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Biofilm

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https://www.readbyqxmd.com/read/28926981/antibiofilm-activity-and-mechanism-of-action-of-the-disinfectant-chloramine-t-on-candida-spp-and-its-toxicity-against-human-cells
#1
Gabriela Lacet Silva Ferreira, Pedro Luiz Rosalen, Larissa Rangel Peixoto, Ana Luiza Alves de Lima Pérez, Fabíola Galbiatti de Carvalho Carlo, Lúcio Roberto Cançado Castellano, Jefferson Muniz de Lima, Irlan Almeida Freires, Edeltrudes de Oliveira Lima, Ricardo Dias de Castro
We evaluated the antifungal and anti-biofilm activity, mechanism of action and cytotoxicity of chloramine T trihydrate (CAT) against Candida spp. The Minimum Inhibitory and Fungicidal Concentrations (MIC/MFC) of CAT were determined. Changes in CAT-treated C. albicans growth kinetics and micromorphology were evaluated, as well as the mechanism of action, and its effects on biofilm. Cytotoxicity was assessed by the hemolysis method. The data were analyzed by inferential statistics (p ≤ 0.05). CAT showed antifungal activity against all strains, with MIC values ranging between 1...
September 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28926942/the-semi-synthetic-peptide-lin-sb056-1-in-combination-with-edta-exerts-strong-antimicrobial-and-antibiofilm-activity-against-pseudomonas-aeruginosa-in-conditions-mimicking-cystic-fibrosis-sputum
#2
Giuseppantonio Maisetta, Lucia Grassi, Semih Esin, Ilaria Serra, Mariano A Scorciapino, Andrea C Rinaldi, Giovanna Batoni
Pseudomonas aeruginosa is a major cause of chronic lung infections in cystic fibrosis (CF) patients. The ability of the bacterium to form biofilms and the presence of a thick and stagnant mucus in the airways of CF patients largely contribute to antibiotic therapy failure and demand for new antimicrobial agents able to act in the CF environment. The present study investigated the anti-P. aeruginosa activity of lin-SB056-1, a recently described semi-synthetic antimicrobial peptide, used alone and in combination with the cation chelator ethylenediaminetetraacetic acid (EDTA)...
September 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28926915/bioelectrochemical-methane-ch4-production-in-anaerobic-digestion-at-different-supplemental-voltages
#3
Kwang-Soon Choi, Sanath Kondaveeti, Booki Min
Microbial electrolysis cells (MECs) at various cell voltages (0.5, 0.7 1.0 and 1.5V) were operated in anaerobic fermentation. During the start-up period, the cathode potential decreased from -0.63 to -1.01V, and CH4 generation increased from 168 to 199ml. At an applied voltage of 1.0V, the highest methane yields of 408.3ml CH4/g COD glucose was obtained, which was 30.3% higher than in the control tests (313.4ml CH4/g COD glucose). The average current of 5.1mA was generated at 1.0V at which the maximum methane yield was obtained...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28926787/a-novel-a-b-process-for-enhanced-biological-nutrient-removal-in-municipal-wastewater-reclamation
#4
Guangjing Xu, Han Wang, Jun Gu, Nan Shen, Zheng Qiu, Yan Zhou, Yu Liu
This study developed an innovative A-B process for enhanced nutrients removal in municipal wastewater reclamation, in which a micro-aerated moving bed biofilm reactor served as A-stage and a step-feed sequencing batch reactor (SBR) as B-stage. In the A-stage, 55% of COD and 15% of ammonia nitrogen was removed, while more than 88% of the total nitrogen was removed via nitritation and denitritation, together with 93% of phosphorous removal at the B-stage where ammonia oxidizing bacteria activity was significantly higher than nitrite oxidizing bacteria activity...
September 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28926554/erratum-a-vibrio-cholerae-autoinducer-receptor-pair-that-controls-biofilm-formation
#5
Kai Papenfort, Justin E Silpe, Kelsey R Schramma, Jian-Ping Cong, Mohammad R Seyedsayamdost, Bonnie L Bassler
No abstract text is available yet for this article.
