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https://www.readbyqxmd.com/read/28743086/effect-of-cinnamon-cinnamomum-verum-bark-essential-oil-on-the-halitosis-associated-bacterium-solobacterium-moorei-and-in-vitro-cytotoxicity
#1
Geneviève LeBel, Bruno Haas, Andrée-Ann Adam, Marie-Pier Veilleux, Amel Ben Lagha, Daniel Grenier
OBJECTIVES: Halitosis, also known as bad breath or oral malodour, is a condition affecting a large proportion of the population. Solobacterium moorei is a Gram-positive anaerobic bacterium that has been specifically associated with halitosis. In this study, we investigated the effects of essential oils, more particularly cinnamon bark oil, on growth, biofilm formation, eradication and killing, as well as hydrogen sulfide (H2S) production by S. moorei. METHODS: A broth microdilution assay was used to determine the antibacterial activity of essential oils...
July 12, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28741939/the-influence-of-electric-fields-on-biofouling-of-carbonaceous-electrodes
#2
Soumya Pandit, Sneha Shanbhag, Meagan S Mauter, Yoram Oren, Moshe Herzberg
Biofouling commonly occurs on carbonaceous capacitive deionization electrodes in the process of treating natural waters. Although previous work reported the effect of electric fields on bacterial mortality for variety of medical and engineered applications, the effect of electrode surface properties and the magnitude and polarity of applied electric fields on biofilm development has not been comprehensively investigated. This paper studies the formation of Pseudomonas aeruginosa biofilm on Papyex graphite (PA) and carbon aerogel (CA) in presence and absence of an electric field...
July 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28741666/assessment-of-the-potential-of-the-multi-enzyme-producer-bacillus-amyloliquefaciens-us573-as-alternative-feed-additive
#3
Ameny Farhat-Khemakhem, Monia Blibech, Ines Boukhris, Mohamed Makni, Hichem Chouayekh
BACKGROUND: Recently, probiotics have increasingly been used as feed additives in poultry diets as an alternative to antibiotic growth promoters fostering resistance development. RESULTS: This study was aimed at assessing the potential of Bacillus amyloliquefaciens US573 as a direct-fed microbial. The US573 strain was found to be free of harmful enzymatic activities and sensitive to antibiotics. In addition, it showed a good acid and bovine bile tolerance, high adhesion efficacy to chicken enterocytes, and an ability to form biofilms, which may favor its survival and persistence in the animal gastrointestinal tract...
July 25, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28741178/continuum-and-discrete-approach-in-modeling-biofilm-development-and-structure-a-review
#4
M R Mattei, L Frunzo, B D'Acunto, Y Pechaud, F Pirozzi, G Esposito
The scientific community has recognized that almost 99% of the microbial life on earth is represented by biofilms. Considering the impacts of their sessile lifestyle on both natural and human activities, extensive experimental activity has been carried out to understand how biofilms grow and interact with the environment. Many mathematical models have also been developed to simulate and elucidate the main processes characterizing the biofilm growth. Two main mathematical approaches for biomass representation can be distinguished: continuum and discrete...
July 24, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28741172/glass-ionomer-cement-inhibits-secondary-caries-in-an-in-vitro-biofilm-model
#5
Norbert Krämer, Miriam Schmidt, Susanne Lücker, Eugen Domann, Roland Frankenberger
OBJECTIVES: The objective of this study was to investigate the effect of different glass ionomer cements on secondary caries inhibition in a fully automated in vitro biofilm model. MATERIALS AND METHODS: One hundred and twenty-four extracted third molars received class V cavities and were filled with one conventional (Ketac Molar/KM), and two resin-modified glass ionomer cements (Photac Fil/PF, Ketac N100/KN, 3M Espe). A bonded resin composite (Single Bond Plus/Filtek Supreme XTE) served as control...
