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https://www.readbyqxmd.com/read/28534025/atrial-fibrillation-dynamics-and-ionic-block-effects-in-six-heterogeneous-human-3d-virtual-atria-with-distinct-repolarization-dynamics
#1
Carlos Sánchez, Alfonso Bueno-Orovio, Esther Pueyo, Blanca Rodríguez
Atrial fibrillation (AF) usually manifests as reentrant circuits propagating through the whole atria creating chaotic activation patterns. Little is yet known about how differences in electrophysiological and ionic properties between patients modulate reentrant patterns in AF. The goal of this study is to quantify how variability in action potential duration (APD) at different stages of repolarization determines AF dynamics and their modulation by ionic block using a set of virtual whole-atria human models...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28533523/characterization-of-two-distant-double-slits-by-chaotic-light-second-order-interference
#2
Milena D'Angelo, Aldo Mazzilli, Francesco V Pepe, Augusto Garuccio, Vincenzo Tamma
We present the experimental characterization of two distant double-slit masks illuminated by chaotic light, in the absence of first-order imaging and interference. The scheme exploits second-order interference of light propagating through two indistinguishable pairs of disjoint optical paths passing through the masks of interest. The proposed technique leads to a deeper understanding of biphoton interference and coherence, and opens the way to the development of novel schemes for retrieving information on the relative position and the spatial structure of distant objects, which is of interest in remote sensing, biomedical imaging, as well as monitoring of laser ablation, when first-order imaging and interference are not feasible...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28533331/chronic-stimulation-of-renin-cells-leads-to-vascular-pathology
#3
Masafumi Oka, Silvia Medrano, Maria Luisa S Sequeira-Lόpez, R Ariel Gómez
Experimental or spontaneous genomic mutations of the renin-angiotensin system or its pharmacological inhibition in early life leads to renal abnormalities, including poorly developed renal medulla, papillary atrophy, hydronephrosis, inability to concentrate the urine, polyuria, polydipsia, renal failure, and anemia. At the core of such complex phenotype is the presence of unique vascular abnormalities: the renal arterioles do not branch or elongate properly and they have disorganized, concentric hypertrophy...
May 22, 2017: Hypertension
https://www.readbyqxmd.com/read/28529213/effective-strategies-for-affordable-care-act-enrollment-in-immigrant-serving-safety-net-clinics-in-new-mexico
#4
Christina M Getrich, Jacqueline M García, Angélica Solares, Miria Kano
In the new Affordable Care Act (ACA) health care environment, safety-net institutions continue to serve as important sources of culturally appropriate care for different groups of immigrant patients. This article reports on a qualitative study examining the early ACA enrollment experiences of a range of health care providers (n = 29) in six immigrant-serving safety-net clinics in New Mexico. The six clinics configured their ACA enrollment strategies differently with regard to operations, staffing, and outreach...
2017: Journal of Health Care for the Poor and Underserved
https://www.readbyqxmd.com/read/28528785/resonance-tube-phonation-in-water-the-effect-of-tube-diameter-and-water-depth-on-back-pressure-and-bubble-characteristics-at-different-airflows
#5
Greta Wistbacka, Pedro Amarante Andrade, Susanna Simberg, Britta Hammarberg, Maria Södersten, Jan G Švec, Svante Granqvist
OBJECTIVES: Resonance tube phonation with tube end in water is a voice therapy method in which the patient phonates through a glass tube, keeping the free end of the tube submerged in water, creating bubbles. The purpose of this experimental study was to determine flow-pressure relationship, flow thresholds between bubble types, and bubble frequency as a function of flow and back volume. METHODS: A flow-driven vocal tract simulator was used for recording the back pressure produced by resonance tubes with inner diameters of 8 and 9 mm submerged at water depths of 0-7 cm...
May 18, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28525309/from-chaos-to-harmony-responses-and-signaling-upon-microbial-pattern-recognition
#6
Xiao Yu, Baomin Feng, Ping He, Libo Shan
Pathogen- or microbe-associated molecular patterns (PAMPs/MAMPs) are detected as nonself by host pattern recognition receptors (PRRs) and activate pattern-triggered immunity (PTI). Microbial invasions often trigger the production of host-derived endogenous signals referred to as dangeror damage-associated molecular patterns (DAMPs), which are also perceived by PRRs to modulate PTI responses. Collectively, PTI contributes to host defense against infections by a broad range of pathogens. Remarkable progress has been made toward demonstrating the cellular and physiological responses upon pattern recognition, elucidating the molecular, biochemical, and genetic mechanisms of PRR activation as well as dissecting the complex signaling networks that orchestrate PTI responses...
May 19, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28521314/romantic-relationships-of-people-with-borderline-personality-a-narrative-review
#7
Sara Navarro-Gómez, Álvaro Frías, Carol Palma
BACKGROUND: Romantic relationships are one of the most interesting areas of interpersonal functioning in people with borderline personality. The aim of this narrative review was to synthesise empirical findings on this issue. SAMPLING AND METHODS: The PubMed and PsycINFO databases were searched for pertinent materials published between 1980 and March 2016. Thirty articles met the inclusion criteria. RESULTS: Several longitudinal and cross-sectional studies showed that people with borderline personality disorder (BPD) or BPD traits had more - but less prolonged - romantic relationships than people without BPD...
