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https://www.readbyqxmd.com/read/28634714/microbial-community-shift-in-a-suspended-stuffing-biological-reactor-with-pre-attached-aerobic-denitrifier
#1
Cong Du, Chongwei Cui, Shan Qiu, Shanwen Xu, Shengnan Shi, Thangavel Sangeetha, Fang Ma
Bioaugmentation is substantially determined by pre-attached communities in biological stuffing systems. However, the inevitable changes of microbial community shift occurred between pre-attached microorganisms on stuffing material and other existing communities in wastewater. Targeting at nitrogen removal in aerobic denitrification reactors, biological augmentation was built by polyurethane supporting material and aerobic denitrification bacteria of Pseudomonas stutzeri strains were primarily colonized. The total nitrogen removal reached a high efficiency of 77 ± 6%, resulting from a relative high nitrate removal (90%) and a low nitrite production of 24 mg l(-1)...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28634301/microbial-glycoside-hydrolases-as-antibiofilm-agents-with-cross-kingdom-activity
#2
Brendan D Snarr, Perrin Baker, Natalie C Bamford, Yukiko Sato, Hong Liu, Mélanie Lehoux, Fabrice N Gravelat, Hanna Ostapska, Shane R Baistrocchi, Robert P Cerone, Elan E Filler, Matthew R Parsek, Scott G Filler, P Lynne Howell, Donald C Sheppard
Galactosaminogalactan and Pel are cationic heteropolysaccharides produced by the opportunistic pathogens Aspergillus fumigatus and Pseudomonas aeruginosa, respectively. These exopolysaccharides both contain 1,4-linked N-acetyl-d-galactosamine and play an important role in biofilm formation by these organisms. Proteins containing glycoside hydrolase domains have recently been identified within the biosynthetic pathway of each exopolysaccharide. Recombinant hydrolase domains from these proteins (Sph3h from A...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28634241/psl-produced-by-mucoid-pseudomonas-aeruginosa-contributes-to-the-establishment-of-biofilms-and-immune-evasion
#3
Christopher J Jones, Daniel J Wozniak
Despite years of research and clinical advances, chronic pulmonary infections with mucoid Pseudomonas aeruginosa remain the primary concern for cystic fibrosis patients. Much of the research on these strains has focused on the contributions of the polysaccharide alginate; however, it is becoming evident that the neutral polysaccharide Psl also contributes to biofilm formation and the maintenance of chronic infections. Here, we demonstrate that Psl produced by mucoid strains has significant roles in biofilm structure and evasion of immune effectors...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28634237/the-pseudomonas-aeruginosa-psl-polysaccharide-is-a-social-but-noncheatable-trait-in-biofilms
#4
Yasuhiko Irie, Aled E L Roberts, Kasper N Kragh, Vernita D Gordon, Jaime Hutchison, Rosalind J Allen, Gavin Melaugh, Thomas Bjarnsholt, Stuart A West, Stephen P Diggle
Extracellular polysaccharides are compounds secreted by microorganisms into the surrounding environment, and they are important for surface attachment and maintaining structural integrity within biofilms. The social nature of many extracellular polysaccharides remains unclear, and it has been suggested that they could function as either cooperative public goods or as traits that provide a competitive advantage. Here, we empirically tested the cooperative nature of the PSL polysaccharide, which is crucial for the formation of biofilms in Pseudomonas aeruginosa We show that (i) PSL is not metabolically costly to produce; (ii) PSL provides population-level benefits in biofilms, for both growth and antibiotic tolerance; (iii) the benefits of PSL production are social and are shared with other cells; (iv) the benefits of PSL production appear to be preferentially directed toward cells which produce PSL; (v) cells which do not produce PSL are unable to successfully exploit cells which produce PSL...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28633523/the-effect-of-pseudomonas-fluorescens-on-buried-steel-pipeline-corrosion
#5
Amy J Spark, Ivan S Cole, Adam S Best, David W Law, Liam P Ward
Buried steel infrastructure can be a source of iron ions for bacterial species, leading to microbiologically influence corrosion (MIC). Localised corrosion of pipelines due to MIC is one of the key failure mechanisms of buried steel pipelines. In order to better understand the mechanisms of localised corrosion in soil, semi-solid agar has been developed as an analogue for soil. Here, Pseudomonas fluorescens has been introduced to the system to understand how bacteria interact with steel. Through electrochemical testing including open circuit potentials, potentiodynamic scans, anodic potential holds and electrochemical impedance spectroscopy it has been shown that P...