July 24, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28738548/effect-of-thiosulfate-on-rapid-start-up-of-sulfur-based-reduction-of-high-concentrated-perchlorate-a-study-of-kinetics-extracellular-polymeric-substances-eps-and-bacterial-community-structure
#6
Jianbo Guo, Chao Zhang, Jing Lian, Caicai Lu, Zhi Chen, Yuanyuan Song, Yankai Guo, Yajuan Xing
Perchlorate (ClO4(-)) contamination is more and more concerned due to the hazards to humans. Based on the common primary bacterium (Helicobacteraceae) of both thiosulfate-acclimated sludge (T-Acc) and sulfur-acclimated sludge (S-Acc) for perchlorate reduction, the rapid start-up of sulfur-based perchlorate reduction reactor (SBPRR) was hypothesized by inoculating T-Acc. Furthermore, the performance of SBPRR, the SO4(2-) yield, kinetics of ClO4(-) reduction and the extracellular polymeric substances (EPS) of biofilm confirmed the hypothesis...
July 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738346/synergistic-activity-of-berberine-with-azithromycin-against-pseudomonas-aeruginosa-isolated-from-patients-with-cystic-fibrosis-of-lung-in-vitro-and-in-vivo
#7
YongTao Li, JianRong Huang, LanJuan Li, LinSheng Liu
BACKGROUND/AIMS: Pseudomonas aeruginosa (PA) is one of the major opportunistic pathogens which can cause chronic lung infection of cystic fibrosis (CF). The formation of PA biofilm promotes CF development and restricts the antimicrobial efficacies of current antibiotics. METHODS: The antimicrobial effects of azithromycin (AZM) and berberine (BER) alone and in combination were evaluated using microdilution method, checkerboard assay, time-kill test, qRT-PCR analysis and absorption method...
July 24, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28738195/proteomic-and-genetics-insights-on-the-response-of-the-bacteriocinogenic-lactobacillus-sakei-crl1862-during-biofilm-formation-on-stainless-steel-surface-at-10%C3%A2-c
#8
Mariana Pérez-Ibarreche, Lucía M Mendoza, Graciela Vignolo, Silvina Fadda
Some lactic acid bacteria have the ability to form biofilms on food-industry surfaces and this property could be used to control food pathogens colonization. Lactobacillus sakei CR1862 was selected considering its bacteriocinogenic nature and ability to adhere to abiotic surfaces at low temperatures. In this study, the proteome of L. sakei CRL1862 grown either under biofilm on stainless steel surface and planktonic modes of growth at 10°C, was investigated. Using two-dimensional gel electrophoresis, 29 out of 43 statistically significant spots were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry...
July 4, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28738143/sustained-high-nutrient-supply-as-an-allelopathic-trigger-between-periphytic-biofilm-and-microcystis-aeruginosa
#9
Yonghong Wu, Jun Tang, Junzhuo Liu, Bruce Graham, Philip G Kerr, Hong Chen
Allelopathy among aquatic organisms, especially microorganisms, has received growing attention in recent years for its role in shaping interactions with bloom-forming algae. Many studies have shown that allelopathy occurs and increases under nutrient limiting conditons. However, to date there is no reported direct evidence to indicate allelopathy occurs under the condition of constant high nutrient supply. Here we report the allelopathic action of periphytic biofilm on bloom-forming cyanobacteria (Microcystis aeruginosa), which was triggered by the stress of high nutrient conditions, and continues while nutrients are sustained at high levels (trophic state index at 159 and 171)...
July 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28737897/biogenic-hydroxyapatite-a-new-material-for-the-preservation-and-restoration-of-the-built-environment
#10
Ronald Joseph Turner, Joanna C Renshaw, Andrea Hamilton
Ordinary Portland Cement (OPC) is by weight the world's most produced man-made material, and consequently is used in a variety of applications in environments ranging from buildings, to nuclear wasteforms, and within the human body. In this paper, we present for the first time the direct deposition of biogenic hydroxyapatite onto the surface of OPC, in a synergistic process which relies upon the unique properties of the cement substrate. The synthesised hydroxyapatite is very similar to that found in nature; having a crystallite size, iron and carbonate substitution, and a semi-crystalline structure which identify that this biogenic hydroxyapatite is akin to that found in natural bone and tooth enamel...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737725/optimization-of-the-silver-nanoparticles-peald-process-on-the-surface-of-1-d-titania-coatings
#11
Aleksandra Radtke, Tomasz Jędrzejewski, Wiesław Kozak, Beata Sadowska, Marzena Więckowska-Szakiel, Ewa Talik, Maarit Mäkelä, Markku Leskelä, Piotr Piszczek
Plasma enhanced atomic layer deposition (PEALD) of silver nanoparticles on the surface of 1-D titania coatings, such as nanotubes (TNT) and nanoneedles (TNN), has been carried out. The formation of TNT and TNN layers enriched with dispersed silver particles of strictly defined sizes and the estimation of their bioactivity was the aim of our investigations. The structure and the morphology of produced materials were determined using X-ray photoelectron spectroscopy (XPS) and scanning electron miscroscopy (SEM)...
