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Cabral EM, Mondala JRM, Oliveira M, Przyborska J, Fitzpatrick S, Rai DK, Sivagnanam SP, Garcia-Vaquero M, O'Shea D, Devereux M, Tiwari BK, Curtin J. Influence of molecular weight fractionation on the antimicrobial and anticancer properties of a fucoidan rich-extract from the macroalgae Fucus vesiculosus. Int J Biol Macromol 2021; 186:994-1002. [PMID: 34216667 DOI: 10.1016/j.ijbiomac.2021.06.182] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 06/17/2021] [Accepted: 06/26/2021] [Indexed: 11/22/2022]
Abstract
The objective of this study was to investigate the antimicrobial and anticancer properties of a fucoidan extract and subsequent fractions isolated from the macroalgae Fucus vesiculosus. The fractions obtained (>300 kDa, <300 kDa, <100 kDa, <50 kDa and <10 kDa) could inhibit the growth of B. subtilis, E. coli, L. innocua and P. fluorescens when assayed at concentrations between 12,500 and 25,000 ppm. The bacterial growth was monitored by optical density (OD) measurements (600 nm, 24 h) at 30 °C or 37 °C, depending upon on the strain used. The extracted fractions were also tested for cytotoxicity against brain glioblastoma cancer cells using the Alamar Blue assay for 24 h, 48 h and 6 days. The >300 kDa fraction presented the lowest IC50 values (0.052% - 24 h; 0.032% - 6 days). The potential bioactivity of fucoidan as an antimicrobial and anticancer agent was demonstrated in this study. Hence, the related mechanisms of action should be explored in a near future.
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Affiliation(s)
| | - Julie Rose Mae Mondala
- School of Food Science & Environmental Health, College of Sciences & Health, Technological University Dublin, City Campus, Dublin, Ireland.
| | - Márcia Oliveira
- Department of Food Hygiene and Technology, Institute of Food Science and Technology, University of León, León, Spain.
| | - Joanna Przyborska
- Shannon Applied Biotechnology Centre, Munster Technological University, Tralee, Co. Kerry, Ireland.
| | | | - Dilip K Rai
- Teagasc Food Research Centre Ashtown, Dublin 15, Ireland.
| | | | - Marco Garcia-Vaquero
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland.
| | - Denis O'Shea
- School of Food Science & Environmental Health, College of Sciences & Health, Technological University Dublin, City Campus, Dublin, Ireland.
| | - Michael Devereux
- School of Food Science & Environmental Health, College of Sciences & Health, Technological University Dublin, City Campus, Dublin, Ireland.
| | | | - James Curtin
- School of Food Science & Environmental Health, College of Sciences & Health, Technological University Dublin, City Campus, Dublin, Ireland.
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2
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Montone AMI, Papaianni M, Malvano F, Capuano F, Capparelli R, Albanese D. Lactoferrin, Quercetin, and Hydroxyapatite Act Synergistically against Pseudomonas fluorescens. Int J Mol Sci 2021; 22:ijms22179247. [PMID: 34502150 PMCID: PMC8431635 DOI: 10.3390/ijms22179247] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 08/23/2021] [Accepted: 08/24/2021] [Indexed: 01/01/2023] Open
Abstract
Pseudomonas fluorescens is an opportunistic, psychotropic pathogen that can live in different environments, such as plant, soil, or water surfaces, and it is associated with food spoilage. Bioactive compounds can be used as antimicrobials and can be added into packaging systems. Quercetin and lactoferrin are the best candidates for the development of a complex of the two molecules absorbed on bio combability structure as hydroxyapatite. The minimum inhibiting concentration (MIC) of single components and of the complex dropped down the single MIC value against Pseudomonas fluorescens. Characterization analysis of the complex was performed by means SEM and zeta-potential analysis. Then, the synergistic activity (Csyn) of single components and the complex was calculated. Finally, the synergistic activity was confirmed, testing in vitro its anti-inflammatory activity on U937 macrophage-like human cell line. In conclusion, the peculiarity of our study consists of optimizing the specific propriety of each component: the affinity of lactoferrin for LPS; that of quercetin for the bacterial membrane. These proprieties make the complex a good candidate in food industry as antimicrobial compounds, and as functional food.
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Affiliation(s)
- Angela Michela Immacolata Montone
- Department of Industrial Engineering, University of Salerno, 84084 Salerno, Italy; (A.M.I.M.); (F.M.); (D.A.)
- Department of Food Inspection, Istituto Zooprofilattico Sperimentale del Mezzogiorno, 80055 Naples, Italy;
| | - Marina Papaianni
- Department of Agriculture, University of Naples “Federico II”, 80055 Naples, Italy;
| | - Francesca Malvano
- Department of Industrial Engineering, University of Salerno, 84084 Salerno, Italy; (A.M.I.M.); (F.M.); (D.A.)
| | - Federico Capuano
- Department of Food Inspection, Istituto Zooprofilattico Sperimentale del Mezzogiorno, 80055 Naples, Italy;
| | - Rosanna Capparelli
- Department of Agriculture, University of Naples “Federico II”, 80055 Naples, Italy;
- Correspondence:
| | - Donatella Albanese
- Department of Industrial Engineering, University of Salerno, 84084 Salerno, Italy; (A.M.I.M.); (F.M.); (D.A.)
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Essawy E, Abdelfattah MS, El-Matbouli M, Saleh M. Synergistic Effect of Biosynthesized Silver Nanoparticles and Natural Phenolic Compounds against Drug-Resistant Fish Pathogens and Their Cytotoxicity: An In Vitro Study. Mar Drugs 2021; 19:md19010022. [PMID: 33429926 PMCID: PMC7827678 DOI: 10.3390/md19010022] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/31/2020] [Accepted: 01/06/2021] [Indexed: 01/16/2023] Open
Abstract
Fish pathogens causing disease outbreaks represent a major threat to aquaculture industry and food security. The aim of the presented study is to develop safe and effective bioactive agents against two bacterial isolates: Aeromonas hydrophila and Pseudomonas fluorescens. We employed a broth microdilution method to investigate the antibacterial effect of biosynthesized silver nanoparticles (AgNPs); rutin, a natural flavonoid extracted from Ruta graveneoles; and heliomycin, a secondary metabolite produced by marine actinomycetes AB5, as monotherapeutic agents. Moreover, AgNPs in combination with rutin (AgNP + R) and heliomycin (AgNPs + H) were examined for their synergistic effect. The cytotoxic effect of individual bioactive compounds and in combination with AgNPs was investigated on epithelioma papulosum cyprini (EPC) fish cell lines. Individual treatment of AgNPs, rutin, and heliomycin exhibited a dose-dependent antimicrobial activity against A. hydrophila and P. fluorescens. Rutin minimum inhibitory concentration (MIC) showed the lowest cytotoxicity when tested on EPC cell lines, while heliomycin MIC was highly cytotoxic. Combined subtherapeutic doses of AgNPs + R and AgNPs + H displayed additive and synergistic effects against A. hydrophila and P. fluorescens, respectively, with improved results and relative safety profile. The study findings demonstrate that a combination of AgNPs and natural bioactive compounds may represent novel therapeutics fighting fish pathogens potentially affecting the fish farming industry.
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Affiliation(s)
- Ehab Essawy
- Clinical Division of Fish Medicine, University of Veterinary Medicine, 1210 Vienna, Austria; (M.E.-M.); (M.S.)
- Department of Chemistry, Faculty of Science, Helwan University, Cairo 11795, Egypt;
- Helwan Nanotechnology Center, Helwan University, Cairo 11795, Egypt
- Correspondence: ; Tel.: +43-1-250774736; Fax: +43-1-250775192
| | - Mohamed S. Abdelfattah
- Department of Chemistry, Faculty of Science, Helwan University, Cairo 11795, Egypt;
- Marine Natural Products Unit, Faculty of Science, Helwan University, Cairo 11795, Egypt
| | - Mansour El-Matbouli
- Clinical Division of Fish Medicine, University of Veterinary Medicine, 1210 Vienna, Austria; (M.E.-M.); (M.S.)
| | - Mona Saleh
- Clinical Division of Fish Medicine, University of Veterinary Medicine, 1210 Vienna, Austria; (M.E.-M.); (M.S.)
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4
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Barros CHN, Fulaz S, Vitale S, Casey E, Quinn L. Interactions between functionalised silica nanoparticles and Pseudomonas fluorescens biofilm matrix: A focus on the protein corona. PLoS One 2020; 15:e0236441. [PMID: 32701973 PMCID: PMC7377396 DOI: 10.1371/journal.pone.0236441] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 07/06/2020] [Indexed: 11/18/2022] Open
Abstract
Biofilms are microbial communities embedded in an extracellular polymeric matrix and display an enhanced tolerance to the action of antimicrobials. The emergence of novel functionalised nanoparticles is considered a promising avenue for the development of biofilm-specific antimicrobial technologies. However, there is a gap in the understanding of interactions between nanoparticles and the biofilm matrix. Particularly, questions are raised on how nanoparticle charge and surface groups play a role in aggregation when in contact with biofilm components. Herein we present the synthesis of four types of silica nanoparticles and undertake an analysis of their interactions with Pseudomonas fluorescens biofilm matrix. The effect of the biofilm matrix components on the charge and aggregation of the nanoparticles was assessed. Additionally, the study focused on the role of matrix proteins, with the in-depth characterisation of the protein corona of each nanoparticle by Liquid Chromatography with Tandem Mass Spectrometry experiments. The protein corona composition is dependent on the nanoparticle type; non-functionalised nanoparticles show less protein selectivity, whereas carboxylate-functionalised nanoparticles prefer proteins with a higher isoelectric point. These outcomes provide insights into the field of biofilm-nanoparticle interactions that can be valuable for the design of new nano-based targeting systems in future anti-biofilm applications.
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Affiliation(s)
- Caio H. N. Barros
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
| | - Stephanie Fulaz
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
| | - Stefania Vitale
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
| | - Eoin Casey
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
| | - Laura Quinn
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
- * E-mail:
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Pajor K, Pajchel Ł, Zgadzaj A, Piotrowska U, Kolmas J. Modifications of Hydroxyapatite by Gallium and Silver Ions-Physicochemical Characterization, Cytotoxicity and Antibacterial Evaluation. Int J Mol Sci 2020; 21:ijms21145006. [PMID: 32679901 PMCID: PMC7404191 DOI: 10.3390/ijms21145006] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/14/2020] [Accepted: 07/14/2020] [Indexed: 12/11/2022] Open
Abstract
Hydroxyapatite (HA) powders enriched with silver or gallium ions or both were synthesized by two different routes: standard precipitation and the solid-state method. The powders were characterized by using several methods: inductively coupled plasma optical emission spectrometry (ICP-OES), powder X-ray diffractometry (PXRD), transmission electron microscopy (TEM), infrared spectroscopy (FT-IR) and solid-state nuclear magnetic resonance spectroscopy (ssNMR). The effects of enrichment of the HAs in Ag+ or Ga3+ or both on in vitro cytotoxicity and microbiological activity were discussed. PXRD experiments showed that the samples obtained by the wet method consisted of single-phase nanocrystalline HA, while the samples prepared via the solid-state method are microcrystalline with a small amount of calcium oxide. The introduction of higher amounts of silver ions was found to be more effective than enriching HA with small amounts of Ag+. Gallium and silver ions were found not to affect the lattice parameters. Ga3+ affected the crystallinity of the samples as well as the content of structural hydroxyl groups. Among samples synthesized by the wet method, only one (5Ag-HAw) was cytotoxic, whereas all Ga-containing samples obtained by the dry method showed cytotoxicity. In the preliminary antimicrobial test all the materials containing "foreign" ions showed high antibacterial activity.
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Affiliation(s)
- Kamil Pajor
- Department of Analytical Chemistry, Chair of Analytical Chemistry and Biomaterials, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland; (K.P.); (Ł.P.)
| | - Łukasz Pajchel
- Department of Analytical Chemistry, Chair of Analytical Chemistry and Biomaterials, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland; (K.P.); (Ł.P.)
| | - Anna Zgadzaj
- Department of Environmental Health Sciences, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland;
| | - Urszula Piotrowska
- Faculty of Medical Sciences and Health Sciences, Kazimierz Pulaski University of Technology and Humanities in Radom, Chrobrego 27 St., 26-600 Radom, Poland;
| | - Joanna Kolmas
- Department of Analytical Chemistry, Chair of Analytical Chemistry and Biomaterials, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland; (K.P.); (Ł.P.)
- Correspondence:
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Jarzębski M, Siejak P, Smułek W, Fathordoobady F, Guo Y, Pawlicz J, Trzeciak T, Kowalczewski PŁ, Kitts DD, Singh A, Pratap Singh A. Plant Extracts Containing Saponins Affects the Stability and Biological Activity of Hempseed Oil Emulsion System. Molecules 2020; 25:E2696. [PMID: 32532010 PMCID: PMC7321345 DOI: 10.3390/molecules25112696] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/04/2020] [Accepted: 06/08/2020] [Indexed: 01/26/2023] Open
Abstract
In this study, two saponins-rich plant extracts, viz. Saponaria officinalis and Quillaja saponaria, were used as surfactants in an oil-in-water (O/W) emulsion based on hempseed oil (HSO). This study focused on a low oil phase content of 2% v/v HSO to investigate stable emulsion systems under minimum oil phase conditions. Emulsion stability was characterized by the emulsification index (EI), centrifugation tests, droplet size distribution as well as microscopic imaging. The smallest droplets recorded by dynamic light scattering (droplets size v. number), one day after the preparation of the emulsion, were around 50-120 nm depending the on use of Saponaria and Quillaja as a surfactant and corresponding to critical micelle concentration (CMC) in the range 0-2 g/L. The surface and interfacial tension of the emulsion components were studied as well. The effect of emulsions on environmental bacteria strains was also investigated. It was observed that emulsions with Saponaria officinalis extract exhibited slight toxic activity (the cell metabolic activity reduced to 80%), in contrast to Quillaja emulsion, which induced Pseudomonas fluorescens ATCC 17400 growth. The highest-stability samples were those with doubled CMC concentration. The presented results demonstrate a possible use of oil emulsions based on plant extract rich in saponins for the food industry, biomedical and cosmetics applications, and nanoemulsion preparations.
