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https://www.readbyqxmd.com/read/28633850/stabilization-of-nano-structured-zno-particles-onto-the-surface-of-cotton-fibers-using-different-surfactants-and-their-antimicrobial-activity
#1
Issa M El-Nahhal, Abdelraouf A Elmanama, Nizam M El Ashgar, Nadia Amara, Mohamed Selmane, Mohamed M Chehimi
ZnO NPs were prepared and deposited onto cotton fibers via ultrasound irradiation successfully. Different surfactants (SDS, HY, CTAB, TX-100) have been used to stabilize, homogenize the coated ZnO NPs and control their shape and size as encapsulated species. The use of surfactants has improved the durability of ZnO NPs and decreased its leaching in particular SDS. The small mean crystallite size for ZnO particles due to the use of surfactants is the main reason for decreasing the leached of ZnO particles from cotton substrate...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28630685/effectiveness-of-surface-coatings-containing-silver-ions-in-bacterial-decontamination-in-a-recovery-unit
#2
Rafael Manuel Ortí-Lucas, Julio Muñoz-Miguel
BACKGROUND: HAIs remain a frequent complication for hospitalised patients and pose a challenge that must be tackled by our health systems. METHODS: Quasi-experimental study. In order to determine the antimicrobial effectiveness of surface coating agents containing silver ions (BactiBlock®) the degree of contamination of several surfaces in two ICU wards was compared. The association between application of Bactiblock® and surface contamination was analysed using a relative risk (RR)...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28618218/citrate-coated-silver-nanoparticles-growth-independently-inhibit-aflatoxin-synthesis-in-aspergillus-parasiticus
#3
Chandrani Mitra, Phani M Gummadidala, Kamelia Afshinnia, Ruth Corrin Merrifield, Mohammed A Baalousha, Jamie R Lead, Anindya Chanda
Manufactured silver nanoparticles (Ag NPs) have long been used as antimicrobials. However, little is known about how these NPs affect fungal cell functions. While multiple previous studies reveal that Ag NPs inhibit secondary metabolite syntheses in several mycotoxin producing filamentous fungi, these effects are associated with growth repression and hence need sub-lethal to lethal NP doses, which besides stopping fungal growth, can potentially accumulate in the environment. Here we demonstrate that citrate coated Ag NPs of size 20 nm, when applied at a selected nonlethal dose, can result in a > 2 fold inhibition of biosynthesis of the carcinogenic mycotoxin and secondary metabolite, aflatoxin B1 in the filamentous fungus and an important plant pathogen, Aspergillus parasiticus, without inhibiting fungal growth...
June 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28617605/arginine-based-polymer-brush-coatings-with-hydrolysis-triggered-switchable-functionalities-from-antimicrobial-cationic-to-antifouling-zwitterionic
#4
Gang Xu, Xianneng Liu, Peng Liu, Dicky Pranantyo, Koon Gee Neoh, En-Tang Kang
Arginine polymer-based coatings with switchable properties were developed on the glass slides (GS) to demonstrate the smart transition from antimicrobial (cationic) to fouling-resistant (zwitterionic) surfaces. L-arginine methyl ester-methacryloylamide (Arg-Est) and L-arginine-methacryloylamide (Arg-Me) polymer brushes were grafted from the GS surface via surface-initiated reversible addition-fragmentation chain-transfer (SI-RAFT) polymerization. In comparison to the pristine GS and Arg-Me graft polymerized GS (GS-Arg-Me) surfaces, the Arg-Est polymer brushes-functionalized GS surfaces exhibit a superior antimicrobial activity...
June 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28614735/enhanced-biomimic-bactericidal-surfaces-by-coating-with-positively-charged-zif-nano-dagger-arrays
#5
Yuan Yuan, Yugen Zhang
Cicada wing surfaces are covered with dense patterns of nano-pillar structure that prevent bacterial growth by rupturing adhered microbial cells. To mimic the natural nano-pillar structure, we developed a general and simple method to grow metal organic framework (MOF) nano-dagger arrays on a wide range of surfaces. These nano-daggers possess high bactericidal activity, with log reduction >7 for Escherichia coli and Staphylococcus aureus. It was hypothesized that the positively-charged ZIF-L nano-dagger surfaces enhance bacterial cell adhesion, facilitating selective and efficient bacteria killing by the rigid and sharp nano-dagger tips...
