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https://www.readbyqxmd.com/read/29341701/3d-quantum-hall-effect-of-fermi-arcs-in-topological-semimetals
#1
C M Wang, Hai-Peng Sun, Hai-Zhou Lu, X C Xie
The quantum Hall effect is usually observed in 2D systems. We show that the Fermi arcs can give rise to a distinctive 3D quantum Hall effect in topological semimetals. Because of the topological constraint, the Fermi arc at a single surface has an open Fermi surface, which cannot host the quantum Hall effect. Via a "wormhole" tunneling assisted by the Weyl nodes, the Fermi arcs at opposite surfaces can form a complete Fermi loop and support the quantum Hall effect. The edge states of the Fermi arcs show a unique 3D distribution, giving an example of (d-2)-dimensional boundary states...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341689/prediction-of-triple-point-fermions-in-simple-half-heusler-topological-insulators
#2
Hao Yang, Jiabin Yu, Stuart S P Parkin, Claudia Felser, Chao-Xing Liu, Binghai Yan
We predict the existence of triple point fermions in the band structure of several half-Heusler topological insulators by ab initio calculations and the Kane model. We find that many half-Heusler compounds exhibit multiple triple points along four independent C_{3} axes, through which the doubly degenerate conduction bands and the nondegenerate valence band cross each other linearly nearby the Fermi energy. When projected from the bulk to the (111) surface, most of these triple points are located far away from the surface Γ[over ¯] point, as distinct from previously reported triple point fermion candidates...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341414/post-translational-incorporation-of-3-4-dihydroxyphenylalanine-into-the-c-terminus-of-%C3%AE-tubulin-in-living-cells
#3
Yanela M Dentesano, Yanina Ditamo, Cristian Hansen, Carlos A Arce, C Gastón Bisig
The C-terminal tyrosine (Tyr) of the α-tubulin chain is subjected to post-translational removal and re-addition in a process termed the "detyrosination/tyrosination cycle". We showed in previous studies using soluble rat brain extracts that L-3,4-dihydroxyphenylalanine (L-Dopa) is incorporated into the same site as Tyr. We now demonstrate that L-Dopa incorporation into tubulin also occurs in living cells. We detected such incorporation by determining the "tyrosination state" of tubulin before and after incubation of cells in the presence of L-Dopa...
January 17, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29339996/judging-in-rhythmic-gymnastics-at-different-levels-of-performance
#4
Catarina Leandro, Lurdes Ávila-Carvalho, Elena Sierra-Palmeiro, Marta Bobo-Arce
This study aimed to analyse the quality of difficulty judging in rhythmic gymnastics, at different levels of performance. The sample consisted of 1152 difficulty scores concerning 288 individual routines, performed in the World Championships in 2013. The data were analysed using the mean absolute judge deviation from the final difficulty score, a Cronbach's alpha coefficient and intra-class correlations, for consistency and reliability assessment. For validity assessment, mean deviations of judges' difficulty scores, the Kendall's coefficient of concordance W and ANOVA eta-squared values were calculated...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29338641/an-assessment-of-the-level-of-awareness-and-reported-complaints-regarding-occupational-health-hazards-and-the-utilization-of-personal-protective-equipments-among-the-welders-of-lahore-pakistan
#5
Syed Moin Hassan, Usama Nasir, Kanwal Anwar, Usama Talib
Objective To assess the level of awareness and reported complaints of occupational health hazards among the welders of Lahore. Methods A cross-sectional descriptive study of 70 welders. An interview questionnaire was employed to assess awareness and complaints, the possession and utilization of protective personal equipment (PPE), and socio-demographic characteristics. Results All of the respondents were male with a mean age of 25.7 years. 54.3% of the respondents were aware of welding as a risk to their health...
January 17, 2018: International Journal of Occupational and Environmental Health
https://www.readbyqxmd.com/read/29336348/optimizing-highly-noncoplanar-vmat-trajectories-the-novo-method
#6
Marco Langhans, Jan Unkelbach, Thomas Bortfeld, David Craft
We introduce a new method called NoVo (Noncoplanar VMAT Optimization) to produce volumetric modulated arc therapy (VMAT) treatment plans with noncoplanar trajectories. While the use of noncoplanar beam arrangements for intensity modulated radiation therapy (IMRT), and in particular high fraction stereotactic radiosurgery (SRS), is common, noncoplanar beam trajectories for VMAT are less common as the availability of treatment machines handling these is limited. For both IMRT and VMAT, the beam angle selection problem is highly nonconvex in nature, which is why automated beam angle selection procedures have not entered mainstream clinical usage...
January 16, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29334784/unilateral-lag-screw-fixation-of-isolated-non-union-atlas-lateral-mass-fracture-a-new-technical-note
#7
Majid Reza Farrokhi, Arash Kiani, Hamid Rezaei
We describe a novel and new technique of posterior unilateral lag screw fixation of non-union atlas lateral mass fracture. A 46-year-old man presented with cervical pain and tenderness after a vehicle turn over accident and he was diagnosed to have left atlas lateral mass fracture. He was initially treated by immobilization using Minerva orthosis. About 2 months later, he developed severe neck pain and limitation of motion and thus he was scheduled for operation due to non-union atlas lateral mass fracture...
