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https://www.readbyqxmd.com/read/29775306/mechanistic-study-on-water-splitting-reactions-by-small-silicon-clusters-si-3-x-x-si-be-mg-ca
#1
Tran Dieu Hang, Minh Tho Nguyen
(Abstract) Interaction, dissociation and dehydrogenation reactions of water monomer and dimer with pure and mixed tetrameric silicon clusters Si3X with X = Si, Be, Mg, Ca were investigated using high accuracy quantum chemical calculations. While geometries were optimized using the DFT/B3LYP functional with the aug-cc-pVTZ basis set, reaction energy profiles were constructed making use of the coupled-cluster theory with extrapolation to complete basis set, CCSD(T)/CBS. Cleavage of the O-H bond in water dimer is found to be more favored than that of water monomer in the reaction with Si4...
May 18, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29768839/layered-double-hydroxides-as-precursors-to-ti-4-doped-mgo-nanoparticles-with-tunable-band-gap
#2
Urvashi Sharma, P Jeevanandam
TixMg1-xO solid solutions with tunable band gap are potential candidates for various applications such as photocatalysis, water splitting, dielectrics, etc. Present study reports the synthesis of TixMg1-xO (x = 0.02 to 0.5) solid solution nanoparticles via a simple sol-gel method. First, layered double hydroxides (precursors) are produced by sol-gel method, which on calcination produce the TixMg1-xO solid solutions. The effect of concentration of titanium (introduced as titanium isopropoxide during the synthesis) on the optical properties of TixMg1-xO solid solution nanoparticles has been investigated...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768810/preparation-and-photocatalytic-hydrogen-production-of-pt-graphene-tio%C3%A2-composites-from-water-splitting
#3
Nhat-Thien Nguyen, Dan-Dan Zheng, Shiao-Shing Chen, Chang-Tang Chang
Hydrogen is considered as a promising energy source with its high energy yield, renewable, environment friendly properties. TiO2 modified with noble metal and nonmetal is widely used. In this study, Pt and graphene (GN) were used to modify TiO2 nanoparticles. GN/TiO2 (TG), Pt-TiO2 (PT), Pt-GN/TiO2 (PTG) was successfully synthesized by modified Hummers' method, alcohol thermal and photodeposition method, respectively. The characterizations of the synthesized catalysts by UV-vis/DRS, components analysis, XRD and TEM analysis were conducted...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29765486/use-of-hyaluronic-acid-based-biological-bilaminar-matrix-in-wound-bed-preparation-a-case-series
#4
Richard Simman, Walid Mari, Sara Younes, Michael Wilson
Objective: Hyalomatrix, a matrix that consists of esterified hyaluronic acid, covered with a removable, semipermeable silicone top layer, was used to generate granulation tissue in a series of 12 serious, surgical wounds of different etiologies. Methods: Many defects showed exposed muscle, tendons, and/or bone. After thorough debridement, the matrix was applied, in a number of cases, combined with negative pressure wound therapy. Results: All wounds developed granulation tissue in and on top of the matrix. Nine wounds were then closed with a split skin autograft...
2018: Eplasty
https://www.readbyqxmd.com/read/29763822/construction-of-novel-sr-0-4-h-1-2-nb-2-o-6-%C3%A2-h-2-o-g-c-3-n-4-heterojunction-with-enhanced-visible-light-photocatalytic-activity-for-hydrogen-evolution
#5
Wanxia Ma, Di Li, Baowei Wen, Xiaodong Ma, Deli Jiang, Min Chen
Construction of heterojunction is an effective strategy to conquer the severe charge carrier recombination limitation of single component g-C3 N4 photocatalyst. In the present work, novel heterojunctions composed of g-C3 N4 nanosheets and Sr0.4 H1.2 Nb2 O6 ·H2 O nanooctahedrons were constructed via a simple hydrothermal method. The as-prepared Sr0.4 H1.2 Nb2 O6 ·H2 O/g-C3 N4 (HSN/CN) heterojunction showed high photocatalytic activity in the water splitting reactions. Specially, it is found that the developed 20 wt%-HSN/CN heterojunction shows high water splitting activity with H2 evolution rate up to 469...