June 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28632988/solid-sampling-with-a-diode-laser-for-portable-ambient-mass-spectrometry
#6
Yeni P Yung, Raveendra Wickramasinghe, Anu Vaikkinen, Tiina Johanna Kauppila, Igor V Veryovkin, Luke Hanley
A handheld diode laser is implemented for solid sampling in portable ambient mass spectrometry (MS). Specifically, a pseudo-continuous wave battery-powered surgical laser diode is employed for portable laser diode thermal desorption (LDTD) at 940 nm and compared with nanosecond pulsed laser ablation at 2940 nm. Postionization is achieved in both cases using atmospheric pressure photoionization (APPI). The laser ablation atmospheric pressure photoionization (LAAPPI) and LDTD-APPI mass spectra of sage leaves (Salvia officinalis) using a field-deployable quadrupole ion trap MS display many similar ion peaks, as do the mass spectra of membrane grown biofilms of Pseudomonas aeruginosa...
June 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28630204/a-low-molecular-weight-alginate-oligosaccharide-disrupts-pseudomonal-microcolony-formation-and-enhances-antibiotic-effectiveness
#7
Manon F Pritchard, Lydia C Powell, Alison A Jack, Kate Powell, Konrad Beck, Hannah Florance, Julian Forton, Philip D Rye, Arne Dessen, Katja E Hill, David W Thomas
In chronic respiratory disease the formation of dense, 3-dimensional 'micro colonies' by Pseudomonas aeruginosa within the airway plays an important role in contributing to resistance to treatment. An in vitro biofilm model of pseudomonal microcolony formation using artificial sputum (AS) medium was established to study the effects of low molecular weight alginate oligomers (OligoG CF-5/20) on pseudomonal growth, microcolony formation and the efficacy of colistin. The studies employed clinical cystic fibrosis (CF) isolates (n=3) and reference non-mucoid and mucoid multi-drug resistant (MDR) CF isolates (n=7)...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28628310/furoxan-nitric-oxide-donors-disperse-pseudomonas-aeruginosa-biofilms-accelerate-growth-and-repress-pyoverdine-production
#8
Wee Han Poh, Nicolas Barraud, Stefano Guglielmo, Loretta Lazzarato, Barbara Rolando, Roberta Fruttero, Scott A Rice
The use of nitric oxide (NO) as a signal for biofilm dispersal has been shown to increase the susceptibility of many biofilms to antibiotics, promoting their eradication. The delivery of NO to biofilms can be achieved by using NO-donors with different kinetics and properties of NO release that can influence their efficacy as biofilm control agents. In this study, the kinetics of three furoxan-derivatives were evaluated. The effects of these NO-donors, which have an advantageous pharmacological profile of slower onset with an extended duration of action, on Pseudomonas aeruginosa growth, biofilm development and dispersal were also characterized...
June 19, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28627772/bactericidal-effect-of-calcium-oxide-scallop-shell-powder-against-pseudomonas-aeruginosa-biofilm-on-quail-egg-shell-stainless-steel-plastic-and-rubber
#9
Soo-Jin Jung, Shin Young Park, Seh Eun Kim, Ike Kang, Jiyong Park, Jungwon Lee, Chang-Min Kim, Myung-Sub Chung, Sang-Do Ha
The aim of this study was to evaluate the bactericidal effect of calcium oxide (CaO) against Pseudomonas aeruginosa biofilms on quail eggshells and major egg contacting surfaces (stainless steel, plastic, and rubber). The samples were subjected to CaO treatments (0%, 0.01%, 0.05%, 0.10%, 0.15%, 0.20%, 0.25%, and 0.30%) for 1 min. All the CaO treatments significantly reduced P. aeruginosa biofilms on all tested surfaces as compared to controls. In comparison of biofilm stability, the strongest and most resistant biofilm was formed on eggshell against the CaO treatment, followed by rubber, stainless steel, and plastic...
June 19, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28622385/effect-of-acute-predation-with-bacteriophage-on-intermicrobial-aggression-by-pseudomonas-aeruginosa
#10
Patrick R Secor, Gabriele Sass, Hasan Nazik, David A Stevens
In persons with structural lung disease, particularly those with cystic fibrosis (CF), chronic airway infections cause progressive loss of lung function. CF airways can be colonized by a variety of microorganisms; the most frequently encountered bacterial and fungal pathogens are Pseudomonas aeruginosa and Aspergillus fumigatus, respectively. Co-infection with P. aeruginosa and A. fumigatus often results in a more rapid loss of lung function, indicating that interactions between these pathogens affect infection pathogenesis...