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Affiliation(s)
- Maciej Jarzębski
- Department of Physics and Biophysics, Faculty of Food Science and Nutrition, Poznań University of Life Sciences, Wojska Polskiego 38/42, 60-637 Poznań, Poland; (M.J.); (P.S.)
| | - Przemysław Siejak
- Department of Physics and Biophysics, Faculty of Food Science and Nutrition, Poznań University of Life Sciences, Wojska Polskiego 38/42, 60-637 Poznań, Poland; (M.J.); (P.S.)
| | - Wojciech Smułek
- Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, 60-695 Poznan, Poland
| | - Farahnaz Fathordoobady
- Food Nutrition and Health Program, Faculty of Land and Food Systems, The University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada; (F.F.); (Y.G.); (D.D.K.); (A.S.)
| | - Yigong Guo
- Food Nutrition and Health Program, Faculty of Land and Food Systems, The University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada; (F.F.); (Y.G.); (D.D.K.); (A.S.)
| | - Jarosław Pawlicz
- Department of Orthopedics and Traumatology, Poznan University of Medical Sciences, 28 Czerwca 1956 135/147, 61-545 Poznań, Poland; (J.P.); (T.T.)
| | - Tomasz Trzeciak
- Department of Orthopedics and Traumatology, Poznan University of Medical Sciences, 28 Czerwca 1956 135/147, 61-545 Poznań, Poland; (J.P.); (T.T.)
| | - Przemysław Łukasz Kowalczewski
- Institute of Food Technology of Plant Origin, Poznań University of Life Sciences, Wojska Polskiego 31, 60-624 Poznań, Poland;
| | - David D. Kitts
- Food Nutrition and Health Program, Faculty of Land and Food Systems, The University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada; (F.F.); (Y.G.); (D.D.K.); (A.S.)
| | - Anika Singh
- Food Nutrition and Health Program, Faculty of Land and Food Systems, The University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada; (F.F.); (Y.G.); (D.D.K.); (A.S.)
| | - Anubhav Pratap Singh
- Food Nutrition and Health Program, Faculty of Land and Food Systems, The University of British Columbia, 2205 East Mall, Vancouver, BC V6T 1Z4, Canada; (F.F.); (Y.G.); (D.D.K.); (A.S.)
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Matsubara ME, Helwig K, Hunter C, Roberts J, Subtil EL, Coelho LHG. Amoxicillin removal by pre-denitrification membrane bioreactor (A/O-MBR): Performance evaluation, degradation by-products, and antibiotic resistant bacteria. Ecotoxicol Environ Saf 2020; 192:110258. [PMID: 32036097 DOI: 10.1016/j.ecoenv.2020.110258] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 11/26/2019] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
Membrane bioreactors (MBRs) are one of the treatment technologies with the potential to remove emerging compounds from wastewater. The present work evaluated the efficiency of an MBR pilot system in removing amoxicillin from synthetic wastewater using a continuous flow pre-denitrification MBR (A/O-MBR) pilot unit. The system operated in three phases: (1) synthetic wastewater and hydraulic retention time (HRT) of 40 h; (2) adding amoxicillin 100 μg L-1 to the influent, and (3) varying flowrate to HRT of 20 h. Liquid chromatography coupled to high resolution mass spectrometry analysis confirmed the presence of five amoxicillin degradation by-products in the effluent. The addition of amoxicillin did not affect chemical oxygen demand (COD) or dissolved organic carbon (DOC) removal efficiencies. Respirometry showed that amoxicillin level did not inhibit heterotrophic bacteria metabolism. The change in HRT reduced the DOC removal (from 84% to 66%) but did not influence COD (>94%) or total nitrogen (>72%). The amoxicillin and by-products removal decreased from 80% to 54% with HRT change. Adsorption and biodegradation represented the largest removed fraction of the antibiotic in the A/O-MBR system (68%). Ecotoxicity assays showed P. fluorescens was more resistant and E. coli less resistant to amoxicillin residues at effluent sample matrix.
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Affiliation(s)
- Milena Emy Matsubara
- Environmental Science & Technology Post-Graduation Course, Centre of Engineering, Modelling and Applied Social Sciences, Federal University of ABC, Avenida dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | - Karin Helwig
- Environmental Management, School of Engineering and Built Environment, Glasgow Caledonian University, Cowcaddens Road, Glasgow, G4 0BA, United Kingdom
| | - Colin Hunter
- Environmental Management, School of Engineering and Built Environment, Glasgow Caledonian University, Cowcaddens Road, Glasgow, G4 0BA, United Kingdom
| | - Joanne Roberts
- Environmental Management, School of Engineering and Built Environment, Glasgow Caledonian University, Cowcaddens Road, Glasgow, G4 0BA, United Kingdom
| | - Eduardo Lucas Subtil
- Environmental Science & Technology Post-Graduation Course, Centre of Engineering, Modelling and Applied Social Sciences, Federal University of ABC, Avenida dos Estados, 5001, Santo André, SP, 09210-580, Brazil
| | - Lúcia Helena Gomes Coelho
- Environmental Science & Technology Post-Graduation Course, Centre of Engineering, Modelling and Applied Social Sciences, Federal University of ABC, Avenida dos Estados, 5001, Santo André, SP, 09210-580, Brazil.
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Patange A, Lu P, Boehm D, Cullen PJ, Bourke P. Efficacy of cold plasma functionalised water for improving microbiological safety of fresh produce and wash water recycling. Food Microbiol 2019; 84:103226. [PMID: 31421764 DOI: 10.1016/j.fm.2019.05.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 04/15/2019] [Accepted: 05/21/2019] [Indexed: 10/26/2022]
Abstract
Atmospheric cold plasma (ACP) is an effective method for microbiological decontamination. This study evaluated an alternative water-based decontamination approach for inactivation of bacterial population from fresh produce and in the wash water generated from fresh produce washing. The study characterised ACP inactivation of attached Listeria innocua and Pseudomonas fluorescens inoculated on lettuce in comparison to chlorine treatment. P. fluorescens was sensitive to ACP treatment and was reduced below detection limit within 3 min of treatment. L. innocua population was reduced by ∼2.4 Log10 CFU/g after 5 min of treatment; showing similar inactivation efficacy to chlorine treatment. The microbial load in wash water was continuously decreased and was below detection limits after 10 min of ACP treatment. Micro-bubbling along with agitation assisted the bacterial detachment and distribution of reactive species, thus increasing bacterial inactivation efficacy from fresh produce and wash water. A shift in pH of plasma functionalised water was observed along with high concentration of nitrate and ozone with a relative amount of nitrites which increased with plasma exposure time. Further, L. innocua treated at different independent pH conditions showed minimal or no effect of pH on ACP bacterial inactivation efficacy. Aqueous ACP treatment poses a promising alternative for decontamination of fresh produce and the associated wash-waters which could be applied in the food industry to replace continuous chlorine dosing of process waters.
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Affiliation(s)
- Apurva Patange
- School of Food Science and Environmental Health, Technological University Dublin, Ireland
| | - Peng Lu
- School of Food Science and Environmental Health, Technological University Dublin, Ireland
| | - Daniela Boehm
- School of Food Science and Environmental Health, Technological University Dublin, Ireland
| | - P J Cullen
- School of Food Science and Environmental Health, Technological University Dublin, Ireland; School of Chemical Engineering, University of Sydney, Australia
| | - Paula Bourke
- School of Food Science and Environmental Health, Technological University Dublin, Ireland; School of Biological Sciences, Queens University Belfast, Northern Ireland, United Kingdom.
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Petitte J, Doherty M, Ladd J, Marin CL, Siles S, Michelou V, Damon A, Quattrini Eckert E, Huang X, Rice JW. Use of high-content analysis and machine learning to characterize complex microbial samples via morphological analysis. PLoS One 2019; 14:e0222528. [PMID: 31545814 PMCID: PMC6756541 DOI: 10.1371/journal.pone.0222528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 09/01/2019] [Indexed: 11/23/2022] Open
Abstract
High Content Analysis (HCA) has become a cornerstone of cellular analysis within the drug discovery industry. To expand the capabilities of HCA, we have applied the same analysis methods, validated in numerous mammalian cell models, to microbiology methodology. Image acquisition and analysis of various microbial samples, ranging from pure cultures to culture mixtures containing up to three different bacterial species, were quantified and identified using various machine learning processes. These HCA techniques allow for faster cell enumeration than standard agar-plating methods, identification of “viable but not plate culturable” microbe phenotype, classification of antibiotic treatment effects, and identification of individual microbial strains in mixed cultures. These methods greatly expand the utility of HCA methods and automate tedious and low-throughput standard microbiological methods.
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Affiliation(s)
- Jennifer Petitte
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - Michael Doherty
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - Jacob Ladd
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - Cassandra L. Marin
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - Samuel Siles
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - Vanessa Michelou
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - Amanda Damon
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | | | - Xiang Huang
- Novozymes North America, Inc., Durham, North Carolina, United States of America
| | - John W. Rice
- Novozymes North America, Inc., Durham, North Carolina, United States of America
- * E-mail:
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Shu H, Chen H, Wang X, Hu Y, Yun Y, Zhong Q, Chen W, Chen W. Antimicrobial Activity and Proposed Action Mechanism of 3-Carene against Brochothrix thermosphacta and Pseudomonas fluorescens. Molecules 2019; 24:molecules24183246. [PMID: 31489899 PMCID: PMC6767529 DOI: 10.3390/molecules24183246] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Revised: 09/03/2019] [Accepted: 09/04/2019] [Indexed: 01/05/2023] Open
Abstract
3-Carene is an antimicrobial monoterpene that occurs naturally in a variety of plants and has an ambiguous antibacterial mechanism against food-borne germs. The antibacterial effects and action mechanism of 3-carene against Gram-positive Brochothrix thermosphacta ACCC 03870 and Gram-negative Pseudomonas fluorescens ATCC 13525 were studied. Scanning electron microscopy (SEM) examination and leakage of alkaline phosphatase (AKP) verified that 3-carene caused more obvious damage to the morphology and wall structure of B. thermosphacta than P. fluorescens. The release of potassium ions and proteins, the reduction in membrane potential (MP), and fluorescein diacetate (FDA) staining further confirmed that the loss of the barrier function of the cell membrane and the leakage of cytoplasmic contents were due to the 3-carene treatment. Furthermore, the disorder of succinate dehydrogenase (SDH), malate dehydrogenase (MDH), pyruvate kinase (PK), and ATP content indicated that 3-carene could lead to metabolic dysfunction and inhibit energy synthesis. In addition, the results from the fluorescence analysis revealed that 3-carene could probably bind to bacterial DNA and affect the conformation and structure of genomic DNA. These results revealed that 3-carene had strong antibacterial activity against B. thermosphacta and P. fluorescens via membrane damage, bacterial metabolic perturbations, and genomic DNA structure disruption, interfering in cellular functions and even causing cell death.
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Affiliation(s)
- Huizhen Shu
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
| | - Haiming Chen
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
- Chunguang Agro-Product Processing Institute, Wenchang 571333, China.
| | - Xiaolong Wang
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
| | - Yueying Hu
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
| | - Yonghuan Yun
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
| | - Qiuping Zhong
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
- Chunguang Agro-Product Processing Institute, Wenchang 571333, China.
| | - Weijun Chen
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
- Chunguang Agro-Product Processing Institute, Wenchang 571333, China.
| | - Wenxue Chen
- College of Food Sciences & Engineering, Hainan University, 58 People Road, Haikou 570228, China.
- Chunguang Agro-Product Processing Institute, Wenchang 571333, China.
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11
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Abstract
Accurate identification of infectious pathogens is essential for appropriate management of ocular infections. Routine laboratory protocols typically support bacterial growth at 37°C. We report a case, wherein we serendipitously isolated Pseudomonas fluorescens - an organism that prefers lower temperatures for optimal growth (psychrophilic) in the environment - from eviscerated contents of an eye with total corneal melt. This case highlights the need for being vigilant for organisms with different temperature sensitivities in culture media than that found in routine protocols.
