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Ronald W Nguema Edzang, The Hy Duong, Jean-François Briand, Marlène Lejars, Jean-Manuel Raimundo, Christine Bressy, Hugues Brisset
Much current research is focused on preventing and controlling the natural process of colonization by marine organisms of surfaces submerged in seawater. Previously, the authors' laboratory has reported the synthesis and the full physico-chemical characterization of homopolymers obtained from 1-ferrocenylmethyl methacrylate (FMMA), 2-(ferrocenylmethoxy)ethyl methacrylate (FMOEMA), and 3-(ferrocenylmethoxy)propyl methacrylate (FMOPMA). Here, the bacterial anti-adhesion activity of these homopolymers (pFMMA, pFMOEMA and pFMOPMA) is reported when stimulated in 96-well microplates containing a printed electrochemical cell in each well...
January 10, 2019: Biofouling
Fatma Neslihan Yüksel, Sencer Buzrul, Mustafa Akçelik, Nefise Akçelik
P22 phage >105 PFU ml-1 could be used to inhibit Salmonella Typhimurium biofilm formation by 55-80%. Concentrations of EDTA >1.25 mM and concentrations of nisin >1,200 µg ml-1 were also highly effective in reducing S. Typhimurium biofilm formation (≥96% and ≥95% reductions were observed, respectively). A synergistic effect was observed when EDTA and nisin were combined whereas P22 phage in combination with nisin had no synergistic impact on biofilm formation. Triple combination of P22 phage, EDTA and nisin could be also used to inhibit biofilm formation (≥93...
January 8, 2019: Biofouling
Sergey Dobretsov, Raeid M M Abed, Thirumahal Muthukrishnan, Priyanka Sathe, Laila Al-Naamani, Bastien Y Queste, Sergey Piontkovski
For the first time, the densities and diversity of microorganisms developed on ocean gliders were investigated using flow cytometry and Illumina MiSeq sequencing of 16S and 18S rRNA genes. Ocean gliders are autonomous buoyancy-driven underwater vehicles, equipped with sensors continuously recording physical, chemical, and biological parameters. Microbial biofilms were investigated on unprotected parts of the glider and surfaces coated with base, biocidal and chitosan paints. Biofilms on the glider were exposed to periodical oscillations of salinity, oxygen, temperature, pressure, depth and light, due to periodic ascending and descending of the vehicle...
January 8, 2019: Biofouling
F Gosselin, L Mathieu, J-C Block, C Carteret, H Muhr, F P A Jorand
Low intensity and very low-frequency electromagnetic fields (EMF) used for preventing scaling in water distribution systems were tested for the first time for their potential impact on drinking water biofilms. The assays were carried out in laboratory-scale flow-through reactors that mimic water distribution systems. The drinking water biofilms were not directly exposed to the core of the EMF generator and only subjected to waterborne electromagnetic waves. The density and chlorine susceptibility of nascent or mature biofilms grown under exposure to EMF were evaluated in soft and hard water...
January 7, 2019: Biofouling
Natalia Jarząb, Maciej Walczak, Dariusz Smoliński, Alina Sionkowska
Materials such as polyvinyl chloride, polypropylene, and polyethylene are used for the construction of medical equipment, including inhalation equipment. Inhalation equipment, because of the wet conditions and good oxygenation, constitutes a perfect environment for microbial biofilm formation. Biofilms may affect microbiological cleanliness of inhalation facilities and installations and promote the development of pathogenic bacteria. Microbial biofilms can form even in saline environments. Therefore, the aim of this study was to evaluate the effect of medicinal brines on microbial biofilm formation on the surfaces of inhalation equipment...
January 6, 2019: Biofouling
Elizabeth A K Murphy, Julio M Barros, Michael P Schultz, Karen A Flack, Cecily N Steppe, Matthew A Reidenbach
Biofilm fouling significantly impacts ship performance. Here, the impact of biofilm on boundary layer structure at a ship-relevant, low Reynolds number was investigated. Boundary layer measurements were performed over slime-fouled plates using high resolution particle image velocimetry (PIV). The velocity profile over the biofilm showed a downward shift in the log-law region (ΔU+ ), resulting in an effective roughness height (ks ) of 8.8 mm, significantly larger than the physical thickness of the biofilm (1...
January 3, 2019: Biofouling
Darby G Brooke, Gunnar Cervin, Olivier Champeau, D Tim Harwood, Henrik Pavia, Andrew I Selwood, Johan Svenson, Louis A Tremblay, Patrick L Cahill
A range of natural products from marine invertebrates, bacteria and fungi have been assessed as leads for nature-inspired antifouling (AF) biocides, but little attention has been paid to microalgal-derived compounds. This study assessed the AF activity of the spirocyclic imine portimine (1), which is produced by the benthic mat-forming dinoflagellate Vulcanodinium rugosum. Portimine displayed potent AF activity in a panel of four macrofouling bioassays (EC50 0.06-62.5 ng ml-1 ), and this activity was distinct from that of the related compounds gymnodimine-A (2), 13-desmethyl spirolide C (3), and pinnatoxin-F (4)...
