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https://www.readbyqxmd.com/read/28437954/microstructured-fbg-hydrogen-sensor-based-on-pt-loaded-wo-sub-3-sub
#1
Xian Zhou, Yutang Dai, Joseph Muna Karanja, Fufei Liu, Minghong Yang
Hydrogen gas sensing properties of Pt-WO<sub>3</sub> films on spiral microstructured fiber Bragg grating (FBG) has been demonstrated. Pt-WO<sub>3</sub> film was prepared by hydrothermal method. The spiral microsturctured FBG was fabricated using femtosecond laser. Spiral microstructure FBG hydrogen sensor can detect hydrogen concentration from 0.02% H<sub>2</sub> to 4% H<sub>2</sub> at room temperature, and the response time is shortened from a few minutes to 10~30 s...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437343/spinopelvic-alignment-by-different-surgical-methods-in-the-treatment-of-degenerative-sagittal-imbalance-of-the-lumbar-spine
#2
Dong-Gune Chang, Kee-Yong Ha, Young-Hoon Kim, Eun-Whan Lee
STUDY DESIGN: A retrospective comparative study. OBJECTIVE: To compare pedicle subtraction osteotomy (PSO) and iliac fixation (ILF) without osteotomy as methods of correcting lumbar spine deformities due to degenerative sagittal imbalance (DSI) through the evaluation of the changes in spinopelvic alignment. SUMMARY OF BACKGROUND DATA: Many papers have reported the surgical results after PSO and ILF for patients with fixed adult deformities...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28437256/electron-inelastic-mean-free-path-at-energies-below-100-ev
#3
Hieu T Nguyen-Truong
Knowledge of electron inelastic mean free paths (IMFPs) is important for electron spectroscopy and microscopy studies. Here, we determine the IMFPs at energies below 100 eV for 10 elemental solids (V, Fe, Ni, Mo, Pd, Ag, Ta, W, Pt, and Au) within the dielectric formalism, using the energy-loss function calculated in the adiabatic local-density approximation of time-dependent density-functional theory. The resulting IMFPs at a few eV above the Fermi energy are comparable to those from ab initio calculations in the GW approximation of many-body theory...
April 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28437086/the-skyrmion-switch-turning-magnetic-skyrmion-bubbles-on-and-off-with-an-electric-field
#4
Marine Schott, Anne Bernand-Mantel, Laurent Ranno, Stéfania Pizzini, Jan Vogel, Hélène Béa, Claire Baraduc, Stéphane Auffret, Gilles Gaudin, Dominique Givord
Nanoscale magnetic skyrmions are considered as potential information carriers for future spintronics memory and logic devices. Such applications will require the control of their local creation and annihilation, which involves so far solutions that are either energy consuming or difficult to integrate. Here we demonstrate the control of skyrmion bubbles nucleation and annihilation using electric field gating, an easily integrable and potentially energetically efficient solution. We present a detailed stability diagram of the skyrmion bubbles in a Pt/Co/oxide trilayer and show that their stability can be controlled via an applied electric field...
April 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28437070/large-scale-synthesis-of-carbon-shell-coated-fep-nanoparticles-for-robust-hydrogen-evolution-reaction-electrocatalyst
#5
Dong Young Chung, Samuel Woojoo Jun, Gabin Yoon, Hyunjoong Kim, Ji Mun Yoo, Kug-Seung Lee, Taehyun Kim, Heejong Shin, Arun Kumar Sinha, Soon Gu Kwon, Kisuk Kang, Taeghwan Hyeon, Yung-Eun Sung
Highly active and stable non-Pt electrocatalyst for hydrogen production has been pursed for a long time as alternative of expensive Pt catalyst. Herein we report a simple and effective approach to prepare highly stable iron phosphide (FeP) nanoparticle electrocatalyst using iron oxide nanoparticles as the precursor. A single step heating procedure of polydopamine-coated iron oxide nanoparticles leads to carbonization of dopamine coating to carbon shell and phosphidation of iron oxide to FeP, simultaneously...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28437068/observing-the-overgrowth-of-a-second-metal-on-silver-cubic-seeds-in-solution-by-surface-enhanced-raman-scattering
#6
Yun Zhang, Jingyue Liu, Jaewan Ahn, Ting-Hui Xiao, Zhi-Yuan Li, Dong Qin
We report the development of an isocyanide-based molecular probe for in situ characterizing the overgrowth of a second metal on silver nanocrystal seeds in solution by surface-enhanced Raman scattering (SERS). As the first demonstration, we elucidate that the vibrational frequency of 2,6-dimethylphenyl isocyanide (2,6-DMPI) can serve as a distinctive reporter for capturing the nucleation of Pt on the edges of Ag nanocubes in the aqueous solution containing a Pt precursor, ascorbic acid, and poly(vinylpyrrolidone) under ambient condition...
