHLs-based quorum sensing significantly reduced. In addition, it was also found that inactivation of AHLs led to reduction of extracellular polysaccharides and protein (PN), especially PN, and induced extracellular polymeric substances matrix damaged, which was hostile to stability of aerobic granules. This study provided direct evidence that AHLs played a key role in improving aerobic granular stability, and a potential way to enhance long-term stability of aerobic granules.
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Affiliation(s)
- Yaochen Li
- School of Environment, Beijing Normal University, Beijing 100875, China; School of Water Resource and Environment, Shijiazhuang University of Economics, Hebei 050031, China
| | - Wen Hao
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Junping Lv
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yaqin Wang
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Chen Zhong
- School of Environment, Beijing Normal University, Beijing 100875, China
| | - Jianrong Zhu
- School of Environment, Beijing Normal University, Beijing 100875, China.
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176
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Feng H, Ding Y, Wang M, Zhou G, Zheng X, He H, Zhang X, Shen D, Shentu J. Where are signal molecules likely to be located in anaerobic granular sludge? WATER RESEARCH 2014; 50:1-9. [PMID: 24355329 DOI: 10.1016/j.watres.2013.11.021] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Revised: 09/30/2013] [Accepted: 11/18/2013] [Indexed: 06/03/2023]
Abstract
Quorum sensing is a concentration-sensing mechanism that plays a vital role in sludge granulation. In this study, the regularities of distribution of different signal molecules, including intra- and interspecific signal molecules (diffusible signal factor, DSF), interspecific signal molecules (autoinducter-2, AI-2) and intraspecific signal molecules (acyl-homoserine lactones, AHLs), from three types of anaerobic granular sludge were investigated. The results showed that 70-90% of DSF was distributed in sludge, while AI-2 in the Water phase accounted for over 80% of the total content. Interestingly, there was a positive correlation between DSF and AI-2, which played opposite roles in granulation. Moreover, more than 55% of short and medium acyl chain AHLs tended to spread in aqueous water, while the long acyl chain AHLs were closer to granular sludge than the short and medium acyl chain AHLs. With the exception of one type of sludge, the percentage of long acyl chain AHLs in the sludge phase was greater than 70%. The different distributions of signal molecules were primarily determined based on their physicochemical properties, including molecular weight and solubility in water or organic solutions. In addition, the basic properties of sludge, such as the granular level or the production of EPS, were closely related to the diversity, distribution and concentration of signal molecules. As a medium in granulation, extracellular polymeric substances production was regulated by different signal molecules from different parts of anaerobic granular sludge. This study provides a foundation for investigation of quorum sensing in the system of anaerobic granular sludge.
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Affiliation(s)
- Huajun Feng
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Yangcheng Ding
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Meizhen Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Guanglan Zhou
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Xin Zheng
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Hongzhen He
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Xueqin Zhang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Dongsheng Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Jiali Shentu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
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177
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Huang H, Ren H, Ding L, Geng J, Xu K, Zhang Y. Aging biofilm from a full-scale moving bed biofilm reactor: characterization and enzymatic treatment study. BIORESOURCE TECHNOLOGY 2014; 154:122-30. [PMID: 24384319 DOI: 10.1016/j.biortech.2013.12.031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 12/05/2013] [Accepted: 12/08/2013] [Indexed: 05/08/2023]
Abstract
Effective removal of aging biofilm deserves to receive more attention. This study aimed to characterized aging biofilm from a full-scale moving bed biofilm reactor treating pharmaceutical wastewater and evaluate the hydrolysis effects of biofilm by different enzymatic treatments. Results from FTIR and biochemical composition analyses showed that it was a predominately organic-based biofilm with the ratio of total protein (PN) to polysaccharide (PS) of 20.17. A reticular structure of extracellular polymeric matrix (EPM) with filamentous bacteria as the skeleton was observed on the basal layer through SEM-EDS test. Among the four commercial proteases and amylases from Genencor®, proteases were shown to have better performances than amylases either on the removal of MLSS and PN/MLSS or on DOC (i.e., dissolved organic carbon)/MLSS raising of biofilm pellets. Difference of dynamic fluorescence characteristics of dissolved organic matters after treated by the two proteases indicated distinguishing mechanisms of the treating process.
