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https://www.readbyqxmd.com/read/28813778/the-bactericidal-effect-of-high-temperature-is-an-essential-resistance-mechanism-of-chicken-macrophage-against-brucella-abortus-infection
#1
Lauren Togonon Arayan, Alisha Wehdnesday Bernardo Reyes, Huynh Tan Hop, Huy Tran Xuan, Eun Jin Baek, Wongi Min, Suk Kim
Knowledge of avian host responses to brucellosis is critical to understanding how avian resists this infection however this mechanism is not well established. On the other hand, temperature has a major involvement in the physiology of living organisms and cell death induced by heat is attributed to protein denaturation. This study demonstrates the direct bactericidal effect of a higher temperature (41ºC) to Brucella (B.) abortus that resulted in the gradual reduction of intracellular bacteria that inhibits bacterial growth within avian macrophage HD11 along an increasing period of time...
August 17, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28813014/antibacterial-properties-of-nonwoven-wound-dressings-coated-with-manuka-honey-or-methylglyoxal
#2
Sophie E L Bulman, Giuseppe Tronci, Parikshit Goswami, Chris Carr, Stephen J Russell
Manuka honey (MH) is used as an antibacterial agent in bioactive wound dressings via direct impregnation onto a suitable substrate. MH provides unique antibacterial activity when compared with conventional honeys, owing partly to one of its constituents, methylglyoxal (MGO). Aiming to investigate an antibiotic-free antimicrobial strategy, we studied the antibacterial activity of both MH and MGO (at equivalent MGO concentrations) when applied as a physical coating to a nonwoven fabric wound dressing. When physically coated on to a cellulosic hydroentangled nonwoven fabric, it was found that concentrations of 0...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28810193/kinetics-and-mechanism-of-antibacterial-activity-and-cytotoxicity-of-ag-rgo-nanocomposite
#3
Marjan Moghayedi, Elaheh K Goharshadi, Kiarash Ghazvini, Hossein Ahmadzadeh, Laleh Ranjbaran, Raheleh Masoudi, Ralf Ludwig
Nowadays, nanomaterials with remarkable antibacterial activity and low cytotoxicity attract much interest in research. By considering the antibacterial activity of Ag and graphene oxide (GO), the Ag-RGO nanocomposite was prepared by a one-pot and facile technique and it was used to evaluate its antibacterial activity and cytotoxicity against Escherichia coli and glioblastoma cancer cells (U87MG), respectively. The antibacterial activity was studied by micro-dilution and colony counting methods to investigate cell viability...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28809095/isocyanate-free-uv-crosslinked-poly-hydroxyurethane-networks-a-sustainable-approach-toward-highly-functional-antibacterial-gels
#4
Geng Hua, Karin Odelius
An increased sustainabile awarness has inspired the development of new polymeric networks in a remarkable way and this strive should be combined with environmentally concerned end-uses. Therefore, a UV-crosslinked polyhydroxyurethane film with antibacterial properties is developed. First, a hydroxyurethane precursor is synthesized using aminolysis condensation, circumventing the use of isocyanates. The films are subsequently crosslinked under solvent-free conditions through a UV-triggered thiol-ene mechanism...
