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https://www.readbyqxmd.com/read/28731319/few-layered-mo-1-x-wxs2-hollow-nanospheres-on-ni3s2-nanorods-heterostructure-as-robust-electrocatalysts-for-overall-water-splitting
#1
Meiyong Zheng, Jing Du, Baopu Hou, Cai-Ling Xu
Owing to the unique optical, electronic and catalytic properties, MoS2 have received increasing interests in electrochemical water splitting. Herein, few-layered Mo(1-x)WxS2 hollow nanospheres modified Ni3S2 heterostructures are prepared through a facile hydrothermal method to further enhance the electro-catalytic performance of MoS2. The doping of W element optimizes the electronic structure of MoS2@Ni3S2, thus improves the conductivity and charge transfer ability of MoS2@Ni3S2. In addition, benefiting from the few-layered hollow structure of Mo(1-x)WxS2, the strong electronic interactions between Mo(1-x)WxS2 and Ni3S2, and the hierarchical structure of 1D nanorods and 3D Ni foam, massive active sites and fast ion and charge transportion are obtained...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28727630/same-day-versus-split-dose-bowel-preparation-before-colonoscopy-a-meta-analysis
#2
Yuan-Lung Cheng, Kuang-Wei Huang, Wei-Chih Liao, Jiing-Chyuan Luo, Keng-Hsin Lan, Chien-Wei Su, Yuan-Jen Wang, Ming-Chih Hou
BACKGROUND: Split-dose regimens (SpDs) were recommended as a first choice for bowel preparation, whereas same-day regimens (SaDs) were recommended as an alternative; however, randomized trials compared them with mixed results. The meta-analysis was aimed at clarifying efficacy level between the 2 regimens. MATERIALS AND METHODS: We used MEDLINE/PubMed, EMBASE, Scopus, CINAHL, Cochrane Library, and Web of Science to identify randomized trials published from 1990 to 2016, comparing SaDs to SpDs in adults...
July 19, 2017: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/28727629/an-automated-inpatient-split-dose-bowel-preparation-system-improves-colonoscopy-quality-and-reduces-repeat-procedures
#3
Rena Yadlapati, Elyse R Johnston, Adam B Gluskin, Dyanna L Gregory, Rachel Cyrus, Lindsay Werth, Jody D Ciolino, David P Grande, Rajesh N Keswani
BACKGROUND/GOALS: Inpatient colonoscopy preparations are often inadequate, compromising patient safety and procedure quality, while resulting in greater hospital costs. The aims of this study were to: (1) design and implement an electronic inpatient split-dose bowel preparation order set; (2) assess the intervention's impact upon preparation adequacy, repeated colonoscopies, hospital days, and costs. STUDY: We conducted a single center prospective pragmatic quasiexperimental study of hospitalized adults undergoing colonoscopy...
July 19, 2017: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/28723150/double-imaging-photoelectron-photoion-coincidence-sheds-new-light-on-the-dissociation-of-state-selected-ch3f-ions
#4
Xiaofeng Tang, Gustavo A Garcia, Laurent Nahon
The vacuum ultraviolet (VUV) photoionization and dissociative photoionization of methyl fluoride (CH3F) in the 12.2-19.8 eV energy range were investigated by using synchrotron radiation coupled to a double imaging photoelectron photoion coincidence (i(2)PEPICO) spectrometer. The production of several fragment ions including CH2F(+), CHF(+), CH3(+) and CH2(+) as a function of state and internal energy of CH3F(+) ions was identified and analyzed, with their individual appearance energies measured through threshold photoelectron spectroscopy...