May 12, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29761502/efficacy-of-tunnel-technique-in-the-treatment-of-localized-and-multiple-gingival-recessions-a-systematic-review-and-a-meta-analysis
#6
REVIEW
Lorenzo Tavelli, Shayan Barootchi, Trang V N Nguyen, Mustafa Tattan, Andrea Ravidà, Hom-Lay Wang
BACKGROUND: Tunnel technique (TUN) has recently gained popularity among clinicians for its promising clinical and esthetic results when treating gingival recessions (GRs) defects. However, the evidence of the efficacy of TUN in the literature is still to be determined. Therefore, the aim of the present systematic review and meta-analysis was to investigate the predictability of TUN and its comparison to coronally advanced flap (CAF) procedure. MATERIAL AND METHODS: A literature search on PubMed, Cochrane libraries, EMBASE, and hand-searched journals until November 2017 was conducted to identify clinical studies investigating TUN for root coverage procedures...
May 14, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/29749097/bimetallic-zn-fe-polyphthalocyanine-derived-single-atom-fe-n4-catalytic-site%C3%AF-a-superior-tri-functional-catalyst-for-overall-water-splitting-and-zn-air-battery
#7
Yuan Pan, Shoujie Liu, Kaian Sun, Xin Chen, Bin Wang, Konglin Wu, Xing Cao, Weng-Chon Cheong, Rongan Shen, Aijuan Han, Zheng Chen, Lirong Zheng, Jun Luo, Yan Lin, Yunqi Liu, Dingsheng Wang, Qiang Zhang, Chen Chen, Yadong Li
Developing an efficient single-atom materials (SAMs) synthesis methodology and exploring the energy-related catalytic reaction are important but still challenging. Herein, we report a novel polymerization-pyrolysis-evaporation (PPE) strategy to synthesize N-doped porous carbon (NPC) anchored atomically dispersed Fe-N4 catalytic site derived from predesigned bimetallic Zn/Fe polyphthalocyanine. Experiments and theory calculations demonstrate the formed Fe-N4 site exhibits superior tri-functional electrocatalytic performance for oxygen reduction, oxygen evolution and hydrogen evolution reactions...
May 11, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29743843/prospective-analysis-of-factors-associated-with-inadequate-bowel-preparation-for-colonoscopy-in-actual-clinical-practice
#8
Dae Hyung Woo, Kyeong Ok Kim, Da Eun Jeong, Yoon Jeong Nam, Si Hyung Lee, Byung Ik Jang, Tae Nyeun Kim
Background/Aims: Inadequate bowel preparation can result in prolonged procedure time and increased missed lesion and complication rates. This prospective study aimed to evaluate bowel preparation quality and identify the predictive factors for inadequate bowel preparation in actual clinical practice. Methods: We included 399 patients who underwent colonoscopy between June 2015 and July 2016. Using the Aronchick bowel preparation scale, we defined a score ≤2 as adequate preparation and a score >2 as inadequate preparation...
April 2018: Intestinal Research
https://www.readbyqxmd.com/read/29737988/an-investigation-on-the-role-of-w-doping-in-bivo-4-photoanodes-used-for-solar-water-splitting
#9
Xin Zhao, Jun Hu, Shi Chen, Zhong Chen
n-Type doping has been widely employed to enhance the performance of a photoanode in a photoelectrochemical cell used for water splitting. However, little is known about how doping affects the catalytic activity during surface catalysis. Herein, we took BiVO4 as an example to investigate the effect of doping on surface catalysis from both experimental and theoretical perspectives. To enable an impartial comparison, we have prepared planar BiVO4 thin films with and without W doping. It was found that W doping had no obvious effect on the morphology, crystallinity, and light absorption of the film; however, the photocurrent was significantly enhanced upon W doping...