2017: PloS One
https://www.readbyqxmd.com/read/28621641/colistin-resistance-in-pseudomonas-aeruginosa-that-is-not-linked-to-arnb
#11
Eun Seon Chung, Ji-Young Lee, Ji-Young Rhee, Kwan Soo Ko
PURPOSE: It is known that the arnB (or pmrH) gene encoding uridine 5'-(beta-1-threo-pentapyranosyl-4-ulose diphosphate) aminotransferase plays a critical role in colistin resistance in Pseudomonas aeruginosa through the addition of 4-amino-4-deoxy-l-arabinose (l-Ara4N) to lipid A. In this study, we attempted to obtain a colistin-resistant mutant from an arnB-deleted mutant through exposure to colistin. METHODOLOGY: We constructed an arnB deletion mutant (P5ΔarnB :: nptIII) from a colistin-susceptible strain (P5) by allelic replacement mutagenesis, and colistin-resistant mutants were selected in vitro using P5 and P5ΔarnB :: nptIII...
June 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28613253/terpenoids-from-platostoma-rotundifolium-briq-a-j-paton-alter-the-expression-of-quorum-sensing-related-virulence-factors-and-the-formation-of-biofilm-in-pseudomonas-aeruginosa-pao1
#12
Tsiry Rasamiravaka, Jérémie Ngezahayo, Laurent Pottier, Sofia Oliveira Ribeiro, Florence Souard, Léonard Hari, Caroline Stévigny, Mondher El Jaziri, Pierre Duez
Platostoma rotundifolium (Briq.) A. J. Paton aerial parts are widely used in Burundi traditional medicine to treat infectious diseases. In order to investigate their probable antibacterial activities, crude extracts from P. rotundifolium were assessed for their bactericidal and anti-virulence properties against an opportunistic bacterial model, Pseudomonas aeruginosa PAO1. Whereas none of the tested extracts exert bacteriostatic and/or bactericidal proprieties, the ethyl acetate and dichloromethane extracts exhibit anti-virulence properties against Pseudomonas aeruginosa PAO1 characterized by an alteration in quorum sensing gene expression and biofilm formation without affecting bacterial viability...
June 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28611763/lauroyl-arginate-ethyl-blocks-the-iron-signals-necessary-for-pseudomonas-aeruginosa-biofilm-development
#13
Taek-Seung Kim, So-Young Ham, Bernie B Park, Youngjoo Byun, Hee-Deung Park
Pseudomonas aeruginosa is a ubiquitous gram-negative bacterium capable of forming a biofilm on living and non-living surfaces, which frequently leads to undesirable consequences. We found that lauroyl arginate ethyl (LAE), a synthetic non-oxidizing biocide, inhibited biofilm formation by P. aeruginosa at a sub-growth inhibitory concentration under both static and flow conditions. A global transcriptome analysis was conducted using a gene chip microarray to identify the genes targeted by LAE. In response to LAE treatment, P...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28611496/a-bacteriophage-mediated-gold-nanoparticles-synthesis-and-their-anti-biofilm-activity
#14
S S Ahiwale, A V Bankar, S Tagunde, B P Kapadnis
In the present study, gold nanoparticles (AuNPs) synthesis was carried out by using a rare bacteriophage which is morphologically similar to 7-11 phages of the C3 morphotype of tailed phage belonging to Podoviridae family as green route. Effect of various physiological parameters like pH, temperature and concentration of gold chloride salt on AuNPs synthesis was studied. The reaction mixtures have shown vivid colours at various physiological parameters. Phage inspired AuNPs were further characterized by using different techniques such as UV-Vis spectrophotometry, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and dynamic light scattering (DLS)...
