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Biofilm formation

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https://www.readbyqxmd.com/read/29356249/effect-of-origanum-vulgare-essential-oil-on-biofilm-formation-and-motility-capacity-of-pseudomonas-fluorescens-strains-isolated-from-discolored-mozzarella-cheese
#1
Chiara Rossi, Clemencia Chaves-López, Annalisa Serio, Fabrizio Anniballi, Luca Valbonetti, Antonello Paparella
AIMS: The study was focused on P. fluorescens strains isolated from Mozzarella cheese, with the aim of evaluating the effects of Origanum vulgare L. essential oil (OEO) on the biofilm formation and eradication, as well as on the motility and blue pigment production at 10°C. METHODS AND RESULTS: Microdilution method was used to determine the minimum inhibitory and bactericidal concentration of the OEO, which ranged between 10 and 40 μl ml-1 . In vitro studies demonstrated that a sub-lethal concentration of OEO influenced not only P...
January 21, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29355424/silver-diamine-fluoride-a-successful-anticarious-solution-with-limits
#2
J O Burgess, P M Vaghela
Silver diamine fluoride (SDF) is a solution containing ionic silver, fluoride, and ammonia that arrests the progress of carious lesions and prevents the development of future caries. The silver particle extends into the dentin tubules and could create some bonding problems for subsequent composite resin restorations placed over SDF-treated darkened tooth structures. The fluoride penetrates deeper into the tooth with SDF as compared with other fluoride solutions, creating a fluoride reservoir in the tooth structure...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29355422/oral-microbiome-studies-potential-diagnostic-and-therapeutic-implications
#3
A Mira
Understanding the microbiology of dental caries is not a mere academic exercise; it provides the basis for preventive, diagnostic, and treatment strategies and gives the dentist a theoretical framework to become a better professional. The last years have seen the development of new research methodologies, ranging from high-throughput sequencing or "omics" techniques to new fluorescence microscopy applications and microfluidics, which have allowed the study of the oral microbiome to an unprecedented level of detail...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29355421/therapeutic-strategies-targeting-cariogenic-biofilm-microenvironment
#4
Y Liu, Z Ren, G Hwang, H Koo
Cariogenic biofilms are highly structured microbial communities embedded in an extracellular matrix, a multifunctional scaffold that is essential for the existence of the biofilm lifestyle and full expression of virulence. The extracellular matrix provides the physical and biological properties that enhance biofilm adhesion and cohesion, as well as create a diffusion-modulating milieu, protecting the resident microbes and facilitating the formation of localized acidic pH niches. These biochemical properties pose significant challenges for the development of effective antibiofilm therapeutics to control dental caries...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29355420/the-anticaries-efficacy-of-a-1-5-arginine-and-fluoride-toothpaste
#5
M S Wolff, A B Schenkel
Dental caries remains a world-wide disease despite the global distribution of fluoride. It has become apparent that the introduction of significant levels of sugar (fermentable carbohydrate) into the diet has resulted in a change in the biofilm, encouraging acid formation. Further, there has been a shift in the microbiota in the biofilm to a flora that produces acid, and thrives and reproduces in an acidic environment. The management of caries activity under these conditions has focused on brushing to remove the biofilm with fluoride pastes, and high-dose fluoride treatments...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29355416/antimicrobial-activity-of-a-colloidal-agnp-suspension-demonstrated-in-vitro-against-monoculture-biofilms-toward-a-novel-tooth-disinfectant-for-treating-dental-caries
#6
D R Schwass, K M Lyons, R Love, G R Tompkins, C J Meledandri
A novel silver nanoparticle (AgNP) formulation was developed as a targeted application for the disinfection of carious dentine. Silver nitrate (AgNO3) was chemically reduced using sodium borohydrate (NaBH4) in the presence of sodium dodecyl sulfate (SDS) to form micelle aggregate structures containing monodisperse 6.7- to 9.2-nm stabilized AgNPs. AgNPs were characterized by measurement of electrical conductivity and dynamic light scattering, scanning electron microscopy, transmission electron microscopy, and inductively coupled plasma mass spectrometry...