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Affiliation(s)
- Hui Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, PR China; Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huai'an 223300, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, PR China.
| | - Lili Ding
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, PR China
| | - Jinju Geng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, PR China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, PR China
| | - Yan Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, PR China
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178
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Modestra JA, Mohan SV. Bio-electrocatalyzed electron efflux in Gram positive and Gram negative bacteria: an insight into disparity in electron transfer kinetics. RSC Adv 2014. [DOI: 10.1039/c4ra03489a] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Electron transfer (ET) behavior of bacteria varies significantly in a bio-electrocatalyzed environment based on the cell membrane.
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Affiliation(s)
- J. Annie Modestra
- Bioengineering and Environmental Science (BEES)
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500 007, India
| | - S. Venkata Mohan
- Bioengineering and Environmental Science (BEES)
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500 007, India
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179
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Huang B, Feng H, Ding Y, Zheng X, Wang M, Li N, Shen D, Zhang H. Microbial metabolism and activity in terms of nitrate removal in bioelectrochemical systems. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.08.172] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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180
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Huang Y, Zeng Y, Yu Z, Zhang J, Feng H, Lin X. In silico and experimental methods revealed highly diverse bacteria with quorum sensing and aromatics biodegradation systems--a potential broad application on bioremediation. BIORESOURCE TECHNOLOGY 2013; 148:311-316. [PMID: 24055974 DOI: 10.1016/j.biortech.2013.08.155] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Revised: 08/24/2013] [Accepted: 08/27/2013] [Indexed: 06/02/2023]
Abstract
Phylogenetic overlaps between aromatics-degrading bacteria and acyl-homoserine-lactone (AHL) or autoinducer (AI) based quorum-sensing (QS) bacteria were evident in literatures; however, the diversity of bacteria with both activities had never been finely described. In-silico searching in NCBI genome database revealed that more than 11% of investigated population harbored both aromatic ring-hydroxylating-dioxygenase (RHD) gene and AHL/AI-synthetase gene. These bacteria were distributed in 10 orders, 15 families, 42 genus and 78 species. Horizontal transfers of both genes were common among them. Using enrichment and culture dependent method, 6 Sphingomonadales and 4 Rhizobiales with phenanthrene- or pyrene-degrading ability and AHL-production were isolated from marine, wetland and soil samples. Thin-layer-chromatography and gas-chromatography-mass-spectrum revealed that these Sphingomonads produced various AHL molecules. This is the first report of highly diverse bacteria that harbored both aromatics-degrading and QS systems. QS regulation may have broad impacts on aromatics biodegradation, and would be a new angle for developing bioremediation technology.
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Affiliation(s)
- Yili Huang
- Department of Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China.
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181
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Malaeb L, Le-Clech P, Vrouwenvelder JS, Ayoub GM, Saikaly PE. Do biological-based strategies hold promise to biofouling control in MBRs? WATER RESEARCH 2013; 47:5447-63. [PMID: 23863390 DOI: 10.1016/j.watres.2013.06.033] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Revised: 05/21/2013] [Accepted: 06/15/2013] [Indexed: 05/26/2023]
Abstract
Biofouling in membrane bioreactors (MBRs) remains a primary challenge for their wider application, despite the growing acceptance of MBRs worldwide. Research studies on membrane fouling are extensive in the literature, with more than 200 publications on MBR fouling in the last 3 years; yet, improvements in practice on biofouling control and management have been remarkably slow. Commonly applied cleaning methods are only partially effective and membrane replacement often becomes frequent. The reason for the slow advancement in successful control of biofouling is largely attributed to the complex interactions of involved biological compounds and the lack of representative-for-practice experimental approaches to evaluate potential effective control strategies. Biofouling is driven by microorganisms and their associated extra-cellular polymeric substances (EPS) and microbial products. Microorganisms and their products convene together to form matrices that are commonly treated as a black box in conventional control approaches. Biological-based antifouling strategies seem to be a promising constituent of an effective integrated control approach since they target the essence of biofouling problems. However, biological-based strategies are in their developmental phase and several questions should be addressed to set a roadmap for translating existing and new information into sustainable and effective control techniques. This paper investigates membrane biofouling in MBRs from the microbiological perspective to evaluate the potential of biological-based strategies in offering viable control alternatives. Limitations of available control methods highlight the importance of an integrated anti-fouling approach including biological strategies. Successful development of these strategies requires detailed characterization of microorganisms and EPS through the proper selection of analytical tools and assembly of results. Existing microbiological/EPS studies reveal a number of implications as well as knowledge gaps, warranting future targeted research. Systematic and representative microbiological studies, complementary utilization of molecular and biofilm characterization tools, standardized experimental methods and validation of successful biological-based antifouling strategies for MBR applications are needed. Specifically, in addition, linking these studies to relevant operational conditions in MBRs is an essential step to ultimately develop a better understanding and more effective and directed control strategy for biofouling.
