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This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 22.

National training scheme for the use of radioiodine in benign thyroid disease
The next RCP national training scheme for the use of radioiodine in benign thyroid disease will take place on Tuesday 12 November 2013 at Birmingham Research Park, Birmingham, B15 2SQ. This one day course represents an essential component of the new national training scheme aiming to allow application for ARSAC certification for iodine-131 administration for the treatment of benign thyroid disease. The other components of training, upon which guidance will be given and log books provided, will be locally arranged and mentored experience of clinical cases, as well as medical physics experience. This training programme will ...
Source: Society for Endocrinology - February 15, 2013 Category: Endocrinology Source Type: news

Permeability of gloves used in nuclear medicine departments to [(99m)Tc]-pertechnetate and [(18)F]-fluorodeoxyglucose: Radiation protection considerations.
Abstract In order to evaluate the safety of the individual protection devices, the permeability of four different types of disposable gloves, commonly used in hospitals, was tested in relation to [(99m)Tc]-pertechnetate and to [(18)F]-fluorodeoxyglucose ([(18)F]-FDG). From these radiopharmaceutical solutions, a drop was deposited on the external surface of the glove which was opened and stretched with the external surface placed upward. The smear test technique permitted to evaluate the activity onto the inner surface of the glove at different times. The smear tests were measured in a well sodium iodide detector ca...
Source: Physica Medica - February 15, 2013 Category: Physics Authors: Ridone S, Matheoud R, Valzano S, Di Martino R, Vigna L, Brambilla M Tags: Phys Med Source Type: research

Occupational cosmic radiation exposure in Portuguese airline pilots: study of a possible correlation with oxidative biological markers.
Abstract Several studies have sought to understand the health effects of occupational exposure to cosmic radiation. However, only few biologic markers or associations with disease outcomes have so far been identified. In the present study, 22 long- and 26 medium-haul male Portuguese airline pilots and 36 factory workers who did not fly regularly were investigated. The two groups were comparable in age and diet, were non-smokers, never treated with ionizing radiation and other factors. Cosmic radiation exposure in pilots was quantified based on direct monitoring of 51 flights within Europe, and from Europe to North ...
Source: Radiation and Environmental Biophysics - February 15, 2013 Category: Physics Authors: Silva R, Folgosa F, Soares P, Pereira AS, Garcia R, Gestal-Otero JJ, Tavares P, Gomes da Silva MD Tags: Radiat Environ Biophys Source Type: research

Visible and near-infrared planar waveguide structure of polycrystalline zinc sulfide from C ions implantation
We report the fabrication of a planar waveguide in polycrystalline zinc sulfide by 6.0 MeV C ions implantation with a fluence of 5 × 10^14 ion/cm^2 at room temperature. The near-field light intensity profiles in the visible and near-infrared bands are measured by the end-face coupling method ...
Source: Optics Express - February 15, 2013 Category: Physics Authors: Tao LiuPeng LiuLian ZhangYu-Fan ZhouXiao-Fei YuJin-Hua ZhaoXue-Lin Wang Source Type: research

Enhanced stability of nitrogen-sealed carbon nanotube saturable absorbers under high-intensity irradiation
Due to their broadband saturable absorption and fast response, carbon nanotubes have proven to be an excellent material for the modelocking of fiber lasers and have become a promising device for the implementation of novel laser configurations. However, it is imperative to address the issue of ...
Source: Optics Express - February 15, 2013 Category: Physics Authors: Amos MartinezKazuyuki FuseShinji Yamashita Source Type: research

Thermo-optomechanical oscillator for sensing applications
We demonstrate and characterize a thermo-optomechanical oscillator based on a PMMA-coated silica microtoroid and employ it as a sensor. The observed thermo-optomechanical oscillation has a unique waveform that consists of fast and slow oscillation periods. A model based on thermal and optical ...
Source: Optics Express - February 15, 2013 Category: Physics Authors: Yang DengFenfei LiuZayd C. LesemanMani Hossein-Zadeh Source Type: research

Laser heterodyne interferometric signal processing method based on rising edge locking with high frequency clock signal
A novel phase measurement method composed of the rising-edge locked signal processing and the digital frequency mixing is proposed for laser heterodyne interferometer. The rising-edge locked signal processing, which employs a high frequency clock signal to lock the rising-edges of the reference and ...
Source: Optics Express - February 15, 2013 Category: Physics Authors: Enzheng ZhangBenyong ChenLiping YanTao YangQun HaoWenjun DongChaorong Li Source Type: research

