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Bi polar

Gumaa A El-Nagar, Ahmad M Mohammad, Mohamed S El-Deab, Bahgat E El-Anadouli
This study introduces a novel competent dendritic copper oxide-platinum nanocatalyst (nano-Cu2O-Pt) immobilized onto a glassy carbon (GC) substrate for formic acid (FA) electrooxidation (FAO); the prime reaction in the anodic compartment of direct formic acid fuel cells (DFAFCs). Interestingly, the proposed catalyst exhibited an outstanding improvement for FAO compared to the traditional platinum nanoparticles (nano-Pt) modified GC (nano-Pt/GC) catalyst. This was evaluated from steering the reaction mechanism towards the desired direct route producing carbon dioxide (CO2); consistently with mitigating the other undesired indirect pathway producing carbon monoxide (CO); the potential poison deteriorating the catalytic activity of typical Pt-based catalysts...
May 22, 2017: ACS Applied Materials & Interfaces
Jinlian Bi, Jianping Ao, Qing Gao, Zhaojing Zhang, Guozhong Sun, Qing He, Zhiqiang Zhou, Yun Sun, Yi Zhang
Electrodepositon of Ga film is very challenging due to the high standard reduction potential (-0.53 V vs. SHE for Ga3+). In this study, Ga film with compact structure was successfully deposited on Mo/Cu/In substrate by PCE method using GaCl3 aqueous solution. High deposition rate of Ga3+ and H+ can be achieved by applying large overpotential induced by high pulse current. In the meanwhile, the concentration polarization induced by cations depletion can be minimized by changing the pulse frequency and duty-cycle...
May 22, 2017: ACS Applied Materials & Interfaces
Parviz Moradi, Brian Ford-Lloyd, Jeremy Pritchard
This article contains data related to the main research entitled "Metabolomic approach reveals the biochemical mechanisms underlying drought stress tolerance in Thyme" (Moradi et al., 2017) [1]. Two thyme populations with contrasting drought tolerance were subjected to long term water deficit. Leaf samples harvested at the end of stress period and bi-phasic extraction carried out to get polar and non-polar fractions. Extracted samples were analyzed through Direct Infusion FT-ICR mass spectrometry. Date files comprise of four separate tables for all the putatively identified metabolites and their intensities in watered and droughted plants...
June 2017: Data in Brief
Min Ma, Fengli Qu, Xuqiang Ji, Danni Liu, Shuai Hao, Gu Du, Abdullah M Asiri, Yadong Yao, Liang Chen, Xuping Sun
There is an urgent demand to develop earth-abundant electrocatalysts for efficient and durable water oxidation under mild conditions. A nickel-substituted cobalt-borate nanowire array is developed on carbon cloth (Ni-Co-Bi/CC) via oxidative polarization of NiCo2 S4 nanoarray in potassium borate (K-Bi). As a bimetallic electrocatalyst for water oxidation, such Ni-Co-Bi/CC is superior in catalytic activity and durability in 0.1 m K-Bi (pH: 9.2), with a turnover frequency of 0.33 mol O2 s(-1) at the overpotential of 500 mV and nearly 100% Faradaic efficiency...
May 16, 2017: Small
Osamu Sato, Satoshi Komatsu, Tsuyoshi Sakai, Yoshikazu Tsukasaki, Ryosuke Tanaka, Takeomi Mizutani, Tomonobu M Watanabe, Reiko Ikebe, Mitsuo Ikebe
Human myosin VIIa (MYO7A) is an actin-linked motor protein associated with human Usher syndrome (USH) type 1B, which causes human congenital hearing and visual loss. While it has been thought that the role of human myosin VIIa is critical for USH1 protein tethering with actin and transportation along actin bundles in inner-ear hair cells, myosin VIIa's motor function remains unclear. Here, we studied the motor function of the tail-truncated human myosin VIIa dimer (HM7AΔTail/LZ) at the single-molecule level...
May 15, 2017: Journal of Biological Chemistry
Liang Bian, Yu-Jin Li, Jing Li, Jia-Nan Nie, Fa-Qin Dong, Mian-Xin Song, Li-Sheng Wang, Hai-Liang Dong, Hai-Long Li, Xiao-Qin Nie, Xiao-Yan Zhang, Xin-Xi Li, Lei Xie
High-photostability fluorescent (XZn)Fe2O4 (X=Mg, Mn or Ni) embedded in BiFeO3 spinel-perovskite nanocomposites were successfully fabricated via a novel bio-induced phase transfer method using shewanella oneidensis MR-1. These nanocomposites have the near-infrared fluorescence response (XZn or Fe)-O-O-(Bi) interfaces (785/832nm), and the (XZn)Fe2O4/BiFeO3 lattices with high/low potentials (572.15-808.77meV/206.43-548.1meV). Our results suggest that heavy metal ion (Cr(3+), Cd(2+), Co(2+) and Pb(2+)) d↓ orbitals hybridize with the paired-spin X-Zn-Fe d↓-d↓-d↑↓ orbitals to decrease the average polarization angles (-29...
