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https://www.readbyqxmd.com/read/28219824/characterisation-of-the-first-kpc-2-producing-klebsiella-pneumoniae-st340-from-peru
#1
Gertrudis Horna, Jorge Velasquez, Nathaly Fernández, Jesus Tamariz, Joaquim Ruiz
OBJECTIVES: The aim of this study was to characterise a KPC-carrying Klebsiella pneumoniae isolate from a Peruvian hospital setting. METHODS: The identity of the isolate was confirmed by amplification and sequencing of the 16S rRNA gene, and the antibiotic resistance profile was determined by disk diffusion and automated METHODS: The sequence type (ST) and phylogenetic group were established by PCR. The presence of different β-lactamase genes was determined, including blaMBL, blaKPC, blaCTX-M, blaSHV, blaOXA-1-like, blaOXA-2-like, blaOXA-5-like, blaOXA-48-like and blaTEM and up to six different plasmid-encoded AmpC genes as well as class 1 integrons...
February 17, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28208859/diphtheroids-important-nosocomial-pathogens
#2
Reshmi Chandran, Dinju Raj Puthukkichal, Ethel Suman, Shashidhar Kotian Mangalore
INTRODUCTION: Diphtheroids are defined as aerobic, non-sporulating, pleomorphic Gram-positive bacilli which are more uniformly stained than Corynebacterium diphtheriae, lack the metachromatic granules and are arranged in a palisade manner. They are usually commensals of the skin and mucous membranes. They differ from C.diphtheriae in biochemical rea-ctions as well as in toxin production. Since, they are usually found as commensals on the skin, they are often considered as mere contaminants when isolated from clinical samples...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208494/percolation-of-binary-disk-systems-modeling-and-theory
#3
Kelsey Meeks, John Tencer, Michelle L Pantoya
The dispersion and connectivity of particles with a high degree of polydispersity is relevant to problems involving composite material properties and reaction decomposition prediction and has been the subject of much study in the literature. This work utilizes Monte Carlo models to predict percolation thresholds for a two-dimensional systems containing disks of two different radii. Monte Carlo simulations and spanning probability are used to extend prior models into regions of higher polydispersity than those previously considered...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208264/scanning-electrochemical-microscopy-with-forced-convection-introduced-by-high-precision-stirring
#4
Christian Iffelsberger, Preety Vatsyayan, Frank-Michael Matysik
In the present report the well-known advantages of hydrodynamic mass transport in electrochemical systems are used in combination with scanning electrochemical microscopy (SECM). The hydrodynamic SECM system integrates a high-precision stirring device into the experimental setup. The well-defined stirring of the SECM electrolyte results in steady state diffusion layer characteristics in the vicinity of large substrate electrodes operated in chronoamperometric measuring mode. For a range of rotation frequencies of a rotating cylinder the thickness and the stability of the diffusion layer was studied by hydrodynamic SECM in the substrate generation/tip collection (SG/TC) as well as in the competition mode using ferrocene methanol as redox mediator...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28203213/high-resolution-audio-with-inaudible-high-frequency-components-induces-a-relaxed-attentional-state-without-conscious-awareness
#5
Ryuma Kuribayashi, Hiroshi Nittono
High-resolution audio has a higher sampling frequency and a greater bit depth than conventional low-resolution audio such as compact disks. The higher sampling frequency enables inaudible sound components (above 20 kHz) that are cut off in low-resolution audio to be reproduced. Previous studies of high-resolution audio have mainly focused on the effect of such high-frequency components. It is known that alpha-band power in a human electroencephalogram (EEG) is larger when the inaudible high-frequency components are present than when they are absent...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28202826/-hypogeusia-and-high-signals-in-the-nuclei-of-the-solitary-tract-on-mri-due-to-varicella-zoster-virus-infection-a-case-report
#6
Yuji Shiga, Yuhei Kanaya, Shinichi Takeshima, Yutaka Shimoe, Akio Tanaka, Masaru Kuriyama
A 63-year-old man noticed hypogeusia after presenting hiccups for several days. He was serologically diagnosed with varicella-zoster virus (VZV) infection, but had no skin lesions typical of herpes (zoster sine herpete). Hypogeusia was confirmed by electrogustometry and the filter-paper disk method, which showed damage in the areas innervated by the cord of tympanum, glossopharyngeal nerve, and greater petrosal nerve. High signals in the nuclei of the solitary tract of the medulla oblongata and the enhancement of the bilateral intracranial segments of the cranial nerve IX and X complex were observed by magnetic resonance imaging (MRI)...