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Affiliation(s)
- Sanchita Mitra
- Department of Ocular Microbiology, Oculoplasty, Cornea, Retina and Uveitis Services, L V Prasad Eye Institute, Bhubaneswar, Odisha, India
| | - Suryasnata Rath
- Department of Ocular Microbiology, Oculoplasty, Cornea, Retina and Uveitis Services, L V Prasad Eye Institute, Bhubaneswar, Odisha, India
| | - Sujata Das
- Department of Ocular Microbiology, Oculoplasty, Cornea, Retina and Uveitis Services, L V Prasad Eye Institute, Bhubaneswar, Odisha, India
| | - Soumyava Basu
- Department of Ocular Microbiology, Oculoplasty, Cornea, Retina and Uveitis Services, L V Prasad Eye Institute, Bhubaneswar, Odisha, India
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12
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Ehsani A, Naghibi SS, Aminzare M, Keykhosravi K, Hashemi M. Extraction of specific egg yolk antibodies and application in chitosan coating: effect on microbial and sensory properties of rainbow trout fillet during chilled storage. J Sci Food Agric 2019; 99:2356-2364. [PMID: 30367501 DOI: 10.1002/jsfa.9442] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 08/30/2018] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND This study investigated the effect of chitosan coating enriched with extracted egg yolk antibodies on microbial and sensory quality of rainbow trout fillet during refrigeration (4 ± 1 °C). Firstly, bacterial antigen suspensions (total psychrophilic bacteria, Pseudomonas fluorescens and Shewanella putrefaciens) were injected into the breast muscles of chickens. Eggs of immunized chickens were then collected to isolate immunoglobulin from egg yolks (IgY). Fresh fish fillets were coated by chitosan solution containing different types of IgY separately, at two concentrations (60 and 90 mg mL-1 ), refrigerated for 16 days and analysed for total viable count, psychrotrophic, Pseudomonas spp., P. fluorescens and S. putrefaciens count as well as sensorial properties. RESULTS The tested microbial values increased in all samples during the storage period; however, CH + IgY treated samples could significantly retard microbial growth compared to control. The shelf life of CH + IgY-P samples was extended for about 4 days, while it was extended for about 8 days in CH + IgY-S and CH + IgY-T samples, when they were compared to control (p < 0.05). Higher scores for sensory attributes were also observed in CH + IgY treated samples, especially in CH + IgY-S samples until the end of storage period. CONCLUSIONS Accordingly, use of chitosan coating containing IgY increases the microbial and sensory quality of fish flesh at 4 °C. Therefore, given the consumer interest in natural additives, chitosan coating containing IgY can be a promising candidate. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Ali Ehsani
- Department of Food Science and Technology, Faculty of Nutrition, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Seyedeh S Naghibi
- Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Majid Aminzare
- Department of Food Safety and Hygiene, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Kobra Keykhosravi
- Department of Food Hygiene and Aquaculture, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Hashemi
- Department of Nutrition, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
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13
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Patange A, Boehm D, Ziuzina D, Cullen PJ, Gilmore B, Bourke P. High voltage atmospheric cold air plasma control of bacterial biofilms on fresh produce. Int J Food Microbiol 2019; 293:137-145. [PMID: 30711711 DOI: 10.1016/j.ijfoodmicro.2019.01.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 01/02/2019] [Accepted: 01/09/2019] [Indexed: 12/24/2022]
Abstract
Atmospheric cold plasma (ACP) offers great potential for decontamination of food borne pathogens. This study examined the antimicrobial efficacy of ACP against a range of pathogens of concern to fresh produce comparing planktonic cultures, monoculture biofilms (Escherichia coli, Salmonella enterica, Listeria monocytogenes, Pseudomonas fluorescens) and mixed culture biofilms (Listeria monocytogenes and Pseudomonas fluorescens). Biotic and abiotic surfaces commonly occurring in the fresh food industry were investigated. Microorganisms showed varying susceptibility to ACP treatment depending on target and process factors. Bacterial biofilm populations treated with high voltage (80 kV) ACP were reduced significantly (p < 0.05) in both mono- and mixed species biofilms after 60 s of treatment and yielded non-detectable levels after extending treatment time to 120 s. However, an extended time was required to reduce the challenge mixed culture biofilm of L. monocytogenes and P. fluorescens inoculated on lettuce, which was dependent on biofilm formation conditions and substrate. Contained treatment for 120 s reduced L. monocytogenes and P. fluorescens inoculated as mixed cultures on lettuce (p < 0.05) by 2.2 and 4.2 Log10 CFU/ml respectively. When biofilms were grown at 4 °C on lettuce, there was an increased resistance to ACP treatment by comparison with biofilm grown at temperature abuse conditions of 15 °C. Similarly, L. monocytogenes and P. fluorescens exposed to cold stress (4 °C) for 1 h demonstrated increased tolerance to ACP treatment compared to non-stressed cells. These finding demonstrates that bacterial form, mono versus mixed challenges as well as environmental stress conditions play an important role in ACP inactivation efficacy.
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Affiliation(s)
- Apurva Patange
- Plasma Research Group, School of Food Science and Environmental Health, Technological University Dublin, Dublin 1, Ireland
| | - D Boehm
- Plasma Research Group, School of Food Science and Environmental Health, Technological University Dublin, Dublin 1, Ireland
| | - Dana Ziuzina
- Plasma Research Group, School of Food Science and Environmental Health, Technological University Dublin, Dublin 1, Ireland
| | - P J Cullen
- Plasma Research Group, School of Food Science and Environmental Health, Technological University Dublin, Dublin 1, Ireland
| | - Brendan Gilmore
- Biofilm Research Group, School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast BT97BL, UK
| | - Paula Bourke
- Plasma Research Group, School of Food Science and Environmental Health, Technological University Dublin, Dublin 1, Ireland.
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14
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Lipus D, Vikram A, Gulliver D, Bibby K. Upregulation of peroxide scavenging enzymes and multidrug efflux proteins highlight an active sodium hypochlorite response in Pseudomonas fluorescens biofilms. Biofouling 2019; 35:329-339. [PMID: 31066290 DOI: 10.1080/08927014.2019.1605357] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 03/28/2019] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
The oxidative biocide sodium hypochlorite is among the most commonly used antimicrobial agents in the control of surface-attached microbial communities (biofilms). Clarifying the genetic response of microorganisms in biofilms to hypochlorite may contribute to improved biofilm control strategies. Here, RNA-seq was used to investigate the differential gene expression response of industrially relevant Pseudomonas fluorescens biofilms to sub-lethal concentrations of sodium hypochlorite. Pseudomonas biofilms responded to hypochlorite exposure with increased transcription of genes encoding peroxide scavenging enzymes (e.g., alkyl hydroperoxide reductase (Ahp) and hydroperoxide resistance protein (Ohr)), oxidative stress repair enzymes (e.g., the periplasmic sulfoxide reductase YedYZ complex), and multidrug efflux (e.g., MexEF pumps). In addition, genes involved in amino acid synthesis and energy metabolism were down-regulated following hypochlorite exposure. This work improves the current understanding of genetic response mechanisms to biocides and contributes to the optimization of biocides and application strategies.
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Affiliation(s)
- Daniel Lipus
- a National Energy Technology Laboratory (NETL) , Pittsburgh , Pennsylvania , USA
- b Oak Ridge Institute for Science and Education , Oak Ridge , Tennessee , USA
- c Department of Civil and Environmental Engineering , University of Pittsburgh , Pittsburgh , Pennsylvania , USA
| | - Amit Vikram
- d US Department of Agriculture , Agricultural Research Service, Roman L. Hruska US Meat Animal Research Center, Clay Center , Nebraska
| | - Djuna Gulliver
- a National Energy Technology Laboratory (NETL) , Pittsburgh , Pennsylvania , USA
| | - Kyle Bibby
- b Oak Ridge Institute for Science and Education , Oak Ridge , Tennessee , USA
- c Department of Civil and Environmental Engineering , University of Pittsburgh , Pittsburgh , Pennsylvania , USA
- e Department of Civil & Environmental Engineering & Earth Sciences , University of Notre Dame , South Bend , Indiana , USA
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15
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Roila R, Valiani A, Ranucci D, Ortenzi R, Servili M, Veneziani G, Branciari R. Antimicrobial efficacy of a polyphenolic extract from olive oil by-product against "Fior di latte" cheese spoilage bacteria. Int J Food Microbiol 2019; 295:49-53. [PMID: 30802684 DOI: 10.1016/j.ijfoodmicro.2019.02.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 02/11/2019] [Accepted: 02/18/2019] [Indexed: 01/08/2023]
Abstract
This study aimed to evaluate a polyphenol extract from olive oil by-product, to improve the preservation of "Fior di latte" cheese during storage. Nine batches of "Fior di latte" cheese were manufactured in a local dairy production plant: three batches treated with 250 μg/mL of phenols from olive oil by-products in the governing liquid; three batches treated with 500 μg/mL of phenols in the governing liquid, and three untreated batches as the control group. The phenols effectively retarded the growth of Pseudomonas fluorescens and Enterobacteriaceae, acting mainly on the lag phase of the microorganisms, resulting in the prolongation of the time needed to reach the acceptable microbial limit. The delay in the growth of the spoilage bacteria was considered to indirectly influence the sensorial acceptability threshold, recorded through survival analysis. The combination of the two above-mentioned factors promotes the extension of "Fior di latte" cheese shelf life. by >2 and 4 days, for PA and PB respectively.
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Affiliation(s)
- Rossana Roila
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Via San Costanzo 4, 06126 Perugia (PG), Italy
| | - Andrea Valiani
- Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche, "Togo Rosati", Via Salvemini 1, 06126 Perugia (PG), Italy
| | - David Ranucci
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Via San Costanzo 4, 06126 Perugia (PG), Italy.
| | - Roberta Ortenzi
- Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche, "Togo Rosati", Via Salvemini 1, 06126 Perugia (PG), Italy
| | - Maurizio Servili
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Borgo XX Giugno 74, 06121 Perugia (PG), Italy
| | - Gianluca Veneziani
- Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Borgo XX Giugno 74, 06121 Perugia (PG), Italy
| | - Raffaella Branciari
- Dipartimento di Medicina Veterinaria, Università degli Studi di Perugia, Via San Costanzo 4, 06126 Perugia (PG), Italy
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16
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Kottara A, Hall JPJ, Harrison E, Brockhurst MA. Variable plasmid fitness effects and mobile genetic element dynamics across Pseudomonas species. FEMS Microbiol Ecol 2019; 94:4689093. [PMID: 29228229 PMCID: PMC5812508 DOI: 10.1093/femsec/fix172] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 11/30/2017] [Indexed: 11/28/2022] Open
Abstract
Mobile genetic elements (MGE) such as plasmids and transposons mobilise genes within and between species, playing a crucial role in bacterial evolution via horizontal gene transfer (HGT). Currently, we lack data on variation in MGE dynamics across bacterial host species. We tracked the dynamics of a large conjugative plasmid, pQBR103, and its Tn5042 mercury resistance transposon, in five diverse Pseudomonas species in environments with and without mercury selection. Plasmid fitness effects and stability varied extensively between host species and environments, as did the propensity for chromosomal capture of the Tn5042 mercury resistance transposon associated with loss of the plasmid. Whereas Pseudomonas fluorescens and Pseudomonas savastanoi stably maintained the plasmid in both environments, the plasmid was highly unstable in Pseudomonas aeruginosa and Pseudomonas putida, where plasmid-free genotypes with Tn5042 captured to the chromosome invaded to higher frequency under mercury selection. These data confirm that plasmid stability is dependent upon the specific genetic interaction of the plasmid and host chromosome rather than being a property of plasmids alone, and moreover imply that MGE dynamics in diverse natural communities are likely to be complex and driven by a subset of species capable of stably maintaining plasmids that would then act as hubs of HGT.
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Affiliation(s)
- Anastasia Kottara
- Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK
| | - James P J Hall
- Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK
| | - Ellie Harrison
- Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK
| | - Michael A Brockhurst
- Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK
- Corresponding author: Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield S10 2TN, UK. Tel: +44 (0)1142220051; E-mail:
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17
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Chaudhary K, Saraswat PK, Khan S. Improvement in fluoride remediation technology using GIS based mapping of fluoride contaminated groundwater and microbe assisted phytoremediation. Ecotoxicol Environ Saf 2019; 168:164-176. [PMID: 30388533 DOI: 10.1016/j.ecoenv.2018.10.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2018] [Revised: 09/30/2018] [Accepted: 10/02/2018] [Indexed: 06/08/2023]
Abstract
Fluoride (F) in groundwater is a major issue of water pollution. Geo-statistical analysis of groundwater quality in Newai Tehsil, (India) has been done in order to identify the possible spatial distribution of water quality parameters and to assess the spatial dependence of water properties with the help of principal component analysis (PCA) structure. Two types of maps (spatial map and principal component map) of groundwater quality have been developed. A field experiment was conducted to investigate the effect of different Fluoride (F) concentration combined with Pseudomonas fluorescens (P.F) on Prosopis juliflora plant. The field design was used as completely randomized block design with three replicates. Study revealed that parameters were found to be positively and highly correlated with principal component. Low and high values (with their acceptable limit) have also been displayed over the each spatial map. Plants treated with P. fluorescens showed the highest F uptake in root, shoot and leaves tissues were 33.14, 19.41 and 15.15 mg kg-1 after 120 days, respectively. Both total bioaccumulation factor (BF) and translocation factor (TF) were obtained above one i.e., 1.06 and 1.04, this confirmed the high accumulation and translocation of F in plant tissues. The F uptake efficiency of plant was enhanced to 67.7% and plant biomass was increased upto 57.03%. According to the available literature, this is the first spatial field study for the remediation of F polluted soil through P. fluorescens. The present study will be beneficial for researchers working towards further improvement of F phytoremediation technology. Also, GIS based study can be very useful for decision maker's exploration of groundwater to understand the potential of present research work on fluoride contamination.
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Affiliation(s)
- Khushboo Chaudhary
- Department of Bioscience and Biotechnology, Banasthali University, Tonk, Rajasthan 304022, India.
| | | | - Suphiya Khan
- Department of Bioscience and Biotechnology, Banasthali University, Tonk, Rajasthan 304022, India.