June 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28611429/streptococcus-sp-in-neonatal-endotracheal-tube-biofilms-is-associated-with-ventilator-associated-pneumonia-and-enhanced-biofilm-formation-of-pseudomonas-aeruginosa-pao1
#15
Yun Pan, Sijie Song, Xiaoli Tang, Qing Ai, Danping Zhu, Zhenqiu Liu, Jialin Yu
Ventilator-associated pneumonia (VAP) is a serious complication of mechanical ventilation leading to high morbidity and mortality among intubated neonates in neonatal intensive care units (NICUs). Endotracheal tube (ETT) biofilm flora were considered to be responsible for the occurrence of VAP as a reservoir of pathogens. However, regarding neonates with VAP, little is known about the complex microbial signatures in ETT biofilms. In the present study, a culture-independent approach based on next generation sequencing was performed as an initial survey to investigate the microbial communities in ETT biofilms of 49 intubated neonates with and without VAP...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28609638/hyperbiofilm-phenotype-of-pseudomonas-aeruginosa-defective-for-the-plcb-and-plcn-secreted-phospholipases
#16
Shawn Lewenza, Laetitia Mazenod, Shirin Afroj, Erik van Tilburg Bernardes
Biofilms are dense communities of bacteria enmeshed in a protective extracellular matrix composed mainly of exopolysaccharides (EPS), extracellular DNA (eDNA), proteins and outer membrane vesicles (OMV). Given the role of biofilms in antibiotic tolerant and chronic infections, novel strategies are needed to block, disperse or degrade biofilms. Enzymes that degrade the biofilm matrix are a promising new therapy. We screened mutants in many of the enzymes secreted by the type II secretion system (T2SS) and determined that the T2SS, and specifically phospholipases, play a role in biofilm formation...
June 13, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28607054/electron-shuttling-antibiotics-structure-bacterial-communities-by-modulating-cellular-levels-of-c-di-gmp
#17
Chinweike Okegbe, Blanche L Fields, Stephanie J Cole, Christopher Beierschmitt, Chase J Morgan, Alexa Price-Whelan, Richard C Stewart, Vincent T Lee, Lars E P Dietrich
Diverse organisms secrete redox-active antibiotics, which can be used as extracellular electron shuttles by resistant microbes. Shuttle-mediated metabolism can support survival when substrates are available not locally but rather at a distance. Such conditions arise in multicellular communities, where the formation of chemical gradients leads to resource limitation for cells at depth. In the pathogenic bacterium Pseudomonas aeruginosa PA14, antibiotics called phenazines act as oxidants to balance the intracellular redox state of cells in anoxic biofilm subzones...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28606056/comparative-genome-and-transcriptome-analysis-reveals-distinctive-surface-characteristics-and-unique-physiological-potentials-of-pseudomonas-aeruginosa-atcc-27853
#18
Huiluo Cao, Yong Lai, Salim Bougouffa, Zeling Xu, Aixin Yan
BACKGROUND: Pseudomonas aeruginosa ATCC 27853 was isolated from a hospital blood specimen in 1971 and has been widely used as a model strain to survey antibiotics susceptibilities, biofilm development, and metabolic activities of Pseudomonas spp.. Although four draft genomes of P. aeruginosa ATCC 27853 have been sequenced, the complete genome of this strain is still lacking, hindering a comprehensive understanding of its physiology and functional genome. RESULTS: Here we sequenced and assembled the complete genome of P...
June 12, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28605563/the-contribution-of-pseudomonas-aeruginosa-virulence-factors-and-host-factors-in-the-establishment-of-urinary-tract-infections
#19
J W Newman, R V Floyd, J L Fothergill
Pseudomonas aeruginosa can cause complicated urinary tract infections, particularly in people with catheters, which can lead to pyelonephritis. Whilst some subgroups appear more susceptible to infection, such as the elderly and women, the contribution of other host factors and bacterial virulence factors to successful infection remains relatively understudied. In this review, we explore the potential role of P. aeruginosa virulence factors including phenazines, quorum sensing, biofilm formation, and siderophores along with host factors such as Tamm-Horsfall protein, osmotic stress and iron specifically on establishment of successful infection in the urinary niche...
June 12, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28605431/matrix-exopolysaccharides-the-sticky-side-of-biofilm-formation
#20
Eve Maunders, Martin Welch
The Gram-negative pathogen Pseudomonas aeruginosa is found ubiquitously within the environment and is recognised as an opportunistic human pathogen that commonly infects burn wounds and immunocompromised individuals, or patients suffering from the autosomal recessive disorder cystic fibrosis (CF). During chronic infection, P. aeruginosa is thought to form structured aggregates known as biofilms characterised by a self-produced matrix which encases the bacteria, protecting them from anti-microbial attack and the host immune response...
June 12, 2017: FEMS Microbiology Letters
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