May 1, 2017: Journal of Hazardous Materials
Maria Makrinich, Rupal Gupta, Tatyana Polenova, Amir Goldbourt
The ability of various pulse types, which are commonly applied for distance measurements, to saturate or invert quadrupolar spin polarization has been compared by observing their effect on magnetization recovery curves under magic-angle spinning. A selective central transition inversion pulse yields a bi-exponential recovery for a diamagnetic sample with a spin-3/2, consistent with the existence of two processes: the fluctuations of the electric field gradients with identical single (W1) and double (W2) quantum quadrupolar-driven relaxation rates, and spin exchange between the central transition of one spin and satellite transitions of a dipolar-coupled similar spin...
April 21, 2017: Solid State Nuclear Magnetic Resonance
Eva Pump, Jasmine Viger-Gravel, Edy Abou-Hamad, Manoja K Samantaray, Bilel Hamzaoui, Andrei Gurinov, Dalaver H Anjum, David Gajan, Anne Lesage, Anissa Bendjeriou-Sedjerari, Lyndon Emsley, Jean-Marie Basset
Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) is an emerging technique that allows access to high-sensitivity NMR spectra from surfaces. However, DNP SENS usually requires the use of radicals as an exogenous source of polarization, which has so far limited applications for organometallic surface species to those that do not react with the radicals. Here we show that reactive surface species can be studied if they are immobilized inside porous materials with suitably small windows, and if bulky nitroxide bi-radicals (here TEKPol) are used as the polarization source and which cannot enter the pores...
January 1, 2017: Chemical Science
Xinxin Gong, Mehdi Kargarian, Alex Stern, Di Yue, Hexin Zhou, Xiaofeng Jin, Victor M Galitski, Victor M Yakovenko, Jing Xia
Superconductivity that spontaneously breaks time-reversal symmetry (TRS) has been found, so far, only in a handful of three-dimensional (3D) crystals with bulk inversion symmetry. We report an observation of spontaneous TRS breaking in a 2D superconducting system without inversion symmetry: the epitaxial bilayer films of bismuth and nickel. The evidence comes from the onset of the polar Kerr effect at the superconducting transition in the absence of an external magnetic field, detected by the ultrasensitive loop-less fiber-optic Sagnac interferometer...
March 2017: Science Advances
Wanzhuo Ma, Tianshu Wang, Yan Zhang, Peng Liu, Yuwei Su, Qingsong Jia, Mingzhe Bi, Peng Zhang, Huilin Jiang
We propose and experimentally demonstrate a widely tunable mode-locked thulium-doped fiber laser. The laser can operate at both continuous-wave and mode-locked states at different pump power levels. A classic nonlinear polarization rotation structure is employed to obtain the passive mode-locked laser. A birefringence Lyot filter as a fiber comb filter is used to expand the tuning range. Thanks to the filtering component, the tuning range of the continuous-wave laser can reach 127 nm (1823-1950 nm). The tuning ranges of the single-wavelength and dual-wavelength mode-locked lasers are 94 nm (1835-1929 nm) and 87 nm (1831-1918 nm), respectively, with a 3...
April 20, 2017: Applied Optics
Chris T McAllister, R Scott Seville, Charles R Bursey
During May and July 2016, 32 eastern small-footed myotis (Myotis leibii) were collected from five counties of northwestern Arkansas and their faeces examined for coccidian parasites. Four of 32 (13%) M. leibii harboured an eimerian that we describe here as new. Oocysts of Eimeria sassei sp. n. were ovoidal to ellipsoidal with a bi-layered wall and measured (length × width, L × W) 18.3 × 15.2 µm, with an L/W ratio of 1.2. A micropyle and oocyst residuum were absent but 1-2 polar granules were present. Sporocysts were ovoidal, 9...
June 1, 2017: Acta Parasitologica
Marcos Tobias de Santana Miglionico, Lúcio André Viana
A new coccidian species of the genus Caryospora Léger, 1904 (Apicomplexa, Eimeriidae) is described based on material from the Guanabara spotted night snake Siphlophis pulcher (Raddi) (Reptilia: Dipsadidae) in a coastal area of the Atlantic Forest in Ilha Grande Island, state of Rio de Janeiro, southeastern Brazil. Caryospora ceadsensis n. sp. possesses spheroidal to slightly subspheroidal oöcysts measuring 17-24 × 17-24 (22.1 × 22.0) µm, with a c.1.3 µm thick bi-layered wall (inner layer smooth, outer layer slightly striated), length/width (L/W) ratio of 1...
April 19, 2017: Systematic Parasitology
Joao Vidal, Andrey V Turutin, Ilya V Kubasov, Mikhail D Malinkovich, Yurii N Parkhomenko, Svetlana P Kobeleva, Andrei L Kholkin, Nikolai A Sobolev
The anisotropic direct magnetoelectric (ME) properties of bi-layered composites comprising magnetostrictive metglas foils and single-crystalline piezoelectric bidomain plates of 127ºY-cut LiNbO<sub>3<sub> (LNO) have been studied theoretically and experimentally. The LNO plates possessed an engineered ferroelectric macrobidomain structure with opposite spontaneous polarization vectors. Impedance, ME effect and equivalent magnetic noise density measurements have been performed under quasi-static and resonant conditions...
