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electronic proximity

Yao Zhang, Qiu-Shi Meng, Li Zhang, Yang Luo, Yun-Jie Yu, Ben Yang, Yang Zhang, Ruben Esteban, Javier Aizpurua, Yi Luo, Jin-Long Yang, Zhen-Chao Dong, J G Hou
The coherent interaction between quantum emitters and photonic modes in cavities underlies many of the current strategies aiming at generating and controlling photonic quantum states. A plasmonic nanocavity provides a powerful solution for reducing the effective mode volumes down to nanometre scale, but spatial control at the atomic scale of the coupling with a single molecular emitter is challenging. Here we demonstrate sub-nanometre spatial control over the coherent coupling between a single molecule and a plasmonic nanocavity in close proximity by monitoring the evolution of Fano lineshapes and photonic Lamb shifts in tunnelling electron-induced luminescence spectra...
May 19, 2017: Nature Communications
Ori Hazut, Roie Yerushalmi
The development of new doping methods extending beyond the traditional and well-established techniques is desired to match the rapid advances made in semiconductor processing methods and nanostructure synthesis in numerous emerging applications, including the doping of 3D architectures. To address this, monolayer doping (MLD) and monolayer contact doping (MLCD) methods were recently introduced. The monolayer doping methods enable separation of the doping process of nanostructures from the synthesis step, hence it is also termed ex-situ doping...
May 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
E Pehlivan, N Özbay, A S Yargıç, R Z Şahin
Pyrolysis is an eco-friendly process to achieve valuable products like bio-oil, char and gases. In the last decades, biochar production from pyrolysis of a wide variety of industrial and agricultural wastes become popular, which can be utilized as adsorbent instead of the expensive activated carbons. In this study, cherry pulp was pyrolyzed in a fixed bed tubular reactor at five different temperatures (400, 500,550, 600 and 700 °C) and three different heating rates (10, 100 and 200 °C/min) to obtain biochar...
May 7, 2017: Journal of Environmental Management
Yizhou Zhao, Kathryn Moran, Mammo Yewondwossen, James Allan, Scott Clarke, Murali Rajaraman, Derek Wilke, Paul Joseph, James L Robar
Three-dimensional (3D) printing is suitable for the fabrication of complex radiotherapy bolus. Although investigated from dosimetric and feasibility standpoints, there are few reports to date of its use for actual patient treatment. This study illustrates the versatile applications of 3D printing in clinical radiation oncology through a selection of patient cases, namely, to create bolus for photon and modulated electron radiotherapy (MERT), as well as applicators for surface high-dose rate (HDR) brachytherapy...
May 8, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
Xuewu Sui, Andrew C Weitz, Erik R Farquhar, Mohsen Badiee, Surajit Banerjee, Johannes von Lintig, Gregory Tochtrop, Krzysztof Palczewski, Michael P Hendrich, Philip D Kiser
Carotenoid cleavage oxygenases (CCOs) are non-heme iron enzymes that catalyze scission of alkene groups in carotenoids and stilbenoids to form biologically important products. CCOs possess a rare 4-His iron center whose resting-state structure and interaction with substrates are incompletely understood. Here, we address this knowledge gap through a comprehensive structural and spectroscopic study of three phyletically diverse CCOs. The crystal structure of a fungal stilbenoid-cleaving CCO, CAO1, reveals strong similarity between its iron center and those of carotenoid-cleaving CCOs, but with a markedly different substrate-binding cleft...
May 11, 2017: Biochemistry
Liang Zhang, Ben-Chuan Lin, Yan-Fei Wu, Han-Chun Wu, Tsung-Wei Huang, Ching-Ray Chang, Xiaoxing Ke, Mert Kurttepeli, Gustaaf Van Tendeloo, Jun Xu, Dapeng Yu, Zhi-Min Liao
It has been theoretically proposed that the spin textures of surface states in a topological insulator can be directly transferred to graphene by means of the proximity effect, which is very important for realizing a two-dimensional topological insulator based on graphene. Here we report the anomalous magnetotransport properties of graphene-topological insulator Bi2Se3 heterojunctions, which are sensitive to the electronic coupling between graphene and the topological surface state. The coupling between the pz orbitals of graphene and the p orbitals of the surface states on the Bi2Se3 bottom surface can be enhanced by applying a perpendicular negative magnetic field, resulting in a giant negative magnetoresistance at the Dirac point up to about -91%...
