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https://www.readbyqxmd.com/read/28215046/genome-resolved-metagenomics-of-a-bioremediation-system-for-degradation-of-thiocyanate-in-mine-water-containing-suspended-solid-tailings
#1
Sumayah F Rahman, Rose S Kantor, Robert Huddy, Brian C Thomas, Andries W van Zyl, Susan T L Harrison, Jillian F Banfield
Thiocyanate (SCN(-) ) is a toxic compound that forms when cyanide (CN(-) ), used to recover gold, reacts with sulfur species. SCN(-) -degrading microbial communities have been studied, using bioreactors fed synthetic wastewater. The inclusion of suspended solids in the form of mineral tailings, during the development of the acclimatized microbial consortium, led to the selection of an active planktonic microbial community. Preliminary analysis of the community composition revealed reduced microbial diversity relative to the laboratory-based reactors operated without suspended solids...
February 19, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28214735/rna-based-control-mechanisms-of-clostridium-difficile
#2
REVIEW
Olga Soutourina
Clostridium difficile (CD)-associated diarrhoea is currently the most prevalent nosocomial diarrhoea worldwide. Many characteristics of CD pathogenicity remain poorly understood. Recent data strongly indicate the importance of an RNA network for the control of gene expression in CD. More than 200 regulatory RNAs have been identified by deep sequencing and targeted approaches, including Hfq-dependent trans riboregulators, cis-antisense RNAs, CRISPR RNAs, and c-di-GMP-responsive riboswitches. These regulatory RNAs are involved in the control of major processes in the CD infection cycle, for example motility, biofilm formation, adhesion, sporulation, stress response, and defence against bacteriophages...
February 16, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/28214733/flexible-camphor-diamond-like-carbon-coating-on-polyurethane-to-prevent-candida-albicans-biofilm-growth
#3
Thaisa B Santos, Angela A Vieira, Luciana O Paula, Everton D Santos, Polyana A Radi, Sônia Khouri, Homero S Maciel, Rodrigo S Pessoa, Lucia Vieira
Camphor was incorporated in diamond-like carbon (DLC) films to prevent the Candida albicans yeasts fouling on polyurethane substrates, which is a material commonly used for catheter manufacturing. The camphor:DLC and DLC film for this investigation was produced by plasma enhanced chemical vapor deposition (PECVD), using an apparatus based on the flash evaporation of organic liquid (hexane) containing diluted camphor for camphor:DLC and hexane/methane, mixture for DLC films. The film was deposited at a low temperature of less than 25°C...
February 16, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28214364/in-situ-analysis-of-bacillus-licheniformis-biofilms-amyloid-like-polymers-and-edna-are-involved-in-the-adherence-and-aggregation-of-the-extracellular-matrix
#4
I Randrianjatovo-Gbalou, P Rouquette, D Lefebvre, E Girbal-Neuhauser, C-E Marcato-Romain
AIMS: This study attempts to determine which exopolymeric substances are involved in the adherence and aggregation of a Bacillus licheniformis biofilm. METHODS AND RESULTS: The involvement of extracellular proteins and eDNA were particularly investigated using DNase and proteinase K treatment. The permeability of the biofilms increased 5-fold after DNase I-treatment. Quantification of the matrix components showed that, whatever the enzyme tested, some eDNA and amyloid-like polymers were removed simultaneously...
February 18, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28214190/biofilm-formation-by-staphylococcus-aureus-isolates-from-a-dental-clinic-in-konya-turkey
#5
Emrah Torlak, Emre Korkut, Ali T Uncu, Yağmur Şener
The ability of Staphylococcus aureus to form biofilm is considered to be a major virulence factor influencing its survival and persistence in both the environment and the host. Biofilm formation in S. aureus is most frequently associated with production of polysaccharide intercellular adhesion by ica operon-encoded enzymes. The present work aimed at evaluating the in vitro biofilm production and presence of the icaA and icaD genes in S. aureus isolates from a dental clinic in Konya, Turkey. The surfaces of inanimate objects were sampled over a period of six months...
