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https://www.readbyqxmd.com/read/28345923/geometry-and-topology-of-2d-dry-foams-computer-simulation-and-experimental-characterisation
#1
Mingming Tong, Katie Cole, Pablo R Brito-Parada, Stephen Johan Neethling, Jan J Cilliers
Pseudo-2D foams are commonly used in foam studies as it is experimentally easier to measure the bubble size distribution and other geometric and topological properties of these foams than it is for a 3D foam. Despite the widespread use of 2D foams in both simulation and experimental studies, many important geometric and topological relationships are still not well understood. Film size, for example, is a key parameter in the stability of bubbles and the overall structure of foams. The relationship between the size distribution of the films in a foam and that of the bubbles themselves is thus a key relationship in the modelling and simulation of unstable foams...
March 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28345911/subtle-microwave-induced-overheating-effects-in-an-industrial-de-methylation-reaction-and-their-direct-use-in-the-development-of-an-innovative-microwave-reactor
#2
Mario De Bruyn, Vitaliy L Budarin, Guido S J Sturm, Georgios D Stefanidis, Marilena Radoiu, Andrzej Stankiewicz, Duncan J Macquarrie
A systematic study of the conventional and microwave (MW) kinetics of an industrially relevant demethylation reaction is presented. In using industrially relevant reaction conditions the dominant influence of the solvent on the MW energy dissipation is avoided. Below the boiling point, the effect of MWs on the activation energy Ea and k0 is found non-existent. Interestingly under reflux conditions the microwave heated (MWH) reaction displays very pronounced zero order kinetics, displaying a much higher reaction rate than observed for the conventionally thermal heated (CTH) reaction...
March 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28345836/assessing-the-effect-of-waterpipe-smoking-on-cancer-outcome-a-systematic-review-of-current-evidence
#3
Kamran Habib Awan, Kamran Siddiqi, Shankargouda Patil, Quratul Ann Hussain
Background: Waterpipe smoking (WPS) is widely believed to be a safe and hazard-free tobacco habit. However, a number of studies have indicated that exposure to several toxicants and carcinogens through WPS is strongly related to serious health hazards. The current paper presents a narrative review on the effects of WPS on cancer outcome. Methods: The addressed focused question was “Is there an association between waterpipe smoking and cancer outcome?” PubMed, Medline, EMBASE, ISI Web of Science and the Cochrane databases were searched until June 2015 using the key words “Waterpipe”, “Hookah”, “Narghileh”, “Shisha”, “Hubbly Bubbly” “cancer” in various combinations...
February 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28345566/intraoperative-optical-coherence-tomography-in-anterior-segment-surgeries
#4
Jeewan S Titiyal, Manpreet Kaur, Ruchita Falera
Intraoperative optical coherence tomography (iOCT) is a noninvasive imaging modality that provides a real-time dynamic feedback of the various surgical steps. Comprehensive literature search was performed in MEDLINE using "intraoperative optical coherence tomography" and "iOCT" as keywords. The use of iOCT as an aid to decision-making has been successfully reported in cases undergoing keratoplasty, implantable Collamer lens (ICL) implantation as well as cataract surgery. iOCT helps to assess the graft-host relationship in penetrating keratoplasty...
February 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28344384/ferroelectric-switching-and-electrochemistry-of-pyrrole-substituted-trialkylbenzene-1-3-5-tricarboxamides
#5
Xiao Meng, Andrey V Gorbunov, W S Christian Roelofs, Stefan C J Meskers, René A J Janssen, Martijn Kemerink, Rint P Sijbesma
We explore a new approach to organic ferroelectric diodes using a benzene-tricarboxamide (BTA) core connected with C10 alkyl chains to pyrrole groups, which can be polymerized to provide a semiconducting ferroelectric material. The compound possesses a columnar hexagonal liquid crystalline (LC) phase and exhibits ferroelectric switching. At low switching frequencies, an additional process occurs, which leads to a high hysteretic charge density of up to ∼1000 mC/m(2). Based on its slow rate, the formation of gas bubbles, and the emergence of characteristic polypyrrole absorption bands in the UV-Vis-NIR, the additional process is identified as the oxidative polymerization of pyrrole groups, enabled by the presence of amide groups...