July 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28720879/microwave-tunable-metamaterial-based-on-semiconductor-to-metal-phase-transition
#5
Guanqiao Zhang, He Ma, Chuwen Lan, Rui Gao, Ji Zhou
A microwave tunable metamaterial utilizing the semiconductor-to-metal transition of vanadium dioxide (VO2) is proposed, experimentally demonstrated and theoretically scrutinized. Basic concept of the design involves the combination of temperature-dependent hysteresis in VO2 with resonance induced heating, resulting in a nonlinear response to power input. A lithographically prepared gold split-rings resonator (SRR) array deposited with VO2 thin film is fabricated. Transmission spectra analysis shows a clear manifestation of nonlinearity, involving power-dependence of resonant frequency as well as transmitted intensity at both elevated and room temperature...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28719109/new-insight-into-magnetic-interaction-in-monodisperse-gd12fe14-metal-cluster
#6
Xiu-Ying Zheng, Hui Zhang, Zhenxing Wang, Pengxin Liu, Ming-Hao Du, Ying-Zi Han, Rong-Jia Wei, Zhongwen Ouyang, Xiang-Jian Kong, Gui-Lin Zhuang, La-Sheng Long, Lan-Sun Zheng
Largest Ln-Fe metal cluster of [Gd12Fe14(μ3-OH)12(μ4-OH)6(μ4-O)12(TEOA)6(CH3COO)16(H2O)8]*(CH3COO)2(CH3CN)2* (H2O)20 (1) and core-shell monodisperse metal cluster of 1a@SiO2 (1a = [Gd12Fe14(μ3-OH)12(μ4-OH)6(μ4-O)12(TEOA)6(CH3COO)16 (H2O)8]2+) were prepared. Experimental and theoretical studies on the magnetic properties of 1 and 1a@SiO2 reveal that encapsulation of one cluster into one silica nanosphere not only effectively decreases intermolecular magnetic interaction but also significantly increases the zero-field splitting effect of the outer layer Fe3+ ions...
July 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28714078/ternary-porous-cobalt-phosphoselenide-nanosheets-an-efficient-electrocatalyst-for-electrocatalytic-and-photoelectrochemical-water-splitting
#7
Yang Hou, Ming Qiu, Tao Zhang, Xiaodong Zhuang, Chang-Soo Kim, Chris Yuan, Xinliang Feng
Exploring efficient and earth-abundant electrocatalysts is of great importance for electrocatalytic and photoelectrochemical hydrogen production. This study demonstrates a novel ternary electrocatalyst of porous cobalt phosphoselenide nanosheets prepared by a combined hydrogenation and phosphation strategy. Benefiting from the enhanced electric conductivity and large surface area, the ternary nanosheets supported on electrochemically exfoliated graphene electrodes exhibit excellent catalytic activity and durability toward hydrogen evolution in alkali, achieving current densities of 10 and 20 mA cm(-2) at overpotentials of 150 and 180 mV, respectively, outperforming those reported for transition metal dichalcogenides and first-row transition metal pyrites catalysts...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28712635/efficacy-of-xp-endo-finisher-in-the-removal-of-triple-antibiotic-paste-from-immature-root-canals
#8
Dilek Turkaydin, Erhan Demir, Fatima Betul Basturk, Hesna Sazak Övecoglu
INTRODUCTION: The aim of this study was to evaluate and compare the effectiveness of the XP-Endo Finisher (FKG Dentaire, La Chaux-de-Fonds, Switzerland) with passive ultrasonic irrigation (PUI) and needle irrigation in the removal of triple antibiotic paste (TAP) from the straight immature root canals of extracted teeth. METHODS: Thirty-four freshly extracted single-rooted teeth were used. All canals were prepared up to the ProTaper F5 file (Dentsply Maillefer, Ballaigues, Switzerland)...
July 13, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28704474/dietary-hemoglobin-rescues-young-piglets-from-severe-iron-deficiency-anemia-duodenal-expression-profile-of-genes-involved-in-heme-iron-absorption
#9
Robert Staroń, Paweł Lipiński, Małgorzata Lenartowicz, Aleksandra Bednarz, Anna Gajowiak, Ewa Smuda, Wojciech Krzeptowski, Marek Pieszka, Tamara Korolonek, Iqbal Hamza, Dorine W Swinkels, Rachel P L Van Swelm, Rafał R Starzyński
Heme is an efficient source of iron in the diet, and heme preparations are used to prevent and cure iron deficiency anemia in humans and animals. However, the molecular mechanisms responsible for heme absorption remain only partially characterized. Here, we employed young iron-deficient piglets as a convenient animal model to determine the efficacy of oral heme iron supplementation and investigate the pathways of heme iron absorption. The use of bovine hemoglobin as a dietary source of heme iron was found to efficiently counteract the development of iron deficiency anemia in piglets, although it did not fully rebalance their iron status...