February 14, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28213809/the-correlation-between-biofilm-production-and-catheter-related-blood-stream-infections-sustained-by-candida-a-case-control-study
#6
Grazia Brunetti, Valeria Visconti, Maria Cristina Ghezzi, Alessandra Giordano, Giammarco Raponi
Biofilm forming capacity of yeasts colonizing the intravenous devices is considered a key factor involved in the pathogenesis of Candida catheter-related bloodstream infections (CCRBSI). The biofilm production of strains of Candida spp. isolated both from the CVC and from the blood of patients with CCRBSI was compared to that of strains isolated from patients not having CCRBSI. Results, expressed in terms of Biofilm Index (BI), revealed that biofilm-producing strains were isolated in the CCRBSI group with a frequency significantly higher than in the non-CCRBSI group (χ(2) = 4...
February 18, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28213732/the-potential-of-lactic-acid-bacteria-to-colonize-biotic-and-abiotic-surfaces-and-the-investigation-of-their-interactions-and-mechanisms
#7
REVIEW
Mattia Pia Arena, Vittorio Capozzi, Giuseppe Spano, Daniela Fiocco
Lactic acid bacteria (LAB) are a heterogeneous group of Gram-positive bacteria that comprise several species which have evolved in close association with humans (food and lifestyle). While their use to ferment food dates back to very ancient times, in the last decades, LAB have attracted much attention for their documented beneficial properties and for potential biomedical applications. Some LAB are commensal that colonize, stably or transiently, host mucosal surfaces, inlcuding the gut, where they may contribute to host health...
February 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28213708/removal-mechanisms-for-extremely-high-level-fluoroquinolone-antibiotics-in-pharmaceutical-wastewater-treatment-plants
#8
Xinyan Guo, Zheng Yan, Yi Zhang, Xiangji Kong, Deyang Kong, Zhengjun Shan, Na Wang
Pharmaceutical wastewater treatment plants (PWWTPs) receive industrial effluents from the plant that contain extremely high levels of antibiotics and are regarded as one of the major sources of antibiotics in the environment. Two PWWTPs have been selected in Zhejiang Province, China, to assess the removal mechanisms of fluoroquinolone antibiotics (FQs). PWWTP A uses activated sludge with biocarriers in a moving bed biofilm reactor in anoxic and aerobic units, and PWWTP B uses biological units under anaerobic, aerobic, and anoxic conditions...
February 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28213335/transformation-products-of-clindamycin-in-moving-bed-biofilm-reactor-mbbr
#9
Gordon T H Ooi, Monica Escola Casas, Henrik R Andersen, Kai Bester
Clindamycin is widely prescribed for its ability to treat a number of common bacterial infections. Thus, clindamycin enters wastewater via human excretion or disposal of unused medication and widespread detection of pharmaceuticals in rivers proves the insufficiency of conventional wastewater treatment plants in removing clindamycin. Recently, it has been discovered that attached biofilm reactors, e.g., moving bed biofilm reactors (MBBRs) obtain a higher removal of pharmaceuticals than conventional sludge wastewater treatment plants...
February 2, 2017: Water Research
https://www.readbyqxmd.com/read/28213334/reactive-oxygen-a-novel-antimicrobial-mechanism-for-targeting-biofilm-associated-infection
#10
REVIEW
Matthew S Dryden, Jonathan Cooke, Rami J Salib, Rebecca E Holding, Timothy Biggs, Ali A Salamat, Raymond N Allan, Rachel S Newby, Fenella Halstead, Beryl Oppenheim, Thomas Hall, Sophie C Cox, Liam M Grover, Zain Al-Hindi, Lilyann Novak-Frazer, Malcolm D Richardson
Reactive oxygen species (ROS) is a novel therapeutic strategy for topical or local application to wounds, mucosa or internal structures where there may be heavy bacterial bioburden with biofilm and chronic inflammation. Bacterial biofilms are a significant problem in clinical settings owing to their increased tolerance towards conventionally prescribed antibiotics and their propensity for selection of further antibacterial resistance. There is therefore a pressing need for the development of alternative therapeutic strategies that can improve antibiotic efficacy towards biofilms...