August 15, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28808398/mechanism-of-action-of-isolated-caffeic-acid-and-epicatechin-3-gallate-from-euphorbia-hirta-against-pseudomonas-aeruginosa
#5
Shanmugapriya Perumal, Roziahanim Mahmud, Sabariah Ismail
BACKGROUND: The escalating dominance of resistant Pseudomonas aeruginosa strains as infectious pathogen had urged the researchers to look for alternative and complementary drugs. OBJECTIVE: The objective of this study is to address the biological targets and probable mechanisms of action underlying the potent antibacterial effect of the isolated compounds from Euphorbia hirta (L.) against P. aeruginosa. MATERIALS AND METHODS: The action mechanisms of caffeic acid (CA) and epicatechin 3-gallate (ECG) on P...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28808376/isolation-of-abscisic-acid-from-korean-acacia-honey-with-anti-helicobacter-pylori-activity
#6
SeGun Kim, InPyo Hong, SoonOk Woo, HyeRi Jang, SokCheon Pak, SangMi Han
BACKGROUND: Helicobacter pylori (H. pylori) is linked to the development of the majority of peptic ulcers and some types of gastric cancers, and its antibiotic resistance is currently found worldwide. OBJECTIVE: This study is aimed at evaluating the anti-H. pylori activity of Korean acacia honey and isolating the related active components using organic solvents. MATERIAL AND METHODS: The crude acacia honey was extracted with n-hexane, dichloromethane, ethyl acetate (EtOAc), and n-butanol...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28807880/-broad-spectrum-bactericidal-activity-of-a-new-bioactive-grafting-material-f18-against-clinically-important-bacterial-strains
#7
M T Souza, L A Campanini, C R Chinaglia, O Peitl, E D Zanotto, C W O Souza
Infection is the most relevant surgical complication in implant or grafting procedures. Osteomyelitis and other chronic conditions pose a constant challenge in the current practice of medicine. In this context, a grafting biomaterial that possesses antibacterial properties combined with bioactivity could have great clinical impact. Researchers at the Vitreous Materials Laboratory (LaMaV-UFSCar) recently developed a glass composition, F18, which presents an improved workability range combined with high bioactivity...
August 11, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28805055/ph-induced-switchable-superwettability-of-efficient-antibacterial-fabrics-for-durable-selective-oil-water-separation
#8
Yuchen Fu, Biyu Jin, Qinghua Zhang, Xiaoli Zhan, Fengqiu Chen
The superhydrophobic antibacterial fabrics with intelligent switchable wettability were fabricated by the crosslink reaction among pH-responsive antibacterial copolymer tethered hydroxyl groups, methylol-contained poly(ureaformaldehyde) nanoparticles (PUF NPs) and hexamethylene diisocyanate. It was found that the surface concentration of N+ were heavily influenced by acid solutions, resulting in the rapid wettability conversion from superhydrophobicity/superoleophilicity to superhydrophilicity/underwater superoleophobicity in remarkably short time...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805046/electroenhanced-antimicrobial-coating-based-on-conjugated-polymers-with-covalently-coupled-silver-nanoparticles-prevents-staphylococcus-aureus-biofilm-formation
#9
Salvador Gomez-Carretero, Rolf Nybom, Agneta Richter-Dahlfors
The incidence of hospital-acquired infections is to a large extent due to device-associated infections. Bacterial attachment and biofilm formation on surfaces of medical devices often act as seeding points of infection. To prevent such infections, coatings based on silver nanoparticles (AgNPs) are often applied, however with varying clinical success. Here, the traditional AgNP-based antibacterial technology is reimagined, now forming the base for an electroenhanced antimicrobial coating. To integrate AgNPs in an electrically conducting polymer layer, a simple, yet effective chemical strategy based on poly(hydroxymethyl 3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT-MeOH:PSS) and (3-aminopropyl)triethoxysilane is designed...
August 14, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28803730/renal-sodium-gradient-orchestrates-a-dynamic-antibacterial-defense-zone
#10
Miriam R Berry, Rebeccah J Mathews, John R Ferdinand, Chenzhi Jing, Kevin W Loudon, Elizabeth Wlodek, Thomas W Dennison, Christoph Kuper, Wolfgang Neuhofer, Menna R Clatworthy
Lower urinary tract infections are among the most common human bacterial infections, but extension to the kidneys is rare. This has been attributed to mechanical forces, such as urine flow, that prevent the ascent of bladder microbes. Here, we show that the regional hypersalinity, required for the kidney's urine-concentrating function, instructs epithelial cells to produce chemokines that localize monocyte-derived mononuclear phagocytes (MNPs) to the medulla. This hypersaline environment also increases the intrinsic bactericidal and neutrophil chemotactic activities of MNPs to generate a zone of defense...