April 1, 2017: Journal of Polymer Science. Part B, Polymer Physics
https://www.readbyqxmd.com/read/28341584/development-of-videogrammetry-as-a-tool-for-gas-particle-fluidization-research
#6
S Anweiler
Many industries use fluidization of solid particles for energy efficiency or environmental friendly process development, and this paper introduces research techniques developed for investigating gas-particle systems At present there is plenty of room for refining gas-particle fluidization process. With the rapidly rising application of mathematical modelling, real time visualization of processes will be widely used for validation of those models in the near future. In presented research, photogrammetry, as a part of close range vision metrology, has been expanded to allow dynamic space and time analysis of the phase concentration distribution inside fluidization devices...
March 21, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28340783/automated-sugaring-out-liquid-liquid-extraction-based-on-flow-system-coupled-with-hplc-uv-for-the-determination-of-procainamide-in-urine
#7
Lawrence Nugbienyo, Yulia Malinina, Sergei Garmonov, Mikhail Kamencev, Ilgiz Salahov, Vasil Andruch, Leonid Moskvin, Andrey Bulatov
A fully automated sugaring-out assisted liquid-liquid extraction procedure was suggested. The procedure was based on the separation of the acetonitrile phase, containing a target analyte from the homogeneous sample solution after injection of sugaring-out reagent (glucose) into a mixing chamber of the flow system. Air bubbling was used to promote the extraction process and phase separation. After the fast phase separation in the mixing chamber, the acetonitrile phase containing the target analyte was transferred to an HPLC-UV system...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340774/rapid-micromotor-based-naked-eye-immunoassay
#8
Berta Esteban-Fernández de Ávila, Mingjiao Zhao, Susana Campuzano, Francesco Ricci, José M Pingarrón, Marcello Mascini, Joseph Wang
A dynamic micromotor-based immunoassay, exemplified by cortisol detection, based on the use of tubular micromotors functionalized with a specific antibody is described. The use of antibody-functionalized micromotors offers huge acceleration of both direct and competitive cortisol immunoassays, along with greatly enhanced sensitivity of direct and competitive immunoassays. The dramatically improved speed and sensitivity reflect the greatly increased likelihood of antibody-cortisol contacts and fluid mixing associated with the dynamic movement of these microtube motors and corresponding bubble generation that lead to a highly efficient and rapid recognition process...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340452/a-study-of-photosynthetic-biogas-upgrading-based-on-a-high-rate-algal-pond-under-alkaline-conditions-influence-of-the-illumination-regime
#9
Mariana Franco-Morgado, Cynthia Alcántara, Adalberto Noyola, Raúl Muñoz, Armando González-Sánchez
Microalgal-bacterial processes have emerged as environmental friendly systems for the cost-effective treatment of anaerobic effluents such as biogas and nutrients-laden digestates. Environmental parameters such as temperature, irradiation, nutrient concentration and pH effect the performance of the systems. In this paper, the potential of a microalgal-bacterial photobioreactor operated under high pH (≈9.5) and high alkalinity to convert biogas into biomethane was evaluated. The influence of the illumination regime (continuous light supply vs 12h/12h light/dark cycles) on the synthetic biogas upgrading efficiency, biomass productivity and nutrient removal efficiency was assessed in a High-Rate Algal Pond interconnected to a biogas absorption bubble column...
March 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28338731/purification-and-enzymatic-characterization-of-gallus-gallus-blm-helicase
#10
Jing Shi, Na-Nv Liu, Yan-Tao Yang, Xu-Guang Xi
Mutations in human BLM helicase give rise to the autosomal recessive Bloom syndrome, which shows high predisposition to types of malignant tumours. Though lots of biochemical and structural investigations have shed lights on the helicase core, structural investigations of the whole BLM protein are still limited due to its low stability and production. Here by comparing with the expression systems and functions of other BLM homologues, we developed the heterologous high-level expression and high-yield purification systems for Gallus gallus BLM (gBLM) in Escherichia coli...