February 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/28202380/impact-of-surgical-site-infection-and-surgical-debridement-on-lumbar-arthrodesis-a-single-institution-analysis-of-incidence-and-risk-factors
#7
Timothy Y Wang, Adam G Back, Eliza Hompe, Kevin Wall, Oren N Gottfried
This study identifies the rate of pseudarthrosis following surgical debridement for deep lumbar spine surgical site infection and identify associated risk factors. Patients who underwent index lumbar fusion surgery from 2013 to 2014 were included if they met the following criteria: 1) age >18years, 2) had debridement of deep lumbar SSI, and had 3) lumbar spine AP, lateral and flexion/extension X-rays and computed tomography (CT) at 12months or greater postoperatively. Criteria for fusion included 1) solid posterolateral, facet, or disk space bridging bone, 2) no translational or angular motion on flexion/extension X-rays, and 3) intact posterior hardware without evidence of screw lucency or breakage...
February 12, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28186775/stability-limits-and-defect-dynamics-in-ag-nanoparticles-probed-by-bragg-coherent-diffractive-imaging
#8
Y Liu, P P Lopes, W Cha, R Harder, J Maser, E Maxey, M J Highland, N M Markovic, S O Hruszkewycz, G B Stephenson, H You, A Ulvestad
Dissolution is critical to nanomaterial stability, especially for partially dealloyed nanoparticle catalysts. Unfortunately, highly active catalysts are often not stable in their reactive environments, preventing widespread application. Thus, focusing on the structure-stability relationship at the nanoscale is crucial and will likely play an important role in meeting grand challenges. Recent advances in imaging capability have come from electron, X-ray, and other techniques but tend to be limited to specific sample environments and/or two-dimensional images...
February 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28182054/design-formulation-and-physicochemical-evaluation-of-periodontal-propolis-mucoadhesive-gel
#9
Abolfazl Aslani, Negar Malekpour
BACKGROUND: Periodontitis is a disease of tooth supporting tissues, and Gram-negative Bacteria are the main cause of this. Propolis has antibacterial, anti-inflammatory, and antioxidant effects due to its high polyphenol and flavonoids content. The aim of this study is the formulation of a mucoadhesive gel containing concentrated extract of propolis for treatment of periodontitis. MATERIALS AND METHODS: Formulations containing carbopol 940, sodium carboxymethylcellulose (NaCMC), hydroxypropyl methylcellulose K4M, and propolis extract were prepared...
November 2016: Dental Research Journal
https://www.readbyqxmd.com/read/28181607/robust-temperature-change-rate-actuated-valving-and-switching-for-highly-integrated-centrifugal-microfluidics
#10
M Keller, G Czilwik, J Schott, I Schwarz, K Dormanns, F von Stetten, R Zengerle, N Paust
We present new unit operations for valving and switching in centrifugal microfluidics that are actuated by a temperature change rate (TCR) and controlled by the rotational frequency. Implementation is realized simply by introducing a comparatively large fluidic resistance to an air vent of a fluidic structure downstream of a siphon channel. During temperature decrease at a given TCR, the air pressure inside the downstream structure decreases and the fluidic resistance of the air vent slows down air pressure compensation allowing a thermally induced underpressure to build up temporarily...
February 9, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28179118/genetic-diversity-of-methicillin-resistant-staphylococcus-aureus-strains-isolated-from-burn-patients-in-iran-st239-sccmec-iii-t037-emerges-as-the-major-clone
#11
Mehdi Goudarzi, Mahnaz Bahramian, Mahboobeh Satarzadeh Tabrizi, Edet E Udo, Agnes Marie Sá Figueiredo, Maryam Fazeli, Hossein Goudarzi
Methicillin-resistant Staphylococcus aureus (MRSA) as a major cause of infection in health care, hospital and community settings is a global health concern. The purpose of this study was to determine the antibiotic susceptibility pattern and distribution of circulating molecular types of MRSA in a burn hospital in Tehran, the capital of Iran. During a 10-month study period, 106 Staphylococcus aureus isolates were assessed. Isolates were subjected to susceptibility testing using the disk diffusion method and Polymerase Chain Reaction (PCR) for detection of mecA, fem and nuc genes...
