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https://www.readbyqxmd.com/read/28432491/anti-biofilm-activity-of-polyazolidinammonium-modified-with-iodine-hydrate-ions-against-microbial-biofilms-of-uropathogenic-coliform-bacteria
#1
O V Nechaeva, E I Tikhomirova, D A Zayarsky, N V Bespalova, E V Glinskaya, N F Shurshalova, B M Al Bayati, A I Babailova
The dynamics of microbial biofilm formation by standard strain and by clinical strains of uropathogenic coliform bacteria was investigated in vitro and the effect of sublethal concentrations of the polymer compound polyazolidinammonium modified with iodine hydrate ions on the initial stages of biofilm formation was assessed. Treatment of immunological plate wells with the polymeric compound prevented film formation, especially in case of clinical E. coli strain carrying FimH virulence gene.
April 21, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28430110/viscosity-of-a-sheared-correlated-near-critical-model-fluid-in-confinement
#2
Christian Rohwer, Andrea Gambassi, Matthias Kruger
Second-order phase transitions are characterized by a divergence of the spatial correlation length of the order parameter fluctuations. For confined systems, this is known to lead to remarkable equilibrium physical phenomena, including finite-size effects and critical Casimir forces. We explore here some non-equilibrium aspects of these effects in the stationary state resulting from the action of external forces: by analyzing a model of a correlated fluid under shear, spatially confined by two parallel plates, we study the resulting viscosity within the setting of (Gaussian) Landau-Ginzburg theory...
April 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28425516/mechanical-and-vibrational-characterization-of-amyloid-like-het-s-nanosheets-based-on-the-skewed-plate-theory
#3
Hyun Joon Chang, Myeongsang Lee, Jae In Kim, Gwonchan Yoon, Sungsoo Na
Pathological amyloidogenic prion proteins have a toxic effect on functional cells in the human cerebrum because of poor degradability and the tendency to accumulate in an uncontrolled manner under physiological conditions. HET-s, a fungal prion protein, is known to undergo conformational variations from fibrillar to nanosheet structures during a change from low to high pH conditions. It has been said that this conformational change can lead to self-propagation by nucleating on the lateral surface of singlet fibrils...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28422170/dynamic-through-silicon-via-filling-process-using-copper-electrochemical-deposition-at-different-current-densities
#4
Fuliang Wang, Zhipeng Zhao, Nantian Nie, Feng Wang, Wenhui Zhu
This work demonstrates the dynamic through-silicon-via (TSV) filling process through staged electrodeposition experiments at different current densities. Different morphologies corresponding to TSV filling results can be obtained by controlling the applied current density. Specifically, a low current density (4 mA/cm(2)) induces seam defect filling, a medium current density (7 mA/cm(2)) induces defect-free filling, and a high current density (10 mA/cm(2)) induces void defect filling. Analysis of the filling coefficient indicates that the effect of current density on the TSV filling models is triggered by the coupling effect of consumption and diffusion of additives and copper ions...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28421767/base-layer-influence-on-protonated-aminosilane-gradient-wettability
#5
Kayesh M Ashraf, Chenyu Wang, Sithara S Nair, Kenneth J Wynne, Daniel A Higgins, Maryanne M Collinson
Protonated amine gradients have been prepared on silicon wafers via programmed controlled rate infusion (CRI) with varying degrees of hydrophobicity and characterized by X-ray photoelectron spectroscopy (XPS) and static and Wilhelmy plate dynamic contact angle measurements. Initially, base layers were spin coated from sols containing tetramethoxysilane (TMOS) and either phenyltrimethoxysilane (PTMOS), dimethyldimethoxysilane (DMDMOS), or octyltrimethoxysilane (OTMOS, C8). Amine gradients were then prepared from 3-aminopropyltriethoxysilane (APTEOS) via CRI...
April 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28421298/dog-rivalry-impacts-following-behavior-in-a-decision-making-task-involving-food
#6
Christy L Hoffman, Malini Suchak
Dogs learn a great deal from humans and other dogs. Previous studies of socially influenced learning between dogs have typically used a highly trained demonstrator dog who is unfamiliar to the observer. Because of this, it is unknown how dynamics between familiar dogs may influence their likelihood of learning from each other. In this study, we tested dogs living together in two-dog households on whether individual dogs' rivalry scores were associated with performance on a local enhancement task. Specifically, we wanted to know whether dog rivalry impacted whether an observer dog would approach a plate from which a demonstrator dog had eaten all available food, or whether the observer dog would approach the adjacent plate that still contained food...
April 18, 2017: Animal Cognition
https://www.readbyqxmd.com/read/28419843/a-review-of-in-office-dynamic-image-navigation-for-extraction-of-complex-mandibular-third-molars
#7
Robert W Emery, Oxana Korj, Ravi Agarwal
PURPOSE: We performed a retrospective review of in-office removal of complex mandibular third molars with a dynamic image navigation system (DINS). MATERIALS AND METHODS: A retrospective review was conducted of cases completed from 2010 to 2014 by a single oral and maxillofacial surgeon. The average age of the patients was 47 years (range, 27 to 72 years). Extraction complexity was classified with Juodzbalys and Daugela's classification system. The included study cases had complexity scores of 9 or greater...
