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bacteria adhesion and biofilm formation

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https://www.readbyqxmd.com/read/28529865/hyaluronic-acid-and-its-composites-as-a-local-antimicrobial-antiadhesive-barrier
#1
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: J Bone Jt Infect
https://www.readbyqxmd.com/read/28513133/antibacterial-property-of-a-polyethylene-glycol-grafted-dental-material
#2
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 17, 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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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...
April 6, 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
#10
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
#11
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
https://www.readbyqxmd.com/read/28400767/the-periplasmic-chaperone-network-of-campylobacter-jejuni-evidence-that-salc-cj1289-and-ppid-cj0694-are-involved-in-maintaining-outer-membrane-integrity
#12
Aidan J Taylor, Shadi A I Zakai, David J Kelly
The outer membrane (OM) of Gram-negative pathogenic bacteria is a key structure in host-pathogen interactions that contains a plethora of proteins, performing a range of functions including adhesion, nutrient uptake, export of effectors and interaction with innate and adaptive components of the immune system. In addition, the OM can exclude drugs and thus contribute to antimicrobial resistance. The OM of the food-borne pathogen Campylobacter jejuni contains porins, adhesins and other virulence factors that must be specifically localized to this membrane, but the protein sorting mechanisms involved are only partially understood...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28364672/efficacy-of-a-mouthrinse-based-on-hydroxyapatite-to-reduce-initial-bacterial-colonisation-in-situ
#13
A Kensche, C Holder, S Basche, N Tahan, C Hannig, M Hannig
OBJECTIVE: The present in situ - investigation aimed to specify the impact of pure hydroxyapatite microclusters on initial bioadhesion and bacterial colonization at the tooth surface. DESIGN: Pellicle formation was carried out in situ on bovine enamel slabs (9 subjects). After 1min of pellicle formation rinses with 8ml of hydroxyapatite (HA) microclusters (5%) in bidestilled water or chlorhexidine 0.2% were performed. As negative control no rinse was adopted. In situ biofilm formation was promoted by the intraoral slab exposure for 8h overnight...
March 23, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28362216/strategies-for-combating-bacterial-biofilms-a-focus-on-anti-biofilm-agents-and-their-mechanisms-of-action
#14
Ranita Roy, Monalisa Tiwari, Gianfranco Donelli, Vishvanath Tiwari
Biofilm refers to the complex, sessile communities of microbes found either attached to a surface or buried firmly in an extracellular matrix as aggregates. The biofilm matrix surrounding bacteria makes them tolerant to harsh conditions and resistant to antibacterial treatments. Moreover, the biofilms are responsible for causing a broad range of chronic diseases and due to the emergence of antibiotic resistance in bacteria it has really become difficult to treat them with efficacy. Furthermore, the antibiotics available till date are ineffective for treating these biofilm related infections due to their higher values of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), which may result in in-vivo toxicity...
March 31, 2017: Virulence
https://www.readbyqxmd.com/read/28361145/substrate-effects-on-cell-envelope-deformation-during-early-stage-staphylococcus-aureus-biofilm-formation
#15
Jiahua Gu, Antonio Valdevit, Tseng-Ming Chou, Matthew Libera
Bacterial adhesion to a surface is the first step in biofilm formation, and adhesive forces between the surface and a bacterium are believed to give rise to planktonic-to-biofilm phenotypic changes. Here we use Focused-Ion-Beam (FIB) tomography with backscattered scanning electron microscopy (SEM) to image Staphyolococcus aureus (S. aureus) biofilms grown on Au-coated polystyrene (PS) and Au-coated PS modified by mixed thiols of triethylene glycol mono-11-mercaptoundecyl ether (EG3) and 1-dodecanethiol (CH3)...
April 19, 2017: Soft Matter
https://www.readbyqxmd.com/read/28352177/lipase-degradation-of-plasticized-polyvinyl-chloride-endotracheal-tube-surfaces-to-create-nanoscale-features
#16
Mary C Machado, Thomas J Webster
Polyvinyl chloride (PVC) endotracheal tubes (ETTs) nanoetched with a fungal lipase have been shown to reduce bacterial growth and biofilm formation and could be an inexpensive solution to the complex problem of ventilator-associated pneumonia (VAP). Although bacterial growth and colonization on these nanoetched materials have been well characterized, little is known about the mechanism by which the fungal lipase degrades the PVC and, thus, alters its properties to minimize bacteria functions. This study used X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) to better describe the surface chemistry of both unetched and lipase nanoetched PVC ETT...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28343672/effect-of-titanium-and-zirconia-dental-implant-abutments-on-a-cultivable-polymicrobial-saliva-community
#17
Erica D de Avila, Carlos Eduardo Vergani, Francisco A Mollo Junior, Miguel Jafelicci Junior, Wenyuan Shi, Renate Lux
STATEMENT OF PROBLEM: Periimplantitis is considered the most important biological complication responsible for late implant failure. The physical chemical properties intrinsic to each material can affect the first step to biofilm development and is an important precursor to the adaptive behavior of pathogenic bacteria species. PURPOSE: The purpose of this in vitro study was to evaluate the effect of 2 commercially available implant abutment materials on the adhesion phase and biofilm formation...
March 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28341674/interbacterial-adhesion-networks-within-the-early-oral-biofilm-of-individual-human-hosts
#18
Robert J Palmer, Nehal Shah, Alex Valm, Bruce Paster, Floyd Dewhirst, Taichi Inui, John O Cisar
Specific interbacterial adhesion, termed coaggregation, is well established for three early colonizers of the plaque biofilm: streptococci, actinomyces, and veillonellae. However, little is known about interactions of other early colonizers, and about the extent of interactions within the bacterial community from a single host. To address these gaps, subject-specific culture collections from two individuals were established using an intra-oral biofilm retrieval device. Molecular taxonomy (Human Oral Microbe Identification Microarray: HOMIM) of biofilm samples corroborated integrity and completeness of the collections...
March 24, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28339597/compositional-differences-in-multi-species-biofilms-formed-on-various-orthodontic-adhesives
#19
Jung-Sub An, Kyungsun Kim, Soha Cho, Bum-Soon Lim, Sug-Joon Ahn
Objectives: To investigate the aspects of multi-species biofilm formation on various orthodontic adhesives with different surface characteristics. Methods: Multi-species biofilms using 13 bacterial species were grown on the surfaces of composite, compomer, and resin-modified glass-ionomer cement (RMGI). The changes in Streptococcus mutans (Sm), Streptococcus sobrinus (Ss), Porphyromonas gingivalis (Pg), Aggregatibacter actinomycetemcomitans (Aa), and total bacteria were determined at day 1 (T1) and day 4 (T2) using real-time polymerase chain reaction...
January 25, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28325767/cohesive-properties-of-the-caulobacter-crescentus-holdfast-adhesin-are-regulated-by-a-novel-c-di-gmp-effector-protein
#20
Kathrin S Sprecher, Isabelle Hug, Jutta Nesper, Eva Potthoff, Mohamed-Ali Mahi, Matteo Sangermani, Volkhard Kaever, Torsten Schwede, Julia Vorholt, Urs Jenal
When encountering surfaces, many bacteria produce adhesins to facilitate their initial attachment and to irreversibly glue themselves to the solid substrate. A central molecule regulating the processes of this motile-sessile transition is the second messenger c-di-GMP, which stimulates the production of a variety of exopolysaccharide adhesins in different bacterial model organisms. In Caulobacter crescentus, c-di-GMP regulates the synthesis of the polar holdfast adhesin during the cell cycle, yet the molecular and cellular details of this control are currently unknown...
March 21, 2017: MBio
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