May 16, 2017: ACS Nano
Elena Vishnyakova, Gaowei Chen, Bruce E Brinson, Lawrence B Alemany, W Edward Billups
As a result of the unique physical and electrical properties, graphene continues to attract the interest of a large segment of the scientific community. Since graphene does not occur naturally, the ability to exfoliate and isolate individual layers of graphene from graphite is an important and challenging process. The interlayer cohesive energy of graphite that results from van der Waals attractions has been determined experimentally to be 61 meV per carbon atom (61 meV/C atom). This requires the development of a method to overcome the strong attractive forces associated with graphite...
May 9, 2017: Accounts of Chemical Research
Michael Buege, Till Koehler, Ralf Heiderhoff, Marc Papenheim, Si Wang, Heinrich Schleiting, Wolfgang H Arnold, Jason R Foerst, Melchior Seyfarth, Klaus Tiroch, Thomas Riedl, Marc Vorpahl
BACKGROUND: Medical devices such as implant delivery systems are commonly used during minimally invasive procedures in the cardiovascular system. These devices often have lubricious polymer coatings to reduce friction between the device and blood vessels but coatings may separate and potentially cause serious injuries to patients. METHODS: Lubricious coated eSheaths for transcatheter heart valve implantation were assessed for luminal integrity at the proximal, medial and distal part...
2017: PloS One
Hamouda Samia, Boussetta Khadija, Hamzaoui Agnes, Khalsi Fatma, Trabelsi Ines, Jaafoura Hafedh, Tinsa Faten
BACKGROUND: Primary ciliary dyskinesia (PCD) is rare. Its diagnosis requires experienced specialists and expensive infrastructure. Its prognosis is variable. OBJECTIVE: To study the long-term outcome of PCD in Tunisian children with ciliary ultra-structure defects detected by electron microscope. METHODS: Covering a period of 20 years (1996-2015), this retrospective study included all patients with definite PCD (outer dynein arms (DA) defects and/or situs inversus) and presumed PCD (other ciliary ultra-structure defects)...
December 2016: African Health Sciences
Alexandros Mallios, John Blebea, Bryan Buster, Ryan Messiner, Kevin Taubman, Harry Ma
OBJECTIVE: To investigate the clinical results of laser atherectomy in the treatment of peripheral arterial disease. METHODS: Retrospective analysis of consecutive patients undergoing laser atherectomy at a single institution during a seven year period by vascular surgeons and interventional cardiologists in a tertiary university-affiliated hospital. Clinical data was retrieved from patient charts and hospital electronic medical records along with the associated arteriograms...
May 4, 2017: Annals of Vascular Surgery
D Wolff, S Schick, H J Staehle, C Frese
INTRODUCTION: Limited access to interdental spaces complicates removal of excess material when placing class II composite resin restorations. Evidence-based recommendations on interproximal finishing are rare. We present novel microscalpels for this indication. The aim of the study was to test their fracture strength and cutting ability and to compare microscalpels with the use of a scaler, oscillating devices (G5-ProShape, G5-Proxocare), finishing strips and scalpels of sizes 12, 15, and 21 in a standardized in vitro model...
May 2017: Operative Dentistry
C Shahidi, I Krejci, D Dietschi
The present study evaluated the influence of various low-shrinkage restorative systems in class II direct composite restorations following simulated occlusal loading. Forty MOD class II cavities were prepared on freshly extracted human lower third molars with proximal margins located mesially 1.0 mm coronal to and distally 1 mm apical to the cementoenamel junction. The samples were randomly distributed into five experimental groups corresponding to the following restorative systems: a conventional resin composite (Tetric) as active control group, a low-shrinkage composite (Extra Low Shrinkage [ELS]) alone or combined with its corresponding flowable version (ELSflow) used as a 1- to 1...
May 2017: Operative Dentistry
Fenglei Gao, Taotao Fan, Jing Wu, Sha Liu, Yan Du, Yao Yao, Fuyi Zhou, Yu Zhang, Xianjiu Liao, Deqin Geng
We describe a novel label-free and signal-on electrochemical DNA sensing platform via proximity hybridization triggered hemin/G-quadruplex formation based on the direct electron transfer of hemin. The thiolated modified G-DNA1 was first immobilized onto the Au electrode surface. In the presence of target DNA, Y-junction-structure ternary complex can be formed to trigger the proximity assembly of G-DNA1, hemin, and G-DNA2, which leads to the formation of hemin/G-quadruplex for generation an amplified electrochemical signal by differential pulse voltammetry...
April 19, 2017: Biosensors & Bioelectronics
Sandeep Dhanju, Brendan W Blazejewski, David Crich
The influence of the electron-withdrawing azide group on the reduction of O-(1-acyloxy-ω-azido)hydroxylamines by triethylsilane in the presence of boron trifluoride etherate is studied and found to increase with increasing proximity to the reaction site, suggesting that the reaction proceeds by way of aminoxocarbenium ion intermediates. The ability to carry azides through the reaction sequence affords O-(ω-azidoalkyl-N,N-dialkylhydroxylamines thereby making such functionality available for use in click chemistry...