August 8, 2017: Cell
https://www.readbyqxmd.com/read/28803607/effects-of-scutellaria-baicalensis-on-activity-and-biofilm-formation-of-klebsiella-pneumoniae
#11
Wei Chen, Bei Li, Shuai Li, Yi-Wen Ou, Qin Ou
Objective To explore the effects of Scutellaria baicalensis on activity and biofilm formation of Klebsiella pneumonia (Kp).Methods The broth and agar dilution Methods were carried out to determine minimum inhibitory concentration and minimum bactericidal concentration of Scutellaria baicalensis for TW518. VITEK-32 system was used to assay TW518 susceptibility to antibiotics. Kp biofilms were formed in vitro and stained with BacLight Live/Dead stain. The class integron geneⅠ1 mRNA expression was analyzed with RT-PCR...
September 20, 2016: Chinese Medical Sciences Journal, Chung-kuo i Hsüeh K'o Hsüeh Tsa Chih
https://www.readbyqxmd.com/read/28802737/multi-biofunctional-polymer-graphene-composite-for-bone-tissue-regeneration-that-elutes-copper-ions-to-impart-angiogenic-osteogenic-and-bactericidal-properties
#12
L R Jaidev, Sachin Kumar, Kaushik Chatterjee
Despite several recent advances, poor vascularization in implanted scaffolds impedes complete regeneration for clinical success of bone tissue engineering. The present study aims to develop a multi-biofunctional nanocomposite for bone tissue regeneration using copper nanoparticle decorated reduced graphene oxide (RGO_Cu) hybrid particles in polycaprolactone (PCL) matrix (PCL/RGO_Cu). X-ray photoelectron spectroscopy and X-ray diffraction confirmed the presence of copper oxides (CuO and Cu2O) on RGO. Thermogravimetric analysis showed that 11...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28802697/the-insertion-of-polybia-mp1-into-phospholipid-monolayers-is-regulated-by-its-anionic-nature-and-phase-state
#13
Dayane S Alvares, Natalia Wilke, João Ruggiero Neto, Maria Laura Fanani
Polybia-MP1 or simply MP1 (IDWKKLLDAAKQIL-NH2) is a peptide with broad-spectrum bactericidal activity and a strong inhibitory effect against cancer cells. The aim of this work was to evaluate the effect of biophysical properties such as membrane texture and film thickness on MP1 interaction with neutral and anionic lipid membranes. For this purpose, we first explored the peptide's surface behavior. MP1 showed high surface activity, adsorbing onto bare air/aqueous interfaces up to higher surface pressures than the collapse pressure of MP1 Langmuir films...
August 9, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28802072/fifty-years-of-benz-oxaphospholene-chemistry
#14
Jan Berton, Thomas Heugebaert, David Virieux, Chris Victor Stevens
The first synthesis of benzoxaphospholenes dates back to the 60s. Since then, the structural variety of reported (benz)oxaphospholenes has steadily increased. Organophosphorus compounds have caught the interest of synthetic chemists for a couple of decades now because of their interesting biological properties. Oxaphospholenes, in particular, could serve as carbohydrate mimetics, while benzoxaphospholenes have been reported to possess bactericidal, insecticidal, herbicidal and fungistatical properties. Transesterification reactions and addition of phosphorus nucleophiles to carbonyl compounds were reaction types that led to the production of the first (benz)oxaphospholenes...