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18
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Wang Z, Wang C, You Y, Xu W, Lv Z, Liu Z, Chen W, Shi Y, Wang J. Response of Pseudomonas fluorescens to dimethyl phthalate. Ecotoxicol Environ Saf 2019; 167:36-43. [PMID: 30292974 DOI: 10.1016/j.ecoenv.2018.09.078] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 09/14/2018] [Accepted: 09/18/2018] [Indexed: 06/08/2023]
Abstract
Dimethyl phthalate (DMP) is a ubiquitous pollutant that is very harmful to organisms due to its mutagenicity, teratogenicity and carcinogenicity. Pseudomonas fluorescens (P. fluorescens) is one of the most important bacteria in the environment. In this study, the response of P. fluorescens to DMP was investigated. It was found that DMP greatly inhibited the growth and glucose utilization of P. fluorescens when the concentration of DMP was ranged from 20 to 40 mg/l. The surface hydrophobicity and membrane permeability of P. fluorescens were also increased by DMP. DMP could lead to the deformations of cell membrane and the mis-opening of membrane channels. RNA-Seq and RT-qPCR results showed that the expression of some genes in P. fluorescens were altered, including the genes involved in energy metabolism, ATP-binding cassette (ABC) transporting and two-component systems. Additionally, the productions of lactic acid and pyruvic acid were reduced and the activity of hexokinase was inhibited in P. fluorescens by DMP. Clearly, the results suggested that DMP contamination could alter the biological function of P. fluorescens in the environment.
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Affiliation(s)
- Zhigang Wang
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Chunlong Wang
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Yimin You
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Weihui Xu
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Zhihang Lv
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Zeping Liu
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Wenjing Chen
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Yiran Shi
- School of Life Science and Agriculture and Forestry, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.
| | - Junhe Wang
- Qiqihar Branch of Heilongjiang Academy of Agricultural Sciences, Qiqihar, Heilongjiang, 161006, China.
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19
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Hardi EH, Nugroho RA, Kusuma IW, Suwinarti W, Sudaryono A, Rostika R. Borneo herbal plant extracts as a natural medication for prophylaxis and treatment of Aeromonas hydrophila and Pseudomonas fluorescens infection in tilapia ( Oreochromis niloticus). F1000Res 2018; 7:1847. [PMID: 30984371 PMCID: PMC6439779 DOI: 10.12688/f1000research.16902.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/19/2018] [Indexed: 08/15/2023] Open
Abstract
Background: This study aims to describe the antibacterial and immunostimulant abilities of Boesenbergia pandurata (BP), Solanum ferox (SF) and Zingiber Zerumbet (ZZ) plant extracts to treat and prevent Aeromonas hydrophila and Pseudomonas fluorescens infection on Tilapia ( Oreochromis niloticus). Methods: Tilapia (initial weight 15±2 g) were injected intramuscularly (0.1 ml/fish) with a combination of A. hydrophila and P. fluorescens at a density of 1×10 5 CFU ml -1 of each bacteria. Treatment trials were performed at day 7 post-injection with each combined extract, while the prevention trial was performed by including the combined extract into the diet for six and seven days prior to injection. Various combinations of extract-60 ml SF extract/kg feed with 40 ml ZZ/kg feed (SF60/ZZ40), SF50/ZZ50, BP90/SF10, and BP50/SF50-were mixed with a commercial diet and used in both treatment and prevention trials. Haematological and immunological parameters were performed every week for four weeks. Results: In prevention trials, tilapia fed SF50/ZZ50 showed a significant increase of white and red blood cells from weeks 2 to 4. Similarly, significantly increased haematocrit was also found in tilapia fed SF50/ZZ50 in the treatment trial but not in the prevention trial. However, haemoglobin of tilapia in both trials was not affected by any of the various combinations of extract in the diet. Furthermore, phagocytic, respiratory burst, lysozyme activity indexes and survival rate of fish fed with combined extracts were found to be significantly higher than controls. Moreover, the amount of pathogenic bacteria in fish that were fed combined extracts was also lower than the control and was significantly different at week 4. Conclusions: This study indicates that the addition of combined extract into feed has a positive effect on the tilapia's immune system. The SF50/ZZ50 combination appears to improve the innate immune system of tilapia to treat and prevent bacterial infections.
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Affiliation(s)
- Esti Handayani Hardi
- Microbiology Laboratory, Department of Aquaculture, Faculty of Fisheries and Marine Science, Mulawarman University, Samarinda, East Kalimantan, 75123, Indonesia
| | - Rudy Agung Nugroho
- Animal Physiology, Development and Molecular Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, Mulawarman University, Samarinda, East Kalimantan, 75123, Indonesia
| | - Irawan Wijaya Kusuma
- Laboratory of Forest Product Chemistry, Faculty of Forestry, Mulawarman University, Samarinda, East Kalimantan, 75123, Indonesia
| | - Wiwin Suwinarti
- Laboratory of Forest Product Chemistry, Faculty of Forestry, Mulawarman University, Samarinda, East Kalimantan, 75123, Indonesia
| | - Agung Sudaryono
- Department of Aquaculture, Faculty of Fisheries and Marine Science, Diponegoro University, Semarang, Central Java, 50275, Indonesia
| | - Rita Rostika
- Department of Fisheries, Faculty of Fisheries and Marine Science, Padjajaran University, Bandung, West Java, 40600, Indonesia
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20
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Zeng H, Yuan L, Huang J. Negative effects of artemisinin on phosphorus solubilizing bacteria in vitro. Ecotoxicol Environ Saf 2018; 158:108-113. [PMID: 29665557 DOI: 10.1016/j.ecoenv.2018.04.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 04/03/2018] [Accepted: 04/06/2018] [Indexed: 06/08/2023]
Abstract
The anti-malarial drug artemisinin is extracted from the leaves of Artemisia annua L. Due to toxicity to some microorganisms, the release of artemisinin from this medicinal plant in commercial cultivation might produce a potential risk for phosphorus (P) solubilizing bacteria (PSB). Therefore, the growth, P mobilization, and proton and organic acid efflux by two PSB isolates, Bacillus subtilis and Pseudomonas fluorescens, obtained from the soil without growing A. annua L. in history in the region for growing A. annua L., Chongqing, China, were studied through soil and solution incubations with different nominal concentrations of artemisinin (0, 2.5, 5.0, and 10.0 mg/kg or mg/L). Addition of artemisinin into soil and culture solutions decreased significantly the number of PSB except P. fluorescens at a low artemisinin concentration (2.5 mg/L) in culture solution which remained unchanged in comparison with the control (without artemisinin). This suggests high artemisinin inhibited the cell division or led to the death of PSB, and the different species responded differently to artemisinin. Compared with original soil, PSB inoculation significantly increased Olsen P, whilst the addition of artemisinin decreased this P form in soil. There was a positive correlation between the number of PSB and Olsen P content in soils (r2 = 0.824, n = 8), indicating the involvement of PSB in P mobilization of insoluble minerals. Oxalate and acetate were commonly found in the bacterial culture solutions, which accounted for 73.6-84.4% of all organic acids in the culture medium without artemisinin. Malate was detected in the culture solution of B. subtilis, and citrate and succinate in P. fluorescens. The percentage of tricalcium phosphate solubilization (PTPS) positively correlated to the concentrations of protons and all organic acids (r2proton=0.901, n=8, P<0.01; r2organic acids=0.923, n=8, P<0.01). The concentrations of protons, organic acids and soluble inorganic P in culture solutions, and PTPS were decreased simultaneously as nominal artemisinin concentrations increased. For these decreases it implies the metabolic inhibition and the death of PSB caused by artemisinin could be the main reasons for the less efflux of protons and organic acids, presumably resulting in the decreased ability of PSB to mobilize inorganic P. Therefore, artemisinin released from A. annua L. in commercial and continual cultivation could adversely affect the community structure and inorganic P mobilization of PSB in soils.
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Affiliation(s)
- Huiwen Zeng
- College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Ling Yuan
- College of Resources and Environment, Southwest University, Chongqing 400716, China
| | - Jianguo Huang
- College of Resources and Environment, Southwest University, Chongqing 400716, China.
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21
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Yuan Z, Ruan J, Li Y, Qiu R. A new model for simulating microbial cyanide production and optimizing the medium parameters for recovering precious metals from waste printed circuit boards. J Hazard Mater 2018; 353:135-141. [PMID: 29660699 DOI: 10.1016/j.jhazmat.2018.04.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 04/03/2018] [Accepted: 04/04/2018] [Indexed: 06/08/2023]
Abstract
Bioleaching is a green recycling technology for recovering precious metals from waste printed circuit boards (WPCBs). However, this technology requires increasing cyanide production to obtain desirable recovery efficiency. Luria-Bertani medium (LB medium, containing tryptone 10 g/L, yeast extract 5 g/L, NaCl 10 g/L) was commonly used in bioleaching of precious metal. In this study, results showed that LB medium did not produce highest yield of cyanide. Under optimal culture conditions (25 °C, pH 7.5), the maximum cyanide yield of the optimized medium (containing tryptone 6 g/L and yeast extract 5 g/L) was 1.5 times as high as that of LB medium. In addition, kinetics and relationship of cell growth and cyanide production was studied. Data of cell growth fitted logistics model well. Allometric model was demonstrated effective in describing relationship between cell growth and cyanide production. By inserting logistics equation into allometric equation, we got a novel hybrid equation containing five parameters. Kinetic data for cyanide production were well fitted to the new model. Model parameters reflected both cell growth and cyanide production process.
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Affiliation(s)
- Zhihui Yuan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China
| | - Jujun Ruan
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China.
| | - Yaying Li
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China
| | - Rongliang Qiu
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, 135 Xingang Xi Road, Guangzhou, 510275, People's Republic of China.
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Hüwe C, Schmeichel J, Brodkorb F, Dohlen S, Kalbfleisch K, Kreyenschmidt M, Lorenz R, Kreyenschmidt J. Potential of antimicrobial treatment of linear low-density polyethylene with poly((tert-butyl-amino)-methyl-styrene) to reduce biofilm formation in the food industry. Biofouling 2018; 34:378-387. [PMID: 29663827 DOI: 10.1080/08927014.2018.1453926] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
Antimicrobial surfaces are one approach to prevent biofilms in the food industry. The aim of this study was to investigate the effect of poly((tert-butyl-amino)-methyl-styrene) (poly(TBAMS)) incorporated into linear low-density polyethylene (LLDPE) on the formation of mono- and mixed-species biofilms. The biofilm on untreated and treated LLDPE was determined after 48 and 168 h. The comparison of the results indicated that the ability of Listeria monocytogenes to form biofilms was completely suppressed by poly(TBAMS) (Δ168 h 3.2 log10 cfu cm-2) and colonization of Staphylococcus aureus and Escherichia coli was significantly delayed, but no effect on Pseudomonas fluorescens was observed. The results of dual-species biofilms showed complex interactions between the microorganisms, but comparable effects on the individual bacteria by poly(TBAMS) were identified. Antimicrobial treatment with poly(TBAMS) shows great potential to prevent biofilms on polymeric surfaces. However, a further development of the material is necessary to reduce the colonization of strong biofilm formers.
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Affiliation(s)
- Carina Hüwe
- a Faculty of Agriculture, Institute of Nutritional and Food Sciences, Food Processing Engineering , University of Bonn , Bonn , Germany
| | - Jennifer Schmeichel
- a Faculty of Agriculture, Institute of Nutritional and Food Sciences, Food Processing Engineering , University of Bonn , Bonn , Germany
| | - Florian Brodkorb
- b Department of Chemical Engineering , University of Applied Sciences Münster , Steinfurt , Germany
| | - Sophia Dohlen
- a Faculty of Agriculture, Institute of Nutritional and Food Sciences, Food Processing Engineering , University of Bonn , Bonn , Germany
| | - Katrin Kalbfleisch
- b Department of Chemical Engineering , University of Applied Sciences Münster , Steinfurt , Germany
| | - Martin Kreyenschmidt
- b Department of Chemical Engineering , University of Applied Sciences Münster , Steinfurt , Germany
| | - Reinhard Lorenz
- b Department of Chemical Engineering , University of Applied Sciences Münster , Steinfurt , Germany
| | - Judith Kreyenschmidt
- a Faculty of Agriculture, Institute of Nutritional and Food Sciences, Food Processing Engineering , University of Bonn , Bonn , Germany
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Li T, Wang D, Liu N, Ma Y, Ding T, Mei Y, Li J. Inhibition of quorum sensing-controlled virulence factors and biofilm formation in Pseudomonas fluorescens by cinnamaldehyde. Int J Food Microbiol 2018; 269:98-106. [PMID: 29421365 DOI: 10.1016/j.ijfoodmicro.2018.01.023] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 01/26/2018] [Accepted: 01/30/2018] [Indexed: 10/18/2022]
Abstract
Pseudomonas fluorescens, an important food spoiling bacteria, uses quorum sensing to control biofilm formation and motility. To date, only a few compounds targeting the LuxR-based quorum sensing system of P. fluorescens have been identified. In the present study, the quorum sensing inhibitory effect of cinnamaldehyde at sublethal concentrations was investigated in terms of inhibition of the extracellular protease, biofilm formation, and swimming and swarming motility. The total volatile basic nitrogen value was also measured to evaluate the effect of cinnamaldehyde on quality preservation of turbot fillets stored at 4 ± 1 °C for 15 days. The results showed that cinnamaldehyde significantly inhibited quorum sensing-dependent factors in P. fluorescens and extended the storage life of turbot. Unexpectedly, cinnamaldehyde did not interfere with production of AHLs (N-acylhomoserine lactones) by P. fluorescens, as shown by measurement of AHL production using GC-MS. Molecular docking analysis revealed that cinnamaldehyde can interact with the LuxR-type protein of P. fluorescens, which could constitute the molecular basis of the quorum sensing inhibition observed. These findings strongly suggest that cinnamaldehyde is a quorum sensing inhibitor with great potential for the preservation of aquatic products to guarantee food safety.
