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bacteria adhesion and biofilm formation

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https://www.readbyqxmd.com/read/29150498/identification-of-a-chez-like-gene-in-azorhizobium-caulinodans-a-key-gene-in-the-control-of-chemotaxis-and-colonization-of-the-host-plant
#1
Xiaolin Liu, Wei Liu, Yu Sun, Chunlei Xia, Claudine Elmerich, Zhihong Xie
Chemotaxis can provide bacteria with competitive advantages for survival in complex environments. The CheZ chemotaxis protein is a phosphatase, affecting the flagellar motor in Escherichia coli, by dephosphorylating the response regulator CheY-P protein responsible for clockwise rotation. A cheZ gene has been found in Azorhizobium caulinodans ORS571, in contrast to other rhizobial species studied so far. The CheZ protein in ORS571 has a conserved motif similar to that corresponding to the phosphatase active site in E...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29140971/effect-of-s-mutans-and-s-sanguinis-on-growth-and-adhesion-of-p-gingivalis-and-their-ability-to-adhere-to-different-dental-materials
#2
Yan Tu, Xiaolong Ling, Yadong Chen, Yuan Wang, Na Zhou, Hui Chen
BACKGROUND Caries and periodontal diseases are caused by the biofilm formed by caries- and periodontal disease-related bacteria. Specific biofilms could be formed on different filling materials in oral cavity. Thus, to explore the inhibition effect of restorative filling materials on biofilm formation is of great significance in the treatment of caries and periodontal disease. MATERIAL AND METHODS The supernatants of S. mutans, S. sanguinis, and P. gingivalis suspension were combined with BHI broth. After 24 h, the live P...
November 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29129313/physico-chemistry-of-bacterial-transmission-versus-adhesion
#3
REVIEW
Niar Gusnaniar, Henny C van der Mei, Wenwen Qu, Titik Nuryastuti, Johanna M M Hooymans, Jelmer Sjollema, Henk J Busscher
Bacterial adhesion is a main problem in many biomedical, domestic, natural and industrial environments and forms the onset of the formation of a biofilm, in which adhering bacteria grow into a multi-layered film while embedding themselves in a matrix of extracellular polymeric substances. It is usually assumed that bacterial adhesion occurs from air or by convective-diffusion from a liquid suspension, but often bacteria adhere by transmission from a bacterially contaminated donor to a receiver surface. Therewith bacterial transmission is mechanistically different from adhesion, as it involves bacterial detachment from a donor surface followed by adhesion to a receiver one...
November 5, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/29119696/antibacterial-isoeugenol-coating-on-stainless-steel-and-polyethylene-surfaces-prevents-biofilm-growth
#4
Christina Krogsgård Nielsen, Guruprakash Subbiahdoss, Guanghong Zeng, Zakaria Salmi, Jørgen Kjems, Tina Mygind, Torben Snabe, Rikke Louise Meyer
AIMS: Pathogenic bacteria can spread between individuals or between food items via the surfaces they share. Limiting the survival of pathogens on surfaces therefore presents an opportunity to limit at least one route of how pathogens spread. In this study we propose that a simple coating with the essential oil isoeugenol can be used to circumvent the problem of bacterial transfer via surfaces. METHODS AND RESULTS: Two commonly used materials, stainless steel and polyethylene, were coated by physical adsorption, and the coatings were characterized by Raman spectroscopy, atomic force microscopy and water contact angle measurements...
November 9, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29111321/inhibition-activity-of-lactobacilli-supernatant-against-fungal-bacterial-multispecies-biofilms-on-silicone
#5
Yulong Tan, Matthias Leonhard, Doris Moser, Berit Schneider-Stickler
Fungal-bacterial multispecies biofilms play a major role in failure of medical silicone devices, such as voice prostheses in laryngectomiy. In this study, we determined the effect of Lactobacilli supernatant (cell free) on mixed biofilm formation of fungi and bacteria on silicone in vitro. Lactobacilli supernatant inhibited the adhesion (90 min) of mixed fungi and bacteria species with an efficiency of >90%. Mixed biofilm formation and the metabolic activity of the biofilms were inhibited by 72.23% and 58...