February 2018: Advances in Dental Research
https://www.readbyqxmd.com/read/29354778/the-efficacy-of-gaseous-ozone-against-different-forms-of-candida-albicans
#7
M Zargaran, M Fatahinia, A Zarei Mahmoudabadi
Background and Purpose: Ozone is an inorganic molecule with effective antimicrobial properties. Clinical treatment of ozonated water was used for the elimination of Candidaalbicans, Enterococcus faecalis, endotoxins, and biofilms from root canals. In addition, its therapeutic effects for tinea pedis, ulcers, and leishmaniasis were investigated. The purpose of the present study was to evaluate the fungicidal effects of ozone on different forms of C. albicans. In addition, antifungal susceptibility profile of strains was assessed before and after exposure to ozone...
June 2017: Advances in Medical Mycology (Iran)
https://www.readbyqxmd.com/read/29354366/control-of-corrosive-bacterial-community-by-bronopol-in-industrial-water-system
#8
Jayaraman Narenkumar, Nachimuthu Ramesh, Aruliah Rajasekar
Abstract: Ten aerobic corrosive bacterial strains were isolated from a cooling tower water system (CWS) which were identified based on the biochemical characterization and 16S rRNA gene sequencing. Out of them, dominant corrosion-causing bacteria, namely, Bacillus thuringiensis EN2, Terribacillus aidingensis EN3, and Bacillus oleronius EN9, were selected for biocorrosion studies on mild steel 1010 (MS) in a CWS. The biocorrosion behaviour of EN2, EN3, and EN9 strains was studied using immersion test (weight loss method), electrochemical analysis, and surface analysis...
January 2018: 3 Biotech
https://www.readbyqxmd.com/read/29353476/hordenine-a-novel-quorum-sensing-inhibitor-and-anti-biofilm-agent-against-pseudomonas-aeruginosa
#9
Jin-Wei Zhou, Huai-Zhi Luo, Huan Jiang, Ting-Kun Jian, Zi-Qian Chen, Ai-Qun Jia
The quorum sensing (QS) inhibitory activity of hordenine from sprouting barley against foodborne pathogen Pseudomonas aeruginosa was evaluated for the first time here. At concentrations ranging from 0.5 to 1.0 mg mL-1, hordenine inhibited the levels of acyl-homoserine lactones (AHLs). The enhanced susceptibility of hordenine with netilmicin on P. aeruginosa PAO1 biofilm formation as well as their efficiency in disrupting preformed biofilms was also evaluated using scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM)...
January 21, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29353420/properties-of-antibiotic-resistant-bacteria-isolated-from-onsite-wastewater-treatment-plant-in-relation-to-biofilm-formation
#10
Łukasz Jałowiecki, Joanna Żur, Joanna Chojniak, Helene Ejhed, Grażyna Płaza
The aim of the present study was to determine some properties of antibiotic-resistant bacterial strains isolated from onsite wastewater technology in relation to biofilm formation, e.g., autoaggregation and motility. Additionally, biosurfactant production by the isolates was also evaluated. The ability of selected strains to develop a biofilm was assessed by using the crystal violet method, which allows to indirectly quantify the attached bacterial biomass (live, dead cells, and polysaccharides as well). Obtained results showed that 19 of the analyzed strains were able to produce biofilm after 72 h of incubation...
January 20, 2018: Current Microbiology
https://www.readbyqxmd.com/read/29353377/highly-synergistic-activity-of-melittin-with-imipenem-and-colistin-in-biofilm-inhibition-against-multidrug-resistant-strong-biofilm-producer-strains-of-acinetobacter-baumannii
#11
Ali Mohammadi Bardbari, Mohammad Reza Arabestani, Manoochehr Karami, Fariba Keramat, Hossein Aghazadeh, Mohammad Yousef Alikhani, Kamran Pooshang Bagheri
The rapid increase of drug resistance and failure of available antibiotics to treat biofilm-associated infections is of great health concern. Accordingly, our study aimed to evaluate the synergistic antibacterial, biofilm inhibitory, and biofilm removal activities of melittin in combination with colistin, imipenem, and ciprofloxacin against multidrug-resistant (MDR) strong biofilm producer Acinetobacter baumannii isolates. The kinetics of biofilm formation were evaluated for the isolates for 144 h. Minimum inhibitory concentrations (MICs), minimum bactericidal concentrations (MBCs), minimum biofilm inhibitory concentrations (MBICs), and biofilm removal activities for melittin and combinations with antibiotics were determined...