May 16, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29736830/comparison-of-small-versus-large-volume-split-dose-preparation-for-colonoscopy-a-study-of-colonoscopy-outcomes
#10
Hassan Siddiki, Sreya Ravi, Mohanad T Al-Qaisi, Ayman R Fath, Francisco Ramirez, Michael D Crowell, Rahul Pannala, Douglas O Faigel, Suryakanth R Gurudu
BACKGROUND: Split dose bowel preparations (SDP) have superior outcomes for colonoscopy as compared to evening before regimens. However, the association of the actual volume of the SDP to colonoscopy outcome measures has not been well studied. AIMS: Compare adenoma detection rate (ADR), sessile serrated polyp detection rate (SDR), mean bowel cleanse score, and predictors of inadequate exams between small volume SDP and large volume SDP. METHODS: We have conducted a retrospective study in patients undergoing colonoscopy with small volume SDP versus large volume SDP between July 2014 and December 2014...
May 7, 2018: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29736520/ni-nanotube-array-based-electrodes-by-electrochemical-alloying-and-de-alloying-for-efficient-water-splitting
#11
Xue Teng, Jianying Wang, Lvlv Ji, Yaokang Lv, Zuofeng Chen
The design of cost-efficient earth-abundant catalysts with superior performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is extremely important for future renewable energy production. Herein, we report a facile strategy for constructing Ni nanotube arrays (NTAs) on a Ni foam (NF) substrate through cathodic deposition of NiCu alloy followed by anodic stripping of metallic Cu. Based on Ni NTAs, the as-prepared NiSe2 NTA electrode by NiSe2 electrodeposition and the NiFeOx NTA electrode by dipping in Fe3+ solution exhibit excellent HER and OER performance in alkaline conditions...
May 8, 2018: Nanoscale
https://www.readbyqxmd.com/read/29727170/double-indirect-interlayer-exciton-in-a-mose-2-wse-2-van-der-waals-heterostructure
#12
Aubrey T Hanbicki, Hsun-Jen Chuang, Matthew R Rosenberger, C Stephen Hellberg, Saujan V Sivaram, Kathleen M McCreary, Igor I Mazin, Berend T Jonker
An emerging class of semiconductor heterostructures involves stacking discrete monolayers such as the transition metal dichalcogenides (TMDs) to form van der Waals heterostructures. In these structures, it is possible to create interlayer excitons (ILEs), spatially indirect, bound electron-hole pairs with the electron in one TMD layer and the hole in an adjacent layer. We are able to clearly resolve two distinct emission peaks separated by 24 meV from an ILE in a MoSe2 /WSe2 heterostructure fabricated using state-of-the-art preparation techniques...
May 4, 2018: ACS Nano
https://www.readbyqxmd.com/read/29724535/does-fixation-method-affects-temporomandibular-joints-after-mandibular-advancement
#13
Erdogan Utku Ureturk, Aysegul Apaydin
PURPOSE: Sagittal split ramus osteotomy (SSRO) is a standard procedure in which miniplates and screws are used to achieve stabilization. Although the titanium plate and screw fixation system is stable, resorbable fixation systems are also used. There is currently no consensus on the ideal fixation technique for SSRO procedures and its effect on the condyle. We aimed to evaluate the stress distribution on temporomandibular joints (TMJ). METHODS: A 3D finite element model of a hemimandible was designed and 5 mm advancement was simulated on a computer model...
April 7, 2018: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29723810/long-noncoding-rnas-ac009014-3-and-newly-discovered-xplaid-differentiate-aggressive-and-indolent-prostate-cancers
#14
Anthony J Cesnik, Bing Yang, Andrew Truong, Tyler Etheridge, Michele Spiniello, Maisie I Steinbrink, Michael R Shortreed, Brian L Frey, David F Jarrard, Lloyd M Smith
INTRODUCTION: The molecular mechanisms underlying aggressive versus indolent disease are not fully understood. Recent research has implicated a class of molecules known as long noncoding RNAs (lncRNAs) in tumorigenesis and progression of cancer. Our objective was to discover lncRNAs that differentiate aggressive and indolent prostate cancers. METHODS: We analyzed paired tumor and normal tissues from six aggressive Gleason score (GS) 8-10 and six indolent GS 6 prostate cancers...