September 19, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28926551/erratum-a-vibrio-cholerae-autoinducer-receptor-pair-that-controls-biofilm-formation
#6
Kai Papenfort, Justin E Silpe, Kelsey R Schramma, Jian-Ping Cong, Mohammad R Seyedsayamdost, Bonnie L Bassler
No abstract text is available yet for this article.
September 19, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28926339/flipping-the-switch
#7
Xavier Pierrat, Alexandre Persat
A structural switch controls the architecture of Vibrio cholerae biofilms by mediating the interactions between two matrix components.
September 19, 2017: ELife
https://www.readbyqxmd.com/read/28926236/biofilms-benefiting-plants-exposed-to-zno-and-cuo-nps-studied-with-a-root-mimetic-hollow-fiber-membrane
#8
Michelle Bonebrake, Kaitlyn C Anderson, Jonathan Valiente, Astrid Rosa Jacobson, Joan E McLean, Anne J Anderson, David W Britt
Plants exist with a consortium of microbes that influence plant health, including response to biotic and abiotic stress. While nanoparticle (NP) - plant interactions are increasingly studied, the effect of NPs on the plant microbiome is less researched. Here a root-mimetic hollow fiber membrane (HFM) is presented for generating biofilms of plant-associated microbes nurtured by artificial root exudates (AREs) to correlate exudate composition with biofilm formation and response to NPs. Two microbial isolates from field-grown wheat, a bacillus endophyte and a pseudomonad root surface colonizer, were examined on HFMs fed with AREs varying in N and C composition...
September 19, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28926192/testing-of-a-bioactive-moldable-bone-graft-substitute-in-an-infected-critically-sized-segmental-defect-model
#9
Matt E Brown, Yuan Zou, Rebecca Peyyala, Sarandeep S Huja, Larry L Cunningham, Todd A Milbrandt, Thomas D Dziubla, David A Puleo
Large infected bone defects, often resulting from high energy traumas, are difficult to treat due to their variability in complexity and location. Standard treatment for infected bone defects begins with a protocol that includes a series of debridements in conjunction with an extended course of systemic antibiotics. Only after the infection has been eliminated will repair of the defect commence, typically with implantation of autologous bone. To address some of the shortcomings of the standard treatment methods, such as serial procedures, limited grafting material, and the need for a second surgical site for autologous bone, a sequential, dual drug-releasing, moldable, calcium sulfate-based bone graft substitute was developed previously...
September 19, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28926148/biodiversity-and-species-competition-regulate-the-resilience-of-microbial-biofilm-community
#10
Kai Feng, Zhaojing Zhang, Weiwei Cai, Wenzong Liu, Meiying Xu, Huaqun Yin, Aijie Wang, Zhili He, Ye Deng
The relationship between biodiversity and ecosystem stability is poorly understood in microbial communities. Biofilm communities in small bioreactors called microbial electrolysis cells (MEC) contain moderate species numbers and easy tractable functional traits, thus providing an ideal platform for verifying ecological theories in microbial ecosystems. Here, we investigated the resilience of biofilm communities with a gradient of diversity, and explored the relationship between biodiversity and stability in response to a pH shock...
September 19, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28925959/preventing-surgical-site-infections-using-a-natural-biodegradable-antibacterial-coating-on-surgical-sutures
#11
Jochen Reinbold, Ann-Kristin Uhde, Ingrid Müller, Tobias Weindl, Jürgen Geis-Gerstorfer, Christian Schlensak, Hans-Peter Wendel, Stefanie Krajewski
Surgical site infections (SSIs) are one of the most common nosocomial infections, which can result in serious complications after surgical interventions. Foreign materials such as implants or surgical sutures are optimal surfaces for the adherence of bacteria and subsequent colonization and biofilm formation. Due to a significant increase in antibiotic-resistant bacterial strains, naturally occurring agents exhibiting antibacterial properties have great potential in prophylactic therapies. The aim of this study was to develop a coating for surgical sutures consisting of the antibacterial substance totarol, a naturally occurring diterpenoid isolated from Podocarpustotara in combination with poly(lactide-co-glycolide acid) (PLGA) as a biodegradable drug delivery system...