February 21, 2017: Journal of Biochemistry
https://www.readbyqxmd.com/read/28338698/thermally-driven-bubble-evolution-at-a-heater-wire-in-water-characterized-by-high-speed-transmission-electron-microscopy
#11
J R Vance, S J Dillon
This work investigates the early stage evolution of thermally nucleated microbubbles in water using in situ high-speed, 400 fps, transmission electron microscopy. A Pt wire Joule heater induced bubble nucleation and growth from air-saturated water at different levels of power. For all powers below Pt breakdown, the dissolved gas initiates bubble nucleation at the concave surface defects adjacent to the area of highest temperature. A combination of interfacial forces and stress relaxation drive rapid migration of the bubbles away from the nucleation site...
March 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28337067/late-spontaneous-resolution-of-a-double-anterior-chamber-post-deep-anterior-lamellar-keratoplasty
#12
Andrea Passani, Angela Tindara Sframeli, Pasquale Loiudice, Marco Nardi
A 31-year-old healthy male underwent deep anterior lamellar keratoplasty with big-bubble technique for treatment of keratoconus in his right eye. One week after surgery, he presented with detachment of the endothelium-Descemet complex with formation of a double anterior chamber, despite the apparent absence of an intraoperative Descemet membrane rupture. A subsequent intervention with the intent to relocate the corneal graft button was not effective, because the detachment appeared again one day later. The authors hypothesized that, at the time of the stromal dissection with big bubble technique, a small amount of air penetrated into the anterior chamber, creating a false pathway through the trabecular meshwork...
January 2017: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28336542/seten-a-tool-for-systematic-identification-and-comparison-of-processes-phenotypes-and-diseases-associated-with-rna-binding-proteins-from-condition-specific-clip-seq-profiles
#13
Gungor Budak, Rajneesh Srivastava, Sarath Chandra Janga
RNA-binding proteins (RBPs) control the regulation of gene expression in eukaryotic genomes at post-transcriptional level by binding to their cognate RNAs. Although several variants of CLIP (crosslinking and immunoprecipitation) protocols are currently available to study the global protein-RNA interaction landscape at single nucleotide resolution in a cell, currently there are very few tools which can facilitate understanding and dissecting the functional associations of RBPs from the resulting binding maps...
March 23, 2017: RNA
https://www.readbyqxmd.com/read/28336058/large-9-mm-deep-anterior-lamellar-keratoplasty-with-clearance-of-a-6-mm-optical-zone-optimizes-outcomes-of-keratoconus-surgery
#14
Massimo Busin, Pia Leon, Yoav Nahum, Vincenzo Scorcia
PURPOSE: To evaluate the outcomes of a 9-mm deep anterior lamellar keratoplasty (DALK) with removal of the deep stroma limited to the central 6-mm optical zone. DESIGN: Prospective, noncomparative, interventional case series. PARTICIPANTS: A total of 80 consecutive keratoconic eyes without deep stromal scarring, with at least 1 postoperative examination 1 month after complete suture removal. INTERVENTION: A standardized DALK was performed, including (1) deep trephination of the recipient bed 450 to 550 μm in depth and 9 mm in diameter; (2) pneumatic dissection; (3) debulking of approximately 80% of the anterior stroma; (4) removal of the deep stroma (bubble roof) from a central 6-mm optical zone; and (5) transplantation of a 9-mm anterior corneal lamella cut by microkeratome-assisted dissection (400-μm head) and sutured with a double running 10-0 nylon suture...
March 20, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28334870/annealing-helicase-harp-closes-rpa-stabilized-dna-bubbles-non-processively
#15
Daniel R Burnham, Bas Nijholt, Iwijn De Vlaminck, Jinhua Quan, Timur Yusufzai, Cees Dekker
We investigate the mechanistic nature of the Snf2 family protein HARP, mutations of which are responsible for Schimke immuno-osseous dysplasia. Using a single-molecule magnetic tweezers assay, we construct RPA-stabilized DNA bubbles within torsionally constrained DNA to investigate the annealing action of HARP on a physiologically relevant substrate. We find that HARP closes RPA-stabilized bubbles in a slow reaction, taking on the order of tens of minutes for ∼600 bp of DNA to be re-annealed. The data indicate that DNA re-anneals through the removal of RPA, which is observed as clear steps in the bubble-closing traces...