February 5, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28174570/antimicrobial-resistance-and-molecular-epidemiology-of-esbl-producing-escherichia-coli-isolated-from-outpatients-in-town-hospitals-of-shandong-province-china
#12
Zengmin Miao, Song Li, Lei Wang, Wengang Song, Yufa Zhou
This study aimed to investigate antimicrobial resistance and molecular epidemiology of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli (E. coli) isolated from outpatients in town hospitals of Shandong province, China. Antimicrobial susceptibility of ESBL-producing E. coli was tested using the disk diffusion and resistance genes encoding for β-lactamases (blaTEM, blaCTXM, and blaSHV) were detected by polymerase chain reaction (PCR). Multilocus sequence typing (ST) of ESBL-producing E. coli was analyzed in this study...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28174009/ceramic-strengthening-by-tuning-the-elastic-moduli-of-resin-based-luting-agents
#13
Aloísio O Spazzin, Ataís Bacchi, Rodrigo Alessandretti, Mateus B Santos, Gabriela R Basso, Jason Griggs, Rafael R Moraes
OBJECTIVE: Resin-based luting agents (RBLAs) with tuned elastic moduli (E) were prepared and their influence on the strengthening, reliability, and mode of failure of luted feldspar ceramic was investigated. METHODS: RBLAs with low E (2.6GPa), intermediate E (6.6GPa), and high E (13.3GPa) were prepared and used to coat acid-etched ceramic disks. Positive (untreated ceramic) and negative (acid-etched ceramic) control groups were tested. The response variables (n=30) were biaxial flexural strength (σbf, MPa), characteristic strength (σ0, MPa), and Weibull modulus at the ceramic surface (z=0) and luting agent surface (z=-t2)...
February 4, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28167857/high-frequency-of-vancomycin-resistant-enterococcus-faecalis-in-children-an-alarming-concern
#14
F Sabouni, Z Movahedi, S Mahmoudi, B Pourakbari, S Keshavarz Valian, S Mamishi
INTRODUCTION: Enterococcus spp. is considered as important etiological agents of nosocomial infections. However, a little is known about the epidemiology of vancomycin resistant Enterococcus faecalis (VREF). The aim of this study was to investigate the frequency of VREF and detecting of two prevalent resistance genes (vanA, vanB) at Children Medical Center Hospital, an Iranian referral pediatric Hospital. MATERIALS AND METHODS: During January 2013 to December 2013, 180 E...
December 2016: Journal of Preventive Medicine and Hygiene
https://www.readbyqxmd.com/read/28164610/an-investigation-of-the-frequency-of-upper-respiratory-tract-infection-pathogens-and-their-antibiotic-patterns-in-tonsils-and-adenoids-of-adenotonsillectomy-patients
#15
Yasar Nakipoglu, Gulsen Gunel, Deniz Kanliada, Levent Aydemir, Nezahat Gurler, Bulent Gurler
BACKGROUND: We aimed to investigate the potentially pathogenic bacteria of upper respiratory tract infections (URTIs) and their susceptibilities to different antibiotics. METHODS: Two-hundred adenoid and tonsil specimens from 100 patients who had undergone adenotonsillectomy were obtained and analyzed bacteriologically. Identification of the pathogens was made by conventional or commercial identification systems and antibiotic susceptibility tests were carried out by disk diffusion method...