June 11, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28613299/cellulose-gold-nanoparticle-hybrid-materials
#6
REVIEW
Jonas Van Rie, Wim Thielemans
Cellulose and gold nanoparticles have exciting characteristics and new combinations of both materials may lead to promising functional nanocomposites with unique properties. We have reviewed current research on cellulose-gold nanoparticle composite materials, and we present an overview of the preparation methods of cellulose-gold composite materials and discuss their applications. We start with the nanocomposite fabrication methods, covering in situ gold reduction, blending, and dip-coating methods to prepare gold-cellulose nanocomposite hybrids...
June 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28609707/antibacterial-properties-of-sophorolipid-modified-gold-surfaces-against-gram-positive-and-gram-negative-pathogens
#7
Claire Valotteau, Ibrahim M Banat, Christopher A Mitchell, Helen Lydon, Roger Marchant, Florence Babonneau, Claire-Marie Pradier, Niki Baccile, Vincent Humblot
Sophorolipids are bioderived glycolipids displaying interesting antimicrobial properties. We show that they can be used to develop biocidal monolayers against Listeria ivanovii, a Gram-positive bacterium. The present work points out the dependence between the surface density and the antibacterial activity of grafted sophorolipids. It also emphasizes the broad spectrum of activity of these coatings, demonstrating their potential against both Gram-positive strains (Enteroccocus faecalis, Staphylococcus epidermidis, Streptococcus pyogenes) and Gram-negative strains (Escherichia coli, Pseudomonas aeruginosa and Salmonella typhymurium)...
June 2, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28605359/production-of-metal-nanoparticles-by-pulsed-laser-ablation-in-liquids-a-tool-for-studying-the-antibacterial-properties-of-nanoparticles
#8
Matthew Ratti, Joseph J Naddeo, Julianne C Griepenburg, Sean M O'Malley, Daniel M Bubb, Eric A Klein
The emergence of multidrug-resistant bacteria is a global clinical concern leading some to speculate about our return to a "pre-antibiotics" era of medicine. In addition to efforts to identify novel small-molecule antimicrobial drugs, there has been great interest in the use of metal nanoparticles as coatings for medical devices, wound dressings, and consumer packaging, due to their antimicrobial properties. The wide variety of methods available for nanoparticle synthesis results in a broad spectrum of chemical and physical properties which can affect antibacterial efficacy...
June 2, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28604660/1-003-reference-genomes-of-bacterial-and-archaeal-isolates-expand-coverage-of-the-tree-of-life
#9
Supratim Mukherjee, Rekha Seshadri, Neha J Varghese, Emiley A Eloe-Fadrosh, Jan P Meier-Kolthoff, Markus Göker, R Cameron Coates, Michalis Hadjithomas, Georgios A Pavlopoulos, David Paez-Espino, Yasuo Yoshikuni, Axel Visel, William B Whitman, George M Garrity, Jonathan A Eisen, Philip Hugenholtz, Amrita Pati, Natalia N Ivanova, Tanja Woyke, Hans-Peter Klenk, Nikos C Kyrpides
We present 1,003 reference genomes that were sequenced as part of the Genomic Encyclopedia of Bacteria and Archaea (GEBA) initiative, selected to maximize sequence coverage of phylogenetic space. These genomes double the number of existing type strains and expand their overall phylogenetic diversity by 25%. Comparative analyses with previously available finished and draft genomes reveal a 10.5% increase in novel protein families as a function of phylogenetic diversity. The GEBA genomes recruit 25 million previously unassigned metagenomic proteins from 4,650 samples, improving their phylogenetic and functional interpretation...
June 12, 2017: Nature Biotechnology
https://www.readbyqxmd.com/read/28600938/highly-synergistic-antimicrobial-activity-of-spherical-and-flower-like-hierarchical-titanium-dioxide-silver-composites
#10
Junwei Ye, Hang Cheng, Hong Li, Yaoyao Yang, Siqi Zhang, Abdul Rauf, Qi Zhao, Guiling Ning
A spherical titanium dioxide/silver (TiO2/Ag) composite and a flower-like hierarchical TiO2/Ag composite were prepared via a template-induced method and a solvothermal method based on the Ag/Carbon spheres templates followed by calcination treatment, respectively. The morphologies of the composites were controlled by changing the concentration of reactants and calcination temperature. The antibacterial efficiency of the composites was evaluated with both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus, respectively...
