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https://www.readbyqxmd.com/read/28203008/-effects-of-different-techniques-on-removal-of-vapor-lock-in-the-apical-region-of-curved-canals-a-cone-beam-computed-tomography-study
#1
Z Su, Y H Bai, X M Hou
OBJECTIVE: To compare the effect of four different techniques on removal of vapor lock in the apical region of curved root canals. METHODS: Forty simulated resin root canals with 45° curvature were prepared using WaveOne Primary, then the apical foramen were sealed with soft wax. The teeth were divided randomly into 4 groups thereafter (n=10). Contract solution was injected into the canals using a 30 G side-vented needle and scanned with cone-beam CT (CBCT) to identify the volume of the vapor lock...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28183606/one-step-synthesis-self-assembly-and-bioimaging-applications-of-adenosine-triphosphate-containing-amphiphilies-with-aggregation-induced-emission-feature
#2
Zi Long, Meiying Liu, Liucheng Mao, Guangjian Zeng, Qiang Huang, Hongye Huang, Fengjie Deng, Yiqun Wan, Xiaoyong Zhang, Yen Wei
Amphiphilic molecules with aggregation-induced emission (AIE) characteristics have attracted intensive interest for biological imaging applications for their self-assembly into nanostructures and obvious enhanced fluorescence intensity in aqueous solution. Although many AIE-active fluorescent organic nanoparticles (FONs) have been fabricated recently, the direct linkage of hydrophilic small molecules and hydrophobic AIE dyes has rarely been reported. In this work, we reported a one-pot strategy for preparation of adenosine triphosphate (ATP) containing molecules that conjugated the amino group of ATP and aldehyde-terminated AIE dye (PhCHO) based on mercaptoacetic acid locking imine (MALI) reaction...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28170269/nanomechanical-characterization-of-micellar-surfactant-films-via-atomic-force-microscopy-at-a-graphite-surface
#3
Benjamin Locke Micklavzina, Shengwei Zhang, Hao He, Marjorie L Longo
In this work, we study the mechanical properties of sodium dodecylsulfate (SDS) and dodecylamine hydrochloride (DAH) micellar films at a graphite surface via atomic force microscopy (AFM). Breakthrough forces for these films were measured using silicon nitride cantilevers, and found to be 1.1 ±0.1 nN for a 10 mM DAH film and 3.0 ±0.3 nN for a 10 mM SDS film. For 10 mM SDS films, it was found that the addition of 1.5 mM of NaCl, Na2SO4, or MgCl2 produced a 50-70% increase in measured breakthrough force. Similar results were found for 10 mM DAH films when NaCl and MgCl2 were added...
February 7, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28147611/resonant-mode-characterisation-of-a-cylindrical-helmholtz-cavity-excited-by-a-shear-layer
#4
Gareth J Bennett, David B Stephens, Francisco Rodriguez Verdugo
This paper investigates the interaction between the shear-layer over a circular cavity with a relatively small opening and the flow-excited acoustic response of the volume within to shear-layer instability modes. Within the fluid-resonant category of cavity oscillation, most research has been conducted on rectangular geometries: generally restricted to longitudinal standing waves, or when cylindrical: to Helmholtz resonance. In practical situations, however, where the cavity is subject to a range of flow speeds, many different resonant mode types may be excited...
January 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28128340/ultrafast-nonlinear-optical-properties-of-thin-solid-dna-film-and-their-application-as-a-saturable-absorber-in-femtosecond-mode-locked-fiber-laser
#5
Reza Khazaeinezhad, Sahar Hosseinzadeh Kassani, Bjorn Paulson, Hwanseong Jeong, Jiyoon Gwak, Fabian Rotermund, Dong-Il Yeom, Kyunghwan Oh
A new extraordinary application of deoxyribonucleic acid (DNA) thin-solid-film was experimentally explored in the field of ultrafast nonlinear photonics. Optical transmission was investigated in both linear and nonlinear regimes for two types of DNA thin-solid-films made from DNA in aqueous solution and DNA-cetyltrimethylammonium chloride (CTMA) in an organic solvent. Z-scan measurements revealed a high third-order nonlinearity with n2 exceeding 10(-9) at a wavelength of 1570 nm, for a nonlinarity about five orders of magnitude larger than that of silica...