September 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28925946/development-and-biocompatibility-evaluation-of-photocatalytic-tio%C3%A2-reduced-graphene-oxide-based-nanoparticles-designed-for-self-cleaning-purposes
#12
Ionela Cristina Nica, Miruna S Stan, Marcela Popa, Mariana Carmen Chifiriuc, Gratiela G Pircalabioru, Veronica Lazar, Iuliana Dumitrescu, Lucian Diamandescu, Marcel Feder, Mihaela Baibarac, Marin Cernea, Valentin Adrian Maraloiu, Traian Popescu, Anca Dinischiotu
Graphene is widely used in nanotechnologies to amplify the photocatalytic activity of TiO₂, but the development of TiO₂/graphene composites imposes the assessment of their risk to human and environmental health. Therefore, reduced graphene oxide was decorated with two types of TiO₂ particles co-doped with 1% iron and nitrogen, one of them being obtained by a simultaneous precipitation of Ti(3+) and Fe(3+) ions to achieve their uniform distribution, and the other one after a sequential precipitation of these two cations for a higher concentration of iron on the surface...
September 19, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28925553/dispersal-and-inhibitory-roles-of-mannose-2-deoxy-d-glucose-and-n-acetylgalactosaminidase-on-the-biofilm-of-desulfovibrio-vulgaris
#13
Venkata G Poosarla, Thammajun L Wood, Lei Zhu, Daniel S Miller, Bei Yin, Thomas K Wood
Biofilms of sulfate-reducing bacteria (SRB) are often the major cause of microbiologically influenced corrosion. The representative SRB Desulfovibrio vulgaris has previously been shown to have a biofilm that consists primarily of protein. In this study, by utilizing lectin staining, we identified that the biofilm of D. vulgaris also consists of the matrix components mannose, fucose, and N-acetylgalactosamine (GalNAc), with mannose predominating. Based on these results, we found that the addition of mannose and the non-metabolizable mannose analog 2-deoxy-D-glucose inhibits the biofilm formation of D...
September 19, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28924033/rgpf-is-required-for-maintenance-of-stress-tolerance-and-virulence-in-streptococcus-mutans
#14
C J Kovacs, R C Faustoferri, R G Quivey
Bacterial cell wall dynamics have been implicated as important determinants of cellular physiology, stress tolerance and virulence. In Streptococcus mutans, the cell wall is composed primarily of a rhamnose-glucose polysaccharide (RGP) linked to the peptidoglycan. Despite extensive studies describing its formation and composition, the potential roles for RGP in S. mutans biology have not been well investigated. The present study characterizes the impact of RGP disruption as a result of deletion of rgpF, the gene encoding a rhamnosyltransferase involved in construction of the core poly-rhamnose backbone of RGP...
September 18, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28924029/circuitry-linking-the-global-csr-and-%C3%AF-e-dependent-cell-envelope-stress-response-systems
#15
Helen Yakhnin, Robert Aichele, Sarah E Ades, Tony Romeo, Paul Babitzke
CsrA of Escherichia coli is an RNA-binding protein that globally regulates a wide variety of cellular processes and behaviors including carbon metabolism, motility, biofilm formation, and the stringent response. CsrB and CsrC are sRNAs that sequester CsrA, thereby preventing CsrA-mRNA interaction. RpoE (σ(E)) is the extracytoplasmic stress response sigma factor of E. coli Previous RNA-seq studies identified rpoE mRNA as a CsrA target. Here we explored the regulation of rpoE by CsrA and found that CsrA represses rpoE translation...