December 12, 2018: Biofouling
I A Yeginbayeva, M Atlar
There are limited scientific data on contributors to the added drag of in-service ships, represented by modern-day coating roughness and biofouling, either separately or combined. This study aimed to gain an insight into roughness and hydrodynamic performance of typical coatings under in-service conditions of roughened ships' hull surfaces. Comprehensive and systematic experimental data on the boundary layer and drag characteristics of antifouling coating systems with different finishes are presented. The coating types investigated were linear-polishing polymers, foul-release and controlled-depletion polymers...
December 11, 2018: Biofouling
Jiaquan Wang, Zhiyuan Yu, Zimu Xu, Shuheng Hu, Yunxia Li, Xiaojuan Xue, Qiuchen Cai, Xiaoxia Zhou, Jie Shen, Yan Lan, Cheng Cheng
This study systematically assessed the inactivation mechanism on Staphylococcus aureus biofilms by a N2 atmospheric-pressure plasma jet and the effect on the biofilm regeneration capacity from the bacteria which survived, and their progenies. The total bacterial populations were 7.18 ± 0.34 log10 CFU ml-1 in biofilms and these were effectively inactivated (>5.5-log10 CFU ml-1 ) within 30 min of exposure. Meanwhile, >80% of the S. aureus biofilm cells lost their metabolic capacity. In comparison, ∼20% of the plasma-treated bacteria entered a viable but non-culturable state...
November 26, 2018: Biofouling
Fallon Dos Santos Siqueira, Grazielle Guidolin Rossi, Alencar Kolinski Machado, Camilla Filippi Santos Alves, Vanessa Costa Flores, Viviane Drescher Somavilla, Vanessa Albertina Agertt, Josiéli Demetrio Siqueira, Renne de Sousa Dias, Priscila Marquezan Copetti, Michele Rorato Sagrillo, Davi Fernando Back, Marli Matiko Anraku de Campos
Biofilms are considered important sources of infections on biomedical surfaces, and most infections involving biofilm formation are associated with medical device implants. Therefore, there is an urgent need for new antimicrobial compounds that can combat microbial resistance associated with biofilm formation. In this context, this work aimed to evaluate the antibiofilm action of sulfamethoxazole complexed with Au, Cd, Cu, Ni and Hg on rapidly growing mycobacteria (RGM), as well as to evaluate their safety through cytotoxic assays...
November 11, 2018: Biofouling
J Santiago Pozo-Antonio, Patricia Sanmartín
This study evaluated whether exposing samples of granite colonized by a natural biofilm to artificial daylight or UV-A/B/C irradiation for 48 h enhanced removal of the biofilm with a chemical product previously approved for conservation of monuments by the European Biocide Directive. Rodas granite, which is commonly found in stone-built heritage monuments in Galicia (NW Spain), was naturally colonized by a sub-aerial biofilm. The efficacy of the cleaning method was evaluated relative to uncolonized surfaces and colonized control samples without previous irradiation, treated by dry-brushing or with benzalkonium chloride...
November 4, 2018: Biofouling
Kibaek Lee, Jun-Seong Park, Tahir Iqbal, Chang Hyun Nahm, Pyung-Kyu Park, Kwang-Ho Choo
In this study, the seasonality of the biofouling behavior of pilot-scale membrane bioreactors (MBRs) run in parallel with vacant sheets and quorum quenching (QQ) sheets using real municipal wastewater was investigated. QQ media delayed fouling, but low temperatures caused severe biofouling. The greater amount of extracellular polymeric substances (EPSs) produced in cold weather was responsible for the faster biofouling of a membrane, even with QQ media. There were significant negative relationships between EPS levels and water temperature...
October 29, 2018: Biofouling
Luís Roque, Noélia Duarte, Maria Rosário Bronze, Catarina Garcia, Julia Alopaeus, Jesus Molpeceres, Ellen Hagesaether, Ingunn Tho, Patrícia Rijo, Catarina Reis
Glycyrrhiza glabra L. is considered an important source of bioactive compounds. This study aimed at the development of an efficient solution for the treatment of oral candidiasis. Several extracts of Glycyrrhiza glabra L. were prepared using different solvents and their potential in vitro antifungal activity was assessed. Ethanolic extracts showed the most promising results against C. albicans. This extract was incorporated into mucoadhesive nanoparticles (PLA, PLGA and alginate), which were further included in an oral gel, an oral film and a toothpaste, respectively...
