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Scott T Akin, Vicente Zamudio-Bayer, Kaining Duanmu, Georg Leistner, Konstantin Hirsch, Christine Buelow, Arkadiusz Lawicki, Akira Terasaki, Bernd von Issendorff, Donald G Truhlar, J Tobias Lau, Michael A Duncan
Cobalt-benzene cluster ions of the form Co3(bz)n+ (n = 0-3) were produced in the gas-phase, mass-selected, and cooled in a cryogenic ion trap held at 34 K. To explore ligand effects on cluster magnetic moments, these species were investigated with X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) spectroscopy. XMCD spectra yield both the spin and orbital angular momenta of these clusters. Co3+ has a spin magnetic moment of S = 6 µB and an orbital magnetic moment of L = 3 µB...
October 25, 2016: Journal of Physical Chemistry Letters
Yao Liu, Chu-Jun Zhou, Qingjiang Li, Honggen Wang
The first total synthesis of structurally unique polycyclic phenolic meroterpenoids, ganocins B and C is reported. The synthesis features gold-catalyzed intramolecular cascade cyclization to construct the C/D ring bearing an angular methyl group, diastereoselective Michael addition, and acid-mediated one-pot Robinson cyclization/deprotection/isomerization.
October 25, 2016: Organic & Biomolecular Chemistry
Quinten van Geest, B Westerik, Y D van der Werf, J J G Geurts, H E Hulst
Sleep disturbances are common in multiple sclerosis (MS), but its impact on cognition and functional connectivity (FC) of the hippocampus and thalamus is unknown. Therefore, we investigated the relationship between sleep disturbances, cognitive functioning and resting-state (RS) FC of the hippocampus and thalamus in MS. 71 MS patients and 40 healthy controls underwent neuropsychological testing and filled out self-report questionnaires (anxiety, depression, fatigue, and subjective cognitive problems). Sleep disturbances were assed with the five-item version of the Athens Insomnia Scale...
October 24, 2016: Journal of Neurology
Daipayan Guha, Raphael Jakubovic, Shaurya Gupta, Naif M Alotaibi, David Cadotte, Leodante B da Costa, Rajeesh George, Chris Heyn, Peter Howard, Anish Kapadia, Jesse M Klostranec, Nicolas Phan, Gamaliel Tan, Todd G Mainprize, Albert Yee, Victor X D Yang
BACKGROUND CONTEXT: Spinal intra-operative computer-assisted navigation (CAN) may guide pedicle screw placement. CAN techniques have been reported to reduce pedicle screw breach rates across all spinal levels. However, definitions of screw breach vary widely across studies, if reported at all. The absolute quantitative error of spinal navigation systems is theoretically a more precise and generalizable metric of navigation accuracy. It has also been computed variably, and reported in fewer than a quarter of clinical studies of CAN-guided pedicle screw accuracy...
October 21, 2016: Spine Journal: Official Journal of the North American Spine Society
Mehmet Emin Kaval, Ismail Davut Capar, Hüseyin Ertas
INTRODUCTION: The purpose of this study was to evaluate the cyclic fatigue and torsional resistance of Hyflex EDM, ProTaper Gold (PTG), and ProTaper Universal (PTU) instruments. METHODS: For the cyclic fatigue test, 10 instruments from each group were tested by using a stainless steel block with 1.5-mm diameter and 3-mm radius of 60° angle of curvature. The instruments were allowed to rotate by using a low-torque motor, and number of cycles from the beginning to the fracture was recorded...
October 21, 2016: Journal of Endodontics
Franziska R Richter, Rose A Cooper, Paul M Bays, Jon S Simons
A network of brain regions have been linked with episodic memory retrieval, but limited progress has been made in identifying the contributions of distinct parts of the network. Here, we utilized continuous measures of retrieval to dissociate three components of episodic memory: retrieval success, precision, and vividness. In the fMRI scanner, participants encoded objects that varied continuously on three features: color, orientation, and location. Participants' memory was tested by having them recreate the appearance of the object features using a continuous dial, and continuous vividness judgments were recorded...
