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https://www.readbyqxmd.com/read/28094386/a-universal-mechanism-of-the-planar-boron-rotors-b11-b13-b15-and-b19-inner-wheels-rotating-in-pseudo-rotating-outer-bearings
#1
Yonggang Yang, Dongming Jia, Ying-Jin Wang, Hua-Jin Zhai, Yuan Man, Si-Dian Li
Planar boron clusters B11(-), B13(+), B15(+), and B19(-) have been introduced recently as molecular Wankel motors or tank treads. Here we present a universal mechanism for these dynamically fluxional clusters; that is, they are molecular rotors with inner wheels that rotate almost freely in pseudo-rotating outer bearings, analogous to rotating molecules trapped in pseudo-rotating cages. This mechanism has significant quantum mechanical consequences: the global-minimum structures of the clusters have C2v symmetry, whereas the wheels rotating in pseudo-rotating bearings generate rosette-type shapes with D9h, D10h, D11h, and D13h symmetries...
January 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28093580/observation-of-a-metal-centered-b2-ta-b18-tubular-molecular-rotor-and-a-perfect-ta-b20-boron-drum-with-the-record-coordination-number-of-twenty
#2
Wan-Lu Li, Tian Jian, Xin Chen, Hai-Ru Li, Teng-Teng Chen, Xue-Mei Luo, Si-Dian Li, Jun Li, Lai-Sheng Wang
A tubular molecular rotor B2-Ta@B18(-) (1) and boron drum Ta@B20(-) (2) with the highest coordination number of twenty in chemistry are observed via a joint photoelectron spectroscopy and first-principles theory investigation.
January 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28093202/sensorless-h%C3%A2-speed-tracking-synthesis-for-surface-mount-permanent-magnet-synchronous-motor
#3
Ramón Ramírez-Villalobos, Luis T Aguilar, Luis N Coria
In this paper, a sensorless speed tracking control is proposed for a surface-mount permanent magnet synchronous motor by using a nonlinear H∞-controller via stator currents measurements for feedback. An output feedback nonlinear H∞-controller was designed such that the undisturbed system is uniformly asymptotically stable around the desired speed reference, while also the effects of external vanishing and non-vanishing disturbances, noise, and input backlash were attenuated locally. The rotor position was calculated from the causal dynamic output feedback compensator and from the desired speed reference...
January 13, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28089911/atypical-composition-and-structure-of-the-mitochondrial-dimeric-atp-synthase-from-euglena-gracilis
#4
K N Sathish Yadav, Héctor V Miranda-Astudillo, Lilia Colina-Tenorio, Fabrice Bouillenne, Hervé Degand, Pierre Morsomme, Diego González-Halphen, Egbert J Boekema, Pierre Cardol
Mitochondrial respiratory-chain complexes from Euglenozoa comprise classical subunits described in other eukaryotes (i.e. mammals and fungi) and subunits that are restricted to Euglenozoa (e.g. Euglena gracilis and Trypanosoma brucei). Here we studied the mitochondrial F1FO-ATP synthase (or Complex V) from the photosynthetic eukaryote E. gracilis in detail. The enzyme was purified by a two-step chromatographic procedure and its subunit composition was resolved by a three-dimensional gel electrophoresis (BN/SDS/SDS)...
January 12, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28089452/co-folding-of-a-flif-flig-split-domain-forms-the-basis-of-the-ms-c-ring-interface-within-the-bacterial-flagellar-motor
#5
Michael J Lynch, Robert Levenson, Eun A Kim, Ria Sircar, David F Blair, Frederick W Dahlquist, Brian R Crane
The interface between the membrane (MS) and cytoplasmic (C) rings of the bacterial flagellar motor couples torque generation to rotation within the membrane. The structure of the C-terminal helices of the integral membrane protein FliF (FliFC) bound to the N terminal domain of the switch complex protein FliG (FliGN) reveals that FliGN folds around FliFC to produce a topology that closely resembles both the middle and C-terminal domains of FliG. The interface is consistent with solution-state nuclear magnetic resonance, small-angle X-ray scattering, in vivo interaction studies, and cellular motility assays...
December 31, 2016: Structure
https://www.readbyqxmd.com/read/28076418/sensorless-modeling-of-varying-pulse-width-modulator-resolutions-in-three-phase-induction-motors
#6
Matthew David Marko, Glenn Shevach
A sensorless algorithm was developed to predict rotor speeds in an electric three-phase induction motor. This sensorless model requires a measurement of the stator currents and voltages, and the rotor speed is predicted accurately without any mechanical measurement of the rotor speed. A model of an electric vehicle undergoing acceleration was built, and the sensorless prediction of the simulation rotor speed was determined to be robust even in the presence of fluctuating motor parameters and significant sensor errors...