August 12, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28801581/bpifcl-modulates-kiss2-expression-under-the-influence-of-11-ketotestosterone-in-female-zebrafish
#15
Shogo Moriya, Nabila Tahsin, Ishwar S Parhar
The bactericidal/permeability-increasing (BPI) fold-containing (BPIF) superfamily of genes expressed in the brain are purportedly involved in modulating brain function in response to stress, such as inflammation. Kisspeptin, encoded by kiss, is affected by inflammation in the brain; therefore, BPIF family genes might be involved in the modulation of kisspeptin in the brain. In this study, we investigated the expression of BPIF family C, like (bpifcl) in zebrafish brain and its involvement in kiss2 regulation...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800829/combination-of-endolysins-and-high-pressure-to-inactivate-listeria-monocytogenes
#16
Tomas J van Nassau, Christian A Lenz, Anna S Scherzinger, Rudi F Vogel
Outbreaks of listeriosis are often related to the consumption of low-processed ready-to-eat food products (e.g. soft cheeses or smoked fish) contaminated with Listeria monocytogenes. Traditional preservation techniques, such as heat treatment, cannot eliminate Listeria from these products without strongly affecting the quality of the foods. We therefore investigated the use of endolysin (PlyP40, Ply511, or PlyP825) in combination with high hydrostatic pressure processing to kill L. monocytogenes in buffer...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28800818/characterization-of-a-novel-endolysin-lyssa11-and-its-utility-as-a-potent-biocontrol-agent-against-staphylococcus-aureus-on-food-and-utensils
#17
Yoonjee Chang, Minsik Kim, Sangryeol Ryu
Here we show that the LysSA11 endolysin, derived from the virulent Staphylococcus aureus phage SA11, has lytic activity against staphylococcal strains. Bioinformatics analysis revealed an enzymatically active CHAP (cysteine, histidine-dependent amidohydrolases/peptidases) domain at the N-terminus of LysSA11 that showed amidase activity. A novel cell wall binding domain (CBD) in the C-terminus could bind to a broad spectrum of staphylococcal cells. The bactericidal activity of LysSA11 was determined in food and utensils artificially contaminated with methicillin-resistant S...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28799789/naphtho-1-2-b-furan-4-5-dione-is-a-potent-anti-mrsa-agent-against-planktonic-biofilm-and-intracellular-bacteria
#18
Shih-Chun Yang, Feng-Lin Yen, Pei-Wen Wang, Ibrahim A Aljuffali, Yi-Han Weng, Chih-Hua Tseng, Jia-You Fang
AIM: Naphtho[1,2-b]furan-4,5-dione (N12D) and naphtho[2,3-b]furan-4,9-dione (N23D) are furanonaphthoquinone derivatives from natural resources. We examined the antimicrobial activity of N12D and N23D against drug-resistant Staphylococcus aureus. MATERIALS & METHODS: Minimum inhibitory concentration, minimum bactericidal concentration, bacterial viability and agar diffusion assay were conducted against methicillin-resistant S. aureus (MRSA) and clinical isolates of vancomycin-resistant S...
August 11, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28799744/influence-of-superhydrophobicity-on-the-bactericidal-efficiency-of-black-silicon-surfaces
#19
Denver Paige Linklater, Saulius Juodkazis, Sergey Rubanov, Elena P Ivanova
The recent discovery of nanostructured surfaces induced rupturing of bacterial cells has seen a surge in the development of surfaces for the physical killing of bacteria towards the fight against bacterial colonisation of abiotic surfaces. It is established that the nanoarchitecture is directly responsible for the inactivation of bacterial cells; however the mechanobactericidal action remains to be fully elucidated. Here we report the fabrication of superhydrophilic and superhydrophobic black silicon surfaces with well-defined surface geometries and wettability which are responsible for inactivating approximately 98% of P...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28799523/bactericidal-activity-of-the-ti-13nb-13zr-alloy-against-different-species-of-bacteria-related-with-implant-infection
#20
John-Jairo Aguilera-Correa, Ana Conde, Maria-Angeles Arenas, Juan-Jose de-Damborenea, Miguel Marin, Antonio L Doadrio, Jaime Esteban
The Ti-6Al-4V alloy is one of the most commonly used in orthopedic surgery. Despite its advantages, there is an increasing need to use new titanium alloys with no toxic elements and improved biomechanical properties, such as Ti-13Nb-13Zr. Prosthetic joint infections (PJI) are mainly caused by Gram-positive bacteria; however, Gram-negative bacteria are a growing problem due to associated multidrug resistance. In this study, the bacterial adherence and viability on the Ti-13Nb-13Zr alloy have been compared to that of the Ti-6Al-4V alloy using 16 collection and clinical strains of bacterial species related to PJI: Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, and Pseudomonas aeruginosa...
August 11, 2017: Biomedical Materials
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