October 25, 2016: ELife
Boqian Sun, Shunyue Wang, Haixia Li, Xiaoxia He
A micromachined gyroscope in which a high-speed spinning rotor is suspended electrostatically in a vacuum cavity usually functions as a dual-axis angular rate sensor. An inherent coupling error between the two sensing axes exists owing to the angular motion of the spinning rotor being controlled by a torque-rebalance loop. In this paper, a decoupling compensation method is proposed and investigated experimentally based on an electrostatically suspended micromachined gyroscope. In order to eliminate the negative spring effect inherent in the gyroscope dynamics, a stiffness compensation scheme was utilized in design of the decoupled rebalance loop to ensure loop stability and increase suspension stiffness...
October 20, 2016: Sensors
Caspar M Goeke, Serena Planera, Holger Finger, Peter König
A large number of studies suggest that the integration of multisensory signals by humans is well-described by Bayesian principles. However, there are very few reports about cue combination between a native and an augmented sense. In particular, we asked the question whether adult participants are able to integrate an augmented sensory cue with existing native sensory information. Hence for the purpose of this study, we build a tactile augmentation device. Consequently, we compared different hypotheses of how untrained adult participants combine information from a native and an augmented sense...
2016: Frontiers in Behavioral Neuroscience
Marcel M Rossi, Jacqueline Alderson, Amar El-Sallam, James Dowling, Jeffrey Reinbolt, Cyril J Donnelly
The aims of this study were to: (i) establish a new criterion method to validate inertia tensor estimates by setting the experimental angular velocity data of an airborne objects as ground truth against simulations run with the estimated tensors, and (ii) test the sensitivity of the simulations to changes in the inertia tensor components. A rigid steel cylinder was covered with reflective kinematic markers and projected through a calibrated motion capture volume. Simulations of the airborne motion were run with two models, using inertia tensor estimated with geometric formula or the compound pendulum technique...
October 15, 2016: Journal of Biomechanics
Huawang Wu, Hui Sun, Chao Wang, Lin Yu, Yilan Li, Hongjun Peng, Xiaobing Lu, Qingmao Hu, Yuping Ning, Tianzi Jiang, Jinping Xu, Jiaojian Wang
Major depressive disorder (MDD) is a common psychiatric disorder that is characterized by cognitive deficits and affective symptoms. To date, an increasing number of neuroimaging studies have focused on emotion regulation and have consistently shown that emotion dysregulation is one of the central features and underlying mechanisms of MDD. Although gray matter morphological abnormalities in regions within emotion regulation networks have been identified in MDD, the interactions and relationships between these gray matter structures remain largely unknown...
October 6, 2016: Journal of Psychiatric Research
Alexey N Boychuk, Dmitriy V Makarov, Alexander N Zakhlevnykh
We theoretically study the dynamics of the orientational structure of a ferronematic liquid crystal with soft planar coupling between the director and the magnetization in a rotating magnetic field. We determine critical parameters characterizing the boundary between synchronous and asynchronous rotation regimes. We show that the magnetic impurity increases the stability threshold of an asynchronous rotation regime. The critical angular velocity, the angles of the director and the magnetization rotation in each regime of orientational structure rotation are found for rigid planar coupling...
October 2016: European Physical Journal. E, Soft Matter
Francesca Bocca, Thomas Töllner, Hermann J Müller, Paul C Taylor
No abstract text is available yet for this article.
October 14, 2016: Brain Stimulation
Hugo Larocque, Frédéric Bouchard, Vincenzo Grillo, Alicia Sit, Stefano Frabboni, Rafal E Dunin-Borkowski, Miles J Padgett, Robert W Boyd, Ebrahim Karimi
Free electrons with a helical phase front, referred to as "twisted" electrons, possess an orbital angular momentum (OAM) and, hence, a quantized magnetic dipole moment along their propagation direction. This intrinsic magnetic moment can be used to probe material properties. Twisted electrons thus have numerous potential applications in materials science. Measuring this quantity often relies on a series of projective measurements that subsequently change the OAM carried by the electrons. In this Letter, we propose a nondestructive way of measuring an electron beam's OAM through the interaction of this associated magnetic dipole with a conductive loop...
October 7, 2016: Physical Review Letters
Jennifer Trinh, Ekkes Brück, Theo Siegrist, Rebecca Flint, Premala Chandra, Piers Coleman, Arthur P Ramirez
The heavy fermion compound URu_{2}Si_{2} continues to attract great interest due to the unidentified hidden order it develops below 17.5 K. The unique Ising character of the spin fluctuations and low-temperature quasiparticles is well established. We present detailed measurements of the angular anisotropy of the nonlinear magnetization that reveal a cos^{4}θ Ising anisotropy both at and above the ordering transition. With Landau theory, we show this implies a strongly Ising character of the itinerant hidden order parameter...
