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https://www.readbyqxmd.com/read/28437618/state-of-the-art-calculations-of-sublimation-enthalpies-for-selected-molecular-crystals-and-their-computational-uncertainty
#1
Ctirad Červinka, Michal Fulem
A computational methodology for calculation of sublimation enthalpies of molecular crystals from first principles is developed and validated by comparison to critically evaluated literature experimental data. Temperature dependent sublimation enthalpies for a set of selected 22 molecular crystals in their low-temperature phases are calculated. The computational methodology consists in several building blocks based on high level electronic structure methods of quantum chemistry and statistical thermodynamics...
April 24, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28433558/spatial-relationship-of-organized-rotational-and-focal-sources-in-human-atrial-fibrillation-to-autonomic-ganglionated-plexi
#2
Tina Baykaner, Theodoros A Zografos, Junaid A B Zaman, Ioannis Pantos, Mahmood Alhusseini, Rachita Navara, David E Krummen, Sanjiv M Narayan, Demosthenes G Katritsis
BACKGROUND: One approach to improve ablation for atrial fibrillation (AF) is to focus on physiological targets including focal or rotational sources or ganglionic plexi (GP). However, the spatial relationship between these potential mechanisms has never been studied. We tested the hypothesis that rotors and focal sources for AF may co-localize with ganglionated plexi (GP). METHODS: We prospectively identified locations of AF rotors and focal sources, and correlated these to GP sites in 97 consecutive patients (age 59...
April 19, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28430305/turbulence-measurements-in-an-axial-rotary-blood-pump-with-laser-doppler-velocimetry
#3
Chan Y Schüle, Klaus Affeld, Max Kossatz, Christian O Paschereit, Ulrich Kertzscher
BACKGROUND: The implantation of rotary blood pumps as ventricular assist devices (VADs) has become a viable therapy for quite a number of patients with end-stage heart failure. However, these rotary blood pumps cause adverse events that are related to blood trauma. It is currently believed that turbulence in the pump flow plays a significant role. But turbulence has not been measured to date because there is no optical access to the flow space in rotary blood pumps because of their opaque casings...
April 18, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28421870/collaborative-study-on-the-effect-of-grinding-on-the-detection-of-bones-from-processed-animal-proteins-in-feed-by-light-microscopy
#4
Pascal Veys, Viviane Planchon, Ruairi Colbert, Clara Cruz, Geneviève Frick, Ioannis Ioannou, Daniela Marchis, Erik Nordkvist, Inge Paradies-Severin, Arja Pohto, Roland Weiss, Vincent Baeten, Gilbert Berben
Bone fragments are essential structures for the detection of processed animal proteins (PAPs) in feed by light microscopy for official controls according to Annex VI of European Union Regulation EC/152/2009. The preparation of samples submitted for analysis requires a grinding step to make them suitable for microscopic slide preparation and observation. However, there are no technical guidelines set down for this step despite the fact that it can lead to an increase in bone numbers due to fragmentation. This was demonstrated by an in-house study carried out by the Irish National Reference Laboratory (NRL) for animal protein detection...
April 19, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28420534/adaptive-compensation-control-for-attitude-adjustment-of-quad-rotor-unmanned-aerial-vehicle
#5
Zhankui Song, Kaibiao Sun
A compensation control strategy based on adaptive back-stepping technique is presented to address the problem of attitude adjustment for a quad-rotor unmanned aerial vehicle (QR- UAV) with inertia parameter uncertainties, the limited airflow disturbance and the partial loss of rotation speed effectiveness. In the design process of control system, adaptive estimation technique is introduced into the closed loop system in order to compensate the lumped disturbance term. More specifically, the designed controller utilizes "prescribed performance bounds" method, and therefore guarantees the transient performance of tracking errors, even in the presence of the lumped disturbance...
April 15, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28416542/high-resolution-melting-analysis-for-the-rapid-detection-of-sequence-type-131-escherichia-coli
#6
Lucas B Harrison, Nancy D Hanson
IntroductionE. coli belonging to sequence type 131 clonal complex (ST131) have been associated with the global distribution of fluoroquinolone and β-lactam resistance. Whole genome sequencing and multi-locus sequence typing identify sequence type but are expensive when evaluating large numbers of samples. This study was designed to develop a cost-effective screening tool using high resolution melting (HRM) analysis to differentiate ST131 from non-ST-131 E. coli in large sample populations in the absence of sequence analysis...