October 28, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29102795/enhanced-antimicrobial-activity-of-naturally-derived-bioactive-molecule-chitosan-conjugated-silver-nanoparticle-against-dental-implant-pathogens
#6
Darshan Devang Divakar, Nahla Talal Jastaniyah, Hazem Ganem Altamimi, Yasser Obaidallah Alnakhli, Muzaheed, Abdulaziz Abdullah Alkheraif, Shaista Haleem
Various metal coated implants have been tested against dental pathogens which causes increased biofilm formation and lead to failure of dental implants. The possibility of using nanoparticle together with native biomolecules to enhance the activity of such bioactive compound is also in progress. In this study we tested the efficacy of Ag conjugated chitosan nanoparticles as a prospective coating material of titanium dental implants. Known bioactive molecule chitosan was extracted from A. flavus Af09 and conjugated with Ag nanoparticle...
November 1, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29099716/definition-of-etiological-antibiotic-sensitivity-factors-in-purulent-inflammatory-processes
#7
O Dubovyk, М Mishyna, S Malanchuk, A Kuzmenko, O Kozlov
The purpose of the study - assessment of purulent-inflammatory processes etiologic factors and determination of microbial agents' in forms of plankton and biofilms sensitivity to antibiotics. Clinical microbial strains isolated from patients with purulent-inflammatory processes were the subject of the study. The study material comprised of wound tissue, pus, bandage and suture, catheters and drainage devices. Sensitivity of isolates to antimicrobial preparations with various mechanism of activity on the microbial cells was studied with the help of micro-test system...
October 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29089624/combating-virulence-of-gram-negative-bacilli-by-ompa-inhibition
#8
Xavier Vila-Farrés, Raquel Parra-Millán, Viviana Sánchez-Encinales, Monica Varese, Rafael Ayerbe-Algaba, Nuria Bayó, Salvador Guardiola, María Eugenia Pachón-Ibáñez, Martin Kotev, Jesús García, Meritxell Teixidó, Jordi Vila, Jerónimo Pachón, Ernest Giralt, Younes Smani
Preventing the adhesion of pathogens to host cells provides an innovative approach to tackling multidrug-resistant bacteria. In this regard, the identification of outer membrane protein A (OmpA) as a key bacterial virulence factor has been a major breakthrough. The use of virtual screening helped us to identify a cyclic hexapeptide AOA-2 that inhibits the adhesion of Acinetobacter baumannii, Pseudomonas aeruginosa and Escherichia coli to host cells and the formation of biofilm, thereby preventing the development of infection in vitro and in a murine sepsis peritoneal model...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29082999/nanofabrication-of-mechano-bactericidal-surfaces
#9
REVIEW
Denver P Linklater, Saulius Juodkazis, Elena P Ivanova
The search for alternatives to the standard methods of preventing bacterial adhesion and biofilm formation on biotic and abiotic surfaces alike has led to the use of biomimetics to reinvent through nanofabrication methods, surfaces, whereby the nanostructured topography is directly responsible for bacterial inactivation through physico-mechanical means. Plant leaves, insect wings, and animal skin have been used to inspire the fabrication of synthetic high-aspect-ratio nanopillared surfaces, which can resist bacterial colonisation...
November 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/29081915/osteopontin-adsorption-to-gram-positive-cells-reduces-adhesion-forces-and-attachment-to-surfaces-under-flow
#10
M F Kristensen, G Zeng, T R Neu, R L Meyer, V Baelum, S Schlafer
The bovine milk protein osteopontin (OPN) may be an efficient means to prevent bacterial adhesion to dental tissues and control biofilm formation. This study sought to determine to what extent OPN impacts adhesion forces and surface attachment of different bacterial strains involved in dental caries or medical device-related infections. It further investigated if OPN's effect on adhesion is caused by blocking the accessibility of glycoconjugates on bacterial surfaces. Bacterial adhesion was determined in a shear-controlled flow cell system in the presence of different concentrations of OPN, and interaction forces of single bacteria were quantified using single-cell force spectroscopy before and after OPN exposure...