January 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28112099/performance-of-an-insect-inspired-target-tracker-in-natural-conditions
#6
Zahra M Bagheri, Steven D Wiederman, Benjamin S Cazzolato, Steven Grainger, David C O'Carroll
Robust and efficient target-tracking algorithms embedded on moving platforms, are a requirement for many computer vision and robotic applications. However, deployment of a real-time system is challenging, even with the computational power of modern hardware. As inspiration, we look to biological lightweight solutions-lightweight and low-powered flying insects. For example, dragonflies pursue prey and mates within cluttered, natural environments, deftly selecting their target amidst swarms. In our laboratory, we study the physiology and morphology of dragonfly 'small target motion detector' neurons likely to underlie this pursuit behaviour...
February 16, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28078825/ethanol-combined-with-heparin-as-a-locking-solution-for-the-prevention-of-catheter-related-blood-stream-infections-in-hemodialysis-patients-a-prospective-randomized-study
#7
Sofia Sofroniadou, Ioanna Revela, Alexandros Kouloubinis, Ioanna Makriniotou, Sinodi Zerbala, Despina Smirloglou, Petros Kalocheretis, Apostolos Drouzas, George Samonis, Christos Iatrou
Introduction Ethanol lock solution has been mainly administered in paediatric and home parenteral nutrition patients in order to prevent catheter related blood stream infections (CRBSI). Its utility in hemodialysis (HD) patients with non-tunneled-uncuffed catheter (NTC) has been poorly explored. Methods We conducted a prospective randomized study in chronic HD patients requiring a newly inserted NTC-while awaiting for the maturation of an already established arteriovenous fistula (AVF) or arteriovenous graft (AVG) or tunneled-cuffed catheter insertion...
January 11, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28074948/hot-electron-driven-photocatalytic-water-splitting
#8
Bingya Hou, Lang Shen, Haotian Shi, Rehan Kapadia, Stephen B Cronin
We report measurements of photocatalytic water splitting using Au films with and without TiO2 coatings. In these structures, a thin (3-10 nm) film of TiO2 is deposited using atomic layer deposition (ALD) on top of a 100 nm thick Au film. We utilize an AC lock-in technique, which enables us to detect the relatively small photocurrents (∼μA) produced by the short-lived hot electrons that are photoexcited in the metal. Under illumination, the bare Au film produces a small AC photocurrent (<1 μA) for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) due to hot electrons and hot holes, respectively, that are photoexcited in the Au film...
January 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28035620/does-antimicrobial-lock-solution-reduce-catheter-related-infections-in-hemodialysis-patients-with-central-venous-catheters-a-bayesian-network-meta-analysis
#9
Jun Zhang, Bo Wang, Rongke Li, Long Ge, Kee-Hsin Chen, Jinhui Tian
PURPOSE: The purpose of our study is to carry out a Bayesian network meta-analysis comparing the efficacy of different antimicrobial lock solutions (ALS) for prevention of catheter-related infections (CRI) in patients with hemodialysis (HD) and ranking these ALS for practical consideration. METHODS: We searched six electronic databases, earlier relevant meta-analysis and reference lists of included studies for randomized controlled trials (RCTs) that compared ALS for preventing episodes of CRI in patients with HD either head-to-head or against control interventions using non-ALS...
December 29, 2016: International Urology and Nephrology
https://www.readbyqxmd.com/read/28032021/detection-of-ligand-induced-conformational-changes-in-the-activation-loop-of-aurora-a-kinase-by-peldor-spectroscopy
#10
Selena G Burgess, Maria Grazia Concilio, Richard Bayliss, Alistair J Fielding
The structure of protein kinases has been extensively studied by protein crystallography. Conformational movement of the kinase activation loop is thought to be crucial for regulation of activity; however, in many cases the position of the activation loop in solution is unknown. Protein kinases are an important class of therapeutic target and kinase inhibitors are classified by their effect on the activation loop. Here, we report the use of pulsed electron double resonance (PELDOR) and site-directed spin labeling to monitor conformational changes through the insertion of MTSL [S-(1-oxyl-2,2,5,5-tetramethyl-2,5-dihydro-1 H-pyrrol-3-yl)methyl methanesulfonothioate] on the dynamic activation loop and a stable site on the outer surface of the enzyme...