October 7, 2016: Physical Review Letters
Yin-Shan Meng, Shang-Da Jiang, Bing-Wu Wang, Song Gao
Single-molecule magnets (SMMs) can retain their magnetization status preferentially after removal of the magnetic field below a certain temperature. The unique property, magnetic bistable status, enables the molecule-scale SMM to become the next-generation high-density information storage medium. SMMs' new applications are also involved in high-speed quantum computation and molecular spintronics. The development of coordination chemistry, especially in transition metal (3d) and lanthanide (4f) complexes, diversifies SMMs by introducing new ones...
October 21, 2016: Accounts of Chemical Research
Dennis Hey, Eugene Tze Chun Lau, Joel-Louis Lim, Denise Choong, Chuen-Seng Tan, Gabriel Ka-Po Liu, Hee-Kit Wong
BACKGROUND CONTEXT: Flexion radiographs have been used to identify cases of spinal instability. However, current methods are not standardized and are not sufficiently sensitive/specific to identify instability. PURPOSE: Introduction of a new slump sitting method for performing lumbar spine flexion radiographs and comparison of the angular range of motions and displacements between the conventional method and this new method. STUDY DESIGN: Prospective study on radiologic evaluation of the lumbar spine flexion range of motions and displacements using dynamic radiographs PATIENT SAMPLE: 60 patients were recruited from a single spine tertiary centre...
October 17, 2016: Spine Journal: Official Journal of the North American Spine Society
Rick Morrison, Zhaohua Zheng, Ian G Jennings, Philip E Thompson, Jasim M A Al-Rawi
To continue our study of 2-morpholino-benzoxazine based compounds, which show useful activity against PI3K family enzymes or antiplatelet activity, we designed and synthesized a series of linear 6.7-fused, 5,6-angular fused and 7,8-angular fused-aryl-morpholino-naphth-oxazines. The compounds were prepared from substituted 2-hydroxynaphthoic acid to give the corresponding thioxo analogues 8, 9, 15 and 19. The thioxo products were then converted to the morpholino substituted analogue. The aryl group was introduced by Suzuki coupling of bromo precursors...
October 5, 2016: Bioorganic & Medicinal Chemistry Letters
Luigi Maria Galantucci, Roberto Deli, Alberto Laino, Eliana Di Gioia, Raoul D'Alessio, Fulvio Lavecchia, Gianluca Percoco, Carmela Savastano
The aim of this paper is to develop a database to determine a new biomorphometric standard of attractiveness. Sampling was carried out using noninvasive three-dimensional relief methods to measure the soft tissues of the face. These anthropometric measurements were analyzed to verify the existence of any canons with respect to shape, size, and measurement proportions which proved to be significant with regard to the aesthetics of the face. Finally, the anthropometric parameters obtained were compared with findings described in the international literature...
October 2016: Journal of Craniofacial Surgery
Cherie Walker, Peter Sinclair, Kenneth Graham, Stephen Cobley
Inertial Measurement Units (IMUs) may offer an ecologically valid, reliable, and practical method for biomechanical performance analysis. With such potential in mind, Part 1 of this study examined the accuracy of IMUs gyroscopes with an optical system (Cortex 3.3). A calibration formula standardised the IMUs angular velocity output with the optical system. The percentage differences between the two measures = 0.5% (p < 0.05), suggest IMU's efficacy for application. In Part 2, the aim was to examine and understand how dive flight angular velocity time series plots change and increase according to dive degree of difficulty...
October 20, 2016: Sports Biomechanics
Xueye Wang, Zihua Tang, Jing Wu, Xinhua Wu, Yiqun Wu, Xinying Zhou
Archeological researches have proposed arguments for human mobility and long-distance trading over the Eurasia before the Silk Roads. Here we utilize biologically available strontium isotope analysis to assess the extent of pre-Silk Road population movements and cultural communications across the Asian interior. From an early Iron Age cemetery (ca. 2500 yr B.P.) on the eastern Pamir Plateau, mean (87)Sr/(86)Sr ratios from 34 individuals display considerable isotopic variability, and 10 individuals are distinguished as migrants based on the local strontium isotope range of 0...
October 20, 2016: Scientific Reports
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