January 20, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29352409/recent-perspectives-on-the-molecular-basis-of-biofilm-formation-by-pseudomonas-aeruginosa-and-approaches-for-treatment-and-biofilm-dispersal
#12
REVIEW
Sinosh Skariyachan, Vaishnavi Sneha Sridhar, Swathi Packirisamy, Supreetha Toplar Kumargowda, Sneha Basavaraj Challapilli
Pseudomonas aeruginosa, a Gram-negative, rod-shaped bacterium causes widespread diseases in humans. This bacterium is frequently related to nosocomial infections such as pneumonia, urinary tract infections (UTIs) and bacteriaemia especially in immunocompromised patients. The current review focuses on the recent perspectives on biofilms formation by these bacteria. Biofilms are communities of microorganisms in which cells stick to each other and often adhere to a surface. These adherent cells are usually embedded within a self-produced matrix of extracellular polymeric substance (EPS)...
January 19, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29351199/biofilm-forming-potential-of-staphylococcus-aureus-isolated-from-clinical-mastitis-cases-in-new-zealand
#13
Shirli Notcovich, Gina DeNicolo, Steve H Flint, Norman B Williamson, Kristene Gedye, Alex Grinberg, Nicolas Lopez-Villalobos
Biofilm formation is of growing concern in human and animal health. However, it is still unclear how biofilms are related to mastitis infections in dairy cattle. In this study, a comparison between two tests for biofilm formation and the association between biofilm and the presence of genes associated with biofilm formation were investigated for 92 Staphylococcus aureus isolates from clinical mastitis cases. Congo red agar (CRA) and microtitre test assay (MTA) in vitro phenotypic tests were used to evaluate biofilm formation...
January 19, 2018: Veterinary Sciences
https://www.readbyqxmd.com/read/29348586/analogues-of-disulfides-from-allium-stipitatum-demonstrate-potent-anti-tubercular-activities-through-drug-efflux-pump-and-biofilm-inhibition
#14
Cynthia A Danquah, Eleftheria Kakagianni, Proma Khondkar, Arundhati Maitra, Mukhlesur Rahman, Dimitrios Evangelopoulos, Timothy D McHugh, Paul Stapleton, John Malkinson, Sanjib Bhakta, Simon Gibbons
Disulfides from Allium stipitatum, commonly known as Persian shallot, were previously reported to possess antibacterial properties. Analogues of these compounds, produced by S-methylthiolation of appropriate thiols using S-methyl methanethiosulfonate, exhibited antimicrobial activity, with one compound inhibiting the growth of Mycobacterium tuberculosis at 17 µM (4 mg L-1) and other compounds inhibiting Escherichia coli and multi-drug-resistant (MDR) Staphylococcus aureus at concentrations ranging between 32-138 µM (8-32 mg L-1)...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348582/nanostructured-titanium-surfaces-exhibit-recalcitrance-towards-staphylococcus-epidermidis-biofilm-formation
#15
Yunyi Cao, Bo Su, Subash Chinnaraj, Saikat Jana, Leon Bowen, Sam Charlton, Pengfei Duan, Nicholas S Jakubovics, Jinju Chen
Titanium-based implants are ubiquitous in the healthcare industries and often suffer from bacterial attachment which results in infections. An innovative method of reducing bacterial growth is to employ nanostructures on implant materials that cause contact-dependent cell death by mechanical rupture of bacterial cell membranes. To achieve this, we synthesized nanostructures with different architectures on titanium surfaces using hydrothermal treatment processes and then examined the growth of Staphylococcus epidermidis on these surfaces...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348527/the-human-muscarinic-acetylcholine-receptor-antagonist-dicyclomine-targets-signal-transduction-genes-and-inhibits-the-virulence-factors-in-the-human-pathogen-candida-albicans
#16
Awad Ali, Ashwini Jadhav, Priyanka Jangid, Rajendra Patil, Amruta Shelar, Sankunny Mohan Karuppayil
Dicyclomine is a human muscarinic acetylcholine receptor antagonist used for the treatment of abdominal cramps. We are reporting here that dicyclomine can inhibit the in vitro growth and virulence factors of the human pathogen Candida albicans very effectively. Dicyclomine inhibited adhesion, early biofilm, mature biofilm, and planktonic growth. Yeast to hyphal form transition of C. albicans in various inducer media such as serum, proline, glucose, and N-acetylglucosamine was inhibited. Dicyclomine also could kill C...