Nano-machines for 'bionic proteins'
(University of Vienna) Physicists of the University of Vienna together with researchers from the University of Natural Resources and Life Sciences Vienna developed nano-machines which recreate principal activities of proteins. They present the first versatile and modular example of a fully artificial protein-mimetic model system, thanks to the Vienna Scientific Cluster, a high performance computing infrastructure. These "bionic proteins" could play an important role in innovating pharmaceutical research. The results have now been published in the renowned journal Physical Review Letters.
Source: EurekAlert! - Biology - February 15, 2013 Category: Biology Source Type: news

REFLECTIONS: Practicing Biochemistry without a License [Protein Structure and Folding]
Prelude I grew up in a New Jersey suburb twenty miles east of Manhattan. My passion for science began early in grade school, prompted in part by my father's training in chemical engineering and his work at Union Carbide Corporation during the development of the plastics industry. My first chemistry set and home laboratory were followed by a series of summer jobs in industrial laboratories. My fondest memory was making a ball-and-stick model of the most complicated organic molecule I could find in my chemistry textbook and showing it to my father. He instantly identified it as sulfanilamide. From that moment on, I knew I wa...
Source: Journal of Biological Chemistry - February 15, 2013 Category: Chemistry Authors: Bunn, H. F. Tags: Reflections Source Type: research

A polychromator-type near-infrared spectrometer with a high-sensitivity and high-resolution photodiode array detector for pharmaceutical process monitoring on the millisecond time scale
Kodai Murayama, Takuma Genkawa, Daitaro Ishikawa, Makoto Komiyama, and Yukihiro Ozaki In the fine chemicals industry, particularly in the pharmaceutical industry, advanced sensing technologies have recently begun being incorporated into the process line in order to improve safety and quality in accordance with process analytical technology. For estimating the quality of powders witho ... [Rev. Sci. Instrum. 84, 023104 (2013)] published Wed Feb 13, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

Practical guide for validated memristance measurements
Nan Du, Yao Shuai, Wenbo Luo, Christian Mayr, Rene Schuffny et al. Chua [IEEE Trans. Circuit Theory 18, 507519 (1971)] predicted rather simple charge-flux curves for active and passive memristors (short for memory resistors) and presented active memristor circuit realizations already in the 1970 s. The first passive memristor has been presented in 2008 [D. B. Struk ... [Rev. Sci. Instrum. 84, 023903 (2013)] published Wed Feb 13, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

Photothermal model fitting in the complex plane for thermal properties determination in solids
M. A. Zambrano-Arjona, F. Penunuri, M. Acosta, I. Riech, R. A. Medina-Esquivel et al. Thermal properties of solids are obtained by fitting the exact complex photothermal model to the normalized photoacoustic (PA) signal in the front configuration. Simple closed-form expressions for the amplitude and phase are presented in all frequency ranges. In photoacoustic it has been common prac ... [Rev. Sci. Instrum. 84, 024903 (2013)] published Wed Feb 13, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

Evaluation of the sensitivity limits of water vapor transmission rate measurements using electrical calcium test
Michael D. Kempe, Matthew O. Reese, and Arrelaine A. Dameron The development of flexible organic light emitting diode displays and flexible thin film photovoltaic devices is dependent on the use of flexible, low-cost, optically transparent and durable barriers to moisture and/or oxygen. It is estimated that this will require high barriers with water vapor tra ... [Rev. Sci. Instrum. 84, 025109 (2013)] published Wed Feb 13, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

Cascaded two-photon spectroscopy of Yb atoms with a transportable effusive atomic beam apparatus
We present a transportable effusive atomic beam apparatus for cascaded two-photon spectroscopy of the dipole-forbidden transition (6s S 6s7s S) of Yb atoms. An ohmic-heating effusive oven is designed to have a reservoir volume of 1.6 cm and a high degree of atomic beam collimation angle of 30 mr ... [Rev. Sci. Instrum. 84, 023105 (2013)] published Thu Feb 14, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

Translational diffusion of probe molecules under high pressure: A study by fluorescence recovery after photobleaching technique
We present fluorescence recovery measurements after photobleaching performed under high pressure in liquids that fill square-section fused silica micro-capillaries. These micro-capillaries withstand pressure up to 2500 bar for a wall thickness of about 140 [mu]m and fit easily on the microscope stag ... [Rev. Sci. Instrum. 84, 023904 (2013)] published Thu Feb 14, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