March 25, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28417957/attractive-force-driven-superhardening-of-graphene-membranes-as-a-pin-point-breaking-of-continuum-mechanics
#8
Makoto Ashino, Roland Wiesendanger
Bending at the nanometre scale can substantially modify the mechanical, chemical and electronic properties of graphene membranes. The subsequent response of chemical bonds leads to deviations from plate idealisation in continuum mechanics. However, those phenomena have thus far been investigated exclusively by measuring the electronic properties of graphene deformed by compressing and stretching with local-probe techniques. Here, we report that the interatomic-attractive forces applied on the convexly-curved graphene by the probe tip give rise to a pin-point breaking of the plate idealisation in the continuum mechanics, facilitating atomically-localised enhancements in its chemical reactivity and mechanical strength...
April 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28415470/spatial-stress-distribution-analysis-by-thermoelastic-stress-measurement-and-evaluation-of-effect-of-stress-concentration-on-durability-of-various-orthopedic-implant-devices
#9
Yoshimitsu Okazaki, Daisuke Ishii, Atsushi Ogawa
Toward the development of highly durable devices, we investigated the effect of the thermoelastic constants of implantable raw metals and the surface stress distribution on the durability of various types of implant device by thermoelastic stress measurement and by evaluating the effect of the stress concentration. Surface stress was dynamically calculated from the bending moment, and the modulus of a section of a device was found to be consistent with the surface stress obtained by thermoelastic stress measurement...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415279/dynamic-heterogeneities-and-non-gaussian-behavior-in-two-dimensional-randomly-confined-colloidal-fluids
#10
Simon K Schnyder, Thomas O E Skinner, Alice L Thorneywork, Dirk G A L Aarts, Jürgen Horbach, Roel P A Dullens
A binary mixture of superparamagnetic colloidal particles is confined between glass plates such that the large particles become fixed and provide a two-dimensional disordered matrix for the still mobile small particles, which form a fluid. By varying fluid and matrix area fractions and tuning the interactions between the superparamagnetic particles via an external magnetic field, different regions of the state diagram are explored. The mobile particles exhibit delocalized dynamics at small matrix area fractions and localized motion at high matrix area fractions, and the localization transition is rounded by the soft interactions [T...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415221/dynamic-phases-of-active-matter-systems-with-quenched-disorder
#11
Cs Sándor, A Libál, C Reichhardt, C J Olson Reichhardt
Depinning and nonequilibrium transitions within sliding states in systems driven over quenched disorder arise across a wide spectrum of size scales ranging from atomic friction at the nanoscale, flux motion in type II superconductors at the mesoscale, colloidal motion in disordered media at the microscale, and plate tectonics at geological length scales. Here we show that active matter or self-propelled particles interacting with quenched disorder under an external drive represents a class of system that can also exhibit pinning-depinning phenomena, plastic flow phases, and nonequilibrium sliding transitions that are correlated with distinct morphologies and velocity-force curve signatures...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414257/spiral-plating-method-to-quantify-the-six-major-non-o157-escherichia-coli-serogroups-in-cattle-feces
#12
Pragathi B Shridhar, Lance W Noll, Charley A Cull, Xiaorong Shi, Natalia Cernicchiaro, David G Renter, Jianfa Bai, T G Nagaraja
Cattle are a major reservoir of the six major Shiga toxin-producing non-O157 Escherichia coli (STEC) serogroups (O26, O45, O103, O111, O121, and O145) responsible for foodborne illnesses in humans. Besides prevalence in feces, the concentrations of STEC in cattle feces play a major role in their transmission dynamics. A subset of cattle, referred to as super shedders, shed E. coli O157 at high concentrations (≥4 log CFU/g of feces). It is not known whether a similar pattern of fecal shedding exists for non-O157...