April 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Rui Wang, Wei Guan, Zheng-Bo Han, Fushun Liang, Takeo Suga, Xihe Bi, Hiroyuki Nishide
An ambient-light-promoted and metal-free three-component reaction of active methylene compounds, perfluoroalkyl iodides, and guanidines/amidines is reported. This constitutes a powerful method to prepare perfluoroalkylated pyrimidines with mild reaction conditions, broad substrate scope, excellent functional group tolerance, and simple operation. A radical/polar mechanism involving the formation of a halogen-bond adduct and radical cross-coupling is proposed.
May 5, 2017: Organic Letters
Masahito Murai, Erika Uemura, Shunsuke Hori, Kazuhiko Takai
A regioselective cyclization of 1,n-diynes under rhenium catalysis was developed on the basis of a rare type of 1,1-difunctionalization of terminal alkynes with carbon nucleophiles, followed by sequential addition reactions of the resulting alkenylrhenium species. The reaction provides an efficient approach to the synthesis of complex cyclopentane-fused bi- and tricycles and spirocycles, which are useful building blocks for the construction of essential frameworks of biologically active compounds as well as functional materials, from simple starting materials by the formation of up to six new carbon-carbon bonds in a single step...
April 11, 2017: Angewandte Chemie
I I Klimovskikh, D Sostina, A Petukhov, A G Rybkin, S V Eremeev, E V Chulkov, O E Tereshchenko, K A Kokh, A M Shikin
Two- and three-dimensional topological insulators are the key materials for the future nanoelectronic and spintronic devices and quantum computers. By means of angle- and spin-resolved photoemission spectroscopy we study the electronic and spin structure of the Bi-bilayer/3D topological insulator in quantum tunneling regime formed under the short annealing of Bi2Te2.4Se0.6. Owing to the temperature-induced restructuring of the topological insulator's surface quintuple layers, the hole-like spin-split Bi-bilayer bands and the parabolic electronic-like state are observed instead of the Dirac cone...
April 5, 2017: Scientific Reports
Gavriel Lerner, Tzvi Diskin, Ofer Neufeld, Ofer Kfir, Oren Cohen
Phase matching in high-harmonic generation leads to enhancement of multiple harmonics. It is sometimes desired to control the spectral structure within the phase-matched spectral region. We propose a scheme for selective suppression of high-order harmonics within the phase-matched spectral region while weakly influencing the other harmonics. The method is based on addition of phase-mismatched segments within a phase-matched medium. We demonstrate the method numerically in two examples. First, we show that one phase-mismatched segment can significantly suppress harmonic orders 9, 15, and 21...
April 1, 2017: Optics Letters
Gordon Schlolaut, Achim Brauer, Takeshi Nakagawa, Henry F Lamb, Jonathan J Tyler, Richard A Staff, Michael H Marshall, Christopher Bronk Ramsey, Charlotte L Bryant, Pavel E Tarasov
The Younger Dryas Stadial (YDS) was an episode of northern hemispheric cooling which occurred within the Last Glacial Interglacial Transition (LGIT). A major driver for the YDS climate was a weakening of the Atlantic Meridional Overturning Circulation (AMOC). It has been inferred that the AMOC began to strengthen mid-YDS, producing a bipartite structure of the YDS in records from continental Europe. These records imply that the polar front and westerlies shifted northward, producing a warmer second phase of the YDS in Europe...
March 31, 2017: Scientific Reports
Jeong-Hwan Han, Takuji Oda
Steels are easily corroded in a liquid lead-bismuth eutectic (LBE) because their components, such as Fe, Cr and Ni, exhibit a high solubility in the liquid LBE. To understand the reason for such a high solubility of these 3d transition metals, we have performed first-principles molecular dynamics calculations and analyzed the pair-correlation functions, electronic densities of states, and Bader charges and volumes of the 3d transition metals dissolved in the liquid LBE as impurities. The calculations show that the 4s and 3d orbitals of the 3d impurity atoms largely interact with the 6p band of the LBE, which generates bonding orbitals...
April 12, 2017: Physical Chemistry Chemical Physics: PCCP
Giovanni V Resta, Tarun Agarwal, Dennis Lin, Iuliana P Radu, Francky Catthoor, Pierre-Emmanuel Gaillardon, Giovanni De Micheli
Two-dimensional semiconducting materials of the transition-metal-dichalcogenide family, such as MoS2 and WSe2, have been intensively investigated in the past few years, and are considered as viable candidates for next-generation electronic devices. In this paper, for the first time, we study scaling trends and evaluate the performances of polarity-controllable devices realized with undoped mono- and bi-layer 2D materials. Using ballistic self-consistent quantum simulations, it is shown that, with the suitable channel material, such polarity-controllable technology can scale down to 5 nm gate lengths, while showing performances comparable to the ones of unipolar, physically-doped 2D electronic devices...
March 30, 2017: Scientific Reports
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