Variable-temperature device for precision Casimir-force-gradient measurement
We present the design and use of an instrument that is based on a microcantilever to perform precision force gradient measurements. We demonstrate its performance through measurements of the Casimir pressure at various temperatures. The instrument can operate in high vacuum environments and temperat ... [Rev. Sci. Instrum. 84, 025110 (2013)] published Thu Feb 14, 2013.
Source: Review of Scientific Instruments - February 14, 2013 Category: Physics Source Type: research

On Lyapunov boundary control of unstable magnetohydrodynamic plasmas
H. Tasso and G. N. Throumoulopoulos Starting from a simple, marginally stable model considered for Lyapunov based boundary control of flexible mechanical systems, we add a term driving an instability and prove that for an appropriate control condition the system can become Lyapunov stable. A similar approximate extension is found for ... [Phys. Plasmas 20, 024505 (2013)] published Wed Feb 13, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

The Hamiltonian structure and Euler-Poincare formulation of the Vlasov-Maxwell and gyrokinetic systems
We present a new variational principle for the gyrokinetic system, similar to the Maxwell-Vlasov action presented in H. Cendra et al., [J. Math. Phys. 39, 3138 (1998)]. The variational principle is in the Eulerian frame and based on constrained variations of the phase space fluid velocity and partic ... [Phys. Plasmas 20, 022501 (2013)] published Wed Feb 13, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Strong nonlinear electron multiplication without impact ionization in dielectric nanoparticles embedded in optical materials
Guillaume Duchateau The interaction of a dielectric nano-particle or nano-defect, embedded in the bulk of an optical material, with an intense and short laser pulse is addressed. Due to the finite size of the target and the possible large production of electrons in the conduction band, large electric field enhancement ... [Phys. Plasmas 20, 022306 (2013)] published Wed Feb 13, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

On the toroidal plasma rotations induced by lower hybrid waves
Xiaoyin Guan, Hong Qin, Jian Liu, and Nathaniel J. Fisch A theoretical model is developed to explain the plasma rotations induced by lower hybrid waves in Alcator C-Mod. In this model, torodial rotations are driven by the Lorentz force on the bulk-electron flow across flux surfaces, which is a response of the plasma to the resonant-electron flow across fl ... [Phys. Plasmas 20, 022502 (2013)] published Wed Feb 13, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Experimental observation of the behaviour of cogenerated dusty plasma using a bipolar pulsed direct current power supply
Sanjib Sarkar, M. Bose, J. Pramanik, and S. Mukherjee We have experimentally observed the behaviour of cogenerated dusts in unmagnetized plasma produced using a bipolar pulsed dc power supply. In this experiment, the dust particles have been generated through sputtering of graphite cathode and were stratified between two electrodes. This stratification ... [Phys. Plasmas 20, 024506 (2013)] published Wed Feb 13, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Propagation and dispersion of whistler waves generated by fast reconnection onset
Nagendra Singh The role of whistler mode during the onset of magnetic reconnection (MR) has been widely suggested, but the manifestations of its highly dispersive and anisotropic propagation properties in reconnection events remain largely unclear. Comparing results from a recently developed theoretical model for ... [Phys. Plasmas 20, 022106 (2013)] published Wed Feb 13, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Shukla-Nambu-Salimullah potential with multi electron species in magnetoplasmas
Arroj A. Khan, M. Jamil, A. Rasheed, and G. Murtaza The phenomenon of shielding of test charge in the presence of an external magnetic field (Shukla-Nambu-Salimullah potential) is investigated in electron ion plasmas using the approach of two temperature electrons. The modified dispersion relations of ion acoustic waves under different conditions are ... [Phys. Plasmas 20, 022107 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Development of an identification method of pressure anisotropy based on equilibrium analysis and magnetics
Y. Asahi, Y. Suzuki, K. Y. Watanabe, and W. A. Cooper We evaluate the fluxes measured by the magnetic flux loops installed in LHD by using a three dimensional MHD equilibrium analysis code, ANIMEC, which enable us to directly determine the calibration function between the anisotropic pressure and the measured fluxes for the non-axisymmetric plasmas for ... [Phys. Plasmas 20, 022503 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Global current profile effects on the evolution and saturation of magnetic islands
A. Poye, O. Agullo, A. Smolyakov, S. Benkadda, and X. Garbet The nonlinear evolution of magnetic islands is investigated by means of numerical simulations. The growth and saturation of the island are shown to depend not only on asymptotic tearing mode stability parameter Delta but also on the initial global current profile. Presence of the external current sh ... [Phys. Plasmas 20, 020702 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Lower hybrid instability driven by mono-energy alpha-particles with finite pitch angle spread in a plasma
Pawan Kumar, Vishvesh Singh, and V. K. Tripathi A kinetic formalism of lower hybrid wave instability, driven by mono-energy alpha-particles with finite pitch angle spread, is developed. The instability arises through cyclotron resonance interaction with high cyclotron harmonics of alpha-particles. The alpha-particles produced in D-T fusion reacti ... [Phys. Plasmas 20, 022504 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Renormalized dynamic charge shielding on the electron-atom collision: Eikonal analysis
Young-Dae Jung and Woo-Pyo Hong The influence of the dynamic renormalization plasma shielding on the electron-atom collision is investigated in a dense strongly coupled electron system. The semiclassical eikonal method and effective interaction potential are employed to obtain the eikonal scattering phase shift and eikonal collisi ... [Phys. Plasmas 20, 022109 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Effective charge and effective radius of water droplet in dropwise cluster
A. V. Shavlov, S. N. Romanyuk, and V. A. Dzhumandzhi A particle with large electric charge Z (Z >> 1) and radius R inserted into plasma is surrounded by a plasma shell, which is stable to weak and short-term external exposures. As a result, during experiments the particle can reveal an effective charge Z* lower than the true one (Z*
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Aspects of linear Landau damping in discretized systems
Vasil Bratanov, Frank Jenko, David Hatch, and Stephan Brunner Basic linear eigenmode spectra for electrostatic Langmuir waves and drift-kinetic slab ion temperature gradient modes are examined in a series of scenarios. Collisions are modeled via a Lenard-Bernstein collision operator which fundamentally alters the linear spectrum even for infinitesimal collisio ... [Phys. Plasmas 20, 022108 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

