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https://www.readbyqxmd.com/read/28728044/atomic-force-microscopy-study-of-morphological-modifications-induced-by-different-decontamination-treatments-on-escherichia-coli
#1
Florina Lucica Zorila, Cristina Ionescu, Liviu Stefan Craciun, Bogdan Zorila
In this paper we used atomic force microscopy (AFM) to investigate the surface morphology of Escherichia coli, after being subjected to decontamination treatments, at sub-MICs levels (minimal inhibitory concentrations), with different disinfectants used in hospitals, pharmaceutical, food industry and even in our home, as an essential means to prevent the spreading of microorganisms. This article focuses on different morphological modifications adopted by E. coli cells as responses to the different modes of action of these substances...
July 14, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28725151/chemical-constituents-of-helichrysum-italicum-roth-g-don-essential-oil-and-their-antimicrobial-activity-against-gram-positive-and-gram-negative-bacteria-filamentous-fungi-and-candida-albicans
#2
Bouzid Djihane, Nouioua Wafa, Soltani Elkhamssa, De Haro Juan Pedro, Angeles Esteban Maria, Zerroug Mohamed Mihoub
The aerial parts of Helichrysum italicum (Roth) G. Don were subjected to hydrodistillation to obtain essential oils which had been analyzed by gas chromatography and gas chromatography coupled with mass spectrometry and tested for antimicrobial activity against 12 bacteria, two yeasts and four fungi by agar diffusion method. The essential oil yielded 0.44% (v/w) and 67 compounds accounting for 99.24% of the oil were identified with a high content of oxygenated sesquiterpenes (61.42%). The most oxygenated sesquiterpene compounds were α-Cedrene (13...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28720992/ganglion-cyst-of-the-hip-mimicking-lumbar-disk-herniation-a-case-report
#3
Devendra Lakhotia, Kumar Prashant, Won Yong Shon
Sciatic nerve compression due to a ganglion cyst around the posterior aspect of the hip joint is not commonly described in literature. We report a rare case of a 63-year-old man with a ganglion cyst around his hip joint, who presented with symptoms of sciatica. After excision of the cyst, the patient was symptom free. A high index of clinical doubt and detailed clinical examination is required for non-palpable cystic lesions in close proximity to the sciatic nerve in patients presenting with symptoms of sciatica and in patients with concomitant of lumbar disk herniation...
April 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28719217/single-molecule-study-on-polymer-nanoparticle-interactions-the-particle-shape-matters
#4
Zhandong Li, Bin Zhang, Yu Song, Yurui Xue, Lixin Wu, Wenke Zhang
The study on the nanoparticle-polymer interactions is very important for the design/preparation of high performance polymer nanocomposite. Here we present a method to quantify the polymer-particle interaction at single molecule level by using AFM-based single molecule force spectroscopy (SMFS). As a proof-of-concept study, we choose Poly-L-Lysine (PLL) as the polymer and several different types of polyoxometalates (POM) as the model particles to construct several different polymer nanocomposites and to reveal the binding mode and quantify the binding strength in these systems...
July 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28712796/electrosurgery-induced-damage-to-ti-6al-4v-and-cocrmo-alloy-surfaces-in-orthopedic-implants-in%C3%A2-vivo-and-in%C3%A2-vitro
#5
Gregory W Kubacki, Shiril Sivan, Jeremy L Gilbert
BACKGROUND: Recent observations of specific metal damage patterns on retrieved total joint implants implied a cellular origin and was termed inflammatory cell-induced (ICI) corrosion. Although ICI corrosion continues to present a potential damage source for metallic biomaterials surfaces, an alternate source of some damage patterns may arise from electrosurgery instruments in total joint arthroplasty. METHODS: To characterize electrosurgically-induced damage patterns on metal implants, a model system of highly polished CoCrMo and Ti-6Al-4V disks and commercial electrosurgical generator was evaluated in various modes and power settings using monopolar and bipolar configurations...
