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https://www.readbyqxmd.com/read/28535051/structural-properties-of-nonionic-monorhamnolipid-aggregates-in-water-studied-by-classical-molecular-dynamics-simulations
#1
Elango Munusamy, Charles M Luft, Jeanne E Pemberton, Steven D Schwartz
Molecular dynamics simulations were carried out to investigate the structure and stabilizing factors of aggregates of the nonionic form of the most common congener of monorhamnolipids, α-rhamnopyranosyl-β-hydroxydecanoyl-β-hydroxydecanoate (Rha- C10-C10), in water. Aggregates of size ranging from 5 monomers to 810 monomers were observed in the simulation forming spherical and ellipsoidal structures, a torus like structure and a unilamellar vesicle. The effects of hydrophobic chain conformation and alignment in the aggregate, role of H-bonds between monomer...
May 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28528920/torus-mandibularis
#2
Tanay Chaubal, Ranjeet Bapat, Kartik Poonja
No abstract text is available yet for this article.
May 18, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28527466/highly-excited-electronic-image-states-of-metallic-nanorings
#3
Christian Fey, Henrik Jabusch, Johannes Knörzer, Peter Schmelcher
We study electronic image states around a metallic nanoring and show that the interplay between the attractive polarization force and a repulsive centrifugal force gives rise to Rydberg-like image states trapped several nanometers away from the surface. The nanoring is modeled as a perfectly conducting isolated torus whose classical electrostatic image potential is derived analytically. The image states are computed via a two-dimensional finite-difference scheme as solutions of the effective Schrödinger equation describing the outer electron subject to this image potential...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28505815/interaction-of-toroidal-swimmers-in-stokes-flow
#4
Jianjun Huang, Lisa Fauci
A doughnut-shaped object supporting surface rotations was a hypothetical construct proposed by both Taylor and Purcell as a swimmer that would be able to propel itself in a Stokesian fluid because of the irreversibility of its stroke. Here we numerically examine the hydrodynamic interaction of pairs and trios of these free toroidal swimmers. First, we study the axisymmetric case of two toroidal swimmers placed in tandem, and show that a single torus of a corotating pair is more efficient than when it swims alone, but less efficient when paired with a counterrotating partner...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505771/counterexamples-to-moffatt-s-statements-on-vortex-knots
#5
Oleg Bogoyavlenskij
One of the well-known problems of hydrodynamics is studied: the problem of classification of vortex knots for ideal fluid flows. In the literature there are known Moffatt statements that all torus knots K_{m,n} for all rational numbers m/n (0<m/n<∞) are realized as vortex knots for each one of the considered axisymmetric fluid flows. We prove that actually such a uniformity does not exist because it does not correspond to the facts. Namely, we derive a complete classification of all vortex knots realized for the fluid flows studied by Moffatt and demonstrate that the real structure of vortex knots is much more rich because the sets of mutually nonisotopic vortex knots realized for different axisymmetric fluid flows are all different...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505281/application-of-partially-substituted-3-5-dimethylphenylcarbamate-3-2-o-%C3%AE-cyclodextrin-2-hydroxypropoxy-propylsilyl-appended-silica-particles-as-chiral-stationary-phase-for-multi-mode-high-performance-liquid-chromatography
#6
Mingxuan Ma, Qunli Wei, Min Meng, Jiale Yin, Lei Du, Xia Zhu, Mengjun Min, Xueyan Zhou, Xiaoxing Yin, Yinhan Gong
A new type of partially substituted 3,5-dimethylphenylcarbamate-(3-(2-O-β-cyclodextrin)-2-hydroxypropoxy)-propylsilyl-appended silica particles (MP-CD-HPS) have been prepared by a convenient post-immobilization derivazition procedure. The MP-CD-HPS has been successfully used as chiral stationary phase (CSP) for high-performance liquid chromatography (HPLC) under normal phase, reversed phase and polar organic mobile phase conditions. The chromatographic evaluation results show that the MP-CD-HPS has excellent selectivity for the separation of aromatic positional isomers and enantiomers of some chiral compounds...
May 13, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28503274/is-it-as-dangerous-as-it-looks
#7
N H Che Ibrahim, N Md Shukri
A common bony protrusion that occurs over the hard palate is sometimes mistaken for a malignancy especially when it is large. This bony growth is a torus palatinus (TP), which is a benign bony prominence over the hard palate. It occurs most commonly in bilateral multiple form, and is often located at the canine to premolar area. A basic knowledge of the assessment and management of TP is important, particularly for the first-line family physician to ensure that the correct information is given to the patient...
2017: Malaysian Family Physician
https://www.readbyqxmd.com/read/28463945/epidemiology-of-fractures-in-children-younger-than-12-months
#8
Diana Rodà, Victoria Trenchs, Ana Isabel Curcoy, Anibal Dolores Martínez, Jordi Pou, Carles Luaces
OBJECTIVES: The aim of this study is to determine the prevalence and characteristics of fractures in young infants attended at the pediatric emergency department (PED). METHODS: This is a retrospective study for 2 years (2011-2012) of children younger than 12 months attended with a fracture at the PED. Age, sex, site and type of fracture, mechanism of injury, time interval before seeking medical attention, and management were analyzed. RESULTS: One hundred one patients were included...