April 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28414364/experimental-analysis-of-stress-fields-of-rotating-structural-elements-by-means-of-reflection-photoelasticity
#7
Peter Frankovský, Oskar Ostertag, Eva Ostertagová, František Trebuňa, Ján Kostka, Marek Výrostek
The subject of this paper is an experimental stress analysis of a rotor with a symmetrical arm end and a rotor with an asymmetrical arm end. The main aim of this paper is to test the application of the Harmonic Star Method software developed by the authors. This software analyzes stress states in rotating structural elements. The stress state of the analyzed rotors is caused by centrifugal forces. The experiment was carried out by means of reflection photoelasticity, and the experimental solution was focused on periodical dynamic effects, which required the use of stroboscopic white light...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28408605/nanoscale-length-control-of-the-flagellar-driveshaft-requires-hitting-the-tethered-outer-membrane
#8
Eli J Cohen, Josie L Ferreira, Mark S Ladinsky, Morgan Beeby, Kelly T Hughes
The bacterial flagellum exemplifies a system where even small deviations from the highly regulated flagellar assembly process can abolish motility and cause negative physiological outcomes. Consequently, bacteria have evolved elegant and robust regulatory mechanisms to ensure that flagellar morphogenesis follows a defined path, with each component self-assembling to predetermined dimensions. The flagellar rod acts as a driveshaft to transmit torque from the cytoplasmic rotor to the external filament. The rod self-assembles to a defined length of ~25 nanometers...
April 14, 2017: Science
https://www.readbyqxmd.com/read/28408329/highest-dominant-frequency-and-rotor-positions-are-robust-markers-of-driver-location-during-non-invasive-mapping-of-atrial-fibrillation-a-computational-study
#9
Miguel Rodrigo, Andreu M Climent, Alejandro Liberos, Francisco Fernández-Avilés, Omer Berenfeld, Felipe Atienza, Maria S Guillem
BACKGROUND: Dominant Frequency (DF) and rotor mapping have been proposed as non-invasive techniques to guide localization of drivers maintaining atrial fibrillation (AF). OBJECTIVE: To evaluate the robustness of both techniques in identifying atrial drivers non-invasively under the effect of electrical noise or model uncertainties. METHODS: Inverse-computed DFs and phase maps were obtained on 30 different mathematical AF simulations. Epicardial Highest DF (HDF) regions and rotor location were compared with the same inverse-computed measurements after addition of noise to the ECG, size variations of the atria and linear or angular deviations in the atrial location inside the thorax...
April 10, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28393898/robust-rotation-of-rotor-in-a-thermally-driven-nanomotor
#10
Kun Cai, Jingzhou Yu, Jiao Shi, Qing-Hua Qin
In the fabrication of a thermally driven rotary nanomotor with the dimension of a few nanometers, fabrication and control precision may have great influence on rotor's stability of rotational frequency (SRF). To investigate effects of uncertainty of some major factors including temperature, tube length, axial distance between tubes, diameter of tubes and the inward radial deviation (IRD) of atoms in stators on the frequency's stability, theoretical analysis integrating with numerical experiments are carried out...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28393279/non-equilibrium-hydrogen-exchange-for-determination-of-h-bond-strength-and-water-accessibility-in-solid-proteins
#11
Kristof Grohe, Kumar Tekwani Movellan, Suresh Kumar Vasa, Karin Giller, Stefan Becker, Rasmus Linser
We demonstrate measurement of non-equilibrium backbone amide hydrogen-deuterium exchange rates (HDX) for solid proteins. The target of this study are the slowly exchanging residues in solid samples, which are associated with stable secondary-structural elements of proteins. These hydrogen exchange processes escape methods measuring equilibrium exchange rates of faster processes. The method was applied to a micro-crystalline preparation of the SH3 domain of chicken α-spectrin. Therefore, from a 100% back-exchanged micro-crystalline protein preparation, the supernatant buffer was exchanged by a partially deuterated buffer to reach a final protonation level of approximately 20% before packing the sample in a 1...
April 9, 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28389956/stoichiometry-and-turnover-of-the-stator-and-rotor
#12
Yusuke V Morimoto, Tohru Minamino
Fluorescence imaging techniques using green fluorescent protein (GFP) and related fluorescent proteins are utilized to monitor and analyze a wide range of biological processes in living cells. Stepwise photobleaching experiments can determine the stoichiometry of protein complexes. Fluorescence recovery after photobleaching (FRAP) experiments can reveal in vivo dynamics of biomolecules. In this chapter, we describe methods to detect the subcellular localization, stoichiometry, and turnovers of stator and rotor components of the Salmonella flagellar motor...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28388144/molecular-symmetry-group-analysis-of-the-low-wavenumber-torsions-and-vibration-torsions-in-the-s1-state-and-ground-state-cation-of-p-xylene-an-investigation-using-resonance-enhanced-multiphoton-ionization-rempi-and-zero-kinetic-energy-zeke-spectroscopy
#13
Adrian M Gardner, William D Tuttle, Peter Groner, Timothy G Wright
For the first time, a molecular symmetry group (MSG) analysis has been undertaken in the investigation of the electronic spectroscopy of p-xylene (p-dimethylbenzene). Torsional and vibration-torsional (vibtor) levels in the S1 state and ground state of the cation of p-xylene are investigated using resonance-enhanced multiphoton ionization (REMPI) and zero-kinetic-energy (ZEKE) spectroscopy. In the present work, we concentrate on the 0-350 cm(-1) region, where there are a number of torsional and vibtor bands and we discuss the assignment of this region...