June 17, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28706994/short-range-surface-plasmonics-localized-electron-emission-dynamics-from-a-60-nm-spot-on-an-atomically-flat-single-crystalline-gold-surface
#6
Bettina Frank, Philip Kahl, Daniel Podbiel, Grisha Spektor, Meir Orenstein, Liwei Fu, Thomas Weiss, Michael Horn-von Hoegen, Timothy J Davis, Frank-J Meyer Zu Heringdorf, Harald Giessen
We experimentally and theoretically visualize the propagation of short-range surface plasmon polaritons using atomically flat single-crystalline gold platelets on silicon substrates. We study their excitation and subfemtosecond dynamics via normal-incidence two-photon photoemission electron microscopy. By milling a plasmonic disk and grating structure into a single-crystalline gold platelet, we observe nanofocusing of the short-range surface plasmon polariton. Localized two-photon ultrafast electron emission from a spot with a smallest dimension of 60 nm is observed...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28706882/distribution-of-the-strains-of-multidrug-resistant-extensively-drug-resistant-and-pandrug-resistant-pseudomonas-aeruginosa-isolates-from-burn-patients
#7
Hajieh Ghasemian Safaei, Sharareh Moghim, Bahram Nasr Isfahani, Hossein Fazeli, Farkhondeh Poursina, Sima Yadegari, Pourya Nasirmoghadas, Seyed Abolfazl Hosseininassab Nodoushan
BACKGROUND: Pseudomonas aeruginosa is an opportunistic and Gram-negative pathogen that is used as the most important factor in burn wound infections, and due to the rapid acquisition of multidrug resistance (MDR), it causes high mortality rates in these sectors. Thus, diagnosis and assessment of antibiotic resistance patterns are very important in these patients. The aim of this study was to evaluate antibiotic resistance pattern and determining P. aeruginosa MDR. MATERIALS AND METHODS: In this study, phenotypic, biochemical, and polymerase chain reaction tests were used to identify P...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28704783/biomass-derived-heteroatoms-doped-mesoporous-carbon-for-efficient-oxygen-reduction-in-microbial-fuel-cells
#8
Yu Lu, Nengwu Zhu, Fuhua Yin, Tingting Yang, Pingxiao Wu, Zhi Dang, Meilin Liu, Xiaorong Wei
Currently, the development of less expensive, more active and more stable catalysts like heteroatom-doped carbon based non-precious metal materials are highly desired for the cathodic oxygen reduction reaction (ORR) in microbial fuel cells (MFCs). Comparing with heteroatom sources from chemical reagents, biomass is notably inexpensive and abundant, containing more elements which contribute to ORR activity. Herein, we demonstrate an easy operating one-step and low-cost way to synthesize egg-derived heteroatoms-doped mesoporous carbon (EGC) catalysts utilizing egg as the biomass carbon and other elements source (sulphur, phosphorus, boron and iron), and porous g-C3N4 as both template and nitrogen source...
July 5, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28704035/oblique-colloidal-lithography-for-the-fabrication-of-nonconcentric-features
#9
Zhi Zhao, Yang Cao, Yangjun Cai, Jian Yang, Ximin He, Peter Nordlander, Paul S Cremer
Herein, we describe the development of oblique colloidal lithography (OCL) and establish a systematic patterning strategy for creating libraries of nanosized nonconcentric plasmonic structures. This strategy combines OCL, capillary force lithography, and several wet and ion etching steps. Hexagonal arrays of nonconcentric gold features were created on glass substrates with highly controllable geometric parameters. The size, geometry, and eccentricity of the gold features could be independently tuned by controlling the experimental conditions...
July 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28703342/evaluation-of-direct-antifungal-susceptibility-testing-methods-of-candida-spp-from-positive-blood-culture-bottles
#10
Yasemin Oz, Egemen Gokbolat
BACKGROUND: Blood culture is the gold standard diagnostic method in candidemia in spite of long result time and low sensitivity rate. Early diagnosis is crucial for management of candidemia because a delay in treatment is related with increased mortality. We aimed to evaluate the direct applicability of antifungal susceptibility testing methods from positive blood culture bottles to save at least 24 hours. METHODS: Blood culture bottles were inoculated with 62 Candida isolates...