January 18, 2018: Journal of Antibiotics
https://www.readbyqxmd.com/read/29348452/combination-therapy-strategy-of-quorum-quenching-enzyme-and-quorum-sensing-inhibitor-in-suppressing-multiple-quorum-sensing-pathways-of-p-aeruginosa
#17
July Fong, Chaodong Zhang, Renliang Yang, Zhao Zhi Boo, Soon Keat Tan, Thomas E Nielsen, Michael Givskov, Xue-Wei Liu, Wu Bin, Haibin Su, Liang Yang
The threat of antibiotic resistant bacteria has called for alternative antimicrobial strategies that would mitigate the increase of classical resistance mechanism. Many bacteria employ quorum sensing (QS) to govern the production of virulence factors and formation of drug-resistant biofilms. Targeting the mechanism of QS has proven to be a functional alternative to conventional antibiotic control of infections. However, the presence of multiple QS systems in individual bacterial species poses a challenge to this approach...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348094/in-vitro-salmonella-typhi-biofilm-formation-on-gallstones-and-its-disruption-by-manuka-honey
#18
Abdul Hannan, Asma Ejaz Bajwa, Saira Riaz, Usman Arshad, Sidrah Saleem, Usama Ijaz Bajwa
Biofilm is a complex community of single or different types of microorganisms (bacteria, viruses, fungi, protozoa) attached to a surface and stick to each other through production of extracellular matrix. Salmonella typhi forms biofilm on cholesterol gallstones resulting in carrier state. Once formed, biofilm is difficult to treat. To date cholecystectomy is the only cure for this condition. Manuka honey is known to have tremendous antibiofilm activity against various organisms. S. typhi biofilm was grown in vitro on clinical samples of human cholesterol gallstones by Gallstone tube assay method for 12 days...
January 2018: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29347676/twitching-motility-of-bacteria-with-type-iv-pili-fractal-walks-first-passage-time-and-their-consequences-on-microcolonies
#19
Konark Bisht, Stefan Klumpp, Varsha Banerjee, Rahul Marathe
A human pathogen, Neisseria gonorrhoeae (NG), moves on surfaces by attaching and retracting polymeric structures called Type IV pili. The tug-of-war between the pili results in a two-dimensional stochastic motion called twitching motility. In this paper, with the help of real-time NG trajectories, we develop coarse-grained models for their description. The fractal properties of these trajectories are determined and their influence on first passage time and formation of bacterial microcolonies is studied. Our main observations are as follows: (i) NG performs a fast ballistic walk on small time scales and a slow diffusive walk over long time scales with a long crossover region; (ii) there exists a characteristic persistent length l_{p}^{*}, which yields the fastest growth of bacterial aggregates or biofilms...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347525/network-patterns-in-exponentially-growing-two-dimensional-biofilms
#20
Cameron Zachreson, Xinhui Yap, Erin S Gloag, Raz Shimoni, Cynthia B Whitchurch, Milos Toth
Anisotropic collective patterns occur frequently in the morphogenesis of two-dimensional biofilms. These patterns are often attributed to growth regulation mechanisms and differentiation based on gradients of diffusing nutrients and signaling molecules. Here, we employ a model of bacterial growth dynamics to show that even in the absence of growth regulation or differentiation, confinement by an enclosing medium such as agar can itself lead to stable pattern formation over time scales that are employed in experiments...
October 2017: Physical Review. E
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