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Affiliation(s)
- Lilian Malaeb
- Water Desalination and Reuse Research Center and Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
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182
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Raghavulu SV, Modestra JA, Amulya K, Reddy CN, Venkata Mohan S. Relative effect of bioaugmentation with electrochemically active and non-active bacteria on bioelectrogenesis in microbial fuel cell. BIORESOURCE TECHNOLOGY 2013; 146:696-703. [PMID: 23988904 DOI: 10.1016/j.biortech.2013.07.097] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/18/2013] [Accepted: 07/21/2013] [Indexed: 06/02/2023]
Abstract
Bioelectrogenic activity of microbial fuel cells (MFC) augmented with electrochemically active bacteria (EAB, Pseudomonas aeruginosa) and non-EAB (Escherichia coli) as biocatalysts was investigated. Anodic microflora augmented with P. aeruginosa (AMFCP) yielded higher electrogenic activity (418 mV; 3.87 mA) than E. coli (AMFCE; 254 mV; 1.67 mA) and non-augmented native microflora (MFCC; 235 mV; 1.37 mA). Higher redox currents along with lower Tafel-slopes were observed with AMFCP operation compared to AMFCE and MFCC due to manifestation of bioaugmentation thereby minimizing the losses. A fourfold and twofold increase in capacitance and exchange current was observed with AMFCP and AMFCE operation respectively, when compared to MFCC. Tracking of augmented biocatalyst by fluorescent in situ hybridization (FISH) with defined probes documented the survivability of Pseudomonas sp. in higher numbers than Enterobacteriaceae. Study corroborated enhanced electron transfer capability of mixed consortia owing to the synergistic interaction with EAB due to augmentation.
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Affiliation(s)
- S Veer Raghavulu
- Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
| | - J Annie Modestra
- Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
| | - K Amulya
- Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
| | - C Nagendranatha Reddy
- Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India
| | - S Venkata Mohan
- Bioengineering and Environmental Centre (BEEC), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500 007, India.
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183
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Wang JH, He HZ, Wang MZ, Wang S, Zhang J, Wei W, Xu HX, Lv ZM, Shen DS. Bioaugmentation of activated sludge with Acinetobacter sp. TW enhances nicotine degradation in a synthetic tobacco wastewater treatment system. BIORESOURCE TECHNOLOGY 2013; 142:445-53. [PMID: 23748093 DOI: 10.1016/j.biortech.2013.05.067] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/16/2013] [Accepted: 05/17/2013] [Indexed: 06/02/2023]
Abstract
Bioaugmentation (BA) using Acinetobacter sp. TW with high nicotine-degrading efficiency was applied in a bioreactor receiving a load of COD (3,200 ± 50 mg/L) and nicotine (1.0 ± 0.1g/L). The results showed that because of the colonization of strain TW, the COD removal was stable at 80-90%, while nicotine removal reached 98% in the BA system. Furthermore, according to PCR-DGGE fingerprinting, compared with the originally activated sludge, more bacteria existed in the BA systems while some bacteria disappeared from the non-BA system. In terms of the quorum sensing, short chain AHLs increased to assist colonization of strain TW, and long chain AHLs were secreted and helped to resist the nicotine toxicity. Compared with the non-BA system, the amounts of ROS, protein carbonyls and 8-OHdG were significant lower in the BA systems, which suggested that strain TW played an important role in eliminating the nicotine toxicity from the bioreactors.
