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bacteria adhesion and biofilm formation

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https://www.readbyqxmd.com/read/28634241/psl-produced-by-mucoid-pseudomonas-aeruginosa-contributes-to-the-establishment-of-biofilms-and-immune-evasion
#1
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/28634238/electron-transport-chain-is-biochemically-linked-to-pilus-assembly-required-for-polymicrobial-interactions-and-biofilm-formation-in-the-gram-positive-actinobacterium-actinomyces-oris
#2
Belkys C Sanchez, Chungyu Chang, Chenggang Wu, Bryan Tran, Hung Ton-That
The Gram-positive actinobacteria Actinomyces spp. are key colonizers in the development of oral biofilms due to the inherent ability of Actinomyces to adhere to receptor polysaccharides on the surface of oral streptococci and host cells. This receptor-dependent bacterial interaction, or coaggregation, requires a unique sortase-catalyzed pilus consisting of the pilus shaft FimA and the coaggregation factor CafA forming the pilus tip. While the essential role of the sortase machine SrtC2 in pilus assembly, biofilm formation, and coaggregation has been established, little is known about trans-acting factors contributing to these processes...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28617343/study-of-the-relation-between-the-resonance-behavior-of-thickness-shear-mode-tsm-sensors-and-the-mechanical-characteristics-of-biofilms
#3
Pedro Castro, Luis Elvira, Juan Ramón Maestre, Francisco Montero de Espinosa
This work analyzes some key aspects of the behavior of sensors based on piezoelectric Thickness Shear Mode (TSM) resonators to study and monitor microbial biofilms. The operation of these sensors is based on the analysis of their resonance properties (both resonance frequency and dissipation factor) that vary in contact with the analyzed sample. This work shows that different variations during the microorganism growth can be detected by the sensors and highlights which of these changes are indicative of biofilm formation...
June 15, 2017: Sensors
https://www.readbyqxmd.com/read/28599578/antimicrobial-and-bone-forming-activity-of-a-copper-coated-implant-in-a-rabbit-model
#4
Cornelia Prinz, Mohamed Elhensheri, Joachim Rychly, Hans-Georg Neumann
Current strategies in implant technology are directed to generate bioactive implants that are capable to activate the regenerative potential of the surrounding tissue. On the other hand, implant-related infections are a common problem in orthopaedic trauma patients. To meet both challenges, i.e. to generate a bone implant with regenerative and antimicrobial characteristics, we tested the use of copper coated nails for surgical fixation in a rabbit model. Copper acetate was galvanically deposited with a copper load of 1 µg/mm(2) onto a porous oxide layer of Ti6Al4V nails, which were used for the fixation of a tibia fracture, inoculated with bacteria...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28595324/bacteriophage-use-to-control-salmonella-biofilm-on-surfaces-present-in-chicken-slaughterhouses
#5
Keila Carolina de Ornellas Dutka Garcia, Isadora Mainieri de Oliveira Corrêa, Larissa Quinto Pereira, Tarcísio Macedo Silva, Mateus de Souza Ribeiro Mioni, Ana Carolina de Moraes Izidoro, Igor Henrique Vellano Bastos, Guilherme Augusto Marietto Gonçalves, Adriano Sakai Okamoto, Raphael Lucio Andreatti Filho
Foodborne diseases represent a major risk to public health worldwide. Pathogenic bacteria can live in the form of biofilm within the food industry, providing a permanent source of contamination. The aim of this study was to evaluate the influence of the types of adhesion surfaces on Salmonella biofilm formation at eight different times, and analyze the action time of a bacteriophage pool on established biofilms. Most of the samples used were classified as weak biofilm producers, with serovars Enteritidis and Heidelberg showing the highest frequency of biofilm formation...