July 13, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28701766/collective-motion-of-cells-crawling-on-a-substrate-roles-of-cell-shape-and-contact-inhibition
#11
Simon K Schnyder, John J Molina, Yuki Tanaka, Ryoichi Yamamoto
Contact inhibition plays a crucial role in cell motility, wound healing, and tumour formation. By mimicking the mechanical motion of cells crawling on a substrate, we constructed a minimal model of migrating cells that naturally gives rise to contact inhibition of locomotion (CIL). The model cell consists of two disks, a front disk (a pseudopod) and a back disk (cell body), which are connected by a finite extensible spring. Despite the simplicity of the model, the collective behaviour of the cells is highly non-trivial and depends on both the shape of the cells and whether CIL is enabled...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28700648/highly-diverse-and-antimicrobial-susceptible-escherichia-coli-display-a-na%C3%A3-ve-bacterial-population-in-fruit-bats-from-the-republic-of-congo
#12
Kathrin Nowak, Jakob Fahr, Natalie Weber, Antina Lübke-Becker, Torsten Semmler, Sabrina Weiss, Jean-Vivien Mombouli, Lothar H Wieler, Sebastian Guenther, Fabian H Leendertz, Christa Ewers
Bats are suspected to be a reservoir of several bacterial and viral pathogens relevant to animal and human health, but studies on Escherichia coli in these animals are sparse. We investigated the presence of E. coli in tissue samples (liver, lung and intestines) collected from 50 fruit bats of five different species (Eidolon helvum, Epomops franqueti, Hypsignathus monstrosus, Myonycteris torquata, Rousettus aegyptiacus) of two different areas in the Republic of Congo between 2009 and 2010. To assess E. coli pathotypes and phylogenetic relationships, we determined the presence of 59 virulence associated genes and multilocus sequence types (STs)...
2017: PloS One
https://www.readbyqxmd.com/read/28700050/characterization-of-biofilm-formation-antimicrobial-resistance-and-staphylococcal-cassette-chromosome-mec-analysis-of-methicillin-resistant-staphylococcus-hominis-from-blood-cultures-of-children
#13
Setareh Soroush, Fereshteh Jabalameli, Morovat Taherikalani, Mohammad Amin Eslampour, Reza Beigverdi, Mohammad Emaneini
INTRODUCTION: Methicillin resistant Staphylococcus hominis (MRSHo) has been recognized as an important human pathogen, particularly in immunocompromised patients. METHODS: A total of 19 S. hominis isolates were collected from children at the Children's Medical Centre, Tehran, Iran, from March 2012 to February 2013. MRSHo susceptibility against 13 antimicrobial and 3 antiseptic agents was determined using disk diffusion (DAD) and minimum inhibitory concentration (MIC), respectively...
May 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28691215/photochromic-inorganic-organic-thermoplastic-elastomers
#14
Jiuyang Zhang, Jing Li, Mengmeng Huo, Naixu Li, Jiancheng Zhou, Tuoqi Li, Jing Jiang
Photochromic materials are an important class of "smart materials" and are broadly utilized in technological devices. However, most photochromic materials reported so far are composed of inorganic compounds that are challenging to process and suffer from poor mechanical performance, severely limiting their applications in various markets. In this paper, inorganic photochromic tungsten trioxide (WO3 ) nanocrystals are conveniently grafted with polymers to hurdle the deficiency in processability and mechanical properties...