January 15, 2018: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/29334027/patient-specific-quality-assurance-using-monte-carlo-dose-calculation-and-elekta-log-files-for-prostate-volumetric-modulated-arc-therapy
#8
Yoshiyuki Katsuta, Noriyuki Kadoya, Yukio Fujita, Eiji Shimizu, Kenichi Matsunaga, Kinya Sawada, Haruo Matsushita, Kazuhiro Majima, Keiichi Jingu
Log file-based methods are attracting increasing interest owing to their ability to validate volumetric-modulated arc therapy outputs with high resolution in the leaf and gantry positions and in delivered dose. Cross-validation of these methods for comparison with measurement-based methods using the ionization chamber/ArcCHECK-3DVH software (version 3.2.0) under the same conditions of treatment anatomy and plan enables an efficient evaluation of this method. In this study, with the purpose of cross-validation, we evaluate the accuracy of a log file-based method using Elekta log files and an X-ray voxel Monte Carlo dose calculation technique in the case of leaf misalignment during prostate volumetric-modulated arc therapy...
December 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29332664/rounded-data-have-a-high-potential-for-false-comparative-statistical-results-as-shown-with-elbow-arc-of-motion
#9
Vilijam Zdravkovic, Bernhard Jost
BACKGROUND AND HYPOTHESIS: Visually measured range-of-motion (ROM) data are usually rounded to the nearest 5° interval and then recorded. Rounding might significantly influence the outcome of statistical tests. METHODS: We performed numerical simulation of t test application on 2 datasets, as typically reported for the elbow flexion-extension arc of motion. The test was performed on exact data and then repeated on the same data rounded to the nearest 5° interval...
February 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29332663/results-after-radial-head-arthroplasty-in-unstable-fractures
#10
Ariana Lott, Kari Broder, Abraham Goch, Sanjit R Konda, Kenneth A Egol
BACKGROUND: Whereas most radial head fractures are stable injuries, they sometimes occur as part of complex injury patterns with associated elbow instability. Radial head arthroplasty has been favored in patients with unreconstructable radial head fractures and unstable elbow injuries. The purpose of this study was to review radiographic outcomes, functional outcomes, and complications after radial head arthroplasty for radial head fracture in unstable elbow injuries. METHODS: This study was a retrospective review of radial head fractures treated with radial head arthroplasty by a single surgeon during a 15-year period...
February 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29332395/structure-and-reactivity-of-half-sandwich-rh-3-and-ir-3-carbene-complexes-catalytic-metathesis-of-azobenzene-derivatives
#11
Daniel J Tindall, Christophe Werlé, Richard Goddard, Petra Philipps, Christophe Farès, Alois Fürstner
Traditional rhodium carbene chemistry relies on the controlled decomposition of diazo derivatives with [Rh2(OAc)4] or related dinuclear Rh(+2) complexes, whereas the use of other rhodium sources is much less developed. It is now shown that half-sandwich carbene species derived from [Cp*MX2]2 (M = Rh, Ir; X = Cl, Br, I, Cp* = pentamethylcyclopentadienyl) also exhibit favorable application profiles. Interestingly, the anionic ligand X proved to be a critical determinant of reactivity in the case of cyclopropanation, epoxide formation and the previously unknown catalytic metathesis of azobenzene derivatives, whereas the nature of X does not play any significant role in -OH insertion reactions...
January 14, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29329321/impact-of-lipopolysaccharide-induced-acute-inflammation-on-baroreflex-controlled-sympathetic-arterial-pressure-regulation
#12
Takeshi Tohyama, Keita Saku, Toru Kawada, Takuya Kishi, Keimei Yoshida, Takuya Nishikawa, Hiroshi Mannoji, Kazuhiro Kamada, Kenji Sunagawa, Hiroyuki Tsutsui
BACKGROUND: Lipopolysaccharide (LPS) induces acute inflammation, activates sympathetic nerve activity (SNA) and alters hemodynamics. Since the arterial baroreflex is a negative feedback system to stabilize arterial pressure (AP), examining the arterial baroreflex function is a prerequisite to understanding complex hemodynamics under LPS challenge. We investigated the impact of LPS-induced acute inflammation on SNA and AP regulation by performing baroreflex open-loop analysis. METHODS: Ten anesthetized Sprague-Dawley rats were used...
2018: PloS One
https://www.readbyqxmd.com/read/29328922/a-viral-arc-hive-for-metazoan-memory
#13
Nicholas F Parrish, Keizo Tomonaga
Arc, a master regulator of synaptic plasticity, contains sequence elements that are evolutionarily related to retrotransposon Gag genes. Two related papers in this issue of Cell show that Arc retains retroviral-like capsid-forming ability and can transmit mRNA between cells in the nervous system, a process that may be important for synaptic function.