February 28, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334635/ultrasonic-subwavelength-phase-conjugated-mirror-with-a-layer-of-bubbles
#16
O Lombard, C Barrière, V Leroy
A single layer of gas bubbles in a yield-stress fluid is experimentally shown to behave as a phase-conjugated (PC) mirror with a thickness 250 times smaller than the wavelength (0.14mm-diameter bubbles for phase-conjugation at 40kHz). A high amplitude pump wave at frequency 80kHz interacts with a lower amplitude probe wave centered at 40kHz. A PC-reflection coefficient of 0.15 is obtained for a 50kPa pump. A perturbative second-order theory is shown to quantitatively describe the experimental observations.
March 15, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28333441/direct-chemical-vapor-deposition-growth-and-band-gap-characterization-of-mos2-h-bn-van-der-waals-heterostructures-on-au-foils
#17
Zhepeng Zhang, Xujing Ji, Jianping Shi, Xiebo Zhou, Shuai Zhang, Yue Hou, Yue Qi, Qiyi Fang, Qingqing Ji, Yu Zhang, Min Hong, Pengfei Yang, Xinfeng Liu, Qing Zhang, Lei Liao, Chuanhong Jin, Zhongfan Liu, Yanfeng Zhang
Stacked transition-metal dichalcogenides on hexagonal boron nitride (h-BN) are platforms for high-performance electronic devices. However, such vertical stacks are usually constructed by the layer-by-layer polymer-assisted transfer of mechanically exfoliated layers. This inevitably causes interfacial contamination and device performance degradation. Herein, we develop a two-step, low-pressure chemical vapor deposition synthetic strategy incorporating the direct growth of monolayer h-BN on Au foil with the subsequent growth of MoS2...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28333188/autologous-collagen-matrix-acm-lower-pole-support-with-a-supero-anterior-capsular-flap-in-secondary-subpectoral-breast-augmentation
#18
Paolo Montemurro, Mubashir Cheema, Per Hedén, Stefano Avvedimento, Mouchammed Agko, Alessandro Quattrini Li
Background: Secondary aesthetic breast surgery is a complex and challenging scenario. It requires the surgeon to identify contributing factors, provide patient education, make a further management plan, and optimize the conditions for a favorable result. Various techniques have been described in literature but the rate of reoperation is still high. The first author has been using a supero-anterior capsular flap with a neopectoral subcapsular pocket and an implant change in these cases...
January 27, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28333173/functional-and-volumetric-analysis-of-the-pectoralis-major-muscle-after-submuscular-breast-augmentation
#19
Ana Claudia Roxo, Fabio Xerfan Nahas, Nadia Cristina Pinheiro Rodrigues, José Inácio Salles, Victor Rodrigues Amaral Cossich, Claudio Cardoso de Castro, Jose Horacio Aboudib, Ruy Garcia Marques
Background: Dual plane breast augmentation is a technical variation of the submuscular plane described as a technique that reduces contour deformities due to contraction of the pectoralis major muscle and lower risk of double-bubble deformity associated with breast ptosis. Despite improvement in the aesthetic aspect, there is still no consensus whether this technique affects the function of the pectoralis major muscle. Objectives: The aim of this study was to correlate functional with volumetric changes associated with dissection of the muscle origin in submuscular breast augmentation...
January 20, 2017: Aesthetic Surgery Journal
https://www.readbyqxmd.com/read/28332923/different-types-of-pausing-modes-during-transcription-initiation
#20
Eitan Lerner, Antonino Ingargiola, Jookyung J Lee, Sergei Borukhov, Xavier Michalet, Shimon Weiss
In many cases, initiation is rate limiting to transcription. This due in part to the multiple cycles of abortive transcription that delay promoter escape and the transition from initiation to elongation. Pausing of transcription in initiation can further delay promoter escape. The previously hypothesized pausing in initiation was confirmed by two recent studies from Duchi et al. (1) and from Lerner, Chung et al. (2) In both studies, pausing is attributed to lack of forward translocation of the nascent transcript during initiation...
March 23, 2017: Transcription
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