May 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28599578/antimicrobial-and-bone-forming-activity-of-a-copper-coated-implant-in-a-rabbit-model
#11
Cornelia Prinz, Mohamed Elhensheri, Joachim Rychly, Hans-Georg Neumann
Current strategies in implant technology are directed to generate bioactive implants that are capable to activate the regenerative potential of the surrounding tissue. On the other hand, implant-related infections are a common problem in orthopaedic trauma patients. To meet both challenges, i.e. to generate a bone implant with regenerative and antimicrobial characteristics, we tested the use of copper coated nails for surgical fixation in a rabbit model. Copper acetate was galvanically deposited with a copper load of 1 µg/mm(2) onto a porous oxide layer of Ti6Al4V nails, which were used for the fixation of a tibia fracture, inoculated with bacteria...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28594999/regenerating-bone-via-multifunctional-coatings-the-blending-of-cell-integration-and-bacterial-inhibition-properties-on-the-surface-of-biomaterials
#12
Mireia Hoyos-Nogués, Ferran Velasco, Maria-Pau Ginebra, José María Manero, F Javier Gil, Carlos Mas-Moruno
In dentistry and orthopedics, it is well accepted that implant fixation is a major goal. However, an emerging concern is bacterial infection. Infection of metallic implants can be catastrophic and significantly reduce patient quality of life. Accordingly, in this work we focus on multifunctional coatings to simultaneously address and mitigate both these problems. We have developed a tailor-made peptide-based chemical platform that integrates the well known RGD cell adhesive sequence and the lactoferrin-derived LF1-11 antimicrobial peptide...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28581710/biotransformation-of-silver-released-from-nanoparticle-coated-titanium-implants-revealed-in-regenerating-bone
#13
Hua Geng, Gowsihan Poologasundarampillai, Naomi Todd, Aine Devlin-Mullin, Katie L Moore, Zahra Golrokhi, James B Gilchrist, Eric Jones, Richard J Potter, Chris Sutcliffe, Marie O'Brien, David W L Hukins, Sarah Cartmell, Christopher A Mitchell, Peter D Lee
Antimicrobial silver nanoparticle coatings have attracted interest for reducing prosthetic joint infection. However, few studies report in vivo investigations of the biotransformation of silver nanoparticles within the regenerating tissue and its impact on bone formation. We present a longitudinal investigation of the osseointegration of silver nanoparticle-coated additive manufactured titanium implants in rat tibial defects. Correlative imaging at different time points using nanoscale secondary ion mass spectrometry, transmission electron microscopy (TEM), histomorphometry, and 3D X-ray microcomputed tomography provided quantitative insight from the nano- to macroscales...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28581702/universal-coating-from-electrostatic-self-assembly-to-prevent-multi-drug-resistant-bacteria-colonization-on-medical-devices-solid-surfaces
#14
Wenshu Zheng, Yuexiao Jia, Wenwen Chen, Guanlin Wang, Xuefeng Guo, Xingyu Jiang
We provide a facile and scalable strategy to prepare gold nanoparticles (AuNPs)-based antibacterial coating on a variety of surfaces through electrostatic self-assembly. 4,6-diamino-2-pyrimidinethiol (DAPT, itself non-antibiotic)-conjugated AuNPs (AuDAPT) can from highly stable coating on different substrates in one-step, such coating can efficiently eradicate pathogenic gram-negative bacteria and even multidrug resistant (MDR) mutants without causing any side-effect such as cytotoxicity, hemolysis, coagulation and inflammation...
June 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28579540/a-multi-defense-strategy-enhancing-bactericidal-activity-of-a-medical-grade-polymer-with-a-nitric-oxide-donor-and-surface-immobilized-quaternary-ammonium-compound
#15
Jitendra Pant, Jing Gao, Marcus J Goudie, Sean P Hopkins, Jason Locklin, Hitesh Handa
Although the use of biomedical devices in hospital-based care is inevitable, unfortunately, it is also one of the leading causes of the nosocomial infections, and thus demands development of novel antimicrobial materials for medical device fabrication. In the current study, a multi-defense mechanism against Gram-positive and Gram-negative bacteria is demonstrated by combining a nitric oxide (NO) releasing agent with a quaternary ammonium antimicrobial that can be covalently grafted to medical devices. Antibacterial polymeric composites were fabricated by incorporating an NO donor, S-nitroso-N-acetyl-penicillamine (SNAP) in CarboSil® polymer and top coated with surface immobilized benzophenone based quaternary ammonium antimicrobial (BPAM) small molecule...