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Affiliation(s)
- Tingting Li
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian, Liaoning 116029, China.
| | - Dangfeng Wang
- College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China
| | - Nan Liu
- College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China
| | - Yan Ma
- College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China
| | - Ting Ding
- College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Yongchao Mei
- College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China
| | - Jianrong Li
- College of Food Science and Technology, Bohai University, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning 121013, China.
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Romeh AA, Hendawi MY. Biochemical interactions between Glycine max L. silicon dioxide (SiO 2) and plant growth-promoting bacteria (PGPR) for improving phytoremediation of soil contaminated with fenamiphos and its degradation products. Pestic Biochem Physiol 2017; 142:32-43. [PMID: 29107245 DOI: 10.1016/j.pestbp.2017.01.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 12/24/2016] [Accepted: 01/02/2017] [Indexed: 06/07/2023]
Abstract
Fenamiphos is a systematic nematicide-insecticide used extensively for the control of soil nematodes. Fenamiphos and oxidation products have been known to induce water pollution, soil pollution and ecotoxicological effects on aquatic organisms, as well as heath issues. This contaminant can be removed by phytoremediation. Herein, we tested several strategies to improve the effectiveness of this technology. A combination of G. max plus Pseudomonas fluorescens was more efficient than G. max plus Serratia marcescens or G. max alone in degrading fenamiphos to other metabolites. Three major metabolites, namely fenamiphos sulfoxide (FSO), fenamiphos sulfone (FSO2) and fenamiphos phenol (F-phenol), were detected in roots and leaves in which G. max amended with P. fluorescens or amended with S. marcescens produced a significant accumulation of FSO and FSO2 with higher amounts than for G. max alone. Leaf concentrations of FSO were always higher than in the roots, while FSO2 accumulated significantly more in G. max roots than in G. max leaves. In soil treated with fenamiphos, G. max roots and leaves alone, and in combined effects of plant and microorganisms, resulted in the disappearance of fenamiphos and the appearance of F-SO, F-SO2 and F-phenol, which in turn caused toxic stress in G. max and the resulting production of reactive oxygen species such as H2O2 with higher content and an increase in antioxidant GPX activity. Although a batch equilibrium technique showed that use of SiO2 resulted in the efficient removal of fenamiphos when compared with other treatments for removing adsorbed fenamiphos from soil, a fewer amount of fenamiphos was removed by G. max L. with SiO2. H2O2 content and GPX activity increased in G. max under fenamiphos treatment and its degradation products, while amended G. max with SiO2 or Argal led to a decrease in GPX activity and H2O2 content.
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Affiliation(s)
- Ahmed Ali Romeh
- Plant Production Department, Faculty of Technology and Development, Zagazig University, Zagazig, Egypt
| | - Mohamed Yousef Hendawi
- Plant Protection Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.
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Choudhari S, Habimana O, Hannon J, Allen A, Cummins E, Casey E. Dynamics of silver elution from functionalised antimicrobial nanofiltration membranes. Biofouling 2017; 33:520-529. [PMID: 28604168 DOI: 10.1080/08927014.2017.1331436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 05/12/2017] [Indexed: 06/07/2023]
Abstract
In an effort to mitigate biofouling on thin film composite membranes such as nanofiltration and reverse osmosis, a myriad of different surface modification strategies has been published. The use of silver nanoparticles (Ag-NPs) has emerged as being particularly promising. Nevertheless, the stability of these surface modifications is still poorly understood, particularly under permeate flux conditions. Leaching or elution of Ag-NPs from the membrane surface can not only affect the antimicrobial characteristics of the membrane, but could also potentially present an environmental liability when applied in industrial-scale systems. This study sought to investigate the dynamics of silver elution and the bactericidal effect of an Ag-NP functionalised NF270 membrane. Inductively coupled plasma-atomic emission spectroscopy was used to show that the bulk of leached silver occurred at the start of experimental runs, and was found to be independent of salt or permeate conditions used. Cumulative amounts of leached silver did, however, stabilise following the initial release, and were shown to have maintained the biocidal characteristics of the modified membrane, as observed by a higher fraction of structurally damaged Pseudomonas fluorescens cells. These results highlight the need to comprehensively assess the time-dependent nature of bactericidal membranes.
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Affiliation(s)
- S Choudhari
- a School of Chemical and Bioprocess Engineering , University College Dublin (UCD) , Dublin , Ireland
- b Department of Biological Sciences , Dayananda Sagar University , Bangalore , India
| | - O Habimana
- c School of Biological Sciences , The University of Hong Kong , Hong Kong , PR China
| | - J Hannon
- d School of Biosystems and Food Engineering, Agricultural and Food Science Centre , University College Dublin (UCD) , Dublin , Ireland
| | - A Allen
- a School of Chemical and Bioprocess Engineering , University College Dublin (UCD) , Dublin , Ireland
| | - E Cummins
- d School of Biosystems and Food Engineering, Agricultural and Food Science Centre , University College Dublin (UCD) , Dublin , Ireland
| | - E Casey
- a School of Chemical and Bioprocess Engineering , University College Dublin (UCD) , Dublin , Ireland
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26
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Liu X, Shen B, Du P, Wang N, Wang J, Li J, Sun A. Transcriptomic analysis of the response of Pseudomonas fluorescens to epigallocatechin gallate by RNA-seq. PLoS One 2017; 12:e0177938. [PMID: 28545064 PMCID: PMC5435343 DOI: 10.1371/journal.pone.0177938] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 05/05/2017] [Indexed: 12/19/2022] Open
Abstract
Epigallocatechin gallate (EGCG) is a main constituent of green tea polyphenols that are widely used as food preservatives and are considered to be safe for consumption. However, the underlying antimicrobial mechanism of EGCG and the bacterial response to EGCG are not clearly understood. In the present study, a genome-wide transcriptional analysis of a typical spoilage bacterium, Pseudomonas fluorescens that responded to EGCG was performed using RNA-seq technology. A total of 26,365,414 and 23,287,092 clean reads were generated from P. fluorescens treated with or without 1 mM EGCG and the clean reads were aligned to the reference genome. Differential expression analysis revealed 291 upregulated genes and 134 downregulated genes and the differentially expressed genes (DEGs) were verified using RT-qPCR. Most of the DGEs involved in iron uptake, antioxidation, DNA repair, efflux system, cell envelope and cell-surface component synthesis were significantly upregulated by EGCG treatment, while most genes associated with energy production were downregulated. These transcriptomic changes are likely to be adaptive responses of P. fluorescens to iron limitation and oxidative stress, as well as DNA and envelope damage caused by EGCG. The expression of specific genes encoding the extra-cytoplasmic function sigma factor (PvdS, RpoE and AlgU) and the two-component sensor histidine kinase (BaeS and RpfG) were markedly changed by EGCG treatment, which may play important roles in regulating the stress responses of P. fluorescens to EGCG. The present data provides important insights into the molecular action of EGCG and the possible cross-resistance mediated by EGCG on P. fluorescens, which may ultimately contribute to the optimal application of green tea polyphenols in food preservation.
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Affiliation(s)
- Xiaoxiang Liu
- Faculty of Basic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang, P.R. China
| | - Bimiao Shen
- Department of Laboratory Medicine, Hangzhou Medical College, Hangzhou, Zhejiang, P.R. China
| | - Peng Du
- Faculty of Basic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang, P.R. China
| | - Nan Wang
- College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou, P.R. China
| | - Jiaxue Wang
- Department of Laboratory Medicine, Hangzhou Medical College, Hangzhou, Zhejiang, P.R. China
| | - Jianrong Li
- Food Safety Key Lab of Liaoning Province, Bohai University, Jinzhou, Liaoning, China
| | - Aihua Sun
- Faculty of Basic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang, P.R. China
- * E-mail:
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27
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Ossowicki A, Jafra S, Garbeva P. The antimicrobial volatile power of the rhizospheric isolate Pseudomonas donghuensis P482. PLoS One 2017; 12:e0174362. [PMID: 28358818 PMCID: PMC5373542 DOI: 10.1371/journal.pone.0174362] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 03/07/2017] [Indexed: 11/19/2022] Open
Abstract
Soil and rhizosphere bacteria produce an array of secondary metabolites including a wide range of volatile organic compounds (VOCs). These compounds play an important role in the long-distance interactions and communication between (micro)organisms. Furthermore, bacterial VOCs are involved in plant pathogens inhibition and induction of soil fungistasis and suppressivenes. In the present study, we analysed the volatile blend emitted by the rhizospheric isolate Pseudomonas donghuensis P482 and evaluated the volatile effect on the plant pathogenic fungi and bacteria as well as one oomycete. Moreover, we investigated the role of the GacS/GacA system on VOCs production in P. donghuensis P482. The results obtained demonstrated that VOCs emitted by P. donghuensis P482 have strong antifungal and antioomycete, but not antibacterial activity. The production of certain volatiles such as dimethyl sulfide, S-methyl thioacetate, methyl thiocyanate, dimethyl trisulfide, 1-undecan and HCN is depended on the GacS/GacA two-component regulatory system. Apparently, these compounds play an important role in the pathogens suppression as the gacA mutant entirely lost the ability to inhibit via volatiles the growth of tested plant pathogens.
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Affiliation(s)
- Adam Ossowicki
- Laboratory of Biological Plant Protection, Department of Biotechnology, Intercollegiate Faculty of Biotechnology of University of Gdansk and Medical University of Gdansk, Gdansk, Poland
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Sylwia Jafra
- Laboratory of Biological Plant Protection, Department of Biotechnology, Intercollegiate Faculty of Biotechnology of University of Gdansk and Medical University of Gdansk, Gdansk, Poland
- * E-mail: (PG); (SJ)
| | - Paolina Garbeva
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
- * E-mail: (PG); (SJ)
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28
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Woźniak-Budych MJ, Przysiecka Ł, Langer K, Peplińska B, Jarek M, Wiesner M, Nowaczyk G, Jurga S. Green synthesis of rifampicin-loaded copper nanoparticles with enhanced antimicrobial activity. J Mater Sci Mater Med 2017; 28:42. [PMID: 28150115 DOI: 10.1007/s10856-017-5857-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 01/19/2017] [Indexed: 06/06/2023]
Abstract
The antimicrobial properties of copper and rifampicin-loaded copper nanoparticles were investigated using four strains: Staphylococcus aureus, Escherichia coli, Bacillus pumilis and Pseudomonas fluorescens. Spherical-shaped copper nanoparticles were synthesized via green reduction method from the peppermint extract. It was found that adsorption of rifampicin on the copper nanosurface enhances its biological activity and prevents the development of resistance. The interactions between rifampicin-copper nanoparticles and bacteria cells were monitored using atomic force microscopy (AFM) and confocal laser scanning microscopy (CLSM). It was proven that loaded with rifampicin copper nanoparticles were able to damage the S. aureus cell membrane and facilitate the bacteria biofilm matrix disintegration. Moreover, the DNA decomposition of S. aureus treated with copper and rifampicin-copper nanoparticles was confirmed by agarose gel electrophoresis. The results obtained indicate that adsorption of rifampicin on the copper nanoparticles surface might provide the reduction of antibiotic dosage and prevent its adverse side effects.
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Affiliation(s)
- Marta J Woźniak-Budych
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland.
| | - Łucja Przysiecka
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Krzysztof Langer
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Barbara Peplińska
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Marcin Jarek
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Maciej Wiesner
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Grzegorz Nowaczyk
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Stefan Jurga
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
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Carles L, Joly M, Bonnemoy F, Leremboure M, Batisson I, Besse-Hoggan P. Identification of sulfonylurea biodegradation pathways enabled by a novel nicosulfuron-transforming strain Pseudomonas fluorescens SG-1: Toxicity assessment and effect of formulation. J Hazard Mater 2017; 324:184-193. [PMID: 28340990 DOI: 10.1016/j.jhazmat.2016.10.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/19/2016] [Accepted: 10/21/2016] [Indexed: 06/06/2023]
Abstract
Nicosulfuron is a selective herbicide belonging to the sulfonylurea family, commonly used on maize culture. A bacterial strain SG-1 was isolated from an agricultural soil previously treated with nicosulfuron. This strain was identified as Pseudomonas fluorescens and is able to quantitatively dissipate 77.5% of nicosulfuron (1mM) at 28°C in the presence of glucose within the first day of incubation. Four metabolites were identified among which ASDM (2-(aminosulfonyl)-N,N-dimethyl-3-pyridinecarboxamide) and ADMP (2-amino-4,6-dimethoxypyrimidine) in substantial proportions, corresponding to the hydrolytic sulfonylurea cleavage. Two-phase dissipation kinetics of nicosulfuron by SG-1 were observed at the highest concentrations tested (0.5 and 1mM) due to biosorption. The extend and rate of formulated nicosulfuron transformation were considerably reduced compared to those with the pure active ingredient (appearance of a lag phase, 30% dissipation after 10days of incubation instead of 100% with the pure herbicide) but the same metabolites were observed. The toxicity of metabolites (standardized Microtox® test) showed a 20-fold higher toxicity of ADMP than nicosulfuron. P. fluorescens strain SG-1 was also able to biotransform two other sulfonylureas (metsulfuron-methyl and tribenuron-methyl) with various novel pathways. These results provide new tools for a comprehensive picture of the sulfonylurea environmental fate and toxicity of nicosulfuron in the environment.