January 11, 2018: Cell
https://www.readbyqxmd.com/read/29328916/the-neuronal-gene-arc-encodes-a-repurposed-retrotransposon-gag-protein-that-mediates-intercellular-rna-transfer
#14
Elissa D Pastuzyn, Cameron E Day, Rachel B Kearns, Madeleine Kyrke-Smith, Andrew V Taibi, John McCormick, Nathan Yoder, David M Belnap, Simon Erlendsson, Dustin R Morado, John A G Briggs, Cédric Feschotte, Jason D Shepherd
The neuronal gene Arc is essential for long-lasting information storage in the mammalian brain, mediates various forms of synaptic plasticity, and has been implicated in neurodevelopmental disorders. However, little is known about Arc's molecular function and evolutionary origins. Here, we show that Arc self-assembles into virus-like capsids that encapsulate RNA. Endogenous Arc protein is released from neurons in extracellular vesicles that mediate the transfer of Arc mRNA into new target cells, where it can undergo activity-dependent translation...
January 11, 2018: Cell
https://www.readbyqxmd.com/read/29328915/retrovirus-like-gag-protein-arc1-binds-rna-and-traffics-across-synaptic-boutons
#15
James Ashley, Benjamin Cordy, Diandra Lucia, Lee G Fradkin, Vivian Budnik, Travis Thomson
Arc/Arg3.1 is required for synaptic plasticity and cognition, and mutations in this gene are linked to autism and schizophrenia. Arc bears a domain resembling retroviral/retrotransposon Gag-like proteins, which multimerize into a capsid that packages viral RNA. The significance of such a domain in a plasticity molecule is uncertain. Here, we report that the Drosophila Arc1 protein forms capsid-like structures that bind darc1 mRNA in neurons and is loaded into extracellular vesicles that are transferred from motorneurons to muscles...
January 11, 2018: Cell
https://www.readbyqxmd.com/read/29328403/arcuate-nucleus-neurons-are-not-essential-for-the-preprandial-peak-in-plasma-ghrelin-after-neonatal-monosodium-glutamate-treatment
#16
Qing-Chun Li, Qing-Feng Li, Yan-Lin Wang, Hong-Liang Sun, Zheng-Yao Jiang
The aim of the present study was to determine whether arcuate nucleus (ARC) lesions affect the ghrelin level in the plasma and the stomach in monosodium glutamate (MSG)‑treated mice. The aim of the present study was to investigate whether the ARC was destroyed in mice treated neonatally with MSG, and whether the ARC lesions affect the ghrelin level in the plasma and lipid mobilization in MSG‑treated mice. The results revealed that MSG led to a marked reduction in ARC cresyl violet staining, tyrosine hydroxylase-immunoreactive (IR) neurons and neuropeptide Y‑IR fibers, compared with saline controls...
January 5, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29328311/status-analysis-of-keyhole-bottom-in-laser-mag-hybrid-welding-process
#17
Lin Wang, Xiangdong Gao, Ziqin Chen
The keyhole status is a determining factor of weld quality in laser-metal active gas arc (MAG) hybrid welding process. For a better evaluation of the hybrid welding process, three different penetration welding experiments: partial penetration, normal penetration (or full penetration), and excessive penetration were conducted in this work. The instantaneous visual phenomena including metallic vapor, spatters and keyhole of bottom surface were used to evaluate the keyhole status by a double high-speed camera system...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328270/ultrasensitive-fiber-tilt-sensor-based-on-a-mobile-inscribed-microbubble-along-the-arc-shaped-inwall-of-the-microcavity-publisher-s-note
#18
Kunjian Cao, Yi Liu, Shiliang Qu
This publisher's note corrects an error in the funding section in Opt. Lett.42, 4418 (2017).OPLEDP0146-959210.1364/OL.42.004418.
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29327542/-treatment-of-coronal-shear-fracture-of-the-distal-end-of-the-humerus-by-the-olecranon-osteotomy-approach
#19
Xiu-Wu Guo, Jian Fan, Feng Yuan
OBJECTIVE: To explore the effectiveness of olecranon osteotomy approach for the treatment of coronal shear fracture of the distal end of the humerus. METHODS: A retrospective analysis was made on the clinical data of 34 patients with the coronal shear fracture of the distal end of the humerus treated by the olecranon osteotomy approach from January 2005 to January 2013. Of 34 cases, there were 15 boys and 19 girls, aged from 17 years to 84 years (mean, 54.9±10...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29327360/aboveground-herbivory-induced-jasmonates-disproportionately-reduce-plant-reproductive-potential-by-facilitating-root-nematode-infestation
#20
Ricardo A R Machado, Carla C M Arce, Michael A McClure, Ian T Baldwin, Matthias Erb
Different plant-feeders, including insects and parasitic nematodes, can influence each other by triggering systemic changes in their shared host plants. In most cases however, the underlying mechanisms are unclear, and the consequences for plant fitness are not well understood. We studied the interaction between leaf feeding Manduca sexta caterpillars and root parasitic nematodes in Nicotiana attenuata. Simulated Manduca sexta attack increased the abundance of root parasitic nematodes in the field and facilitated Meloidogyne incognita reproduction in the glasshouse...
January 12, 2018: Plant, Cell & Environment
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