2017: Journal of Oral Microbiology
https://www.readbyqxmd.com/read/29074368/planctomycetes-attached-to-algal-surfaces-insight-into-their-genomes
#11
Mafalda Faria, Nicola Bordin, Jana Kizina, Jens Harder, Damien Devos, Olga M Lage
Planctomycetes are bacteria with complex molecular and cellular biology. They have large genomes, some over 7Mb, and complex life cycles that include motile cells and sessile cells. Some live on the complex biofilm of macroalgae. Factors governing their life in this environment were investigated at the genomic level. We analyzed the genomes of three planctomycetes isolated from algal surfaces. The genomes were 6.6Mbp to 8.1Mbp large. Genes for outer-membrane proteins, peptidoglycan and lipopolysaccharide biosynthesis were present...
October 23, 2017: Genomics
https://www.readbyqxmd.com/read/29072116/attachment-of-anaerobic-ammonium-oxidizing-bacteria-to-augmented-carrier-material
#12
Maciej S Kowalski, Tanner R Devlin, Jan A Oleszkiewicz
The formation of stable and highly active anammox biofilm is a lengthy process leading to long start-up times of deammonifying reactors of several months or more. This study aims to provide a quick and simple solution to the problem of long start-up periods for biofilm reactors by pre-treating the surface of carrier material, thereby increasing attachment rates of anammox cells and creating a significant improvement in the adhesion of cells to the carrier material. Two different techniques were investigated...
October 26, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29064403/characterization-of-three-ocular-clinical-isolates-of-p-aeruginosa-viability-biofilm-formation-adherence-infectivity-and-effects-of-glycyrrhizin
#13
Xudong Peng, Sandamali A Ekanayaka, Sharon A McClellan, Ronald P Barrett, Kerry Vistisen, Linda D Hazlett
We selectively characterized three isolates from Pseudomonas aeruginosa keratitis patients and how glycyrrhizin (GLY) affected them. Type III toxins were determined using polymerase chain reaction (PCR). Minimum Inhibitory Concentration (MIC) of GLY and assays for its effects on: time kill, bacterial permeability, and biofilm/adhesion were done. In vivo, C57BL/6 (B6) mice were treated topically with GLY after G81007 infection. Clinical score, photography with a slit lamp and RT-PCR were used to assess treatment effects...
October 24, 2017: Pathogens
https://www.readbyqxmd.com/read/29063212/staphylococcal-biofilms-in-atopic-dermatitis
#14
REVIEW
Tammy Gonzalez, Jocelyn M Biagini Myers, Andrew B Herr, Gurjit K Khurana Hershey
PURPOSE OF REVIEW: Atopic dermatitis (AD) is a chronic, relapsing inflammatory skin disorder that is a major public health burden worldwide. AD lesions are often colonized by Staphylococcus aureus and Staphylococcus epidermidis. An important aspect of Staphylococcus spp. is their propensity to form biofilms, adhesive surface-attached colonies that become highly resistant to antibiotics and immune responses, and recent studies have found that clinical isolates colonizing AD skin are often biofilm-positive...
October 23, 2017: Current Allergy and Asthma Reports
https://www.readbyqxmd.com/read/29042504/unintended-laboratory-driven-evolution-reveals-genetic-requirements-for-biofilm-formation-by-desulfovibrio-vulgaris-hildenborough
#15
Kara B De León, Grant M Zane, Valentine V Trotter, Gregory P Krantz, Adam P Arkin, Gareth P Butland, Peter J Walian, Matthew W Fields, Judy D Wall
Biofilms of sulfate-reducing bacteria (SRB) are of particular interest as members of this group are culprits in corrosion of industrial metal and concrete pipelines as well as being key players in subsurface metal cycling. Yet the mechanism of biofilm formation by these bacteria has not been determined. Here we show that two supposedly identical wild-type cultures of the SRB Desulfovibrio vulgaris Hildenborough maintained in different laboratories have diverged in biofilm formation. From genome resequencing and subsequent mutant analyses, we discovered that a single nucleotide change within DVU1017, the ABC transporter of a type I secretion system (T1SS), was sufficient to eliminate biofilm formation in D...