June 8, 2017: Poultry Science
https://www.readbyqxmd.com/read/28585390/type-4-pili-are-dispensable-for-biofilm-development-in-the-cyanobacterium-synechococcus-elongatus
#6
Elad Nagar, Shaul Zilberman, Eleonora Sendersky, Ryan Simkovsky, Eyal Shimoni, Diana Gershtein, Moshe Herzberg, Susan S Golden, Rakefet Schwarz
The hair-like cell appendages denoted as type IV pili are crucial for biofilm formation in diverse eubacteria. The protein complex responsible for type IV pilus assembly is homologous with the type II protein secretion complex. In the cyanobacterium Synechococcus elongatus PCC 7942, the gene Synpcc7942_2071 encodes an ATPase homologue of type II/type IV systems. Here we report that inactivation of Synpcc7942_2071 strongly affected the suite of proteins present in the extracellular milieu (exo-proteome) and eliminated pili observable by electron microscopy...
June 5, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28579540/a-multi-defense-strategy-enhancing-bactericidal-activity-of-a-medical-grade-polymer-with-a-nitric-oxide-donor-and-surface-immobilized-quaternary-ammonium-compound
#7
Jitendra Pant, Jing Gao, Marcus J Goudie, Sean P Hopkins, Jason Locklin, Hitesh Handa
Although the use of biomedical devices in hospital-based care is inevitable, unfortunately, it is also one of the leading causes of the nosocomial infections, and thus demands development of novel antimicrobial materials for medical device fabrication. In the current study, a multi-defense mechanism against Gram-positive and Gram-negative bacteria is demonstrated by combining a nitric oxide (NO) releasing agent with a quaternary ammonium antimicrobial that can be covalently grafted to medical devices. Antibacterial polymeric composites were fabricated by incorporating an NO donor, S-nitroso-N-acetyl-penicillamine (SNAP) in CarboSil® polymer and top coated with surface immobilized benzophenone based quaternary ammonium antimicrobial (BPAM) small molecule...
June 1, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28576044/effects-of-dnase-i-coating-of-titanium-on-bacteria-adhesion-and-biofilm-formation
#8
Jing Ye, Can Shao, Xu Zhang, Xuyun Guo, Ping Gao, Yunzhu Cen, Shiqing Ma, Ying Liu
The removal of mature biofilm from the surface of implant has been a formidable challenge in treating implant-associated infection. Prevention of biofilm formation rather than removal of existing biofilm is a more effective approach. Immobilization of biofilm-dispersing enzymes on material surfaces is regarded as one of the most promising strategies. Deoxyribonuclease I (DNase I) can degrade extracellular DNA (eDNA) and then destabilize biofilm. In this study, DNase I was immobilized on a titanium (Ti) surface by using dopamine as an intermediate...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28569502/prevention-of-bacterial-colonization-on-catheters-by-a-one-step-coating-process-involving-an-antibiofouling-polymer-in-water
#9
Hyeongseop Keum, Jin Yong Kim, Byeongjun Yu, Seung Jung Yu, Jinjoo Kim, Hyungsu Jeon, Dong Yun Lee, Sung Gap Im, Sangyong Jon
As reports of multidrug resistant pathogens have increased, patients with implanted medical catheters increasingly need alternative solutions to antibiotic treatments. As most catheter-related infections are directly associated with biofilm formation on the catheter surface, which, once formed, is difficult to eliminate, a promising approach to biofilm prevention involves inhibiting the initial adhesion of bacteria to the surface. In this study, we report an amphiphilic, antifouling polymer, poly(DMA-mPEGMA-AA) that can facilely coat the surfaces of commercially available catheter materials in water and prevent bacterial adhesion to and subsequent colonization of the surface, giving rise to an antibiofilm surface...
June 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28529865/hyaluronic-acid-and-its-composites-as-a-local-antimicrobial-antiadhesive-barrier
#10
REVIEW
C L Romanò, E De Vecchi, M Bortolin, I Morelli, L Drago
Living in biofilms is probably the most common condition for bacteria and fungi and biofilm-related infections account for the majority of bacterial infectious diseases worldwide. Among others biofilm-related infections, those associated with implanted biomaterials have an enormous and still largely underestimated impact in orthopaedics and trauma, cardio-surgery and several other surgical disciplines. Given the limited efficacy of existing antibiotics in the prevention and treatment of bacterial biofilms, new strategies are needed to protect implants and host tissues, overcoming the striking ability of the microorganisms to adhere on different surfaces and to immediately protect themselves by forming the biofilm matrix...