December 2016: ChemistryOpen
https://www.readbyqxmd.com/read/28024627/fretting-corrosion-behavior-of-nitinol-spinal-rods-in-conjunction-with-titanium-pedicle-screws
#11
Elena Lukina, Mikhail Kollerov, Jay Meswania, Alla Khon, Pavel Panin, Gordon W Blunn
Untypical corrosion damage including erosions combined with the build-up of titanium oxide as a corrosion product on the surface of explanted Nitinol spinal rods in the areas where it was in contact with titanium pedicle screw head is reported. It was suggested that Nitinol rods might have inferior fretting corrosion resistance compared with that made of titanium or CoCr. Fretting corrosion of Nitinol spinal rods with titanium (Ti6Al4V) pedicle screws were tested in-vitro by conducting a series of potentiostatic measurements of the peak-to-peak values of fretting corrosion current under bending in a 10% solution of calf serum in PBS...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27999062/5-hydroxyethyl-3-tetradecanoyltetramic-acid-represents-a-novel-treatment-for-intravascular-catheter-infections-due-to-staphylococcus-aureus
#12
Marta Zapotoczna, Ewan J Murray, Siobhan Hogan, James P O'Gara, Siri R Chhabra, Weng C Chan, Eoghan O'Neill, Paul Williams
OBJECTIVES: Biofilm infections of intravascular catheters caused by Staphylococcus aureus may be treated with catheter lock solutions (CLSs). Here we investigated the antibacterial activity, cytotoxicity and CLS potential of 5-hydroxyethyl-3-tetradecanoyltetramic acid (5HE-C14-TMA) compared with the related compounds 3-tetradecanoyltetronic (C14-TOA) and 3-tetradecanoylthiotetronic (C14-TTA), which are variants of quorum sensing signalling molecules produced by Pseudomonas aeruginosa METHODS: Antibacterial activity and mechanism of action of 5HE-C14-TMA, C14-TOA and C14-TTA were determined via MIC, bacterial killing, membrane potential and permeability assays...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27993011/tale-of-twisted-molecules-atropselective-photoreactions-taming-light-induced-asymmetric-transformations-through-non-biaryl-atropisomers
#13
Elango Kumarasamy, Anoklase Jean-Luc Ayitou, Nandini Vallavoju, Ramya Raghunathan, Akila Iyer, Anthony Clay, Sunil Kumar Kandappa, Jayaraman Sivaguru
Photochemical transformations are a powerful tool in organic synthesis to access structurally complex and diverse synthetic building blocks. However, this great potential remains untapped in the mainstream synthetic community due to the challenges associated with stereocontrol originating from excited state(s). The finite lifetime of an excited state and nearly barrierless subsequent processes present significant challenges in manipulating the stereochemical outcome of a photochemical reaction. Several methodologies were developed to address this bottleneck including photoreactions in confined media and preorganization through noncovalent interactions resulting in stereoenhancement...
December 20, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27958492/two-dimensional-electronic-spectroscopy-in-the-ultraviolet-by-a-birefringent-delay-line
#14
Rocio Borrego-Varillas, Aurelio Oriana, Lucia Ganzer, Anton Trifonov, Ivan Buchvarov, Cristian Manzoni, Giulio Cerullo
We introduce a 2D electronic spectroscopy setup in the UV spectral range in the partially collinear pump-probe geometry. The required interferometrically phase-locked few-optical-cycle UV pulse pair is generated by combining a passive birefringent interferometer in the visible and nonlinear phase transfer. This is achieved by sum-frequency generation between the phase-locked visible pulse pair and narrowband infrared pulses. We demonstrate a pair of 16-fs, 330-nm pulses whose delay is interferometrically stable with an accuracy better than λ/450...
December 12, 2016: Optics Express
https://www.readbyqxmd.com/read/27918415/on-the-use-of-a-feedback-tracking-architecture-for-satellite-navigation-spoofing-detection
#15
Esteban Garbin Manfredini, Fabio Dovis
In this paper, the Extended Coupled Amplitude Delay Lock Loop (ECADLL) architecture, previously introduced as a solution able to deal with a multipath environment, is revisited and improved to tailor it to spoofing detection purposes. Exploiting a properly-defined decision algorithm, the architecture is able to effectively detect a spoofer attack, as well as distinguish it from other kinds of interference events. The new algorithm is used to classify them according to their characteristics. We also introduce the use of a ratio metric detector in order to reduce the detection latency and the computational load of the architecture...