April 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28437022/-wiring-fe-nx-embedded-porous-carbon-framework-onto-1d-nanotubes-for-efficient-oxygen-reduction-reaction-in-alkaline-and-acidic-media
#7
Sung Hoon Ahn, Xingwen Yu, Arumugam Manthiram
This study presents a novel metal-organic-framework-engaged synthesis route based on porous tellurium nanotubes as a sacrificial template for hierarchically porous 1D carbon nanotubes. Furthermore, an ultrathin Fe-ion-containing polydopamine layer has been introduced to generate highly effective FeNx C active sites into the carbon framework and to induce a high degree of graphitization. The synergistic effects between the hierarchically porous 1D carbon structure and the embedded FeNx C active sites in the carbon framework manifest in superior catalytic activity toward oxygen reduction reaction (ORR) compared to Pt/C catalyst in both alkaline and acidic media...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28436629/-hypoxia-inducible-factor-1%C3%AE-and-cd133-predicts-pathological-complete-response-and-survival-for-locally-advanced-rectal-cancer-patients-after-neoadjuvant-chemoradiotherapy
#8
Cheng Cai, Jianping Wang, Zhifeng Zhong, Zhihui Dai, Qinghua Wang, Wuzhen Dong, Hongqi Shi, Qingwei Liu, Jinlin DU
Objective: To investigate the expression of hypoxia-inducible factor 1α (HIF-1α) and CD133 in predicting pathologic remission and survival of patients with locally advanced rectal cancer undergoing neoadjuvant chemoradiotherapy. Methods: One hundred and fourteen patients with locally advanced rectal cancer undergoing neoadjuvant chemoradiotherapy from January 2010 to December 2015 in Jinhua Municipal Central Hospital were enrolled in the study. RT-PCR and immunohistochemistry methods were used to detect the mRNA and protein expression of HIF-1α and CD133 before and after chemoradiotherapy...
January 25, 2017: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28436612/effects-of-zero-point-vibration-on-the-reaction-dynamics-of-water-dimer-cations-following-ionization
#9
Hiroto Tachikawa
Reactions of water dimer cation (H2O)2+ following ionization have been investigated by means of a direct ab initio molecular dynamics method. In particular, the effects of zero point vibration and zero point energy (ZPE) on the reaction mechanism were considered in this work. Trajectories were run on two electronic potential energy surfaces (PESs) of (H2O)2+: ground state ((2) A″-like state) and the first excited state ((2) A'-like state). All trajectories on the ground-state PES lead to the proton-transferred product: H2 O(+) (Wd)-H2 O(Wa) → OH(Wd)-H3 O(+) (Wa), where Wd and Wa refer to the proton donor and acceptor water molecules, respectively...
April 24, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28436510/unique-structural-properties-of-dna-interstrand-cross-links-formed-by-a-new-antitumor-dinuclear-pt-ii-complex
#10
O Hrabina, J Kasparkova, T Suchankova, V Novohradsky, Z Guo, Viktor Brabec
The DNA interstrand cross-links of the antitumor drug {[cis-Pt(NH3)2Cl]2(4,4'-methylenedianiline)}(2+) (1) play a prevalent role in its antitumor effects. Complex 1 forms DNA long-range interstrand cross-links uniquely in the 3'-3' direction. Conformational distortions induced by these interstrand cross-links in DNA represent a potential structural motif for recognition by high-mobility-group proteins.