May 8, 2017: Journal of Organic Chemistry
Tomasz Mazur, Bartosz A Grzybowski
Quantum mechanical calculations at various levels of theory indicate that charges (both "+" and "-") on organic polymers can be stabilized by radicals on nearby polymer chains. The stabilization mechanism is based on the formation of intermolecular odd-electron, two-center bonds with possible concomitant spin density redistribution (depending on the polymer and the number and type of proximal heteroatoms). This result is in line with our previous experimental demonstrations that on various types of polymers charged by contact electrification, radicals co-localize and help stabilize proximal charges (of either polarity)...
March 1, 2017: Chemical Science
Meena Kathiresan, Ann M English
We recently reported that cytochrome c peroxidase (Ccp1) functions as a H2O2 sensor protein when H2O2 levels rise in respiring yeast. The availability of its reducing substrate, ferrocytochrome c (Cyc(II)), determines whether Ccp1 acts as a H2O2 sensor or peroxidase. For H2O2 to serve as a signal it must modify its receptor so we employed high-performance LC-MS/MS to investigate in detail the oxidation of Ccp1 by 1, 5 and 10 M eq. of H2O2 in the absence of Cyc(II) to prevent peroxidase activity. We observe strictly heme-mediated oxidation, implicating sequential cycles of binding and reduction of H2O2 at Ccp1's heme...
February 1, 2017: Chemical Science
Karen Salazar, Stéphane Boucher, José Eduardo Serrão
The morphoanatomy of the ovary in Veturius sinuatus (Eschscholtz) was studied by light and transmission electron microscopy. Data from the female gonad of this species provides more extended and precise knowledge regarding the organization of the ovary in Passalidae. Ovaries are composed of a pair of long telotrophic meroistic ovarioles, with some differences compared to the bauplan of this ovary type in Polyphaga (Coleoptera). The terminal filament has an enlarged proximal region with irregularly shaped cells in apparent degeneration process embedded in a membranous system...
April 24, 2017: Arthropod Structure & Development
Jade Benjamin-Chung, Jaynal Abedin, David Berger, Ashley Clark, Veronica Jimenez, Eugene Konagaya, Diana Tran, Benjamin F Arnold, Alan E Hubbard, Stephen P Luby, Edward Miguel, John M Colford
Background: Many interventions delivered to improve health may benefit not only direct recipients but also people in close physical or social proximity. Our objective was to review all published literature about the spillover effects of interventions on health outcomes in low-middle income countries and to identify methods used in estimating these effects. Methods: We searched 19 electronic databases for articles published before 2014 and hand-searched titles from 2010 to 2013 in five relevant journals...
April 24, 2017: International Journal of Epidemiology
Cheng Gong, Lin Li, Zhenglu Li, Huiwen Ji, Alex Stern, Yang Xia, Ting Cao, Wei Bao, Chenzhe Wang, Yuan Wang, Z Q Qiu, R J Cava, Steven G Louie, Jing Xia, Xiang Zhang
The realization of long-range ferromagnetic order in two-dimensional van der Waals crystals, combined with their rich electronic and optical properties, could lead to new magnetic, magnetoelectric and magneto-optic applications. In two-dimensional systems, the long-range magnetic order is strongly suppressed by thermal fluctuations, according to the Mermin-Wagner theorem; however, these thermal fluctuations can be counteracted by magnetic anisotropy. Previous efforts, based on defect and composition engineering, or the proximity effect, introduced magnetic responses only locally or extrinsically...
April 26, 2017: Nature
Alain C Tagne Kuate, Roger A Lalancette, F Jäkle
The synthesis of ferrocenylphosphine-borane adducts 1,2-fc(E)(PPh2·BH3) (E = SnR2R', HgX; 1,2-fc = 1,2-ferrocenediyl) that are substituted with organotin or organomercury Lewis acid moieties in ortho-position is presented. Several compounds that feature two ferrocenylphosphine-borane moieties bridged by Sn or Hg are also introduced. The products are fully characterized by multinuclear NMR spectroscopy, high-resolution MALDI-TOF mass spectrometry and elemental analysis. The attachment of the Lewis acid substituent to the same Cp ring of the ferrocene results in planar-chirality and the close proximity between the boron hydride group and the Lewis acid is expected to allow for agostic-type B-HE (E = Sn, Hg) interactions...
May 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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