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Affiliation(s)
- Jue-Hua Wang
- College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
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184
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Yong YC, Zhong JJ. Regulation of aromatics biodegradation by rhl quorum sensing system through induction of catechol meta-cleavage pathway. BIORESOURCE TECHNOLOGY 2013; 136:761-765. [PMID: 23582222 DOI: 10.1016/j.biortech.2013.03.134] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Revised: 03/17/2013] [Accepted: 03/18/2013] [Indexed: 06/02/2023]
Abstract
The mechanism for quorum sensing (QS) regulation on aromatics degradation was investigated. Deletion of rhl QS system resulted in a significant decrease in aromatics biodegradation as well as the activity of catechol 2,3-dioxygenase (C23O, key enzyme for catechol meta-cleavage pathway) in Pseudomonas aeruginosa CGMCC1.860. Interestingly, this repression could be relieved by N-butyryl homoserine lactone (the signaling molecule of rhl QS system) addition. In accordance, the transcription level of nahH (the gene encoding C23O) and nahR (transcriptional activator) also responded to rhl perturbation in a similar way. The results indicated that rhl QS system positively controlled the catechol meta-cleavage pathway, and hence improved aromatics biodegradation. It suggested manipulation of QS system could be a promising strategy to tune the catechol cleavage pathway and to control aromatics biodegradation.
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Affiliation(s)
- Yang-Chun Yong
- Biofuels Institute, School of the Environment, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu Province, China
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185
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Ren TT, Li XY, Yu HQ. Effect of N-acy-l-homoserine lactones-like molecules from aerobic granules on biofilm formation by Escherichia coli K12. BIORESOURCE TECHNOLOGY 2013; 129:655-658. [PMID: 23305896 DOI: 10.1016/j.biortech.2012.12.043] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Revised: 12/06/2012] [Accepted: 12/08/2012] [Indexed: 06/01/2023]
Abstract
A laboratory study was conducted to investigate the production of quorum sensing (QS) molecules by aerobic granules in membrane-partitioned bioreactor. Flow-chamber (FC) tests with Escherichia coli K12 demonstrated that granules induced more attached growth of E. coli cells than activated sludge flocs, leading to more cell adhesion and biofilm formation on the FC cover slide. Using the thin-layer chromatography, N-acy-l-homoserine lactones (AHLs) with acyl chains shorter than 10 carbons were detected in the liquid phase of granular sludge. Organic substances extracted with acidified ethyl acetate from the supernatant of granular sludge promoted the adhesion and growth of E. coli cells on the glass surface. AHL-like signal molecules were apparently produced by granules and might be involved in the formation of granules and the maintenance of granular structures during wastewater treatment.
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Affiliation(s)
- Ting-ting Ren
- Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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186
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Martin KJ, Nerenberg R. The membrane biofilm reactor (MBfR) for water and wastewater treatment: principles, applications, and recent developments. BIORESOURCE TECHNOLOGY 2012; 122:83-94. [PMID: 22541953 DOI: 10.1016/j.biortech.2012.02.110] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 02/25/2012] [Accepted: 02/27/2012] [Indexed: 05/31/2023]
Abstract
The membrane biofilm reactor (MBfR), an emerging technology for water and wastewater treatment, is based on pressurized membranes that supply a gaseous substrate to a biofilm formed on the membrane's exterior. MBfR biofilms behave differently from conventional biofilms due to the counter-diffusion of substrates. MBfRs are uniquely suited for numerous treatment applications, including the removal of carbon and nitrogen when oxygen is supplied, and reduction of oxidized contaminants when hydrogen is supplied. Major benefits include high gas utilization efficiency, low energy consumption, and small reactor footprints. The first commercial MBfR was recently released, and its success may lead to the scale-up of other applications. MBfR development still faces challenges, including biofilm management, the design of scalable reactor configurations, and the identification of cost-effective membranes. If future research and development continue to address these issues, the MBfR may play a key role in the next generation of sustainable treatment systems.