April 24, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28436494/platinum-nickel-alloy-excavated-nano-multipods-with-hexagonal-close-packed-structure-and-superior-activity-towards-hydrogen-evolution-reaction
#11
Zhenming Cao, Qiaoli Chen, Jiawei Zhang, Huiqi Li, Yaqi Jiang, Shouyu Shen, Gang Fu, Bang-An Lu, Zhaoxiong Xie, Lansun Zheng
Crystal phase regulations may endow materials with enhanced or new functionalities. However, syntheses of noble metal-based allomorphic nanomaterials are extremely difficult, and only a few successful examples have been found. Herein, we report the discovery of hexagonal close-packed Pt-Ni alloy, despite the fact that Pt-Ni alloys are typically crystallized in face-centred cubic structures. The hexagonal close-packed Pt-Ni alloy nano-multipods are synthesized via a facile one-pot solvothermal route, where the branches of nano-multipods take the shape of excavated hexagonal prisms assembled by six nanosheets of 2...
April 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28436223/interconnected-hierarchically-porous-fe-n-codoped-carbon-nanofibers-as-efficient-oxygen-reduction-catalysts-for-zn-air-batteries
#12
Yingxuan Zhao, Qingxue Lai, Ya Wang, Junjie Zhu, Yan Yu Liang
Developing porous carbon-based no-precious metal catalysts towards oxygen reduction reaction (ORR) is a suitable approach to significantly reduce the costs of fuel cells or metal-air batteries. Herein, interconnected hierarchically porous carbon nanofibers simultaneously doped with nitrogen and iron (HP-Fe-N/CNFs) were fabricated by facile pyrolysis of polypyrrole coated electrospun polystyrene/FeCl3 fibers. The obtained carbon nanofibers present high specific surface area (569.6 m2 g-1) and large pore volume (1...
April 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28435873/role-of-damping-in-spin-seebeck-effect-in-yttrium-iron-garnet-thin-films
#13
Houchen Chang, P A Praveen Janantha, Jinjun Ding, Tao Liu, Kevin Cline, Joseph N Gelfand, Wei Li, Mario C Marconi, Mingzhong Wu
The role of damping in the spin Seebeck effect (SSE) was studied experimentally for the first time. The experiments used Y3Fe5O12 (YIG)/Pt bilayered structures where the YIG films exhibit very similar structural and static magnetic properties but very different damping. The data show that a decrease in the damping gives rise to an increase in the SSE coefficient, which is qualitatively consistent with some of the theoretical models. This response also shows quasi-linear behavior, which was not predicted explicitly by previous studies...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28435863/bulk-layered-heterojunction-as-an-efficient-electrocatalyst-for-hydrogen-evolution
#14
Changdeuck Bae, Thi Anh Ho, Hyunchul Kim, Seonhee Lee, Seulky Lim, Myungjun Kim, Hyunjun Yoo, Josep M Montero-Moreno, Jong Hyeok Park, Hyunjung Shin
We describe the spontaneous formation of composite chalcogenide materials that consist of two-dimensional (2D) materials dispersed in bulk and their unusual charge transport properties for application in hydrogen evolution reactions (HERs). When MoS2 as a representative 2D material is deposited on transition metals (such as Cu) in a controlled manner, the sulfidation reactions also occur with the metal. This process results in remarkably unique structures, that is, bulk layered heterojunctions (BLHJs) of Cu-Mo-S that contain MoS2 flakes inside, which are uniformly dispersed in the Cu2S matrix...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28435780/highly-active-and-stable-pt-pd-alloy-catalysts-synthesized-by-room-temperature-electron-reduction-for-oxygen-reduction-reaction
#15
Wei Wang, Zongyuan Wang, Jiajun Wang, Chuan-Jian Zhong, Chang-Jun Liu
Carbon-supported platinum (Pt) and palladium (Pd) alloy catalyst has become a promising alternative electrocatalyst for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. In this work, the synthesis of highly active and stable carbon-supported Pt-Pd alloy catalysts is reported with a room-temperature electron reduction method. The alloy nanoparticles thus prepared show a particle size around 2.6 nm and a core-shell structure with Pt as the shell. With this structure, the breaking of O-O bands and desorption of OH are both promoted in electrocatalysis of ORR...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28435724/crystal-structures-of-two-platinum-ii-complexes-containing-ethyl-eugenoxyacetate-and-2-amino-pyridine
#16
Hai Le Thi Hong, Thao Nguyen Thu, Hien Nguyen, Luc Van Meervelt
In the title complexes, trans-(2-amino-pyridine-κN)di-chlorido-{4-eth-oxy-carbonyl-meth-oxy-3-meth-oxy-1-[(2,3-η)-prop-2-en-1-yl]benzene}-platinum(II), [PtCl2(C5H6N2)(C14H18O4)], (I), and (2-amino-pyridine-κN)chlorido{5-eth-oxy-car-bon-yl-meth-oxy-4-meth-oxy-1-[(2,3-η)-prop-2-en-1-yl]phenyl-κC(1)}-platinum(II), [Pt(C14H17O4)Cl(C5H6N2)], (II), the central Pt(II) metal atom displays a distorted square-planar coordination, with the Pt(II) atom coordinated by the pyridine N atom, the C=C double bond of the eugenol ligand and two Cl atoms for (I) or one Cl atom and a C atom of the phenyl ring for (II)...