April 17, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28408822/negatively-charged-silver-nanoparticles-with-potent-antibacterial-activity-and-reduced-toxicity-for-pharmaceutical-preparations
#13
Lucia Salvioni, Elisabetta Galbiati, Veronica Collico, Giulia Alessio, Svetlana Avvakumova, Fabio Corsi, Paolo Tortora, Davide Prosperi, Miriam Colombo
BACKGROUND: The discovery of new solutions with antibacterial activity as efficient and safe alternatives to common preservatives (such as parabens) and to combat emerging infections and drug-resistant bacterial pathogens is highly expected in cosmetics and pharmaceutics. Colloidal silver nanoparticles (NPs) are attracting interest as novel effective antimicrobial agents for the prevention of several infectious diseases. METHODS: Water-soluble, negatively charged silver nanoparticles (AgNPs) were synthesized by reduction with citric and tannic acid and characterized by transmission electron microscopy, dynamic light scattering, zeta potential, differential centrifuge sedimentation, and ultraviolet-visible spectroscopy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28405383/a-new-apparatus-to-induce-lysis-of-planktonic-microbial-cells-by-shock-compression-cavitation-and-spray
#14
A Schiffer, M N Gardner, R H Lynn, V L Tagarielli
Experiments were conducted on an aqueous growth medium containing cultures of Escherichia coli (E. coli) XL1-Blue, to investigate, in a single experiment, the effect of two types of dynamic mechanical loading on cellular integrity. A bespoke shock tube was used to subject separate portions of a planktonic bacterial culture to two different loading sequences: (i) shock compression followed by cavitation, and (ii) shock compression followed by spray. The apparatus allows the generation of an adjustable loading shock wave of magnitude up to 300 MPa in a sterile laboratory environment...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28404548/the-tip-apex-distance-in-the-x-bolt-dynamic-plating-system
#15
M A Fernandez, A Aquilina, J Achten, N Parsons, M L Costa, X L Griffin
OBJECTIVES: The Sliding Hip Screw (SHS) is commonly used to treat trochanteric hip fractures. Fixation failure is a devastating complication requiring complex revision surgery. One mode of fixation failure is lag screw cut-out which is greatest in unstable fracture patterns and when the tip-apex distance of the lag screw is > 25 mm. The X-Bolt Dynamic Hip Plating System (X-Bolt Orthopaedics, Dublin, Ireland) is a new device which aims to reduce this risk of cut-out. However, some surgeons have reported difficulty minimising the tip-apex distance with subsequent concerns that this may lead to an increased risk of cut-out...
April 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28404228/dynamic-light-scattering-a-fast-and-reliable-method-to-analyze-bacterial-growth-during-the-lag-phase
#16
Susana Vargas, Blanca E Millán-Chiu, Sofía M Arvizu-Medrano, Achim M Loske, Rogelio Rodríguez
A comparison between plate counting (PC) and dynamic light scattering (DLS) is reported. PC is the standard technique to determine bacterial population as a function of time; however, this method has drawbacks, such as the cumbersome preparation and handling of samples, as well as the long time required to obtain results. Alternative methods based on optical density are faster, but do not distinguish viable from non-viable cells. These inconveniences are overcome by using DLS. Two different bacteria strains were considered: Escherichia coli and Staphylococcus aureus...
April 9, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28394555/morphology-controlled-synthesis-of-hybrid-nanocrystals-via-a-se-mediated-strategy-with-ligand-shielding-effect-the-case-of-dual-plasmonic-au-cu2-xse
#17
Yu Zou, Chao Sun, Wen-Bin Gong, Xianfeng Yang, Xin Huang, Ting Yang, Weibang Lu, Jiang Jiang
Integrating plasmonic metal and semiconductor at nanoscale is of great importance for exploring their optical coupling properties. However, synthesis and fine structural control of such nanostructures remain challenging. Herein we report facile aqueous phase Se-mediated overgrowth of metal selenides onto Au nanocrystals. Taking plasmonic Cu2-xSe as an example, the introduction of Se template allows deposition of large Cu2-xSe crystalline grains onto Au nanocrystal seeds in various shapes, including spheres, rods and plates...
April 10, 2017: ACS Nano
https://www.readbyqxmd.com/read/28377235/facile-green-synthesis-of-baicalein-fabricated-gold-nanoparticles-and-their-antibiofilm-activity-against-pseudomonas-aeruginosa-pao1
#18
Jobina Rajkumari, Siddhardha Busi, Aneesh Cherukunnel Vasu, Palarajasekhar Reddy
Biofilm formation is one of the major problems associated with chronic diseases and also attributes for the antibiotic resistance in bacteria. In recent times nanoparticles have been utilized to improve the efficacy of the existing antimicrobial and anti-biofilm agents. The ease in functionalization of gold nanoparticles (AuNPs) makes them a potential carrier for antimicrobial agents. However, the use of physical or chemical methods of the production of nanoparticles is expensive, labour intensive and hazardous to ecosystem...
April 2, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28372402/note-a-portable-rotating-waveplate-polarimeter
#19
Søren Bobach, Adnan Hidic, Jan J Arlt, Andrew J Hilliard
We describe the construction and performance of a polarimeter based on a quarter-wave plate rotated by a model airplane motor. The motor rotates at a high angular frequency of ω∼2π×160 Hz, which enables the polarimeter to monitor the polarization state of an incident beam of light in real-time. We show that a simple analysis of the polarimeter signal using the fast Fourier transform on a standard digital oscilloscope provides an excellent measure of the polarization state for many laboratory applications...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28372088/exactness-of-alternative-force-estimation-methods-and-applications-to-power-flow-and-transfer-path-analysis
#20
Akira Inoue
The alternative indirect methods to estimate interfacial force and moment are first given as theoretically exact methods which are derived from the equation of motion. How to directly acquire the F/Q (dynamic stiffness)-type frequency response functions and the blocked boundaries to apply are described in detail. As applications of interfacial force and moment, dissipated power exactly estimated by the total power or energy flows into a system and exactness of the transfer path analysis for structure-borne sound are described...
March 2017: Journal of the Acoustical Society of America
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