2017: PloS One
https://www.readbyqxmd.com/read/28704029/encapsulation-of-single-nanoparticle-in-fast-evaporating-micro-droplets-prevents-particle-agglomeration-in-nanocomposites
#10
Ming Pan, Xinjian Shi, Fengjiao Lyu, Ben Louis Levy-Wendt, Xiaolin Zheng, Sindy K Y Tang
This work describes the use of fast-evaporating micro-droplets to finely disperse nanoparticles (NPs) in a polymer matrix for the fabrication of nanocomposites. Agglomeration of particles is a key obstacle for broad applications of nanocomposites. The classical approach to ensure the dispersability of NPs is to modify the surface chemistry of NPs with ligands. The surface properties of NPs are inevitably altered, however. To overcome the trade-off between dispersability and surface-functionality of NPs, we develop a new approach by dispersing NPs in a volatile solvent followed by mixing with uncured polymer precursors to form micro-droplet emulsions...
July 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28698831/effectiveness-of-reverse-sural-artery-flap-in-the-management-of-wheel-spoke-injuries-of-the-heel
#11
Hafiz U Farooq, Rizwan Ishtiaq, Shabana Mehr, Sadia Ayub, Umer H Chaudhry, Anam Ashraf
OBJECTIVE: Soft tissue injuries at the level of lower extremities, plantar, and dorsal foot pose a surgical challenge for reconstructive surgeons. This kind of injury commonly occurs when lower limbs get stuck in between the spokes of the wheel. Reverse sural artery flap has been proven to be an effective option to cover such defects. The aim of this study is to analyze the demographic variables of affected individuals, technical aspects of reverse sural artery flap, quantify the effectiveness of reverse sural artery flap among various treatment options available, and to study the outcome of injury...
June 10, 2017: Curēus
https://www.readbyqxmd.com/read/28696007/comparison-of-conventional-cytology-and-surepath-in-split-thyroid-fine-needle-aspiration-materials
#12
D Sahin, D Yilmazbayhan, P Firat, U P Hacisalihoglu, S H Kirimlioglu, E Celenk, R Arslan
OBJECTIVE: The aim of the present study was to compare the cytomorphological features and cytopathological diagnoses in thyroid aspiration materials prepared by SurePath® (SP) and conventional cytology (CC). MATERIALS AND METHODS: Fine needle aspiration (FNA) materials from 180 thyroid nodules were divided into two groups to prepare three conventional smears and one SP slide. Twenty-nine cytomorphological features of thyroid lesions were compared in the CC and SP slides...
July 11, 2017: Cytopathology: Official Journal of the British Society for Clinical Cytology
https://www.readbyqxmd.com/read/28692744/graphene-composites-with-cobalt-sulfide-efficient-trifunctional-electrocatalysts-for-oxygen-reversible-catalysis-and-hydrogen-production-in-the-same-electrolyte
#13
Nan Wang, Ligui Li, Dengke Zhao, Xiongwu Kang, Zhenghua Tang, Shaowei Chen
Nitrogen and sulfur-codoped graphene composites with Co9 S8 (NS/rGO-Co) are synthesized by facile thermal annealing of graphene oxides with cobalt nitrate and thiourea in an ammonium atmosphere. Significantly, in 0.1 m KOH aqueous solution the best sample exhibits an oxygen evolution reaction (OER) activity that is superior to that of benchmark RuO2 catalysts, an oxygen reduction reaction (ORR) activity that is comparable to that of commercial Pt/C, and an overpotential of only -0.193 V to reach 10 mA cm(-2) for hydrogen evolution reaction (HER)...
July 10, 2017: Small
https://www.readbyqxmd.com/read/28686413/atomically-thin-layers-of-graphene-and-hexagonal-boron-nitride-made-by-solvent-exfoliation-of-their-phosphoric-acid-intercalation-compounds
#14
Nina I Kovtyukhova, Nestor Perea-Lopez, Mauricio Terrones, Thomas E Mallouk
The development of scalable and reliable techniques for the production of the atomically thin layers of graphene and hexagonal boron nitride (h-BN) in bulk quantities could make these materials a powerful platform for devices and composites that impact a wide variety of technologies. To date a number of practical exfoliation methods have been reported that are based on sonicating or stirring powdered graphite or h-BN in common solvents. However, the products of these experiments consist mainly of few-layer sheets and contain only a small fraction of monolayers...