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Affiliation(s)
- Kelly J Martin
- Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA.
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187
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Mallegol J, Duncan C, Prashar A, So J, Low DE, Terebeznik M, Guyard C. Essential roles and regulation of the Legionella pneumophila collagen-like adhesin during biofilm formation. PLoS One 2012; 7:e46462. [PMID: 23029523 PMCID: PMC3460888 DOI: 10.1371/journal.pone.0046462] [Citation(s) in RCA: 20] [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: 01/31/2012] [Accepted: 08/31/2012] [Indexed: 11/19/2022] Open
Abstract
Legionellosis is mostly caused by Legionella pneumophila (Lp) and is defined by a severe respiratory illness with a case fatality rate ranging from 5 to 80%. In a previous study, we showed that a glycosaminoglycan (GAG)-binding adhesin of Lp, named Lcl, is produced during legionellosis and is unique to the L. pneumophila species. Importantly, a mutant depleted in Lcl (Δlpg2644) is impaired in adhesion to GAGs and epithelial cells and in biofilm formation. Here, we examine the molecular function(s) of Lcl and the transcriptional regulation of its encoding gene during different stages of the biofilm development. We show that the collagen repeats and the C-terminal domains of Lcl are crucial for the production of biofilm. We present evidence that Lcl is involved in the early step of surface attachment but also in intercellular interactions. Furthermore, we address the relationship between Lcl gene regulation during biofilm formation and quorum sensing (QS). In a static biofilm assay, we show that Lcl is differentially regulated during growth phases and biofilm formation. Moreover, we show that the transcriptional regulation of lpg2644, mediated by a prototype of QS signaling homoserine lactone (3OC12-HSL), may play a role during the biofilm development. Thus, transcriptional down-regulation of lpg2644 may facilitate the dispersion of Lp to reinitiate biofilm colonization on a distal surface.
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Affiliation(s)
- Julia Mallegol
- Ontario Agency for Health Protection and Promotion (OAHPP), Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Carla Duncan
- Ontario Agency for Health Protection and Promotion (OAHPP), Toronto, Ontario, Canada
| | - Akriti Prashar
- Cells and System Biology and Department of Biological Sciences, University of Toronto at Scarborough, Toronto, Ontario, Canada
| | - Jannice So
- Ontario Agency for Health Protection and Promotion (OAHPP), Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Donald E. Low
- Ontario Agency for Health Protection and Promotion (OAHPP), Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Mauricio Terebeznik
- Cells and System Biology and Department of Biological Sciences, University of Toronto at Scarborough, Toronto, Ontario, Canada
| | - Cyril Guyard
- Ontario Agency for Health Protection and Promotion (OAHPP), Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Mount Sinai Hospital, Toronto, Ontario, Canada
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188
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Xia S, Zhou L, Zhang Z, Li J. Influence and mechanism of N-(3-oxooxtanoyl)-L-homoserine lactone (C8-oxo-HSL) on biofilm behaviors at early stage. J Environ Sci (China) 2012; 24:2035-40. [PMID: 23534198 DOI: 10.1016/s1001-0742(11)61060-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
N-acyl-homoserines quenching, enzymatic quenching of bacterial quorum sensing, has recently applied to mitigate biofilm in membrane bioreactor. However, the effect of AHLs on the behavior of biofilm formation is still sparse. In this study, Pseudomonas aeruginosa biofilm was formed on ultra-filtration membrane under a series of N-(3-oxooxtanoyl)-L-homoserine lactone (Cs-oxo-HSL) concentrations. Diffusing C8-oxo-HSL increased the growth rate of cells on biofilm where the concentration of C8-oxo-HSL was over 10(-7) g/L. The C8-oxo-HSL gradient had no observable influence on cell density and extracellular polymeric substances of biofilm with over 10(-7) g/L C8-oxo-HSL. Surprisingly, 10(-11)-10(-8) g/L of C8-oxo-HSL had no effect on cell growth in liquid culture. The cell analysis demonstrated that the quorum sensing system might enhance the growth of neighboring cells in contact with surfaces into biofilm and may influence the structure and organization of biofilm.
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Affiliation(s)
- Siqing Xia
- State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
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