July 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28737700/a-novel-brominated-alkaloid-securidine-a-isolated-from-the-marine-bryozoan-securiflustra-securifrons
#12
Priyanka Michael, Kine Ø Hansen, Johan Isaksson, Jeanette H Andersen, Espen Hansen
A novel brominated alkaloid, Securidine A, was isolated from the cold water marine bryozoan Securiflustra securifrons. Securidine A was isolated using semi-preparative HPLC, and the structure was elucidated by spectroscopic methods. The isolated Securidine A was tested for cytotoxic, antibacterial, and anti-diabetic activities as well as for its potential for inhibition of biofilm formation. No significant biological activity was observed in the applied bioassays, thus expanded bioactivity profiling is required, in order to reveal any potential applications for Securidine A...
July 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28737690/synthesis-physico-chemical-characterization-crystal-structure-and-influence-on-microbial-and-tumor-cells-of-some-co-ii-complexes-with-5-7-dimethyl-1-2-4-triazolo-1-5-a-pyrimidine
#13
Luminiţa Măruţescu, Larisa Calu, Mariana Carmen Chifiriuc, Coralia Bleotu, Constantin-Gabriel Daniliuc, Denisa Fălcescu, Crina Maria Kamerzan, Mihaela Badea, Rodica Olar
Three complexes, namely [Co(dmtp)₂(OH₂)₄][CoCl₄] (1), [Co(dmtp)₂Cl₂] (2) and [Co(dmtp)₂(OH₂)₄]Cl₂∙2H₂O (3) (dmtp: 5,7-dimethyl-1,2,4-triazolo[1,5-a]pyrimidine), were synthesized and characterized by spectral (IR, UV-Vis-NIR), and magnetic measurements at room temperature, as well as single crystal X-ray diffraction. Complex (1) crystallizes in monoclinic system (space group C2/c), complex (2) adopts an orthorhombic system (space group Pbca), and complex (3) crystallizes in triclinic system (space group P1)...
July 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28737385/a-synthetic-circuit-for-mercury-bioremediation-using-self-assembling-functional-amyloids
#14
Pei Kun Richie Tay, Peter Q Nguyen, Neel S Joshi
Synthetic biology approaches to bioremediation are a key sustainable strategy to leverage the self-replicating and programmable aspects of biology for environmental stewardship. The increasing spread of anthropogenic mercury pollution into our habitats and food chains is a pressing concern. Here, we explore the use of programmed bacterial biofilms to aid in the sequestration of mercury. We demonstrate that by integrating a mercury-responsive promoter and an operon encoding a mercury-absorbing self-assembling extracellular protein nanofiber, we can engineer bacteria that can detect and sequester toxic Hg2+ ions from the environment...
July 24, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28736916/hyaluronate-effect-on-bacterial-biofilm-in-ent-district-infections-a-review
#15
REVIEW
Alberto Vito Marcuzzo, Margherita Tofanelli, Francesca Boscolo Nata, Annalisa Gatto, Giancarlo Tirelli
Bacterial resistance is a growing phenomenon which led the scientific community to search for new therapeutic targets, such as biofilm. A bacterial biofilm is a surface-associated agglomerate of microorganisms embedded in a self-produced extracellular polymeric matrix made of polysaccharides, nucleic acids, and proteins. Scientific literature offers several reports on a biofilm's role in infections regarding various body districts. The presence of a bacterial biofilm is responsible for poor efficacy of antibiotic therapies along with bacterial infections in ear, nose, and throat (ENT) districts such as the oral cavity, ear, nasal cavities, and nasal sinuses...