The interaction of polarized microwaves with planar arrays of femtosecond laser-produced plasma filaments in air
Anca Marian, Mbark El Morsli, Francois Vidal, Stephane Payeur, Marc Chateauneuf et al. The interaction of polarized microwaves with subwavelength arrays of parallel plasma filaments, such as those produced by the propagation of high-power femtosecond laser pulses in ambient air, was investigated by calculating the reflection and transmission coefficients as a function of the incidence ... [Phys. Plasmas 20, 023301 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Generating vorticity and magnetic fields in plasmas in general relativity: Spacetime curvature drive
Felipe A. Asenjo, Swadesh M. Mahajan, and Asghar Qadir Using the generally covariant magnetofluid formalism for a hot plasma, a spacetime curvature driven mechanism for generating seed vorticity/magnetic field is presented. The battery owes its origin to the interaction between the gravity modified Lorentz factor of the fluid element and the inhomogeneo ... [Phys. Plasmas 20, 022901 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Acceleration and dynamics of an electron in the degenerate and magnetized plasma elliptical waveguide
A. Abdoli-Arani, B. Jazi, and B. Shokri The dynamics and energy gain of an electron in the field of a transverse magnetic wave propagating inside an elliptical degenerate plasma waveguide is analytically investigated by finding the field components of the TM mode in this waveguide. Besides, by solving the relativistic momentum and energy ... [Phys. Plasmas 20, 023104 (2013)] published Thu Feb 14, 2013.
Source: Physics of Plasmas - February 14, 2013 Category: Physics Source Type: research

Formulation for volume flowrate induced by vortex rings, through circular orifice of arbitrary section profile
Chi-Hoon Cho and Duck-Joo Lee A new theoretical formulation that relates the volume flowrate to the vorticity distribution for the circular orifice of an arbitrary section profile is presented. The formulation is based on axisymmetric potential theory involving Green's function of Stokes' streamfunction. The results showed that ... [Phys. Fluids 25, 021702 (2013)] published Wed Feb 13, 2013.
Source: Physics of Fluids - February 14, 2013 Category: Physics Source Type: research