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Affiliation(s)
- Louis Carles
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France; CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Muriel Joly
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Frédérique Bonnemoy
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Martin Leremboure
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Isabelle Batisson
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France.
| | - Pascale Besse-Hoggan
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, TSA 60026, CS 60026, 63178 Aubière Cedex, France.
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Rodríguez-López P, Carballo-Justo A, Draper LA, Cabo ML. Removal of Listeria monocytogenes dual-species biofilms using combined enzyme-benzalkonium chloride treatments. Biofouling 2017; 33:45-58. [PMID: 27918204 DOI: 10.1080/08927014.2016.1261847] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 11/08/2016] [Indexed: 06/06/2023]
Abstract
The effects of pronase (PRN), cellulase (CEL) or DNaseI alone or combined with benzalkonium chloride (BAC) against Listeria monocytogenes-carrying biofilms were assayed. The best removal activity against L. monocytogenes-Escherichia coli biofilms was obtained using DNaseI followed by PRN and CEL. Subsequently, a modified logistic model was used to quantify the combined effects of PRN or DNaseI with BAC. A better BAC performance after PRN compared to DNaseI eradicating L. monocytogenes was observed. In E. coli the effects were the opposite. Finally, effects of DNaseI and DNaseI-BAC treatments were compared against two different L. monocytogenes-carrying biofilms. DNaseI-BAC was more effective against L. monocytogenes when co-cultured with E. coli. Nonetheless, comparing the removal effects after BAC addition, these were higher in mixed-biofilms with Pseudomonas fluorescens. However, a high number of released viable cells was observed after combined treatments. These results open new perspectives of enzymes as an anti-biofilm strategy for environmental pathogen control.
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Affiliation(s)
- Pedro Rodríguez-López
- a Department of Microbiology and Technology of Marine Products , Instituto de Investigaciones Marinas (IIM-CSIC) , Pontevedra , Spain
- b Faculty of Biosciences, Department of Genetics and Microbiology , Autonomous University of Barcelona , Catalonia , Spain
| | - Alba Carballo-Justo
- a Department of Microbiology and Technology of Marine Products , Instituto de Investigaciones Marinas (IIM-CSIC) , Pontevedra , Spain
| | - Lorraine A Draper
- c APC Microbiome Institute , University College Cork , Cork , Ireland
| | - Marta L Cabo
- a Department of Microbiology and Technology of Marine Products , Instituto de Investigaciones Marinas (IIM-CSIC) , Pontevedra , Spain
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Oberoi AS, Philip L. Variation in toxicity during the biodegradation of various heterocyclic and homocyclic aromatic hydrocarbons in single and multi-substrate systems. Ecotoxicol Environ Saf 2017; 135:337-346. [PMID: 27770649 DOI: 10.1016/j.ecoenv.2016.10.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 10/10/2016] [Accepted: 10/13/2016] [Indexed: 06/06/2023]
Abstract
In the present study, an attempt was made to understand the variation in the toxicity during the biodegradation of aromatic hydrocarbons in single and multi-substrate system. The bacterial bioassay based on the inhibition of dehydrogenase enzyme activity of two different bacterial sp. E.coli and Pseudomonas fluorescens was used for toxicity assessment. Amongst the chosen pollutants, the highest acute toxicity was observed for benzothiophene followed by benzofuran having EC50 value of 16.60mg/L and 19.30mg/L respectively. Maximum residual toxicity of 30.8% was observed at the end during the degradation of benzothiophene. Due to the accumulation of transitory metabolites in both single and multisubstrate systems, reduction in toxicity was not proportional to the decrease in pollutant concentration. In multi-substrate system involving mixture of heterocyclic hydrocarbons, maximum residual toxicity of 39.5% was observed at the end of biodegradation. Enhanced degradation of benzofuran, benzothiophene and their metabolic intermediates were observed in the presence of naphthalene resulting in significant reduction in residual toxicity. 2 (1H) - quinolinone, an intermediate metabolite of quinoline was observed having significant eco-toxicity amongst all other intermediates investigated.
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Affiliation(s)
- Akashdeep Singh Oberoi
- Environmental and Water Resources Engineering Division, Department of Civil Engineering, IIT Madras, Chennai 600 036, India
| | - Ligy Philip
- Environmental and Water Resources Engineering Division, Department of Civil Engineering, IIT Madras, Chennai 600 036, India.
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32
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Myszka K, Schmidt MT, Białas W, Olkowicz M, Leja K, Czaczyk K. Role of gallic and p-coumaric acids in the AHL-dependent expression of flgA gene and in the process of biofilm formation in food-associated Pseudomonas fluorescens KM120. J Sci Food Agric 2016; 96:4037-4047. [PMID: 26710926 DOI: 10.1002/jsfa.7599] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 12/15/2015] [Accepted: 12/18/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND In the process of Pseudomonas fluorescens biofilm formation, N-acyl-l-homoserine lactone (AHL)-mediated flagella synthesis plays a key role. Inhibition of AHL production may attenuate P. fluorescens biofilm on solid surfaces. This work validated the anti-biofilm properties of p-coumaric and gallic acids via the ability of phenolics to suppress AHL synthesis in P. fluorescens KM120. The dependence between synthesis of AHL molecules, expression of flagella gene (flgA) and the ability of biofilm formation by P. fluorescens KM120 on a stainless steel surface (type 304L) was also investigated. RESULTS Research was carried out in a purpose-built flow cell device. Limitations on AHL synthesis in P. fluorescens KM120 were observed at concentrations of 120 and 240 µmol L(-1) of phenolic acids in medium. At such levels of gallic and p-coumaric acids the ability of P. fluorescens KM120 to synthesize 3-oxo-C6-homoserine lactone (HSL) was not observed. These concentrations caused decreased expression of flgA gene in P. fluorescens KM120. The changes in expression of AHL-dependent flgA gene significantly decreased the rate of microorganism colonization on the stainless steel surface. CONCLUSION Phenolic acids are able to inhibit biofilm formation. The results obtained in the work may help to develop alternative techniques for anti-biofilm treatment in the food industry. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Kamila Myszka
- Department of Biotechnology and Food Microbiology, Poznan University of Life Sciences, Wojska Polskiego 48, PL-60-627, Poznan, Poland
| | - Marcin T Schmidt
- Department of Biotechnology and Food Microbiology, Poznan University of Life Sciences, Wojska Polskiego 48, PL-60-627, Poznan, Poland
| | - Wojciech Białas
- Department of Biotechnology and Food Microbiology, Poznan University of Life Sciences, Wojska Polskiego 48, PL-60-627, Poznan, Poland
| | - Mariola Olkowicz
- Department of Biotechnology and Food Microbiology, Poznan University of Life Sciences, Wojska Polskiego 48, PL-60-627, Poznan, Poland
| | - Katarzyna Leja
- Department of Biotechnology and Food Microbiology, Poznan University of Life Sciences, Wojska Polskiego 48, PL-60-627, Poznan, Poland
| | - Katarzyna Czaczyk
- Department of Biotechnology and Food Microbiology, Poznan University of Life Sciences, Wojska Polskiego 48, PL-60-627, Poznan, Poland
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Harshiny M, Matheswaran M, Arthanareeswaran G, Kumaran S, Rajasree S. Enhancement of antibacterial properties of silver nanoparticles-ceftriaxone conjugate through Mukia maderaspatana leaf extract mediated synthesis. Ecotoxicol Environ Saf 2015; 121:135-41. [PMID: 25982731 DOI: 10.1016/j.ecoenv.2015.04.041] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 04/21/2015] [Accepted: 04/27/2015] [Indexed: 05/09/2023]
Abstract
Green synthesis of nanoparticles with low range of toxicity and conjugation to antibiotics has become an attractive area of research for several biomedical applications. Nanoconjugates exhibited notable increase in biological activity compared to free antibiotic molecules. With this perception, we report the biosynthesis of silver nanoparticles using aqueous extract of leaves of Mukia maderaspatana and subsequent conjugation of the silver nanoparticles to antibiotic ceftriaxone. The leaves of this plant are known to be a rich source of phenolic compounds with high antioxidant activity that are used as reducing agents. The size, morphology, crystallinity, composition of the synthesized silver nanoparticles and conjugation of ceftriaxone to silver nanoparticles were studied using analytical techniques. The activity of the conjugates against Bacillus subtilis (MTCC 1790), Klebsiella pneumoniae (MTCC 3384), Staphylococcus aureus (ATCC 25923), and Salmonella typhi (MTCC 3224) was compared to ceftriaxone and unconjugated nanoparticles using disc diffusion method. The effect of silver nanoparticles on the reduction of biofilms of Pseudomonas fluorescens (MTCC 6732) was determined by micro plate assay method. The antioxidant activities of extract, silver nitrate, silver nanoparticles, ceftriaxone and conjugates of nanoparticles were evaluated by radical scavenging 1, 1- diphenyl-2-picrylhydrazyl test. Ultraviolet visible spectroscopy and Fourier transform infrared spectroscopy confirmed the formation of metallic silver nanoparticles and conjugation to ceftriaxone. Atomic force microscopy, transmission electron microscopy and particle size analysis showed that the formed particles were of spherical morphology with appreciable nanosize and the conjugation was confirmed by slight increase in surface roughness. The results thus showed that the conjugation of ceftriaxone with silver nanoparticles has better antioxidant and antimicrobial effects than ceftriaxone and unconjugated nanoparticles. It can be suggested that M. maderaspatana mediated nanoparticle-ceftriaxone conjugate can be used effectively in the production of potential antioxidant and antimicrobial agents. The present study offers a significant overview to the development of novel antimicrobial nanoparticles.
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Affiliation(s)
- Muthukumar Harshiny
- Department of Chemical Engineering, National Institute of Technology, Tiruchirapalli 620015, India; CoRx Lifesciences And Pharmaceutical (CLAP) Private Limited, Tiruchirappalli 620020, India
| | - Manickam Matheswaran
- Department of Chemical Engineering, National Institute of Technology, Tiruchirapalli 620015, India
| | | | - Shanmugam Kumaran
- Department of Biotechnology, Periyar Maniammai University, Thanjavur 613403, India
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Cho ST, Chang HH, Egamberdieva D, Kamilova F, Lugtenberg B, Kuo CH. Genome Analysis of Pseudomonas fluorescens PCL1751: A Rhizobacterium that Controls Root Diseases and Alleviates Salt Stress for Its Plant Host. PLoS One 2015; 10:e0140231. [PMID: 26452056 PMCID: PMC4599888 DOI: 10.1371/journal.pone.0140231] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 09/22/2015] [Indexed: 01/05/2023] Open
Abstract
Pseudomonas fluorescens PCL1751 is a rod-shaped Gram-negative bacterium isolated from the rhizosphere of a greenhouse-grown tomato plant in Uzbekistan. It controls several plant root diseases caused by Fusarium fungi through the mechanism of competition for nutrients and niches (CNN). This mechanism does not rely on the production of antibiotics, so it avoids the concerns of resistance development and is environmentally safe. Additionally, this bacterium promotes plant growth by alleviating salt stress for its plant host. To investigate the genetic mechanisms that may explain these observations, we determined the complete genome sequence of this bacterium, examined its gene content, and performed comparative genomics analysis with other Pseudomonas strains. The genome of P. fluorescens PCL1751 consisted of one circular chromosome that is 6,143,950 base-pairs (bp) in size; no plasmid was found. The annotation included 19 rRNA, 70 tRNA, and 5,534 protein-coding genes. The gene content analysis identified a large number of genes involved in chemotaxis and motility, colonization of the rhizosphere, siderophore biosynthesis, and osmoprotectant production. In contrast, the pathways involved in the biosynthesis of phytohormones or antibiotics were not found. Comparison with other Pseudomonas genomes revealed extensive variations in their genome size and gene content. The presence and absence of secretion system genes were highly variable. As expected, the synteny conservation among strains decreased as a function of phylogenetic divergence. The integration of prophages appeared to be an important driver for genome rearrangements. The whole-genome gene content analysis of this plant growth-promoting rhizobacterium (PGPR) provided some genetic explanations to its phenotypic characteristics. The extensive and versatile substrate utilization pathways, together with the presence of many genes involved in competitive root colonization, provided further support for the finding that this strain achieves biological control of pathogens through effective competition for nutrients and niches.