May 1, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28453724/a-generative-angular-model-of-protein-structure-evolution
#9
Michael Golden, Eduardo Garcia-Portugues, Michael Sørensen, Kanti V Mardia, Thomas Hamelryck, Jotun Hein
Recently described stochastic models of protein evolution have demonstrated that the inclusion of structural information in addition to amino acid sequences leads to a more reliable estimation of evolutionary parameters. We present a generative, evolutionary model of protein structure and sequence that is valid on a local length scale. The model concerns the local dependencies between sequence and structure evolution in a pair of homologous proteins. The evolutionary trajectory between the two structures in the protein pair is treated as a random walk in dihedral angle space, which is modeled using a novel angular diffusion process on the two-dimensional torus...
April 27, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28452934/a-genetic-algorithm-for-the-generation-of-packetization-masks-for-robust-image-communication
#10
Katherine Zapata-Quiñones, Cristian Duran-Faundez, Gilberto Gutiérrez, Vincent Lecuire, Christopher Arredondo-Flores, Hugo Jara-Lipán
Image interleaving has proven to be an effective solution to provide the robustness of image communication systems when resource limitations make reliable protocols unsuitable (e.g., in wireless camera sensor networks); however, the search for optimal interleaving patterns is scarcely tackled in the literature. In 2008, Rombaut et al. presented an interesting approach introducing a packetization mask generator based in Simulated Annealing (SA), including a cost function, which allows assessing the suitability of a packetization pattern, avoiding extensive simulations...
April 28, 2017: Sensors
https://www.readbyqxmd.com/read/28448401/clinical-significance-of-incidentally-detected-torus-tubarius-calcification
#11
Karen Buch, Rohini N Nadgir, Muhammad Mustafa Qureshi, Al Ozonoff, Osamu Sakai
OBJECTIVES: Calcification of the torus tubarius has been rarely reported in the literature. Histopathologic studies have previously described cases of Eustachian tube calcification and cite an association with increasing patient age. The purpose of this study was to examine the prevalence of torus tubarius calcification and potential clinical significance on an unrestricted patient population using thin-section computed tomography (CT), which has not been previously reported. METHODS: After the institutional review board approval, 1571 consecutive patients who underwent noncontrast head CT between January 2011 and July 2011 were retrospectively reviewed for torus tubarius calcification...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28447632/a-universal-model-for-solar-eruptions
#12
Peter F Wyper, Spiro K Antiochos, C Richard DeVore
Magnetically driven eruptions on the Sun, from stellar-scale coronal mass ejections to small-scale coronal X-ray and extreme-ultraviolet jets, have frequently been observed to involve the ejection of the highly stressed magnetic flux of a filament. Theoretically, these two phenomena have been thought to arise through very different mechanisms: coronal mass ejections from an ideal (non-dissipative) process, whereby the energy release does not require a change in the magnetic topology, as in the kink or torus instability; and coronal jets from a resistive process involving magnetic reconnection...
April 26, 2017: Nature
https://www.readbyqxmd.com/read/28435207/simultaneous-feedback-control-of-plasma-rotation-and-stored-energy-on-nstx-u-using-neoclassical-toroidal-viscosity-and-neutral-beam-injection
#13
I R Goumiri, C W Rowley, S A Sabbagh, D A Gates, M D Boyer, S P Gerhardt, E Kolemen, J E Menard
A model-based feedback system is presented enabling the simultaneous control of the stored energy through βn and the toroidal rotation profile of the plasma in National Spherical Torus eXperiment Upgrade device. Actuation is obtained using the momentum from six injected neutral beams and the neoclassical toroidal viscosity generated by applying three-dimensional magnetic fields. Based on a model of the momentum diffusion and torque balance, a feedback controller is designed and tested in closed-loop simulations using TRANSP, a time dependent transport analysis code, in predictive mode...
