Thoracic impedance change equation deduced on the basis of parallel impedance model and Ohm's law
Xiao Qiu-Jin, Wang Zhen, Kuang Ming-Xing, Wen Ping, Liu Pei et al.
Influence of a transverse static magnetic field on the magnetic hyperthermia properties and high-frequency hysteresis loops of ferromagnetic FeCo nanoparticles
B. Mehdaoui, J. Carrey, M. Stadler, A. Cornejo, C. Nayral et al.
The influence of a transverse static magnetic field on the magnetic hyperthermia properties is studied on a system of large-losses ferromagnetic FeCo nanoparticles. The simultaneous measurement of the high-frequency hysteresis loops and of the temperature rise provides an interesting insight into th ... [Appl. Phys. Lett. 100, 052403 (2012)] published Wed Feb 1, 2012.
Erratum: Riemannian geometric approach to human arm dynamics, movement optimization, and invariance [Phys. Rev. E 83, 031927 (2011)]
Armin Biess, Tamar Flash, and Dario G. Liebermann
Abstract not available. [Phys. Rev. E 85, 019907 ] published .
Foot Placement and Balance in 3D
Matthew Millard, John McPhee, and Eric Kubica
Humans use carefully chosen step locations to restore their balance during locomotion and in response to perturbations. Understanding the relationship between foot placement and balance restoration is key to developing useful dynamic human balance diagnostic tests and balance rehabilitation treatmen ... [J. Comput. Nonlinear Dynam. 7, 021015 (2012)] published Thu Jan 26, 2012.
Margination of White Blood Cells in Microcapillary Flow
Dmitry A. Fedosov, Julia Fornleitner, and Gerhard Gompper
Margination of white blood cells (WBCs) towards vessel walls is an essential precondition for their efficient adhesion to the vascular endothelium. We perform numerical simulations with a two-dimensional blood flow model to investigate the dependence of WBC margination on hydrodynamic interactions o ... [Phys. Rev. Lett. 108, 028104 ] published .
How Changes in Cell Mechanical Properties Induce Cancerous Behavior
Parag Katira, Muhammad H. Zaman, and Roger T. Bonnecaze
Tumor growth and metastasis are ultimately mechanical processes involving cell migration and uncontrolled division. Using a 3D discrete model of cells, we show that increased compliance as observed for cancer cells causes them to grow at a much faster rate compared to surrounding healthy cells. We a ... [Phys. Rev. Lett. 108, 028103 ] published .
Statistical physics approach to dendritic computation: The excitable-wave mean-field approximation
Leonardo L. Gollo, Osame Kinouchi, and Mauro Copelli
We analytically study the input-output properties of a neuron whose active dendritic tree, modeled as a Cayley tree of excitable elements, is subjected to Poisson stimulus. Both single-site and two-site mean-field approximations incorrectly predict a nonequilibrium phase transition which is not allo ... [Phys. Rev. E 85, 011911 ] published .
Corticothalamic dynamics: Structure of parameter space, spectra, instabilities, and reduced model
J. A. Roberts and P. A. Robinson
Linear instabilities are analyzed in a physiologically based mean-field corticothalamic model and a reduced-parameter model derived from it. In both models, the stable zone corresponding to normal arousal states is bounded by a series of surfaces demarcating the onsets of instabilities. The stable z ... [Phys. Rev. E 85, 011910 ] published .
Propagating unstable wavelets in cardiac tissue
Patrick M. Boyle, Adarsh Madhavan, Matthew P. Reid, and Edward J. Vigmond
Solitonlike propagating modes have been proposed for excitable tissue, but have never been measured in cardiac tissue. In this study, we simulate an experimental protocol to elicit these propagating unstable wavelets (PUWs) in a detailed three-dimensional ventricular wedge preparation. PUWs appear a ... [Phys. Rev. E 85, 011909 ] published .
Numerical Prediction of Heat Transfer Patterns in a Subject-Specific Human Upper Airway
Prihambodo H. Saksono, Perumal Nithiarasu, and Igor Sazonov
In this paper, the flow and heat transfer patterns in a subject-specific geometry of the human upper airway is numerically studied. The study was conducted for steady, inspiratory flow associated with quiet normal breathing with a tidal volume of V = 0.5 L/min and flow rate of Q = 250 cm/s. The nume ... [J. Heat Transfer 134, 031022 (2012)] published Fri Jan 20, 2012.