September 18, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28923875/pharmacological-inhibition-of-the-pseudomonas-aeruginosa-mvfr-quorum-sensing-system-interferes-with-biofilm-formation-and-potentiates-antibiotic-mediated-biofilm-disruption
#16
Damien Maura, Laurence G Rahme
Pseudomonas aeruginosa biofilms contribute to its survival on biotic and abiotic surfaces and represent a major clinical threat due to their high tolerance to antibiotics. Therefore, the discovery of anti-biofilm agents may hold great promise. We show that pharmacological inhibition of the P. aeruginosa quorum sensing regulator MvfR (PqsR) using a benzamide-benzimidazole compound interferes with biofilm formation and potentiates biofilm sensitivity to antibiotics. Such a strategy could have a great potential against P...
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28923873/an-anti-persister-strategy-for-the-treatment-of-chronic-pseudomonas-aeruginosa-infections
#17
Martina Koeva, Alina D Gutu, Wesley Hebert, Jeffrey D Wager, Lael M Yonker, George A O'Toole, Frederick M Ausubel, Samuel M Moskowitz, Diane Joseph-McCarthy
Bacterial persisters are a quasi-dormant sub-population of cells that are tolerant to antibiotic treatment. The combination of the aminoglycoside tobramycin with fumarate as an antibacterial potentiator utilizes an anti-persister strategy that is aimed at reducing recurrent Pseudomonas aeruginosa infections by enhancing the killing of P. aeruginosa persisters. Stationary phase cultures of P. aeruginosa were used to generate persister cells. A range of tobramycin concentrations was tested with a range of metabolite concentrations to determine the potentiation effect of the metabolite under a variety of conditions, including a range of pH values and in the presence of azithromycin or cystic fibrosis (CF) patient sputum...
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28923863/synergistic-effects-of-tacrolimus-and-azoles-against-exophiala-dermatitidis
#18
Lujuan Gao, Yi Sun, Chengyan He, Tongxiang Zeng, Ming Li
In vitro interactions of tacrolimus, a calcineurin inhibitor, and azoles including itraconazole, voriconazole, and posaconazole against planktonic cells and biofilms of Exophiala dermatitidis were assessed via broth microdilution checkerboard technique. A total of 16 clinical isolates were studied. The results revealed favorable synergistic inhibitory activity between tacrolimus and itraconazole, voriconazole, or posaconazole against planktonic cells of E. dermatitidis However, limited synergism was observed against biofilms of E...
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28923132/characterization-of-environmental-pseudomonas-aeruginosa-using-multilocus-sequence-typing-scheme
#19
Júlia Radó, Edit Kaszab, Tünde Petrovics, Judit Pászti, Balázs Kriszt, Sándor Szoboszlay
PURPOSE: The objectives of this study were to examine environmental (hydrocarbon degrading) Pseudomonas aeruginosa isolates with Multilocus Sequence Typing (MLST) and to determine their relevant features, such as serotype, virulence genes, biofilm forming ability and hydrocarbon degrading capacity. METHODOLOGY: The diversity of environmental isolates was assessed with an MLST scheme. Investigation of virulence determinants included serotyping, hemolytic activity test and the detection of virulence genes exoS, exoY, exoT, exoU, exoA...
September 19, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28922840/quantification-of-agrobacterium-tumefaciens-c58-attachment-to-arabidopsis-thaliana-roots
#20
Anna Petrovicheva, Jessica Joyner, Theodore R Muth
Agrobacterium tumefaciens is the causal agent of crown gall disease and is a vector for DNA transfer in transgenic plants. The transformation process by A. tumefaciens has been widely studied, but the attachment stage has not been well characterized. Most measurements of attachment have used microscopy and colony counting, both of which are labor and time intensive. To reduce the time and effort required to analyze bacteria attaching to plant tissues, we developed a quantitative real-time PCR (qPCR) assay to quantify attached A...
October 2, 2017: FEMS Microbiology Letters
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