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Affiliation(s)
- Shu-Ting Cho
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
| | - Hsing-Hua Chang
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
| | - Dilfuza Egamberdieva
- Institute for Landscape Biogeochemistry, Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder str. 84, Müncheberg, Germany
| | - Faina Kamilova
- Koppert Biological Systems, Veilingweg 14, 2651 BE Berkel en Rodenrijs, the Netherlands
| | - Ben Lugtenberg
- Institute of Biology, Sylvius Laboratory, Leiden University, Leiden, the Netherlands
| | - Chih-Horng Kuo
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, National Chung Hsing University and Academia Sinica, Taipei, Taiwan
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung, Taiwan
- * E-mail:
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Xu YB, Xu JX, Chen JL, Huang L, Zhou SQ, Zhou Y, Wen LH. Antioxidative responses of Pseudomonas fluorescens YZ2 to simultaneous exposure of Zn and Cefradine. Ecotoxicology 2015; 24:1788-1797. [PMID: 26141733 DOI: 10.1007/s10646-015-1516-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/24/2015] [Indexed: 06/04/2023]
Abstract
Binary pollution of both heavy metals and antibiotics has received increasing attentions for their joint effects of eco-toxicity and health hazards. To reveal the effects of mixtures of different pollutants on bacterial antioxidant response system, Pseudomonas fluorescens ZY2, a new strain isolated from swine wastewater, was chosen to determinate growth (bacterial density OD600), reactive oxygen species (ROS) concentration, protein concentration and superoxide dismutase (SOD) activity under exposure treatments of Zn, Cefradine or Zn + Cefradine. Bacterial densities of all the treatment groups increased significantly over the incubation time, but those containing pollutant addition were slightly lower than the control at different times of incubation. Both ROS concentration and SOD activity increased first and then decreased (p < 0.01) over time, which was opposite to the protein concentrations (p < 0.01), showing a much significant increase by Cefradine alone. With Zn concentration increasing from 40 to 160 mg/L, the intracellular SOD activity increased as a response to the improvement of ROS (p < 0.05), while the balance between ROS and SOD was broken down due to the disproportionate change of total SOD activity and ROS concentration, the bacterial densities therefore decreased for the weak resistance. With the combined treatment of Zn (200 mg/L) and Cefradine (1 mg/L), though the toxicity of Zn caused a much significant increase of ROS, the bacterial resistance was further improved showing a more significant increase of total SOD activity and the bacterial densities therefore increased bacterial growth. Zn concentration also affected the protein synthesis. Either single or binary stress induced the bacterial resistance by regulating SOD activity to eliminate ROS. All results of the bacterial oxidant stress, SOD response and protein synthesis in the combined treatment groups were more complicated than those in single treatment groups, which depended on the properties of the single treatment as well as the interaction between the two treatments upon bacterial activity. For P. fluorescens ZY2, the mediation of SOD activity to eliminate ROS in response to the combined exposure to Zn and Cefradine was first revealed as one of the co-resistance mechanisms, which is informative to further understanding the risk of antibiotics resistant bacteria to human and environmental health more accurately.
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Affiliation(s)
- Yan-Bin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.
- College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510006, People's Republic of China.
- State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, 510641, People's Republic of China.
- Key Laboratory of Environmental Protection and Eco-remediation of Guangdong Regular Higher Education Institutions, Guangzhou Higher Education Mega Center, South China University of Technology, Guangzhou, 510006, People's Republic of China.
| | - Jia-Xin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China
| | - Jin-Liang Chen
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China
| | - Lu Huang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China
| | - Shao-Qi Zhou
- College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510006, People's Republic of China.
- State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, 510641, People's Republic of China.
- Key Laboratory of Environmental Protection and Eco-remediation of Guangdong Regular Higher Education Institutions, Guangzhou Higher Education Mega Center, South China University of Technology, Guangzhou, 510006, People's Republic of China.
- Guizhou Academy of Sciences, Shanxi Road 1#, Guiyang, 550001, People's Republic of China.
| | - Yan Zhou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China
| | - Li-Hua Wen
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China
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Xu YB, Zhou Y, Ruan JJ, Xu SH, Gu JD, Huang SS, Zheng L, Yuan BH, Wen LH. Endogenous nitric oxide in Pseudomonas fluorescens ZY2 as mediator against the combined exposure to zinc and cefradine. Ecotoxicology 2015; 24:835-843. [PMID: 25678231 DOI: 10.1007/s10646-015-1428-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/05/2015] [Indexed: 06/04/2023]
Abstract
A better understanding on the mechanism involved in bacterial resistance to combined exposure to antibiotics and heavy metals is helpful in implementing practices to mitigate their ecological risk and spread of resistance genes in microbial population. Pseudomonas fluorescens ZY2, a strain isolated from swine wastewater, was chosen to study its growth (bacterial density OD600), the formation of reactive oxygen species (ROS), nitric oxide (NO) and NO synthases (NOS) under Zn, cefradine or Zn + cefradine treatments. Using Zn and cefradine as representative heavy metal and antibiotic in this investigation, respectively, the resistance of P. fluorescens ZY2 to toxic chemical exposure was investigated. Bacterial densities of treatment groups significantly increased over the time of incubation, but less than the control. ROS, NO and NOS initially increased, but then decreased after the initial 8 h of culturing, and were positively related to Zn concentrations. Moreover, the formation of ROS, NOS, and NO was activated by cefradine at Zn of up to 160 mg/L, but inhibited at Zn of 200 mg/L whether cefradine was added or not. Zn concentration affected ROS and NO concentrations between treatments and also was closely related to the variation of the relative bacterial density. For P. fluorescens ZY2, the mediation of endogenous NO to overcome ROS in response to the combined exposure of Zn and cefradine was suggested as a co-resistance mechanism, which would be beneficial to evaluate the ecological risk of heavy metals and antibiotics.
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Affiliation(s)
- Yan-Bin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China,
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Cornelis P, Moguilevsky N, Jacques JF, Masson PL. Study of the siderophores and receptors in different clinical isolates of Pseudomonas aeruginosa. Antibiot Chemother (1971) 2015; 39:290-306. [PMID: 2823691 DOI: 10.1159/000414354] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- P Cornelis
- Catholic University of Louvain, Faculty of Medicine, Brussels, Belgium
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Zhou Y, Xu YB, Xu JX, Zhang XH, Xu SH, Du QP. Combined toxic effects of heavy metals and antibiotics on a Pseudomonas fluorescens strain ZY2 isolated from swine wastewater. Int J Mol Sci 2015; 16:2839-50. [PMID: 25633105 PMCID: PMC4346868 DOI: 10.3390/ijms16022839] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 01/07/2015] [Accepted: 01/14/2015] [Indexed: 11/20/2022] Open
Abstract
A Pseudomonas fluorescens strain ZY2, isolated from swine wastewater, was used to investigate the synergistic effects of five heavy metals (Pb, Cu, Zn, Cr(VI) and Hg) on bacterial resistance to antibiotics. Results indicate that the combined effects of antibiotic type, heavy metal type and concentration were significant (p < 0.01). Cross-resistance to Hg and antibiotics was the most noticeable. Moreover, the resistance to Hg and cefradine or amoxicillin, and Cr and amoxicillin were synergistic for low heavy metal concentrations, and turned antagonistic with increasing concentrations, while the resistances to Cr or Cu and cefradine, Pb or Cu and amoxicillin, Cu and norfloxacin showed reverse effects. In addition, resistance to Zn and amoxicillin were always synergetic, while resistance to Pb and cefradine or norfloxacin, Cr or Hg and norfloxacin as well as all the heavy metals and tetracycline were antagonistic. These results indicate that bacterial resistance to antibiotics can be affected by the type and concentration of co-exposed heavy metals and may further threaten people’s health and ecological security severely via horizontal gene transfer.
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Affiliation(s)
- Yan Zhou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Yan-Bin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Jia-Xin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Xiao-Hua Zhang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Shi-Hui Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Qing-Ping Du
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
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Poirier I, Kuhn L, Caplat C, Hammann P, Bertrand M. The effect of cold stress on the proteome of the marine bacterium Pseudomonas fluorescens BA3SM1 and its ability to cope with metal excess. Aquat Toxicol 2014; 157:120-133. [PMID: 25456226 DOI: 10.1016/j.aquatox.2014.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Revised: 08/06/2014] [Accepted: 10/04/2014] [Indexed: 06/04/2023]
Abstract
This study examined the effect of cold stress on the proteome and metal tolerance of Pseudomonas fluorescens BA3SM1, a marine strain isolated from tidal flat sediments. When cold stress (+10 °C for 36 h) was applied before moderate metal stress (0.4 mM Cd, 0.6 mM Cd, 1.5 mM Zn, and 1.5 mM Cu), growth disturbances induced by metal, in comparison with respective controls, were reduced for Cd and Zn while they were pronounced for Cu. This marine strain was able to respond to cold stress through a number of changes in protein regulation. Analysis of the predicted differentially expressed protein functions demonstrated that some mechanisms developed under cold stress were similar to those developed in response to Cd, Zn, and Cu. Therefore, pre-cold stress could help this strain to better counteract toxicity of moderate concentrations of some metals. P. fluorescens BA3SM1 was able to remove up to 404.3 mg Cd/g dry weight, 172.5 mg Zn/g dry weight, and 11.3 mg Cu/g dry weight and its metal biosorption ability seemed to be related to the bacterial growth phase. Thus, P. fluorescens BA3SM1 appears as a promising agent for bioremediation processes, even at low temperatures.
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Affiliation(s)
- Isabelle Poirier
- Microorganismes Métaux et Toxicité, Institut National des Sciences et Techniques de la Mer, Conservatoire National des Arts et Métiers, BP 324, 50103 Cherbourg-Octeville Cedex, France.
| | - Lauriane Kuhn
- Plateforme Protéomique Strasbourg Esplanade, CNRS FRC1589, Institut de Biologie Moléculaire et Cellulaire, 15 rue Descartes, 67084 Strasbourg Cedex, France
| | - Christelle Caplat
- UMR BOREA, Université de Caen Basse-Normandie, Esplanade de la Paix, BP 5186, 14032 Caen Cedex, France
| | - Philippe Hammann
- Plateforme Protéomique Strasbourg Esplanade, CNRS FRC1589, Institut de Biologie Moléculaire et Cellulaire, 15 rue Descartes, 67084 Strasbourg Cedex, France
| | - Martine Bertrand
- Microorganismes Métaux et Toxicité, Institut National des Sciences et Techniques de la Mer, Conservatoire National des Arts et Métiers, BP 324, 50103 Cherbourg-Octeville Cedex, France
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Abstract
Microbial activity during the holding and reuse of wastewater from hydraulic fracturing operations, termed produced water, may lead to issues with corrosion, sulfide release, and fouling. Biocides are applied to control biological activity, often with limited efficacy, which is typically attributed to chemical interactions with the produced water. However, it is unknown whether there is a biologically driven mechanism to biocide tolerance in produced water. Here, we demonstrate that produced water exposure results in an enhanced tolerance against the typically used biocide glutaraldehyde and increased susceptibility to the oxidative biocide hypochlorite in a native and a model bacteria and that this altered resistance is due to the salinity of the produced water. In addition, we elucidate the genetic response of the model organism Pseudomonas fluorescens to produced water exposure to provide a mechanistic interpretation of the altered biocide resistance. The RNA-seq data demonstrated the induction of genes involved in osmotic stress, energy production and conversion, membrane integrity, and protein transport following produced water exposure, which facilitates bacterial survival and alters biocide tolerance. Efforts to fundamentally understand biocide resistance mechanisms, which enable the optimization of biocide application, hold significant implications for greening of the fracturing process through encouraging produced water recycling. Specifically, these results suggest the necessity of optimizing biocide application at the level of individual shale plays, rather than historical experience, based upon produced water characteristics and salinity.
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Affiliation(s)
- Amit Vikram
- Department of Civil and Environmental Engineering, and §Department of Computational and Systems Biology, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
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Lynch F, Tomlinson S, Palombo EA, Harding IH. An epifluorescence-based evaluation of the effects of short-term particle association on the chlorination of surface water bacteria. Water Res 2014; 63:199-208. [PMID: 25003212 DOI: 10.1016/j.watres.2014.06.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 06/11/2014] [Accepted: 06/13/2014] [Indexed: 06/03/2023]
Abstract
Investigations into particle-mediated chlorination resistance were undertaken for three different bacteria (Escherichia coli ATCC 25922 and environmental isolates of Pseudomonas fluorescens and Serratia marcescens) and three different surfaces (goethite, environmental particles and surface-modified environmental particles). P. fluorescens demonstrated greater hydrophobicity than both other strains and proved the most adherent bacterium over all substrata investigated. Particle-mediated resistance to chlorination was investigated using short bacteria-particle association times and activity assays that employed sensitive epifluorescent detection. Consistent with adhesive behaviours, the bacterial strain that demonstrated the greatest particle-mediated chlorination resistance was the environmental strain of P. fluorescens. Resistance was observed to vary with both bacteria and particle type, and demonstrated a moderate correlation with adhesion (r(2) ≥ 0.65). The short-term approach employed in our study demonstrates particle-mediated protection without the commonly assumed requirements of extracellular polymeric substances (EPS) or a large particle-based chlorine demand. Consequently, we have linked resistance with adhesion capacities and demonstrated a limit to resistance in the presence of additional particle protective sites (through increased turbidity) which appears to be driven by intra-population variance in bacterial surface characteristics. Finally, we observed important differences between behaviours of environmental versus laboratory-derived bacterial strains and particles, which highlight the importance of employing both approaches in characterising "real world" systems.