March 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28383023/demystifying-rotors-and-their-place-in-clinical-translation-of-atrial-fibrillation-mechanisms
#14
REVIEW
Stanley Nattel, Feng Xiong, Martin Aguilar
Treatment of atrial fibrillation (AF), the most common arrhythmia in clinical practice, remains challenging. Improved understanding of underlying mechanisms is needed to improve therapy. Functional re-entry is central to AF maintenance. The first detailed, quantitative theory of functional re-entry, the 'leading circle' model, was developed 40 years ago. Subsequently, an alternative paradigm based on 'spiral waves' has evolved. Spiral-wave generators, or 'rotors', have been identified using advanced mapping methods in experimental and clinical AF...
April 6, 2017: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/28382228/a-novel-pm-motor-with-hybrid-pm-excitation-and-asymmetric-rotor-structure-for-high-torque-performance
#15
Gaohong Xu, Guohai Liu, Xinxin Du, Fangfang Bian
This paper proposes a novel permanent magnet (PM) motor for high torque performance, in which hybrid PM material and asymmetric rotor design are applied. The hybrid PM material is adopted to reduce the consumption of rare-earth PM because ferrite PM is assisted to enhance the torque production. Meanwhile, the rotor structure is designed to be asymmetric by shifting the surface-insert PM (SPM), which is used to improve the torque performance, including average torque and torque ripple. Moreover, the reasons for improvement of the torque performance are explained by evaluation and analysis of the performances of the proposed motor...
May 2017: AIP Advances
https://www.readbyqxmd.com/read/28375189/elimination-of-harmonic-force-and-torque-in-active-magnetic-bearing-systems-with-repetitive-control-and-notch-filters
#16
Xiangbo Xu, Shao Chen, Jinhao Liu
Harmonic force and torque, which are caused by rotor imbalance and sensor runout, are the dominant disturbances in active magnetic bearing (AMB) systems. To eliminate the harmonic force and torque, a novel control method based on repetitive control and notch filters is proposed. Firstly, the dynamics of a four radial degrees of freedom AMB system is described, and the AMB model can be described in terms of the translational and rotational motions, respectively. Next, a closed-loop generalized notch filter is utilized to identify the synchronous displacement resulting from the rotor imbalance, and a feed-forward compensation of the synchronous force and torque related to the AMB displacement stiffness is formulated by using the identified synchronous displacement...
April 4, 2017: Sensors
https://www.readbyqxmd.com/read/28372403/design-and-application-of-a-novel-high-precision-and-low-cost-electronic-tachogenerator-for-sensor-based-brushless-direct-current-motor-drivers
#17
Mehmet Cihat Ozgenel, Gungor Bal, Durmus Uygun
This study presents a precise speed control method for Brushless Direct Current (BLDC) Motors using an electronic tachogenerator (ETg) instead of an electro-mechanical tachogenerator. Most commonly used three-phase BLDC motors have three position sensors for rotor position data to provide commutation among stator windings. Aforementioned position sensors are usually Hall-effect sensors delivering binary-high and binary-low data as long as the motor rotates. These binary sets from three Hall-effect sensors can be used as an analogue rotor speed signal for closed loop applications...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28369344/first-endocardial-rotor-ablation-using-a-64-pole-basket-catheter-in-a-patient-with-a-left-atrial-appendage-closure-device
#18
Barbara Bellmann, Mario Kasner, Ulf Landmesser, Andreas Rillig
No abstract text is available yet for this article.
March 21, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28365287/properties-of-gelatin-based-films-incorporated-with-chitosan-coated-microparticles-charged-with-rutin
#19
Ilyes Dammak, Ana Mônica Quinta Barbosa Bittante, Rodrigo Vinicius Lourenço, Paulo José do Amaral Sobral
The aim of this study was development an active film based on gelatin incorporated with antioxidant, rutin carried into microparticles. The complexation between oppositely charged lecithin and chitosan was applied to prepare the chitosan-coated microparticles. The generated microparticles had an average size of 520±4nm and a span of 0.3 were formulated by a rotor-stator homogenize at the homogenization speed 10,000rpm. Composite films were prepared by incorporating chitosan-coated microparticles, at various concentrations (0...
March 30, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28364320/repetitive-atrial-activation-during-ongoing-atrial-fibrillation-comparison-using-different-mapping-algorithms-preliminary-findings
#20
Philipp Halbfass, Patrick Müller, Karin Nentwich, Kai Sonne, Karsten Hamm, Sebastian Barth, Franziska Fochler, Andreas Mügge, Thomas Deneke
PURPOSE: Targeting repetitive sources identified during atrial fibrillation (focal impulse and rotor modulation, FIRM) has been used as an ablation strategy using specific mapping tools. Aim of this study was to evaluate FIRM mapped rotors with a new multipolar mapping algorithm. METHODS: Patients with persistent atrial fibrillation undergoing FIRM ablation were included. Mapping of left atrial rotors was performed with a 64-pole basket catheter in conjunction with a specialized phase mapping algorithm...
March 31, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
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