July 10, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28689911/effect-of-grinding-and-polishing-on-roughness-and-strength-of-zirconia
#15
Waad Khayat, Najla Chebib, Matthew Finkelman, Samer Khayat, Ala Ali
STATEMENT OF PROBLEM: The clinical applications of high-translucency monolithic zirconia restorations have increased. Chairside and laboratory adjustments of these restorations are inevitable, which may lead to increased roughness and reduced strength. The influence of grinding and polishing on high-translucency zirconia has not been investigated. PURPOSE: The purpose of this in vitro study was to compare the roughness averages (Ra) of ground and polished zirconia and investigate whether roughness influenced strength after aging...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28689137/a-simplified-model-for-equilibrium-and-transient-swelling-of-thermo-responsive-gels
#16
A D Drozdov, J deClaville Christiansen
A simplified model is developed for the elastic response of thermo-responsive gels subjected to swelling under an arbitrary deformation with finite strains. The constitutive equations involve five adjustable parameters that are determined by fitting observations in equilibrium water uptake tests and T-jump transient tests on thin gel disks. Two scenarios for water release under heating are revealed by means of numerical simulation. When the final temperature in a T-jump test is below the volume-phase transition temperature, deswelling is characterized by smooth distribution of water molecules and small tensile stresses...
June 30, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28688235/hiv-associated-cardiovascular-disease-role-of-connexin-43
#17
Lisa Prevedel, Camilla Morocho, Michael V L Bennett, Eliseo A Eugenin
Chronic HIV infection due to effective antiretroviral treatment has resulted in a broad range of clinical complications, including accelerated heart disease. Individuals with HIV infection have a 1.5 to 2 times higher incidence of cardiovascular diseases than their uninfected counterparts; however, the underlying mechanisms are poorly understood. To explore the link between HIV infection and cardiovascular diseases, we used postmortem human heart tissues obtained from HIV-infected and control uninfected individuals to examine connexin 43 (Cx43) expression and distribution and HIV-associated inflammation...
July 5, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28685187/compatibility-of-fosfomycin-with-different-commercial-peritoneal-dialysis-solutions
#18
M Kussmann, A Baumann, S Hauer, P Pichler, M Zeitlinger, M Wiesholzer, H Burgmann, W Poeppl, G Reznicek
For treatment of peritoneal dialysis-related peritonitis, intraperitoneal administration of antibiotics remains the preferable route. For home-based therapy, patients are commonly supplied with peritoneal dialysis fluids already containing antimicrobial agents. The present study set out to investigate the compatibility of fosfomycin with different peritoneal dialysis fluids, namely, Extraneal(®), Nutrineal(®), Physioneal(®) 1.36% and Physioneal(®) 2.27%, under varying storage conditions. The peritoneal dialysis fluid bags including 4 g fosfomycin were stored over 14 days at refrigeration temperature (6°C) and room temperature (25°C) and over 24 h at body temperature (37°C)...
July 6, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28683780/bacterial-agents-and-antibiotic-resistance-profiles-of-infections-from-different-sites-that-occurred-among-patients-at-debre-markos-referral-hospital-ethiopia-a-cross-sectional-study
#19
Wondemagegn Mulu, Bayeh Abera, Mulat Yimer, Tadesse Hailu, Haimanot Ayele, Dereje Abate
BACKGROUND: In developing countries like Ethiopia, infections with antibiotic resistant bacteria become a real threat. Hence, monitoring of local level antimicrobial resistance profile is indispensable to contain the spread of drug resistant bacteria and intervene poor awareness on antimicrobial resistance. Therefore, this study aimed at determining bacterial and antibiotic resistance profiles of infections from different sites that occurred among patients. METHODS: Retrospective data recorded were analyzed on culture and drug susceptibility test results at Debre Markos Referral Hospital which were performed from 2011 to 2014...
July 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28677392/influence-of-molecular-shape-on-the-thermal-stability-and-molecular-orientation-of-vapor-deposited-organic-semiconductors
#20
Diane M Walters, Lucas Antony, Juan J de Pablo, M D Ediger
High thermal stability and anisotropic molecular orientation enhance the performance of vapor-deposited organic semiconductors, but controlling these properties is a challenge in amorphous materials. To understand the influence of molecular shape on these properties, vapor-deposited glasses of three disk-shaped molecules were prepared. For all three systems, enhanced thermal stability is observed for glasses prepared over a wide range of substrate temperatures and anisotropic molecular orientation is observed at lower substrate temperatures...
July 11, 2017: Journal of Physical Chemistry Letters
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