February 14, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28213285/mechanical-and-chemical-studies-on-eps-from-sulfobacillus-thermosulfidooxidans-from-planktonic-to-biofilm-cells
#11
Qian Li, Wolfgang Sand
Bacteria attach to minerals and form biofilms, which can initiate and enhance bioleaching. Extracellular polymeric substances (EPS) play a crucial role during the whole process. Little is known how the cell surface/EPS mechanically and chemically respond to transformation from planktonic to biofilm cells. In this study the attachment and biofilm formation by Sulfobacillus thermosulfidooxidans were followed during pyrite leaching. Adhesiveness and stiffness of the cell/biofilm and the pyrite surface were checked by atomic force microscopy (AFM) in force mapping mode under real living conditions...
February 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28213018/pathogen-biofilm-formation-on-cantaloupe-surface-and-its-impact-on-the-antibacterial-effect-of-lauroyl-arginate-ethyl
#12
Yezhi Fu, Amanda J Deering, Arun K Bhunia, Yuan Yao
Pathogen biofilm at fruit surface may pose a particular risk to food safety. In this study, the biofilms of Listeria monocytogenes V7 and Salmonella enterica serovar Typhimurium ATCC 13311 on cantaloupe fruit surface were visualized, and the resistance of biofilms against lauroyl arginate ethyl (LAE, an antibacterial compound) was evaluated. Each bacterium was inoculated on isolated cantaloupe rind surfaces at 10(5)-10(6) CFU/cm(2) and after incubation for 2, 12, 24, and 48 h, the surfaces were imaged using cryo-scanning electron microscopy (Cryo-SEM)...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28212980/biofilm-formation-and-release-of-fluoride-from-dental-restorative-materials-in-relation-to-their-surface-properties
#13
Sebastian Hahnel, Andrei C Ionescu, Gloria Cazzaniga, Marco Ottobelli, Eugenio Brambilla
OBJECTIVES: To elucidate the impact of surface properties and the release of fluoride from different glass ionomer cements on biofilm formation. METHODS: Standardized specimens manufactured from various classes of glass ionomer cements (GICs), a resin-based composite (RBC), and human enamel were subjected to surface analyses. Subsequent to simulation of salivary pellicle formation, Streptococcus mutans biofilm formation was initiated using a drip flow reactor for 48h and 96h...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28212615/molecular-pathways-underlying-inhibitory-effect-of-antimicrobial-peptide-nal-p-113-on-bacteria-biofilms-formation-of-porphyromonas-gingivalis-w83-by-dna-microarray
#14
Hong-Yan Wang, Li Lin, Li-Si Tan, Hui-Yuan Yu, Jya-Wei Cheng, Ya-Ping Pan
BACKGROUND: Wound-related infection remains a major challenge for health professionals. One disadvantage in conventional antibiotics is their inability to penetrate biofilms, the main protective strategy for bacteria to evade irradiation. Previously, we have shown that synthetic antimicrobial peptides could inhibit bacterial biofilms formation. RESULTS: In this study, we first delineated how Nal-P-113, a novel antimicrobial peptide, exerted its inhibitory effects on Porphyromonas gingivalis W83 biofilms formation at a low concentration...
February 17, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28212517/phytoremediation-of-dyes-using-lagerstroemia-speciosa-mediated-silver-nanoparticles-and-its-biofilm-activity-against-clinical-strains-pseudomonas-aeruginosa
#15
V Sai Saraswathi, Neethu Kamarudheen, K V BhaskaraRao, K Santhakumar
The aim of this study was to prepare silver nanoparticles by a green method using the aqueous leaves extract of Lagerstroemia speciosa. The prepared silver nanoparticles were characterized, studied for its photocatalytic and biofilm inhibition studies. The maximum absorbance peak was found at 427nm and thus confirming the formation of silver nanoparticles. The average size of silver nanoparticles synthesized was found to be 12nm using XRD and it was spherical in shape. The nanoparticles synthesized was investigated for photocatalytic activity for to two different dye molecules, methyl orange and methylene blue showing 310 and 290min degradation time respectively...