2017: PloS One
https://www.readbyqxmd.com/read/28071906/single-conformation-spectroscopy-of-suberoylanilide-hydroxamic-acid-saha-a-molecule-bites-its-tail
#7
Di Zhang, Karl N Blodgett, Xiao Zhu, Timothy S Zwier
Suberoylanilide hydroxamic acid (C6H5NHCO(CH2)6CONHOH, SAHA) is a histone deacetylase inhibitor that causes growth arrest and differentiation of many tumor types and is an approved drug for the treatment of cancer. With a hydrogen-bonding amide group adjacent to its phenyl ring "head", and a hydroxamic acid group at the "tail" end of a C6 alkyl chain linker, SAHA possesses an interesting potential energy landscape to be probed by single-conformation methods. The alkyl chain's preference for extended structures is in competition with tail-to-head (T-H) or head-to-tail (H-T) hydrogen bonds between the amide and hydroxamic acid groups...
January 10, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28070082/evaluation-of-structural-isomers-molecular-interactions-reactivity-descriptors-and-vibrational-analysis-of-tretinoin
#8
T Karthick, Poonam Tandon, Swapnil Singh
Tretinoin is known to be a pharmaceutical drug for treating acne vulgaris, keratosis pilaris, and acute promyelocytic leukemia. In order to reveal the possible conformers of tretinoin, the energies of all the conformers through rotational bonds have been evaluated by systematic rotor search analysis. The intramolecular interactions ranging from strong hydrogen bonds to weak van der Waals forces present in tretinoin have been distinguished with the help of electron density mapping and wavefunction analysis. The global reactivity descriptors and Fukui functions of tretinoin have been calculated and discussed...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28067047/solvatochromic-and-fluorogenic-dyes-as-environment-sensitive-probes-design-and-biological-applications
#9
Andrey S Klymchenko
Fluorescent environment-sensitive probes are specially designed dyes that change their fluorescence intensity (fluorogenic dyes) or color (e.g., solvatochromic dyes) in response to change in their microenvironment polarity, viscosity, and molecular order. The studies of the past decade, including those of our group, have shown that these molecules become universal tools in fluorescence sensing and imaging. In fact, any biomolecular interaction or change in biomolecular organization results in modification of the local microenvironment, which can be directly monitored by these types of probes...
January 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28060324/measurement-of-outgassing-rates-of-steels
#10
Chongdo Park, Se-Hyun Kim, Sanghoon Ki, Taekyun Ha, Boklae Cho
Steels are commonly used materials in the fabrication of vacuum systems because of their good mechanical, corrosion, and vacuum properties. A variety of steels meet the criterion of low outgassing required for high or ultrahigh vacuum applications. However, a given material can present different outgassing rates depending on its manufacturing process or the various pretreatment processes involved during the fabrication. Thus, the measurement of outgassing rates is highly desirable for a specific vacuum application...
December 13, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28056567/development-of-a-fast-lean-and-agile-direct-pelletization-process-using-experimental-design-techniques
#11
Stavros N Politis, Dimitrios M Rekkas
A novel hot melt direct pelletization method was developed, characterized and optimized, using statistical thinking and experimental design tools. Mixtures of carnauba wax (CW) and HPMC K100M were spheronized using melted gelucire 50-13 as a binding material (BM). Experimentation was performed sequentially; a fractional factorial design was set up initially to screen the factors affecting the process, namely spray rate, quantity of BM, rotor speed, type of rotor disk, lubricant-glidant presence, additional spheronization time, powder feeding rate and quantity...
January 5, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28055918/stability-of-rotor-hopfield-neural-networks-with-synchronous-mode
#12
Masaki Kobayashi
A complex-valued Hopfield neural network (CHNN) is a model of a Hopfield neural network using multistate neurons. The stability conditions of CHNNs have been widely studied. A CHNN with a synchronous mode will converge to a fixed point or a cycle of length 2. A rotor Hopfield neural network (RHNN) is also a model of a multistate Hopfield neural network. RHNNs have much higher storage capacity and noise tolerance than CHNNs. We extend the theories regarding the stability of CHNNs to RHNNs. In addition, we investigate the stability of RHNNs with the projection rule...
December 29, 2016: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28049775/synchronization-of-budding-yeast-by-centrifugal-elutriation
#13
Adam P Rosebrock
In yeast, cell size is normally tightly linked to cell cycle progression. Centrifugal elutriation is a method that fractionates cells based on the physical properties of cell size-fluid drag and buoyant density. Using a specially modified centrifuge and rotor system, cells can be physically separated into one or more cohorts of similar size and therefore cell cycle position. Small G1 daughters are collected first, followed by successively larger cells. Elutriated populations can be analyzed immediately or can be returned to medium and permitted to synchronously progress through the cell cycle...
January 3, 2017: Cold Spring Harbor Protocols
https://www.readbyqxmd.com/read/28049583/purification-of-semiconducting-single-walled-carbon-nanotubes-by-spiral-counter-current-chromatography
#14
Martha Knight, Rodrigo Lazo-Portugal, Saeyoung Nate Ahn, Steingrimur Stefansson
Over the last decade man-made carbon nanostructures have shown great promise in electronic applications, but they are produced as very heterogeneous mixtures with different properties so the achievement of a significant commercial application has been elusive. The dimensions of single-wall carbon nanotubes are generally a nanometer wide, up to hundreds of microns long and the carbon nanotubes have anisotropic structures. They are processed to have shorter lengths but they need to be sorted by diameter and chirality...