Deformation of vortex patches by boundaries
A. Crosby, E. R. Johnson, and P. J. Morrison The deformation of two-dimensional vortex patches in the vicinity of fluid boundaries is investigated. The presence of a boundary causes an initially circular patch of uniform vorticity to deform. Sufficiently far away from the boundary, the deformed shape is well approximated by an ellipse. This le ... [Phys. Fluids 25, 023602 (2013)] published Wed Feb 13, 2013.
Source: Physics of Fluids - February 14, 2013 Category: Physics Source Type: research

Frequency dependence and frequency control of microbubble streaming flows
Cheng Wang, Bhargav Rallabandi, and Sascha Hilgenfeldt Steady streaming from oscillating microbubbles is a powerful actuating mechanism in microfluidics, enjoying increased use due to its simplicity of manufacture, ease of integration, low heat generation, and unprecedented control over the flow field and particle transport. As the streaming flow patter ... [Phys. Fluids 25, 022002 (2013)] published Wed Feb 13, 2013.
Source: Physics of Fluids - February 14, 2013 Category: Physics Source Type: research

Spectral action for a one-parameter family of Dirac operators on SU(2) and SU(3)
Alan Lai and Kevin Teh The one-parameter family of Dirac operators containing the Levi-Civita, cubic, and the trivial Dirac operators on a compact Lie group is analyzed. The spectra for the one-parameter family of Dirac Laplacians on SU(2) and SU(3) are computed by considering a diagonally embedded Casimir operator. Then ... [J. Math. Phys. 54, 022302 (2013)] published Wed Feb 13, 2013.
Source: Journal of Mathematical Physics - February 14, 2013 Category: Physics Source Type: research

A fully covariant information-theoretic ultraviolet cutoff for scalar fields in expanding Friedmann Robertson Walker spacetimes
A. Kempf, A. Chatwin-Davies, and R. T. W. Martin While a natural ultraviolet cutoff, presumably at the Planck length, is widely assumed to exist in nature, it is nontrivial to implement a minimum length scale covariantly. This is because the presence of a fixed minimum length needs to be reconciled with the ability of Lorentz transformations to co ... [J. Math. Phys. 54, 022301 (2013)] published Wed Feb 13, 2013.
Source: Journal of Mathematical Physics - February 14, 2013 Category: Physics Source Type: research

A macroscopic model of proton transport through the membrane-ionomer interface of a polymer electrolyte membrane fuel cell
Milan Kumar, Brian J. Edwards, and Stephen J. Paddison The membrane-ionomer interface is the critical interlink of the electrodes and catalyst to the polymer electrolyte membrane (PEM); together forming the membrane electrode assembly in current state-of-the-art PEM fuel cells. In this paper, proton conduction through the interface is investigated to un ... [J. Chem. Phys. 138, 064903 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

A multireference perturbation study of the NN stretching frequency of trans-azobenzene in npi* excitation and an implication for the photoisomerization mechanism
Yu Harabuchi, Moe Ishii, Akira Nakayama, Takeshi Noro, and Tetsuya Taketsugu A multireference second-order perturbation theory is applied to calculate equilibrium structures and vibrational frequencies of trans-azobenzene in the ground and npi excited states, as well as the reaction pathways for rotation and inversion mechanism in the npi excited state. It is found that the ... [J. Chem. Phys. 138, 064305 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Percolation transition of short-ranged square well fluids in bulk and confinement
Helge Neitsch and Sabine H. L. Klapp Using grand canonical Monte Carlo simulations, we investigate the percolation behavior of a square-well fluid with an ultra-short range of attraction in three dimension (3D) and in confined geometry. The latter is defined through two parallel and structureless walls (slit-pore). We focus on temperat ... [J. Chem. Phys. 138, 064904 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