May 2017: Physics of Plasmas
https://www.readbyqxmd.com/read/28424606/bifurcation-analysis-on-phase-amplitude-cross-frequency-coupling-in-neural-networks-with-dynamic-synapses
#14
Takumi Sase, Yuichi Katori, Motomasa Komuro, Kazuyuki Aihara
We investigate a discrete-time network model composed of excitatory and inhibitory neurons and dynamic synapses with the aim at revealing dynamical properties behind oscillatory phenomena possibly related to brain functions. We use a stochastic neural network model to derive the corresponding macroscopic mean field dynamics, and subsequently analyze the dynamical properties of the network. In addition to slow and fast oscillations arising from excitatory and inhibitory networks, respectively, we show that the interaction between these two networks generates phase-amplitude cross-frequency coupling (CFC), in which multiple different frequency components coexist and the amplitude of the fast oscillation is modulated by the phase of the slow oscillation...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28415297/toroidal-droplet-instabilities-in-the-presence-of-charge
#15
Alexandros A Fragkopoulos, Alberto Fernández-Nieves
Neutral toroidal droplets can break via the surface-tension-driven Rayleigh-Plateau instability. They can additionally exhibit a shrinking instability, which is also driven by surface tension, whereby the handle progressively disappears. We find that charging a toroidal droplet can qualitatively change the behavior and cause the droplet to expand. We successfully model the transition from shrinking to expanding, considering the pressure balance across the interface of the torus. However, despite the change in behavior, charged toroidal droplets end up breaking into spherical droplets...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28397968/trajectory-optimization-in-radiotherapy-using-sectioning-torus
#16
Christopher Barry Locke, Karl Kenneth Bush
PURPOSE: A challenging problem in trajectory optimization for radiotherapy is properly handling the synchronization of the medical accelerators dynamic delivery. The initial coarse sampling of control points implemented in a Progressive Resolution Optimization type approach (VMAT) routinely results in MLC aperture forming contention issues as the sampling resolution increases. This work presents an approach to optimize continuous, beam-on radiation trajectories through exploration of the anatomical topology present in the patient and formation of a novel dual-metric graph optimization problem...
April 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28394037/-cu6-nguas-6-2-and-its-oxidized-and-reduced-derivatives-confining-electrons-on-a-torus
#17
Matthias Witte, Martin Rohrmüller, Uwe Gerstmann, Gerald Henkel, Wolf Gero Schmidt, Sonja Herres-Pawlis
The hexanuclear thioguanidine mixed-valent copper complex cation [Cu6 (NGuaS)6 ](+2) (NGuaS = o-SC6 H4 NC(NMe2 )2 ) and its oxidized/reduced states are theoretically analyzed by means of density functional theory (DFT) (TPSSh + D3BJ/def2-TZV (p)). A detailed bonding analysis using overlap populations is performed. We find that a delocalized Cu-based ring orbital serves as an acceptor for donated S p electrons. The formed fully delocalized orbitals give rise to a confined electron cloud within the Cu6 S6 cage which becomes larger on reduction...
April 10, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28367117/representation-of-glossy-material-surface-in-ventral-superior-temporal-sulcal-area-of-common-marmosets
#18
Naohisa Miyakawa, Taku Banno, Hiroshi Abe, Toshiki Tani, Wataru Suzuki, Noritaka Ichinohe
The common marmoset (Callithrix jacchus) is one of the smallest species of primates, with high visual recognition abilities that allow them to judge the identity and quality of food and objects in their environment. To address the cortical processing of visual information related to material surface features in marmosets, we presented a set of stimuli that have identical three-dimensional shapes (bone, torus or amorphous) but different material appearances (ceramic, glass, fur, leather, metal, stone, wood, or matte) to anesthetized marmoset, and recorded multiunit activities from an area ventral to the superior temporal sulcus (STS) using multi-shanked, and depth resolved multi-electrode array...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28361174/eustachian-tuboplasty-and%C3%A2-shrinkage-of-ostial-mucosa-with-new-devices-including-a-proposal-of-a-classification%C3%A2-system
#19
L Di Rienzo Businco, A Di Mario, M Tombolini, A Mattei, M Lauriello
OBJECTIVE: A new combined approach to Eustachian tube dysfunction (ETD) employing new minimally invasive devices is described. STUDY DESIGN: An anatomoclinical classification of ETD was conceived to allow correct categorization of patients and enable comparative studies to be performed. Herein, the authors report on their experience with a consecutive series of obstructive ETD patients treated by balloon dilation of the Eustachian tube using AERA (Acclarent, Menlo Park, CA, USA), combined with a quantic molecular resonance (QMR)-mediated rhinopharyngeal tubal ostial mucosa shrinkage technique with a dedicated "Mitto" hand piece (Telea, Sandrigo-Vicenza, Italy)...
March 30, 2017: HNO
https://www.readbyqxmd.com/read/28324056/gabaergic-neurons-and-their-modulatory-effects-on-gnrh3-in-zebrafish
#20
Yanlong Song, Binbin Tao, Ji Chen, Shaoting Jia, Zuoyan Zhu, Vance L Trudeau, Wei Hu
γ-Aminobutyric acid (GABA) is a major amino acid neurotransmitter in the vertebrate brain. To provide detailed information on the distribution of the GABA in zebrafish (Danio rerio), neurons were labeled with mCherry driven by the glutamic acid decarboxylase 67 (gad67) promoter. In the transgenic line Tg(gad67:mCherry), mCherry-positive gad67 cell bodies were predominantly localized to the olfactory bulb, pallial zones, subpallium zones, parvocellular preoptic nucleus, periventricular gray zone of optic tectum, torus semicircularis, posterior tuberculum, medial longitudinal fascicle, caudal zone of periventricular hypothalamus, and oculomotor nucleus...
April 1, 2017: Endocrinology
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