April 30, 2018: Translational Oncology
https://www.readbyqxmd.com/read/29720862/split-versus-single-dose-preparation-tolerability-in-a-multiethnic-population-decreased-side-effects-but-greater-social-barriers
#15
Gabriel Perreault, Adam Goodman, Sebastian Larion, Ahana Sen, Kirsten Quiles, Michael Poles, Renee Williams
Background: This study was performed to compare patient-reported tolerability and its barriers in single- vs. split-dose 4-L polyethylene glycol (PEG) bowel preparation for colonoscopy in a large multiethnic, safety-net patient population. Methods: A cross-sectional, dual-center study using a multi-language survey was used to collect patient-reported demographic, medical, socioeconomic, and tolerability data from patients undergoing outpatient colonoscopy. Univariate and multivariate analyses were used to identify demographic and clinical factors significantly associated with patient-reported bowel preparation tolerability...
May 2018: Annals of Gastroenterology: Quarterly Publication of the Hellenic Society of Gastroenterology
https://www.readbyqxmd.com/read/29720849/split-dose-bowel-preparation-versus-water-exchange-and-adenoma-detection-rate-have-we-arrived-there-yet
#16
EDITORIAL
Felix W Leung
No abstract text is available yet for this article.
May 2018: Annals of Gastroenterology: Quarterly Publication of the Hellenic Society of Gastroenterology
https://www.readbyqxmd.com/read/29705647/sample-preparation-procedure-using-extraction-and-derivatization-of-carboxylic-acids-from-aqueous-samples-by-means-of-deep-eutectic-solvents-for-gas-chromatographic-mass-spectrometric-analysis
#17
Patrycja Makoś, Andre Fernandes, Andrzej Przyjazny, Grzegorz Boczkaj
The paper presents a new procedure for the determination of organic acids in a complex aqueous matrix using ultrasound-assisted dispersive liquid-liquid microextraction followed by injection port derivatization and GC-MS analysis. A deep eutectic solvent (choline chloride: 4-methylphenol in a 1:2 mol ratio) was used both as an extracting solvent and as a derivatizing agent to yield ion pairs which were next converted to methyl esters of organic acids in a hot GC injection port. The procedure was optimized in terms of selection of a deep eutectic solvent, disperser solvent, and the ratio of their volumes, pH, salting out effect, extraction time, injection port temperature and time of opening the split valve...
April 24, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29705101/how-close-is-the-dose-manipulation-of-10mg-hydrocortisone-tablets-to-provide-appropriate-doses-to-children
#18
Cameron Watson, Emma A Webb, Stephanie Kerr, Justin H Davies, Heather Stirling, Hannah Batchelor
This study explores the methodology advised by healthcare professionals and the methods used by parents/carers to identify whether there is a best practice method for manipulation of 10mg hydrocortisone tablets to provide an accurate dose to children. Bespoke surveys were used to identify methods recommended and used in manipulation of tablets. Hydrocortisone tablets were manipulated to provide a specified dose by both naïve participants and parents/carers. The accuracy of manipulation was assessed using HPLC analysis...
April 26, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29700263/entanglement-between-two-spatially-separated-atomic-modes
#19
Karsten Lange, Jan Peise, Bernd Lücke, Ilka Kruse, Giuseppe Vitagliano, Iagoba Apellaniz, Matthias Kleinmann, Géza Tóth, Carsten Klempt
Modern quantum technologies in the fields of quantum computing, quantum simulation, and quantum metrology require the creation and control of large ensembles of entangled particles. In ultracold ensembles of neutral atoms, nonclassical states have been generated with mutual entanglement among thousands of particles. The entanglement generation relies on the fundamental particle-exchange symmetry in ensembles of identical particles, which lacks the standard notion of entanglement between clearly definable subsystems...
April 27, 2018: Science
https://www.readbyqxmd.com/read/29686374/publisher-correction-spin-controlled-atom-ion-chemistry
#20
Tomas Sikorsky, Ziv Meir, Ruti Ben-Shlomi, Nitzan Akerman, Roee Ozeri
The original version of this Article contained an error in the third sentence of the first paragraph of the 'Spin polarizing the Sr+ ion with ultracold atoms' section of the Results, which incorrectly read 'The Langevin collision rate is 1.' The correct version adds 'kHz' after '1.' The fifth sentence of this same paragraph originally read as "Although 87 Rb has a I = 3/2 nuclear spin and a hyperfine-split ground-state manifold, 88 Sr has no nuclear spin and a Zeeman split two-fold ground state", which is incorrect...
April 23, 2018: Nature Communications
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