August 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28161293/molecular-epidemiology-of-carbapenemase-producing-enterobacteriaceae-in-a-primary-care-hospital-in-japan-2010-2013
#16
Yuki Ohno, Akihiro Nakamura, Eriko Hashimoto, Hiroko Matsutani, Noriyuki Abe, Saori Fukuda, Kohno Hisashi, Masaru Komatsu, Fumihiko Nakamura
Recently, carbapenemase-producing Enterobacteriaceae (CPE) have been spreading worldwide and have become a threat in healthcare systems. We investigated the isolation frequency and molecular epidemiological characteristics of CPE isolated from clinical samples collected at a primary care hospital over the four years of 2010-2013 in Japan. CPE were detected in 17 (0.34%) of 4875 isolates by the broth microdilution method, sodium mercaptoacetate inhibition test, and modified Hodge test using meropenem disks. The frequency of CPE isolates was 0...
February 1, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28158027/high-power-yb-ggg-thin-disk-laser-oscillator-first-demonstration-and-power-scaling-prospects
#17
A Diebold, Z Jia, I J Graumann, Y Yin, F Emaury, C J Saraceno, X Tao, U Keller
We present the first demonstration of a thin-disk laser based on the gain material Yb:GGG. This material has many desirable properties for the thin-disk geometry: a high thermal conductivity, which is nearly independent of the doping concentration, a low quantum defect, low-temperature growth, and a broadband absorption spectrum, making it a promising contender to the well-established Yb:YAG for high-power applications. In continuous wave laser operation, we demonstrate output powers above 50 W, which is an order of magnitude higher than previously achieved with this material in the bulk geometry...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28158020/droop-free-al-sub-x-sub-ga-sub-1-x-sub-n-al-sub-y-sub-ga-sub-1-y-sub-n-quantum-disks-in-nanowires-ultraviolet-led-emitting-at-337-nm-on-metal-silicon-substrates
#18
Bilal Janjua, Haiding Sun, Chao Zhao, Dalaver H Anjum, Davide Priante, Abdullah A Alhamoud, Feng Wu, Xiaohang Li, Abdulrahman M Albadri, Ahmed Y Alyamani, Munir M El-Desouki, Tien Khee Ng, Boon S Ooi
Currently the AlGaN-based ultraviolet (UV) solid-state lighting research suffers from numerous challenges. In particular, low internal quantum efficiency, low extraction efficiency, inefficient doping, large polarization fields, and high dislocation density epitaxy constitute bottlenecks in realizing high power devices. Despite the clear advantage of quantum-confinement nanostructure, it has not been widely utilized in AlGaN-based nanowires. Here we utilize the self-assembled nanowires (NWs) with embedding quantum-disks (Qdisks) to mitigate these issues, and achieve UV emission of 337 nm at 32 A/cm<sup>2</sup> (80 mA in 0...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28157943/hybrid-confinement-of-optical-and-mechanical-modes-in-a-bullseye-optomechanical-resonator
#19
Felipe G S Santos, Yovanny A V Espinel, Gustavo O Luiz, Rodrigo S Benevides, Gustavo S Wiederhecker, Thiago P Mayer Alegre
Optomechanical cavities have proven to be an exceptional tool to explore fundamental and applied aspects of the interaction between mechanical and optical waves. Here we demonstrate a novel optomechanical cavity based on a disk with a radial mechanical bandgap. This design confines light and mechanical waves through distinct physical mechanisms which allows for independent control of the mechanical and optical properties. Simulations foresee an optomechanical coupling rate g<sub>0</sub> reaching 2π × 100 kHz for mechanical frequencies around 5 GHz as well as anchor loss suppression of 60 dB...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28157196/effect-of-different-titanium-surfaces-on-maturation-of-murine-bone-marrow-derived-dendritic-cells
#20
Xiaofei Zheng, Fengjuan Zhou, Yifei Gu, Xiaobo Duan, Anchun Mo
Dendritic cells (DCs) play a pivotal role in the host response to implanted biomaterials. Osseointegration of titanium (Ti) implant is an immunological and inflammatory-driven process. However, the role of DCs in this complex process is largely unknown. This study aimed to investigate the effect of different Ti surfaces on DC maturation, and evaluate its subsequent potential on osteogenic differentiation of preosteoblasts. Murine bone marrow-derived DCs were seeded on Ti disks with different surface treatments, including pretreatment (PT), sandblasted/acid-etched (SLA) and modified SLA (modSLA) surface...
February 3, 2017: Scientific Reports
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