Fractal variability: An emergent property of complex dissipative systems
Andrew J. E. Seely and Peter Macklem
The patterns of variation of physiologic parameters, such as heart and respiratory rate, and their alteration with age and illness have long been under investigation; however, the origin and significance of scale-invariant fractal temporal structures that characterize healthy biologic variability re ... [Chaos 22, 013108 (2012)] published Thu Jan 19, 2012.
Comprehensive validation of computational fluid dynamics simulations of in-vivo blood flow in patient-specific cerebral aneurysms
Qi Sun, Alexandra Groth, and Til Aach
Synaptic Bistability Due to Nucleation and Evaporation of Receptor Clusters
V. M. Burlakov, N. Emptage, A. Goriely, and P. C. Bressloff
We introduce a bistability mechanism for long-term synaptic plasticity based on switching between two metastable states that contain significantly different numbers of synaptic receptors. One state is characterized by a two-dimensional gas of mobile interacting receptors and is stabilized against cl ... [Phys. Rev. Lett. 108, 028101 ] published .
Synchronization analysis of voltage-sensitive dye imaging during focal seizures in the rat neocortex
Daisuke Takeshita and Sonya Bahar
Seizures are often assumed to result from an excess of synchronized neural activity. However, various recent studies have suggested that this is not necessarily the case. We investigate synchronization during focal neocortical seizures induced by injection of 4-aminopyridine (4AP) in the rat neocort ... [Chaos 21, 047506 (2011)] published Thu Dec 29, 2011.
Vulnerability to paroxysmal oscillations in delayed neural networks: A basis for nocturnal frontal lobe epilepsy?
Austin Quan, Ivan Osorio, Toru Ohira, and John Milton
Resonance can occur in bistable dynamical systems due to the interplay between noise and delay (tau) in the absence of a periodic input. We investigate resonance in a two-neuron model with mutual time-delayed inhibitory feedback. For appropriate choices of the parameters and inputs three fixed-point ... [Chaos 21, 047512 (2011)] published Thu Dec 29, 2011.
Coherence depression in stochastic excitable systems with two-frequency forcing
Na Yu and Andre Longtin
We study the response of two generic neuron models, the leaky integrate-and-fire (LIF) model and the leaky integrate-and-fire model with dynamic threshold (LIFDT) (i.e., with memory) to a stimulus consisting of two sinusoidal drives with incommensurate frequency, an amplitude modulation (envelope) n ... [Chaos 21, 047507 (2011)] published Thu Dec 29, 2011.
Nonlinear dynamics of skin potentials in the electrosensory paddlefish
Michael H. Hofmann and Lon A. Wilkens
It is known that steady skin potentials are present in fishes due to chloride pumps in the gills and in the skin. We have found previously that these skin potentials can fluctuate and oscillate in the electrosensory paddlefish. Here we show that larger, discharge like potentials can be triggered by ... [Chaos 21, 047504 (2011)] published Thu Dec 29, 2011.
Variability of spatio-temporal patterns in non-homogeneous rings of spiking neurons
Serhiy Yanchuk, Przemyslaw Perlikowski, Oleksandr V. Popovych, and Peter A. Tass
We show that a ring of unidirectionally delay-coupled spiking neurons may possess a multitude of stable spiking patterns and provide a constructive algorithm for generating a desired spiking pattern. More specifically, for a given time-periodic pattern, in which each neuron fires once within the pat ... [Chaos 21, 047511 (2011)] published Thu Dec 29, 2011.
Noise-induced precursors of tonic-to-bursting transitions in hypothalamic neurons and in a conductance-based model
Hans A. Braun, Justus Schwabedal, Mathias Dewald, Christian Finke, Svetlana Postnova et al.
The dynamics of neurons is characterized by a variety of different spiking patterns in response to external stimuli. One of the most important transitions in neuronal response patterns is the transition from tonic firing to burst discharges, i.e., when the neuronal activity changes from single spike ... [Chaos 21, 047509 (2011)] published Thu Dec 29, 2011.
Sequential Structural and Fluid Dynamic Numerical Simulations of a Stented Bifurcated Coronary Artery
Stefano Morlacchi, Claudio Chiastra, Dario Gastaldi, Giancarlo Pennati, Gabriele Dubini et al.
Despite their success, stenting procedures are still associated to some clinical problems like sub-acute thrombosis and in-stent restenosis. Several clinical studies associate these phenomena to a combination of both structural and hemodynamic alterations caused by stent implantation. Recently, nume ... [J. Biomech. Eng. 133, 121010 (2011)] published Thu Dec 29, 2011.
Numerical prediction of frequency dependent 3D maps of mechanical index thresholds in ultrasonic brain therapy
Gianmarco Pinton, Jean-Francois Aubry, Mathias Fink, and Mickael Tanter