February 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28212310/presence-of-calcium-lowers-the-expansion-of-bacillus-subtilis-colony-biofilms
#16
Eisha Mhatre, Anandaroopan Sundaram, Theresa Hölscher, Mike Mühlstädt, Jörg Bossert, Ákos T Kovács
Robust colony formation by Bacillus subtilis is recognized as one of the sessile, multicellular lifestyles of this bacterium. Numerous pathways and genes are responsible for the architecturally complex colony structure development. Cells in the biofilm colony secrete extracellular polysaccharides (EPS) and protein components (TasA and the hydrophobin BslA) that hold them together and provide a protective hydrophobic shield. Cells also secrete surfactin with antimicrobial as well as surface tension reducing properties that aid cells to colonize the solid surface...
February 16, 2017: Microorganisms
https://www.readbyqxmd.com/read/28212280/biofilm-formation-and-immunomodulatory-activity-of-proteus-mirabilis-clinically-isolated-strains
#17
Alessandra Fusco, Lorena Coretti, Vittoria Savio, Elisabetta Buommino, Francesca Lembo, Giovanna Donnarumma
Urinary tract infections (UTIs) and catheter-associated UTIs (CAUTIs) are the principal hospital-acquired infections. Proteus mirabilis is characterized by several virulence factors able to promote adhesion and biofilm formation and ameliorate the colonization of urinary tract and the formation of crystalline biofilms on the abiotic surface of the urinary catheters. Since, to date, the role of P. mirabilis in the etiopathogenesis of different types of urinary tract infections is not well established, in this study we sought to characterize two different clinically isolated strains of P...
February 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28212143/staphylococcus-aureus-infections-some-second-thoughts
#18
Willem J B van Wamel
PURPOSE OF REVIEW: Staphylococcus aureus (S. aureus) is well known for its ability to cause life-threatening infections. On the other hand, this bacterium can thrive as a commensal on and in human tissues without causing much problems. How big a threat is S. aureus actually? Furthermore, commensalism is associated with biofilms, where can we find them, and which natural and artificial components activate biofilm formation? RECENT FINDINGS: Recent findings on S. aureus carriage on skin, mucosa, and in wounds indicate the presence of large numbers of S...
February 15, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28211996/alternating-current-electrophoretic-deposition-for-the-immobilization-of-antimicrobial-agents-on-titanium-implant-surfaces
#19
Annabel Braem, Katrijn De Brucker, Nicolas Delattin, Manuela Sonja Killian, Maarten B J Roeffaers, Tomohiko Yoshioka, Satoshi Hayakawa, Patrik Schmuki, Bruno P A Cammue, Sannakaisa Virtanen, Karin Thevissen, Bram Neirinck
One prominent cause of implant failure is infection, therefore research is focusing on developing surface coatings that render the surface resistant to colonization by micro-organisms. Permanently attached coatings of antimicrobial molecules are of particular interest because of the reduced cytoxicity and lower risk of developing resistance compared to controlled release coatings. In this study, we focus on the chemical grafting of bioactive molecules on titanium. To concentrate the molecules at the metallic implant surface, we propose electrophoretic deposition (EPD) applying alternating current (AC) signals with an asymmetrical wave shape...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211844/a-tool-named-iris-for-versatile-high-throughput-phenotyping-in-microorganisms
#20
George Kritikos, Manuel Banzhaf, Lucia Herrera-Dominguez, Alexandra Koumoutsi, Morgane Wartel, Matylda Zietek, Athanasios Typas
Advances in our ability to systematically introduce and track controlled genetic variance in microorganisms have, in the past decade, fuelled high-throughput reverse genetics approaches. When coupled to quantitative readouts, such approaches are extremely powerful at elucidating gene function and providing insights into the underlying pathways and the overall cellular network organization. Yet, until now, all efforts to quantify microbial macroscopic phenotypes have been restricted to monitoring growth in a small number of model microorganisms...
February 17, 2017: Nature Microbiology
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