2017: Journal of bone and joint infection
https://www.readbyqxmd.com/read/28513133/antibacterial-property-of-a-polyethylene-glycol-grafted-dental-material
#11
Liying Peng, Li Chang, Xi Liu, Jiuxiang Lin, Hongliang Liu, Bing Han, Shutao Wang
Dental materials often cause bacterial adhesion and promote bacterial biofilm formation, which brings a series of long-standing and significant problems in oral health. However, the current development of antibacterial research in dental devices is limited by the lack of materials endowed with good antibacterial properties against oral bacteria. Here, we present a new strategy for reducing the initial adhesion of bacterial on dental biomaterials by chemically bonding long-chain polyethylene glycol. Our work represents an important step toward solving the problem of bacterial accumulation on dental devices...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28485690/-it-s-a-gut-feeling-escherichia-coli-biofilm-formation-in-the-gastrointestinal-tract-environment
#12
Elio Rossi, Annika Cimdins, Petra Lüthje, Annelie Brauner, Åsa Sjöling, Paolo Landini, Ute Römling
Escherichia coli can commonly be found, either as a commensal, probiotic or a pathogen, in the human gastrointestinal (GI) tract. Biofilm formation and its regulation is surprisingly variable, although distinct regulatory pattern of red, dry and rough (rdar) biofilm formation arise in certain pathovars and even clones. In the GI tract, environmental conditions, signals from the host and from commensal bacteria contribute to shape E. coli biofilm formation within the multi-faceted multicellular communities in a complex and integrated fashion...
May 9, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28475985/long-alkyl-chain-imidazolium-ionic-liquids-antibiofilm-activity-against-phototrophic-biofilms
#13
G Kiran Kumar Reddy, Y V Nancharaiah, V P Venugopalan
Biofilm formation is problematic and hence undesirable in medical and industrial settings. In addition to bacteria, phototrophic organisms are an integral component of biofilms that develop on surfaces immersed in natural waters. 1-Alkyl-3-methyl imidazolium ionic liquids (IL) with varying alkyl chain length were evaluated for their influence on the formation of monospecies (Navicula sp.) and multispecies biofilms under phototrophic conditions. An IL with a long alkyl side chain, 1-hexadecyl-3-methylimidaazolium chloride ([C16(MIM)][Cl]) retarded growth, adhesion and biofilm formation of Navicula sp...
April 23, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28470798/alternative-pathways-for-escherichia-coli-biofilm-formation-revealed-by-srna-overproduction
#14
Ashley Parker, Suanur Cureoglu, Nicholas De Lay, Nadim Majdalani, Susan Gottesman
Small regulatory RNAs have major roles in many regulatory circuits in Escherichia coli and other bacteria, including the transition from planktonic to biofilm growth. We tested Hfq-dependent sRNAs in E. coli for their ability, when overproduced, to inhibit or stimulate biofilm formation, in two different growth media. We identify two mutually exclusive pathways for biofilm formation. In LB, PgaA, encoding an adhesion export protein, played a critical role; biofilm was independent of the general stress factor RpoS or CsgD, regulator of curli and other biofilm genes...
May 4, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28470309/characterization-of-non-dialyzable-constituents-from-cranberry-juice-that-inhibit-adhesion-co-aggregation-and-biofilm-formation-by-oral-bacteria
#15
C C Neto, K A Penndorf, M Feldman, S Meron-Sudai, Z Zakay-Rones, D Steinberg, M Fridman, Y Kashman, I Ginsburg, I Ofek, E I Weiss
An extract prepared from cranberry juice by dialysis known as nondialyzable material (NDM) has been shown previously to possess anti-adhesion activity toward microbial species including oral bacteria, uropathogenic Escherichia coli and Helicobacter pylori. Bioassay-guided fractionation of cranberry NDM was therefore undertaken to identify the anti-adhesive constituents. An aqueous acetone-soluble fraction (NDMac) obtained from Sephadex LH-20 inhibited adhesion-linked activities by oral bacteria, including co-aggregation of oral bacteria Fusobacterium nucleatum with Streptococcus sanguinis or Porphyromonas gingivalis, and biofilm formation by Streptococcus mutans...