April 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28435532/x-ray-structure-of-the-carboplatin-loaded-apo-ferritin-nanocage
#17
Nicola Pontillo, Giarita Ferraro, John R Helliwell, Angela Amoresano, Antonello Merlino
The second-generation Pt anticancer agent carboplatin (CBDCA) was encapsulated within the apo horse spleen ferritin (AFt) nanocage, and the X-ray structure of the drug-loaded protein was refined at 1.49 Å resolution. Two Pt binding sites, different from the one observed in the cisplatin-encapsulated AFt, were identified in Ft subunits by inspection of anomalous electron density maps at two wavelengths and difference Fourier electron density maps, which provide the necessary sensitivity to discriminate between Pt from CBDCA and Cd ions that are present in the crystallization conditions...
April 13, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28435481/a-patient-centered-emergency-department-management-strategy-for-sickle-cell-disease-super-utilizers
#18
Grant G Simpson, Hallie R Hahn, Alex A Powel, Robert R Leverence, Linda A Morris, Lara G Thompson, Marc S Zumberg, Deepa J Borde, Joseph A Tyndall, Jonathan J Shuster, Donald M Yealy, Brandon R Allen
INTRODUCTION: A subpopulation of sickle-cell disease patients, termed super-utilizers, presents frequently to emergency departments (EDs) for vaso-occlusive events and may consume disproportionate resources without broader health benefit. To address the healthcare needs of this vulnerable patient population, we piloted a multidisciplinary intervention seeking to create and use individualized patient care plans that alter utilization through coordinated care. Our goals were to assess feasibility primarily, and to assess resource use secondarily...
April 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28433824/enfsi-collaborative-testing-programme-for-fingermarks-past-experiences-and-future-perspectives
#19
REVIEW
A Matte, J Fish, M Hilgert, T Lövby, M Svensson, J Vaughan, F Zampa
As early as 2004 the Fingerprint Working Group of the European Network of Forensic Science Institutes (ENFSI) has organised proficiency tests (PT's) as well as collaborative exercises (CE's) as a way of raising standards within the fingerprint profession. Participation in PT's and CE's is a key element in the ISO/IEC accreditation process as they enable laboratories to monitor the quality of their analytical results. On the basis of the European Council Framework Decision 2009/905/JHA, of 30 November 2009, on Accreditation of forensic service providers carrying out laboratory activities[1], from November 15th of 2015, only accredited laboratories are allowed to exchange fingerprint data with other EU countries...
March 27, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28433147/mucopolysaccharide-from-cuttlefish-purification-chemical-characterization-and-bioactive-potential
#20
Palaniappan Seedevi, Meivelu Moovendhan, Shanmugam Vairamani, Annaian Shanmugam
The sulfated mucopolysaccharide (GAG) was isolated from S. pharonis and the carbohydrate and protein content was found to be 62.4% and 3.9%. The disaccharide profile of sulfated GAG composed glucuronic acid, N-acetyl glucosamine and sulfate content by contributing 50.11%, 38.00% and 27.69% respectively. The carbon, hydrogen and nitrogen content of the sulfated GAG showed 14.80%, 1.68% and 2.99% respectively. The molecular weight of sulfated GAG was calculated as 27kDa and the structural characterization was done by Fourier Transform Infrared (FT-IR) and NMR Spectroscopy...
July 1, 2017: Carbohydrate Polymers
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