July 7, 2017: ACS Nano
https://www.readbyqxmd.com/read/28679577/learning-through-debate-during-problem-based-learning-an-active-learning-strategy
#15
Sadaf Mumtaz, Rabia Latif
We explored medical student's views and perceptions of a series of debates conducted during problem-based learning (PBL) practiced as a part of the Spiral curriculum at the Imam Abdulrahman Bin Faisal University, Saudi Arabia. A series of debates were employed during PBL sessions for second-year female medical students, over the period 2014-2016. Each cohort of students was randomly split into 10 small PBL groups and exposed to weekly PBL activity. Within each group, the students were divided into a proposition half and an opposition half...
September 1, 2017: Advances in Physiology Education
https://www.readbyqxmd.com/read/28679382/ethnopharmacological-survey-of-home-remedies-used-for-treatment-of-hair-and-scalp-and-their-methods-of-preparation-in-the-west-bank-palestine
#16
Abdel Naser Zaid, Nidal Amin Jaradat, Ahmad Mustafa Eid, Hamzeh Al Zabadi, Abdulsalam Alkaiyat, Saja Adam Darwish
BACKGROUND: Natural products have many uses and purposes, including those linked to pharmaceutics and cosmetics. The aim of this study was to investigate the use of natural remedies for the treatment of hair and scalp disorders in the West Bank, Palestine. METHODS: An ethnopharmacological survey of herbal remedies and other natural products used in cosmetics and cosmeceuticals was carried out in the West Bank, Palestine. A questionnaire was distributed to 267 herbalists, traditional healers, hairdressers and rural dwellers...
July 5, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28678439/from-molecular-2fe-2se-precursor-to-fese2-acting-as-highly-efficient-electrocatalyst-for-overall-water-splitting
#17
Matthias Driess, Chakadola Panda, Prashanth Wilfried Menezes, Carsten Walter, Shenglai Yao, Matthias Miehlich, Vitaly Gutkin, Karsten Meyer
A highly active FeSe2 electrocatalyst for durable overall water-splitting has been prepared from a molecular 2Fe-2Se precursor. The as-synthesized FeSe2 was electrophoretically deposited on nickel foam and applied for both oxygen (OER) and hydrogen evolution reaction (HER) in alkaline media. When used as an oxygen-evolution electrode, merely 245 mV of overpotential was achieved at a current density of 10 mAcm-2, representing outstanding catalytic activity and stability due to the formation of Fe(OH)2/FeOOH active sites at the surface of FeSe2...
July 5, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28677977/synthesis-and-electronic-ground-state-properties-of-pyrrolyl-based-iron-pincer-complexes-revisited
#18
Nico Ehrlich, Markus Kreye, Dirk Baabe, Peter Schweyen, Matthias Freytag, Peter G Jones, Marc D Walter
The pyrrolyl-based iron pincer compounds [((tBu)PNP)FeCl] (1), [((tBu)PNP)FeN2] (2), and [((tBu)PNP)Fe(CO)2] (3) were prepared and structurally characterized. In addition, their electronic ground states were probed by various techniques including solid-state magnetic susceptibility and zero-field (57)Fe Mössbauer and X-band electron paramagnetic resonance spectroscopy. While the iron(II) starting material 1 adopts an intermediate-spin (S = 1) state, the iron(I) reduction products 2 and 3 exhibit a low-spin (S = (1)/2) ground state...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28675293/enhanced-photocarrier-separation-in-hierarchical-graphitic-c3n4-supported-cuins2-for-noble-metal-free-z-scheme-photocatalytic-water-splitting
#19
Xiaoxue Li, Keyu Xie, Long Song, Mengjia Zhao, Zhipan Zhang
The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in-situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water-splitting...
July 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28671221/a-new-preparation-of-a-bifunctional-crystalline-heterogeneous-copper-electrocatalyst-by-electrodeposition-using-a-robson-type-macrocyclic-dinuclear-copper-complex-for-efficient-hydrogen-and-oxygen-evolution-from-water
#20
Samit Majumder, Ashraf Abdel Haleem, Perumandla Nagaraju, Yoshinori Naruta
The development of low-cost, stable bifunctional electrocatalysts, which operate in the same electrolyte with a low overpotential for water splitting, including the oxygen evolution reaction and the hydrogen evolution reaction, remains an attractive prospect and a great challenge. In this study, a water soluble Robson-type macrocyclic dicopper(ii) complex has been used for the first time as a catalyst precursor for the generation of a copper-based bifunctional heterogeneous catalyst film, which can be used for both HER and OER at a near neutral pH...
July 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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