October 17, 2017: MBio
https://www.readbyqxmd.com/read/29032514/surface-roughness-and-bacterial-adhesion-on-root-dentin-treated-with-diode-laser-and-conventional-desensitizing-agents
#16
Maiza S Cury, Camilla B Silva, Ruchele D Nogueira, Michelle G D Campos, Regina G Palma-Dibb, Vinicius R Geraldo-Martins
The treatments for dentin hypersensitivity (DH) may change the surface roughness of the root dentin, which can lead to biofilm accumulation, increasing the risk of root caries. The aim was to compare the surface roughness of root dentin after different treatments of DH and the biofilm formation on those surfaces. After initial surface roughness (Sa) assessment, 50 bovine root fragments received the following treatments (n = 10): G 1-no treatment; G2-5% sodium fluoride varnish; G3-professional application of a desensitizing dentifrice; G4-toothbrushing with a desensitizing dentifrice; and G5-diode laser application (908 nm; 1...
October 14, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29025667/adhesion-forces-of-biofilms-developed-in-vitro-from-clinical-strains-of-skin-wounds
#17
Elizabeth Alvarado-Gomez, Mario Perez-Diaz, Donato Valdez-Perez, Jaime Ruiz-Garcia, Martin Magaña-Aquino, Gabriel Martinez-Castañon, Fidel Martinez-Gutierrez
A biofilm is a very complex consortium formed by a mix of different microorganisms, which have become an important health problem, because its formation is a resistance mechanism used by bacteria against antibiotics or the immune system. In this work, we show differences between some physicochemical properties of biofilms in mono- and multi-species, formed by bacteria from clinical samples of infected chronic wounds. Of the most prevalent bacteria in wounds, two mono- and one multi-species biofilms were developed in vitro by Drip Flow Reactor: one biofilm was developed by S...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29022382/opposing-effect-of-lactobacillus-on-in-vitro-klebsiella-pneumoniae-in-biofilm-and-in-an-in-vivo-intestinal-colonisation-model
#18
R Lagrafeuille, S Miquel, D Balestrino, M Vareille-Delarbre, F Chain, P Langella, C Forestier
Beneficial bacteria represent potential sources of therapy, particularly in the battle against antibiotic-resistant pathogens. The Gram-negative bacillus Klebsiella pneumoniae is not only a paradigm of multi-resistant opportunistic pathogen, but it is also able to colonise the human intestine and displays a high capacity to form biofilm. In this study, the anti-biofilm activity of 140 neutralised Lactobacillus supernatants was assessed against K. pneumoniae. Among the 13 strains whose supernatant significantly impaired biofilm formation, Lactobacillus plantarum CIRM653 was selected because it was also able to impair K...
October 12, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/29018422/novel-aggregation-promoting-factor-agge-contributes-to-the-probiotic-properties-of-enterococcus-faecium-bggo9-28
#19
Katarina Veljović, Nikola Popović, Marija Miljković, Maja Tolinački, Amarela Terzić-Vidojević, Milan Kojić
The understanding of mechanisms of interactions between various bacterial cell surface proteins and host receptors has become imperative for the study of the health promoting features of probiotic enterococci. This study, for the first time, describes a novel enterococcal aggregation protein, AggE, from Enterococcus faecium BGGO9-28, selected from a laboratory collection of enterococcal isolates with auto-aggregation phenotypes. Among them, En. faecium BGGO9-28 showed the strongest auto-aggregation, adhesion to components of ECM and biofilm formation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28986371/genotypic-and-phenotypic-characteristics-in-association-with-biofilm-formation-in-different-pathotypes-of-human-clinical-escherichia-coli-isolates
#20
Juliane Schiebel, Alexander Böhm, Jörg Nitschke, Michał Burdukiewicz, Jörg Weinreich, Aamir Ali, Dirk Roggenbuck, Stefan Rödiger, Peter Schierack
Bacterial biofilm formation is a widespread phenomenon and a complex process requiring a set of genes facilitating the initial adhesion, maturation, production of extracellular polymeric matrix (EPS) and subsequent dispersal of bacteria. Most studies on Escherichia coli (E. coli) biofilm formation have investigated non-pathogenic E. coli K-12 strains. Due to the extensive focus on laboratory strains in most studies, there is poor information regarding biofilm formation by pathogenic E. coli isolates. In this study, we genotypically and phenotypically characterized 187 human clinical E...
October 6, 2017: Applied and Environmental Microbiology
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