December 24, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28049339/relocking-of-intrinsic-angular-momenta-in-collisions-of-diatoms-with-ions-capture-of-h2-j-0-1-by-h2
#15
E I Dashevskaya, I Litvin, E E Nikitin, J Troe
Rate coefficients for capture of H2(j = 0,1) by H2(+) are calculated in perturbed rotor approximation, i.e., at collision energies considerably lower than Bhc (where B denotes the rotational constant of H2). The results are compared with the results from an axially nonadiabatic channel (ANC) approach, the latter providing a very good approximation from the low-temperature Bethe-Wigner to the high temperature Langevin limit. The classical ANC approximation performs satisfactorily at temperatures above 0.1 K...
December 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28040435/in-vitro-investigation-of-the-hemodynamic-responses-of-the-cerebral-coronary-and-renal-circulations-with-a-rotary-blood-pump-installed-in-the-descending-aorta
#16
M A Rezaienia, G Paul, E J Avital, S Mozafari, M Rothman, T Korakianitis
This study investigates the hemodynamic responses of the cardiovascular system when a rotary blood pump is operating in the descending aorta, with a focus on the cerebral, coronary and renal autoregulation, using our in-house cardiovascular emulator. Several improvements have been made from our previous studies. A novel coronary system was developed to replicate the native coronary perfusion. Three pinch valves actuated by stepper motors were used to simulate the regional autoregulation systems of the native cerebral, coronary and renal circulations...
December 28, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28039924/focal-impulse-and-rotor-modulation-for-the-treatment-of-atrial-fibrillation-locations-and-one-year-outcomes-of-human-rotors-identified-using-a-64-electrode-basket-catheter
#17
Roland Richard Tilz, Tina Lin, Andreas Rillig, Christian-H Heeger, Leonie Scholz, Peter Wohlmuth, Tudor Bucur, Andreas Metzner, Shibu Mathew, Erik Wissner, Feifan Ouyang, Karl-Heinz Kuck
INTRODUCTION: Pulmonary vein isolation (PVI) is currently the gold standard for catheter ablation of atrial fibrillation (AF). The mechanism for AF-maintenance is still controversial. The concept of rapidly-activating spiral rotors perpetuating AF has led to the development of several rotor-mapping systems. We present our experience with focal impulse and rotor modulation (FIRM) using a 64-electrode basket catheter and computational system and evaluate its feasibility in conjunction with PVI to treat AF...
December 31, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28032745/biobased-high-performance-rotary-micromotors-for-individually-reconfigurable-micromachine-arrays-and-microfluidic-applications
#18
Kwanoh Kim, Zexi Liang, Minliang Liu, Donglei Emma Fan
In this work, we report an innovative type of rotary bio-micromachines by using diatom frustules as integrated active components, including the assembling, operation, and performance characterization. We further investigate and demonstrate unique applications of the bio-micromachines in achieving individually reconfigurable micromachine arrays and microfluidic mixing. Diatom frustules are porous cell walls of diatoms made of silica. We assembled rotary micromachines consisting of diatom frustules serving as rotors and patterned magnets serving as bearings in electric fields...
December 29, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28031354/intra-arterial-nitroglycerin-as-directed-acute-treatment-in-experimental-ischemic-stroke
#19
Michael E Maniskas, Jill M Roberts, Rebecca Trueman, Annastazia E Learoyd, Amanda Gorman, Justin F Fraser, Gregory J Bix
BACKGROUND: Nitroglycerin (also known as glyceryl trinitrate (GTN)), a vasodilator best known for treatment of ischemic heart disease, has also been investigated for its potential therapeutic benefit in ischemic stroke. The completed Efficacy of Nitric Oxide in Stroke trial suggested that GTN has therapeutic benefit with acute (within 6 hours) transdermal systemic sustained release therapy. OBJECTIVE: To examine an alternative use of GTN as an acute therapy for ischemic stroke following successful recanalization...
December 28, 2016: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28028999/automated-nucleic-acid-extraction-systems-for-detecting-cytomegalovirus-and-epstein-barr-virus-using-real-time-pcr-a-comparison-study-between-the-qiasymphony-rgq-and-qiacube-systems
#20
Hanah Kim, Mina Hur, Ji Young Kim, Hee Won Moon, Yeo Min Yun, Hyun Chan Cho
BACKGROUND: Cytomegalovirus (CMV) and Epstein-Barr virus (EBV) are increasingly important in immunocompromised patients. Nucleic acid extraction methods could affect the results of viral nucleic acid amplification tests. We compared two automated nucleic acid extraction systems for detecting CMV and EBV using real-time PCR assays. METHODS: One hundred and fifty-three whole blood (WB) samples were tested for CMV detection, and 117 WB samples were tested for EBV detection...
March 2017: Annals of Laboratory Medicine
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