July 24, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28736865/bioprotection-of-the-built-environment-and-cultural-heritage
#16
Geoffrey Michael Gadd, Thomas D Dyer
The growth of microbial biofilms and various biomineralization phenomena can lead to the formation of stable layers and veneers on rocks known as 'rock varnishes' that can stabilize surfaces and protect from further weathering. This article describes the potential application of fungal systems for bioprotection of rock and mineral-based substrates and the evidence to support this concept of utilizing natural or engineered colonization and metabolic properties of fungi, including lichens.
July 24, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28736523/sub-minimum-inhibitory-concentrations-of-rhubarb-water-extracts-inhibit-streptococcus-suis-biofilm-formation
#17
Wen-Ya Ding, Yan-Hua Li, He Lian, Xiao-Yu Ai, Yu-Lin Zhao, Yan-Bei Yang, Qiang Han, Xin Liu, Xue-Ying Chen, Zhonggui He
Streptococcus suis is one of the most important swine pathogens, which can cause persistent infection by forming biofilms. In this study, sub-minimum inhibitory concentration (sub-MIC) of rhubarb water extracts were found to inhibit biofilm formation. Two-component signal transduction systems (TCSs), transcriptional regulators, and DNA binding proteins were compared under two conditions: (1) cells treated with sub-MIC rhubarb water extracts and (2) untreated cells. Using an isobaric tags for relative and absolute quantitation (iTRAQ) strategy, we found that TCSs constituent proteins of histidine kinase and response regulator were significantly down-regulated...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28736072/antibacterial-activities-of-natural-lichen-compounds-against-streptococcus-gordonii-and-porphyromonas-gingivalis
#18
Alaa Sweidan, Marylene Chollet-Krugler, Aurelie Sauvager, Pierre van de Weghe, Ali Chokr, Martine Bonnaure-Mallet, Sophie Tomasi, Latifa Bousarghin
The oral bacteria not only infect the mouth and reside there, but also travel through the blood and reach distant body organs. If left untreated, the dental biofilm that can cause destructive inflammation in the oral cavity may result in serious medical complications. In dental biofilm, Streptococcus gordonii, a primary oral colonizer, constitutes the platform on which late pathogenic colonizers like Porphyromonas gingivalis, the causative agent of periodontal diseases, will bind. The aim of this study was to determine the antibacterial activity of eleven natural lichen compounds belonging to different chemical families and spanning from linear into cyclic and aromatic structures to uncover new antibiotics which can fight against the oral bacteria...
July 20, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28735852/roles-of-quorum-sensing-molecules-from-rhizobium-etli-rt1-in-bacterial-motility-and-biofilm-formation
#19
Swarnita Dixit, Ramesh Chand Dubey, Dinesh Kumar Maheshwari, Prahlad Kishore Seth, Vivek K Bajpai
Strain RT1 was isolated from root nodules of Lens culinaris (a lentil) and characterized as Rhizobium etli (a Gram-negative soil-borne bacterium) by 16S rDNA sequencing and phylogenetic analysis. The signaling molecules produced by R. etli (RT1) were detected and identified by high-performance liquid chromatography coupled with mass spectrometry. The most abundant and biologically active N-acyl homoserine lactone molecules (3-oxo-C8-HSL and 3-OH-C14-HSL) were detected in the ethyl acetate extract of RT1. The biological role of 3-oxo-C8-HSL was evaluated in RT1...
July 8, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28735329/antistaphylococcal-activity-of-selected-thiourea-derivatives
#20
Joanna Stefańska, Karolina Stępień, Anna Bielenica, Małgorzata Wrzosek, Marta Struga
Five of thiourea derivatives were prepared using as a starting compound 3-(trifluoromethyl)aniline, 4-chloro-3-nitroaniline, 1,3-thiazol-2-amine, 2H-1,2,3-triazol-4-amine and commercial isothiocyanates. All compounds were evaluated in vitro for antimicrobial activity. Derivatives 2 and 3 showed the highest inhibition against Gram-positive cocci (standard and hospital strains). The observed MIC values were in the range of 0.5-8 μg/ml. The products effectively inhibited the formation of biofilms of methicillin-resistant and standard strains of Staphylococcus epidermidis...
January 2, 2017: Polish Journal of Microbiology
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