June 1, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28576360/characterization-of-antimicrobial-properties-of-salmonella-phage-felix-o1-and-listeria-phage-a511-embedded-in-xanthan-coatings-on-poly-lactic-acid-films
#16
Devon Radford, Brandon Guild, Philip Strange, Rafath Ahmed, Loong-Tak Lim, S Balamurugan
Beyond simply providing a barrier between food and external contaminants, active packaging technologies aim to inhibit pathogen survival and growth within the packaged environment. Bacteriophages have a proven track record as targeted antimicrobials but have yet to be successfully integrated in active packaging without serious loss of activity. We have developed two bacteriophage based xanthan coatings on poly(lactic acid) (PLA) film which significantly inhibits Salmonella Typhimurium and Listeria monocytogenes growth in culture (P < 0...
September 2017: Food Microbiology
https://www.readbyqxmd.com/read/28575940/ag-nanoparticle-coated-zirconia-for-antibacterial-prosthesis
#17
Risa Yamada, Kosuke Nozaki, Naohiro Horiuchi, Kimihiro Yamashita, Reina Nemoto, Hiroyuki Miura, Akiko Nagai
Bacterial adhesion to dental materials is a major cause of caries and periodontitis, necessitating the development of compounds such as yttria-stabilized zirconia (YSZ) and silver nanoparticles (AgNPs), which are widely employed in medicine due to their high antimicrobial activity and low cytotoxicity. The main goal of this study is the synthesis of the broad antimicrobial activity of AgNP-coated YSZ with facile methods. The bactericidal AgNPs were immobilized on the surface of YSZ and tested for bactericidal activity against Staphylococcus aureus, Streptococcus mutans, Escherichia coli, and Aggregatibacter actinomycetemcomitans based on ISO 22196:2007...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28571692/understanding-long-term-silver-release-from-surface-modified-porous-titanium-implants
#18
Anish Shivaram, Susmita Bose, Amit Bandyopadhyay
Prevention of orthopedic device related infection (ODRI) using antibiotics has met with limited amount of success and is still a big concern during post-surgery. As an alternative, use of silver as an antibiotic treatment to prevent surgical infections is being used due to the well-established antimicrobial properties of silver. However, in most cases silver is used in particulate form with wound dressings or with short-term devices such as catheters but not with load-bearing implants. We hypothesize that strongly adherent silver to load-bearing implants can offer longer term solution to infection in vivo...
May 29, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28560581/antimicrobial-and-anti-biofilm-properties-of-polypropylene-meshes-coated-with-metal-containing-dlc-thin-films
#19
Elisa M Cazalini, Walter Miyakawa, Guilherme R Teodoro, Argemiro S S Sobrinho, José E Matieli, Marcos Massi, Cristiane Y Koga-Ito
A promising strategy to reduce nosocomial infections related to prosthetic meshes is the prevention of microbial colonization. To this aim, prosthetic meshes coated with antimicrobial thin films are proposed. Commercial polypropylene meshes were coated with metal-containing diamond-like carbon (Me-DLC) thin films by the magnetron sputtering technique. Several dissimilar metals (silver, cobalt, indium, tungsten, tin, aluminum, chromium, zinc, manganese, tantalum, and titanium) were tested and compositional analyses of each Me-DLC were performed by Rutherford backscattering spectrometry...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28554344/overview-of-nanoparticle-coating-of-dental-implants-for-enhanced-osseointegration-and-antimicrobial-purposes
#20
Feridoun Parnia, Javad Yazdani, Vahid Javaherzadeh, Solmaz Maleki Dizaj
PURPOSE: Nanomaterials are suitable candidates for coating of titanium based (Ti-based) dental implants due to their unique properties. The objective of this article is to summarize the application of nanoparticles as Ti-based implant coating materials in order to control and improve the implant success rate with focus on enhanced osseointegration and antimicrobial purposes. METHOD: This review was conducted using electronic databases and MeSH keywords to detect associated scientific literature published in English...
2017: Journal of Pharmacy & Pharmaceutical Sciences: a Publication of the Canadian Society for Pharmaceutical Sciences
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