October 26, 2018: Biofouling
Allan Guan, Yi Wang, K Scott Phillips
Biological contamination of surfaces in industry and healthcare is an important vector of disease transmission. Current assays for detecting surface-adherent contamination require extraction of biological soil. However, physical inaccessibility or poor solubility may limit recovery. Here, how the o-phthalaldehyde (OPA) protein assay can be modified to measure residual protein (modeled with bovine serum albumin) or biofilm on a surface without extraction is described. The assay limit of detection (LOD) for protein was 1...
October 26, 2018: Biofouling
Jean-Charles Leclerc, Frédérique Viard, Elizabeth González Sepúlveda, Christian Díaz, José Neira Hinojosa, Karla Pérez Araneda, Francisco Silva, Antonio Brante
Growing coastal urbanization together with the intensification of maritime traffic are major processes explaining the increasing rate of biological introductions in marine environments. To investigate the link between international maritime traffic and the establishment of non-indigenous species (NIS) in coastal areas, biofouling communities in three international and three nearby local ports along 100 km of coastline in south-central Chile were compared using settlement panels and rapid assessment surveys...
October 24, 2018: Biofouling
Thaís P Mello, Simone S C Oliveira, Susana Frasés, Marta H Branquinha, André L S Santos
In the present work, some surface properties of the fungi Scedosporium apiospermum, S. aurantiacum, S. minutisporum, and Lomentospora prolificans and their capability to adhere to and form a biofilm on diverse surfaces were evaluated. All four species had high conidial surface hydrophobicity and elevated electronegative zeta potentials. Abundant quantities of melanin were detected at the conidial surface, whereas sialic acid was absent. The numbers of non-germinated and germinated conidia adhered to poly-L-lysine-covered slides was higher than on glass after 4 h of fungi-surface contact...
October 24, 2018: Biofouling
Sawsen Zouaghi, Mikayla E Barry, Séverine Bellayer, Joël Lyskawa, Christophe André, Guillaume Delaplace, Melissa A Grunlan, Maude Jimenez
Pasteurization of dairy products is plagued by fouling, which induces significant economic, environmental and microbiological safety concerns. Herein, an amphiphilic silicone coating was evaluated for its efficacy against fouling by a model dairy fluid in a pilot pasteurizer and against foodborne bacterial adhesion. The coating was formed by modifying an RTV silicone with a PEO-silane amphiphile comprised of a PEO segment and flexible siloxane tether ([(EtO)3 Si-(CH2 )2 -oligodimethylsiloxanem -block-(OCH2 CH2 )n -OCH3 ])...
October 17, 2018: Biofouling
Juzwa Wojciech, Myszka Kamila, Białas Wojciech
In this study a flow based biofilm model system was used to simulate the formation of Pseudomonas aeruginosa biofilms on a stainless steel surface. To investigate the complexity of biofilm-associated P. aeruginosa populations a combination of microscopic observations and flow cytometric analysis (FCM) was adopted. Biofilm-associated P. aeruginosa cells were evaluated (1) under optimal vs reduced nutrient-availability at the initial adhesion stage, and (2) irrespective of nutrient-availability within a mature biofilm...
October 17, 2018: Biofouling
Lijia Huang, Jinfeng Zeng, Caroline Bosch-Tijhof, Junqi Ling, Xi Wei, Cor van Loveren, Wim Crielaard, Dong Mei Deng
This study investigated how the physiological states of Aggregatibacter actinomycetemcomitans (Aa) and Streptococcus mitis affect their intracellular invasion capabilities and the resulting host cell responses. The physiological states included two forms of planktonic states, floating or sedimented (by centrifugation) and the biofilm state (with centrifugation). Confluent epithelial Ca9-22 cells were challenged with floating or sedimented planktonic cultures, or with 24-h biofilms for 3 h. The results show that intracellular invasion efficiencies were clearly affected by the bacterial physiological states...
October 16, 2018: Biofouling
Ester Alves Ferreira Bordini, Caroline Coradi Tonon, Renata Serignoli Francisconi, Fernando Augusto Cintra Magalhães, Patrícia Milagros Maquera Huacho, Telma Lombardo Bedran, Sebastião Pratavieira, Luis Carlos Spolidorio, Denise Palomari Spolidorio
This study evaluated the antibacterial activity of terpinen-4-ol against Streptococcus mutans and Lactobacillus acidophilus and its influence on gbpA (S. mutans) and slpA (L. acidophilus) gene expression. As measured by XTT assay, the concentrations of terpinen-4-ol that effectively inhibited the biofilm were 0.24% and 0.95% for S. mutans and L. acidophilus, respectively. Confocal microscopy revealed the presence of a biofilm attached to the enamel and dentin block surfaces with significant terpinen-4-ol effects against these microorganisms...
October 16, 2018: Biofouling
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