An efficient method for calculating dynamical hyperpolarizabilities using real-time time-dependent density functional theory
Feizhi Ding, Benjamin E. Van Kuiken, Bruce E. Eichinger, and Xiaosong Li In this paper we present a time-domain time-dependent density functional theory (TDDFT) approach to calculate frequency-dependent polarizability and hyperpolarizabilities. In this approach, the electronic degrees of freedom are propagated within the density matrix based TDDFT framework using the eff ... [J. Chem. Phys. 138, 064104 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Gaussian-based multiconfiguration time-dependent Hartree: A two-layer approach. I. Theory
We describe a novel two-layer variant of the Gaussian-based multiconfiguration time-dependent Hartree (G-MCTDH) approach which improves on the performance and convergence properties of quantum propagation based on variationally evolving frozen Gaussians (FGs). While the standard scheme uses factoriz ... [J. Chem. Phys. 138, 064106 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Communication: X-ray excited optical luminescence from TbCl at the giant resonance of terbium
F. Heigl, A. Jurgensen, X.-T. Zhou, Y.-F. Hu, L. Zuin et al. We have studied the optical recombination channels of TbCl using x-ray excited optical luminescence at the N absorption edge of Tb (giant resonance) in both the energy and time domain. The luminescence exhibits a relatively fast D, and a slow D decay channel in the blue and green, respectively. The ... [J. Chem. Phys. 138, 061104 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Computational analysis of the quadrupole contribution in the second-harmonic generation spectroscopy for the water/vapor interface
Shiratori Kazuya (白鳥和矢), Shoichi Yamaguchi (山口祥一), Tahei Tahara (田原太平), and Akihiro Morita (森田明弘) Second-order susceptibility for water/vapor interface is calculated theoretically using molecular dynamics simulation, which considers both the dipole and quadrupole contributions. We find that the nonresonant second harmonic generation (SHG) signal is dominated by the quadrupole contribution from t ... [J. Chem. Phys. 138, 064704 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

On the origin of bistability in the Stage 2 of the Huang-Ferrell model of the MAPK signaling
O. HadaC, I. Schreiber, and M. Pribyl Mitogen-activated protein kinases (MAPKs) are important signal transducing enzymes, unique to eukaryotes, that are involved in many pathways of cellular regulation. Successive phosphorylation cascades mediated by MAPKs serve as sensitive switches initiating various cellular processes. Apart from thi ... [J. Chem. Phys. 138, 065102 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Trapping of diffusing particles by clusters of absorbing disks on a reflecting wall with disk centers on sites of a square lattice
Alexander M. Berezhkovskii, Leonardo Dagdug, Marco-Vinicio Vazquez, Vladimir A. Lizunov, Joshua Zimmerberg et al. A simple approximate formula is derived for the rate constant that describes steady-state flux of diffusing particles through a cluster of perfectly absorbing disks on the otherwise reflecting flat wall, assuming that the disk centers occupy neighboring sites of a square lattice. A distinctive featu ... [J. Chem. Phys. 138, 064105 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Pore morphologies and diffusion within hydrated polyelectrolyte membranes: Homogeneous vs heterogeneous and random side chain attachment
G. Dorenbos and K. Morohoshi Using dissipative particle dynamics pore morphologies within model ionomer membranes are simulated. The ionomers are composed of hydrophobic backbones and side chains that are end-linked with a hydrophilic acid containing site. The separation distance between successive branching points is bi-modal, ... [J. Chem. Phys. 138, 064902 (2013)] published Wed Feb 13, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Importance of many-body correlations in glass transition: An example from polydisperse hard spheres
Mathieu Leocmach, John Russo, and Hajime Tanaka Most of the liquid-state theories, including glass-transition theories, are constructed on the basis of two-body density correlations. However, we have recently shown that many-body correlations, in particular, bond orientational correlations, play a key role in both the glass transition and the cry ... [J. Chem. Phys. 138, 12A536 (2013)] published Thu Feb 14, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Microscopic calculation of the free energy cost for activated transport in glass-forming liquids
Pyotr Rabochiy and Vassiliy Lubchenko Activated transport in liquidssupercooled liquids in particularoccurs via mutual nucleation of alternative, aperiodic minima of the free energy. Xia and Wolynes [Proc. Natl. Acad. Sci. U.S.A. 97, 2990 (2000)] have made a general argument that at temperatures near the ideal glass transition, the surf ... [J. Chem. Phys. 138, 12A534 (2013)] published Thu Feb 14, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research

Identification of long-lived clusters and their link to slow dynamics in a model glass former
Alex Malins, Jens Eggers, C. Patrick Royall, Stephen R. Williams, and Hajime Tanaka We study the relationship between local structural ordering and dynamical heterogeneities in a model glass-forming liquid, the Wahnstrom mixture. A novel cluster-based approach is used to detect local energy minimum polyhedral clusters and local crystalline environments. A structure-specific time co ... [J. Chem. Phys. 138, 12A535 (2013)] published Thu Feb 14, 2013.
Source: Journal of Chemical Physics - February 14, 2013 Category: Physics Source Type: research