December 2, 2016: Sensors
https://www.readbyqxmd.com/read/27916036/-effect-of-ultrasound-guided-patient-controlled-paravertebral-block-on-pulmonary-function-in-patients-with-multiple-fractured-ribs
#16
Y Y Ge, X Z Wang, N Yuan, L Y Yuan, W H Ma, Y Hu
Objective: To investigated the effects of patient controlled intravenous analgesia and ultrasound guided patient-controlled paravertebral block on pulmonary function in patients with multiple fractured ribs. Methods: From May 2015 to March 2016, 60 patients with multiple rib fractures in Ningbo NO.6 Hospital with American Society of Anesthesiologists Ⅱ-Ⅲ underwent internal fixation, including 30 males and 30 females aged from 16 to 70 years(mean age (54.6±15.2) years). All patients were randomly divided into 2 groups (n=30 each): patient controlled intravenous analgesia(PCIA) group and patient controlled thoracic paravertebral block(PCPB) group...
December 1, 2016: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/27906292/ultrafast-pulse-generation-in-a-mode-locked-erbium-chip-waveguide-laser
#17
Champak Khurmi, Nicolas Bourbeau Hébert, Wen Qi Zhang, Shahraam Afshar V, George Chen, Jérôme Genest, Tanya M Monro, David G Lancaster
We report mode-locked ~1550 nm output of transform-limited ~180 fs pulses from a large mode-area (diameter ~50 μm) guided-wave erbium fluorozirconate glass laser. The passively mode-locked oscillator generates pulses with 25 nm bandwidth at 156 MHz repetition rate and peak-power of 260 W. Scalability to higher repetition rate is demonstrated by transform-limited 410 fs pulse output at 1.3 GHz. To understand the origins of the broad spectral output, the laser cavity is simulated by using a numerical solution to the Ginzburg-Landau equation...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27901539/colloidal-molecules-assembled-from-binary-spheres-under-an-ac-electric-field
#18
Kelley Lynch Heatley, Fuduo Ma, Ning Wu
Colloidal particles are envisioned as analogues of atoms and molecules, however they often lack the complexities present in their counterparts. In this work, we report the assembly of colloidal molecules from a binary mixture of polystyrene spheres (1, 1.6, 2, and 4 μm) under an alternating current electric field. The rich family of assembled oligomers typically consists of a large sphere that is closely surrounded by a number of smaller petal particles, driven by the dipolar attraction between large and small particles...
November 30, 2016: Soft Matter
https://www.readbyqxmd.com/read/27883152/a-resettable-and-reprogrammable-biomolecular-keypad-lock-with-dual-outputs-based-on-glucose-oxidase-au-nanoclusters-prussian-blue-nanocomposite-films-on-an-electrode-surface
#19
Xue Yu, Menglu Li, Tianrui Li, Shuo Zhou, Hongyun Liu
In this work, electrochromic Prussian blue (PB) films were electrodeposited on the surface of indium tin oxide (ITO) electrodes, and a dispersion mixture of glucose oxidase (GOD), chitosan (CS) and gold nanoclusters (AuNCs) was then cast on the PB surface to form CS-AuNC-GOD/PB nanocomposite film electrodes. The blue PB component in the films could be changed into its colourless reduced form of Prussian white (PW) upon application of -0.2 V. The addition of glucose to the solution would produce H2O2 with the help of GOD in the films and oxygen in the solution, which could oxidize PW back to PB...
December 8, 2016: Nanoscale
https://www.readbyqxmd.com/read/27869838/analytical-comparison-of-pulses-generated-by-locking-three-and-five-longitudinal-modes-in-free-running-class-b-lasers
#20
Farzane Sharafi, Jafar Jahanpanah
We consider the coherent oscillation of five longitudinal modes, which leads to the coupling of modes in the frequency domain and generation of short pulses in the time domain. The aim is to audit the mechanism of mode locking in more detail by extending the analytical solution of the Maxwell-Bloch equations of motion from three to five mode states. The characteristics of pulses including height, repetition, and duration have been calculated for a five-mode class B laser, and the changes are compared with respect to the three-mode state...
November 20, 2016: Applied Optics
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