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Affiliation(s)
- Fiona Lynch
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn 3122, Australia.
| | - Steven Tomlinson
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn 3122, Australia
| | - Enzo A Palombo
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn 3122, Australia
| | - Ian H Harding
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn 3122, Australia
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Yang M, Wu H, Lian Y, Li X, Lai F, Zhao G. Influence of organic solvents on catalytic behaviors and cell morphology of whole-cell biocatalysts for synthesis of 5'-arabinocytosine laurate. PLoS One 2014; 9:e104847. [PMID: 25136983 PMCID: PMC4138074 DOI: 10.1371/journal.pone.0104847] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 07/17/2014] [Indexed: 11/21/2022] Open
Abstract
A whole-cell based method was developed for the regioselective synthesis of arabinocytosine laurate. Among the seven kinds of bacteria strains tested in the acylation reaction, Pseudomonas fluorescens gave the highest productivity and a higher 5′-regioselectivity than 99%. Compared with pure organic solvents, the use of organic solvent mixtures greatly promoted the yield of the whole-cell catalyzed reaction, but showed little influence on the 5′-regioselectivity. Of all the tested solvent mixtures, the best reaction result was found in isopropyl ether/pyridine followed by isopentanol/pyridine. However, the whole-cells showed much lower thermostability in isopropyl ether/pyridine than in THF-pyridine. To better understand the toxic effects of the organic solvents on P. fluorescens whole-cells and growing cells were further examined. Significant influences of organic solvents on the biomass of the cells were found, which differed depending on the type of solvents used. SEM analysis visually revealed the changes in the surface morphology of whole-cells and growing cells cultured in media containing various organic solvents, in terms of surface smoothness, bulges and changed cell sizes. Results demonstrated that organic toxicity to cell structure played an important role in whole-cell mediated catalysis.
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Affiliation(s)
- Meiyan Yang
- State Key Lab of Pulp & Paper Making Engineering, South China University of Technology, Guangzhou, China
- College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, China
| | - Hui Wu
- College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, China
| | - Yan Lian
- College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, China
| | - Xiaofeng Li
- State Key Lab of Pulp & Paper Making Engineering, South China University of Technology, Guangzhou, China
- * E-mail: (XL); (GZ)
| | - Furao Lai
- College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, China
| | - Guanglei Zhao
- State Key Lab of Pulp & Paper Making Engineering, South China University of Technology, Guangzhou, China
- * E-mail: (XL); (GZ)
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Appanna VP, Auger C, Thomas SC, Omri A. Fumarate metabolism and ATP production in Pseudomonas fluorescens exposed to nitrosative stress. Antonie Van Leeuwenhoek 2014; 106:431-8. [PMID: 24923559 DOI: 10.1007/s10482-014-0211-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 06/03/2014] [Indexed: 12/11/2022]
Abstract
Although nitrosative stress is known to severely impede the ability of living systems to generate adenosine triphosphate (ATP) via oxidative phosphorylation, there is limited information on how microorganisms fulfill their energy needs in order to survive reactive nitrogen species (RNS). In this study we demonstrate an elaborate strategy involving substrate-level phosphorylation that enables the soil microbe Pseudomonas fluorescens to synthesize ATP in a defined medium with fumarate as the sole carbon source. The enhanced activities of such enzymes as phosphoenolpyruvate carboxylase and pyruvate phosphate dikinase coupled with the increased activities of phospho-transfer enzymes like adenylate kinase and nucleoside diphophate kinase provide an effective strategy to produce high energy nucleosides in an O2-independent manner. The alternate ATP producing machinery is fuelled by the precursors derived from fumarate with the aid of fumarase C and fumarate reductase. This metabolic reconfiguration is key to the survival of P. fluorescens and reveals potential targets against RNS-resistant organisms.
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Affiliation(s)
- Varun P Appanna
- Department of Biology, Laurentian University, Sudbury, ON, P3E2C6, Canada
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44
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Igbeneghu OA, Abdu AB. Multiple antibiotic-resistant bacteria on fluted pumpkin leaves, a herb of therapeutic value. J Health Popul Nutr 2014; 32:176-82. [PMID: 25076655 PMCID: PMC4216954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Fluted pumpkin (Telfairia occidentalis) is a minimally-processed green leafy vegetable traditionally used for its antianaemic properties in the form of leaf juice without a heating or inactivation step before consumption. The aim of the study was to assess the presence of surface microbiota on T. occidentalis leaves and also to determine the antimicrobial susceptibility of isolated organisms. Bacterial contaminants on 50 samples of T. occidentalis leaves were isolated and characterized using standard biochemical methods and the antimicrobial susceptibility of isolated organisms was determined using the antibiotic disc diffusion assay. The results obtained show that the leaves of T. occidentalis is contaminated with organisms which included Enterobacter agglomerans (25.9%), Proteus vulgaris (24.9%), Klebsiella spp. (2.6%), and Serratia liquefaciens (2.1%). Other bacterial isolates recovered in order of frequency included: Staphylococcus spp. (33.7%), Bacillus spp. (8.3%), and Pseudomonas fluorescens (2.6%). Of the 193 bacterial isolates from the leaves of T. occidentalis samples tested for antimicrobial resistance, all (100%) were found to be resistant to ampicillin, cloxacillin, augmentin, erythromycin, and tetracycline while 96% of the isolates were resistant to cephalothin. Resistance to trimethoprim (93%) and gentamicin (83%) was also observed. Approximately, 22% of the isolates were resistant to ciprofloxacin; however, only 11 (5.8%) were resistant to ofloxacin. Thus, uncooked T. occidentalis is a potential source of highly-resistant epiphytic bacteria which could be opportunistic pathogens in consumers.
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Affiliation(s)
- Oluwatoyin A. Igbeneghu
- Department of Pharmaceutics, Faculty of Pharmacy, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria
| | - Abdulrasheed B. Abdu
- Department of Medical Microbiology and Parasitology, Faculty of Basic Medical Sciences, College of Health Sciences, Niger Delta University, Wilberforce Island, Bayelsa-State, Nigeria
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Akiyama K, Maruyama M, Yamauchi S, Nakashima Y, Nakato T, Tago R, Sugahara T, Kishida T, Koba Y. Antimicrobiological Activity of Lignan: Effect of Benzylic Oxygen and Stereochemistry of 2,3-Dibenzyl-4-butanolide and 3,4-Dibenzyltetrahydrofuran Lignans on Activity. Biosci Biotechnol Biochem 2014; 71:1745-51. [PMID: 17617715 DOI: 10.1271/bbb.70168] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The effect of oxidation degree at the benzylic position of 2,3-dibenzyl-4-butanolide and 3,4-dibenzyltetrahydrofuran lignans on the antimicrobiological activity was examined. The highest oxidation degree at the benzylic position of 2,3-dibenzyl-4-butanolide gave the greatest activity, and 3,4-dibenzoyltetrahydrofuran showed the highest antifungal activity. The relationship between stereochemistry and activity was also examined. Both enantiomers of cis-matairesinol were synthesized for the first time, one of the cis-matairesinols showing antibacterial activity.
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Affiliation(s)
- Koichi Akiyama
- Integrated Center for Sciences, Ehime University, Matsuyama, Ehime, Japan
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46
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Araújo PA, Mergulhão F, Melo L, Simões M. The ability of an antimicrobial agent to penetrate a biofilm is not correlated with its killing or removal efficiency. Biofouling 2014; 30:675-683. [PMID: 24773258 DOI: 10.1080/08927014.2014.904294] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The penetration ability of 12 antimicrobial agents, including antibiotics and biocides, was determined against biofilms of B. cereus and P. fluorescens using a colony biofilm assay. The surfactants benzalkonium chloride (BAC) and cetyltrimethyl ammonium bromide (CTAB), and the antibiotics ciprofloxacin and streptomycin were of interest due to their distinct activities. Erythromycin and CTAB were retarded by the presence of biofilms, whereas ciprofloxacin and BAC were not. The removal and killing efficacies of these four agents was additionally evaluated against biofilms formed in microtiter plates. The most efficient biocide was CTAB for both bacterial biofilms. Ciprofloxacin was the best antibiotic although none of the selected antimicrobial agents led to total biofilm removal and/or killing. Comparative analysis of the results obtained with colony biofilms and microtiter plate biofilms show that although extracellular polymeric substances and the biofilm structure are considered a determining factor in biofilm resistance, the ability of an antimicrobial agent to penetrate a biofilm is not correlated with its killing or removal efficiency. Also, the results reinforce the role of an appropriate antimicrobial selection as a key step in the design of disinfection processes for biofilm control.
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Affiliation(s)
- Paula A Araújo
- a LEPABE, Faculty of Engineering, Department of Chemical Engineering , University of Porto , Porto , Portugal
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47
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Eom GT, Song JK. Enhanced production of ATP-binding cassette protein exporter-dependent lipase by modifying the growth medium components of Pseudomonas fluorescens. Biotechnol Lett 2014; 36:1687-92. [PMID: 24737082 DOI: 10.1007/s10529-014-1528-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 04/01/2014] [Indexed: 11/26/2022]
Abstract
The industrially-important thermostable lipase, TliA, was extracellularly produced in the recombinant Pseudomonas fluorescens by the homologous expression of TliA and its cognate ABC protein exporter, TliDEF. To increase the secretory production of TliA, we optimized the growth temperature and the culture medium of P. fluorescens. The total amount and the specific productivity of lipase was highest at 25 °C of cell growth temperature, although maximal cell growth was observed at 30 °C. Using the culture medium composed of 20 g dextrin l(-1), 40 g Tween 80 l(-1) and 30 g peptone l(-1), TliA was produced at a level of 2,200 U ml(-1) in a flask culture. The TliA production increased about 3.8-fold (8,450 U ml(-1)) in batch fermentation using a 2.5 l fermentor, which was about 7.7-fold higher than that of previously reported TliA production.
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Affiliation(s)
- Gyeong Tae Eom
- Research Center for Bio-based Chemistry, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon, 305-600, Republic of Korea
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48
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Wang F, Yao J, Chen H, Yi Z, Yu C, Tuo Y, Ma L, Yu Q. Evaluate the heavy metal toxicity to Pseudomonas fluorescens in a low levels of metal-chelates minimal medium. Environ Sci Pollut Res Int 2014; 21:9278-9286. [PMID: 24723355 DOI: 10.1007/s11356-014-2884-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Accepted: 04/02/2014] [Indexed: 06/03/2023]
Abstract
A 2-(n-morpholino)ethane sulfonic acid (MES)-buffered minimal medium with low levels of metal chelates was used to evaluate the heavy metal (Co+2, Pb+2, Zn+2, Fe+2, Fe+3, Cd+2, Cu+2, and Cr+6) toxicity to Pseudomonas fluorescens through minimizing the limitation of the existing medium. The interaction between bacteria and heavy metals was real-time monitored by microcalorimetry and reflected by thermogenic curves. Compared with the main parameters, microbial growth rate constant k and total heat evolution Q total, a general order of toxicity was found to be Fe+3<Co+2<Fe+2<Cu+2<Cr+6<Zn+2<Pb+2<Cd+2. The main metal speciation was Co+2, Zn+2, Fe+2, Cd+2, PbOH+, Fe(OH)+2, CuOH+, HCrO4-, and CrO4(-2) at pH 6.4. These metal speciations are main factors to exhibit the metal toxicity to bacteria. To validate their interaction, the surface chemical functional groups of P. fluorescens biomass identified by Fourier transform infrared (FTIR) were amino, carboxyl, hydroxyl, and phosphoryl groups, which maybe involved in the biosorption of metal ions.
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Affiliation(s)
- Fei Wang
- School of Civil and Environmental Engineering and National International Cooperation Based on Environment and Energy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, People's Republic of China
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49
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Safari A, Habimana O, Allen A, Casey E. The significance of calcium ions on Pseudomonas fluorescens biofilms - a structural and mechanical study. Biofouling 2014; 30:859-869. [PMID: 25115520 DOI: 10.1080/08927014.2014.938648] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The purpose of this study was to investigate the effects of calcium ions on the structural and mechanical properties of Pseudomonas fluorescens biofilms grown for 48 h. Advanced investigative techniques such as confocal laser scanning microscopy and atomic force spectroscopy were employed to characterize biofilm structure as well as biofilm mechanical properties following growth at different calcium concentrations. The presence of calcium during biofilm development led to higher surface coverage with distinct structural phenotypes in the form of a granular and heterogeneous surface, compared with the smoother and homogeneous biofilm surface in the absence of calcium. The presence of calcium also increased the adhesive nature of the biofilm, while reducing its elastic properties. These results suggest that calcium ions could have a functional role in biofilm development and have practical implications, for example, in analysis of biofouling in membrane-based water-treatment processes such as nanofiltration or reverse osmosis where elevated calcium concentrations may occur at the solid-liquid interface.
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Affiliation(s)
- Ashkan Safari
- a School of Chemical and Bioprocess Engineering , University College Dublin (UCD) , Belfield , Dublin , Ireland
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Nagai K, Murata T, Ohta S, Zenda H, Ohnishi M, Hayashi T. Two Different Mechanisms Are Involved in the Extremely High-Level Benzalkonium Chloride Resistance of aPseudomonas fluorescensStrain. Microbiol Immunol 2013; 47:709-15. [PMID: 14605437 DOI: 10.1111/j.1348-0421.2003.tb03440.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A Pseudomonas fluorescens strain, PFRB, which we previously isolated as a contaminant in a batch of benzalkonium chloride (BAC) stock solution, exhibits high-level resistance, not only to BAC, but also to other cationic surfactants belonging to disinfectants classified as quaternary ammonium compounds (QACs). In this study, we analyzed the resistance mechanism of the strain to BAC and other disinfectants. We obtained results suggesting that two different mechanisms, reduced adsorption of BAC to the cell surface and an energy-dependent mechanism which is most probably an efflux system, were implicated in the high-level resistance to BAC. Reduced adsorption of BAC is likely due to the decreased negative cell surface charge of the strain. The putative efflux system seems to be unique in that it excretes only a certain range of cationic membrane-acting disinfectants belonging to QACs.
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Affiliation(s)
- Katsuhiro Nagai
- Department of Pharmacy, Shinshu University Hospital, Matsumoto, Nagano 390-8621, Japan
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