May 24, 2017: Food & Function
https://www.readbyqxmd.com/read/28457443/dextran-production-by-lactobacillus-sakei-mn1-coincides-with-reduced-autoagglutination-biofilm-formation-and-epithelial-cell-adhesion
#16
Montserrat Nácher-Vázquez, Iñaki Iturria, Kenza Zarour, Maria Luz Mohedano, Rosa Aznar, Miguel Ángel Pardo, Paloma López
In this work we have investigated two dextran-producing lactic acid bacteria, Lactobacillus sakei MN1 and Leuconostoc mesenteroides RTF10, isolated from fermented meat products. These bacteria synthesise dextran when sucrose, but not glucose, is present in the growth medium. The influence of dextran on bacterial aggregation, adhesion and biofilm formation was investigated in cultures challenged with sucrose or glucose. For Lb. sakei MN1, the synthesis of the dextran drastically impaired the three processes; in contrast it had no effect on Lc...
July 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28447965/perspectives-of-using-of-aseptic-drains-for-abdominal-drainage
#17
Merab Kiladze, Paata Tutberidze, Maka Gogoladze, David Tugushi, Ramaz Katsarava, Tsismari Gatenadze
AIM: Aim of the study was to evaluate the effectiveness of using different types of drain tubes to prevent and reduce the drain-associated infection rate of abdominal drainage procedures. MATERIALS AND METHODS: 80 cases of used so called "standard", "coladerm" and "chlorhexidine" drain tubes for abdominal drainage were analysed. "Standard" drain tubes were used 35 times and "coladerm" and "chlorhexidine" tubes - 20 and 25 times respectively. There were adopted in different elective and emergency so called "clean", "potentially contaminated" and "contaminated" abdominal surgical procedures...
2017: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/28416278/ai-2-quorum-sensing-negatively-regulates-rbf-expression-and-biofilm-formation-in-staphylococcus-aureus
#18
Ronghua Ma, Shuwan Qiu, Qiu Jiang, Haipeng Sun, Ting Xue, Gang Cai, Baolin Sun
Staphylococcus aureus is an important pathogen that is capable of forming biofilms on biomaterial surfaces to cause biofilm-associated infections. Autoinducer 2 (AI-2), a universal language for interspecies communication, is involved in a variety of physiological activities, although its exact role in Gram-positive bacteria, especially in S. aureus, is not yet thoroughly characterized. Herein we demonstrate that inactivation of luxS, which encodes AI-2 synthase, resulted in increased biofilm formation and higher polysaccharide intercellular adhesion (PIA) production compared with the wild-type strain in S...
June 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28414439/mitigation-of-thin-film-composite-membrane-biofouling-via-immobilizing-nano-sized-biocidal-reservoirs-in-the-membrane-active-layer
#19
Alireza Zirehpour, Ahmad Rahimpour, Ahmad Arabi Shamsabadi, Mohammad Sharifian Gh, Masoud Soroush
This work investigates the use of a silver-based metal-organic framework (MOF) for mitigating biofouling in forward-osmosis thin-film composite (TFC) membranes. This is the first study of the use of MOFs for biofouling control in membranes. MOF nanocrystals were immobilized in the active layer of the membranes via dispersion in the organic solution used for interfacial polymerization. Field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) characterization results showed the presence of the MOF nanocrystals in the active layer of the membranes...
April 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28403648/consumption-of-apple-boysenberry-beverage-decreases-salivary-actinomyces-naeslundii-and-their-adhesion-in-a-multi-species-biofilm-model
#20
S G Parkar, S Eady, M Cabecinha, M A Skinner
We hypothesised that consumption of beverage rich in both fibre and polyphenols, rather than each bioactive alone, will modulate populations of selected salivary bacteria, and their adhesion characteristics and that some of these effects may be due to the anti-microbial activity of the beverage bioactives. We investigated the effect of 4 weeks' consumption of beverages, rich in apple fibre, boysenberry polyphenols, or both on salivary bacteria in healthy subjects. In this placebo-controlled crossover study, saliva samples were collected at the beginning and end of each treatment period, and used for qPCR quantitation of Lactobacillus spp...
April 26, 2017: Beneficial Microbes
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