May 19, 2017: Psychopathology
https://www.readbyqxmd.com/read/28518101/using-wavelet-entropy-to-demonstrate-how-mindfulness-practice-increases-coordination-between-irregular-cerebral-and-cardiac-activities
#8
Hin Hung Sik, Junling Gao, Jicong Fan, Bonnie Wai Yan Wu, Hang Kin Leung, Yeung Sam Hung
In both the East and West, traditional teachings say that the mind and heart are somehow closely correlated, especially during spiritual practice. One difficulty in proving this objectively is that the natures of brain and heart activities are quite different. In this paper, we propose a methodology that uses wavelet entropy to measure the chaotic levels of both electroencephalogram (EEG) and electrocardiogram (ECG) data and show how this may be used to explore the potential coordination between the mind and heart under different experimental conditions...
May 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516909/heat-guiding-and-focusing-using-ballistic-phonon-transport-in-phononic-nanostructures
#9
Roman Anufriev, Aymeric Ramiere, Jeremie Maire, Masahiro Nomura
Unlike classical heat diffusion at macroscale, nanoscale heat conduction can occur without energy dissipation because phonons can ballistically travel in straight lines for hundreds of nanometres. Nevertheless, despite recent experimental evidence of such ballistic phonon transport, control over its directionality, and thus its practical use, remains a challenge, as the directions of individual phonons are chaotic. Here, we show a method to control the directionality of ballistic phonon transport using silicon membranes with arrays of holes...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28505867/collective-dynamics-out-of-thermodynamic-equilibrium
#10
Gordon Robb, Antonio Politi
Thorough numerical studies reveal that spatially extended dissipative systems with long-range interactions may give rise to a large-scale dynamics. This phenomenon, which generalizes mean-field chaos, can be interpreted as a form of subtle pattern formation, where a chaotic microscopic dynamics coexists with a macroscopic irregular behavior, sustained by the spontaneous emergence of long-wavelength "hydrodynamic" modes. This regime can emerge only if the coupling is sufficiently long ranged, otherwise normal space-time chaos is observed...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505840/evolutionary-fields-can-explain-patterns-of-high-dimensional-complexity-in-ecology
#11
James Wilsenach, Pietro Landi, Cang Hui
One of the properties that make ecological systems so unique is the range of complex behavioral patterns that can be exhibited by even the simplest communities with only a few species. Much of this complexity is commonly attributed to stochastic factors that have very high-degrees of freedom. Orthodox study of the evolution of these simple networks has generally been limited in its ability to explain complexity, since it restricts evolutionary adaptation to an inertia-free process with few degrees of freedom in which only gradual, moderately complex behaviors are possible...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505827/intermittent-feedback-induces-attractor-selection
#12
Kiran Yadav, Neeraj Kumar Kamal, Manish Dev Shrimali
We present a method for attractor selection in multistable dynamical systems. It involves a feedback term that is active only when the dynamics of the system is in a particular fraction of state space of the attractor. We implement this method first on a simplest symmetric chaotic flow and then on a bistable neuronal system. We find that adding this space-dependent feedback term to the dynamical equations of these systems will drive the dynamics to the desired attractor by annihilating the other. We further demonstrate that the attractor selection due to this feedback term can be used in construction of logic gates, which is one of the practical applications of the proposed method...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505811/chaotic-lagrangian-models-for-turbulent-relative-dispersion
#13
Guglielmo Lacorata, Angelo Vulpiani
A deterministic multiscale dynamical system is introduced and discussed as a prototype model for relative dispersion in stationary, homogeneous, and isotropic turbulence. Unlike stochastic diffusion models, here trajectory transport and mixing properties are entirely controlled by Lagrangian chaos. The anomalous "sweeping effect," a known drawback common to kinematic simulations, is removed through the use of quasi-Lagrangian coordinates. Lagrangian dispersion statistics of the model are accurately analyzed by computing the finite-scale Lyapunov exponent (FSLE), which is the optimal measure of the scaling properties of dispersion...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505710/temperature-of-a-single-chaotic-eigenstate
#14
Fausto Borgonovi, Francesco Mattiotti, Felix M Izrailev
The onset of thermalization in a closed system of randomly interacting bosons at the level of a single eigenstate is discussed. We focus on the emergence of Bose-Einstein distribution of single-particle occupation numbers, and we give a local criterion for thermalization dependent on the eigenstate energy. We show how to define the temperature of an eigenstate, provided that it has a chaotic structure in the basis defined by the single-particle states. The analytical expression for the eigenstate temperature as a function of both interparticle interaction and energy is complemented by numerical data...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28504952/exponential-synchronization-of-networked-chaotic-delayed-neural-network-by-a-hybrid-event-trigger-scheme
#15
Zhongyang Fei, Chaoxu Guan, Huijun Gao
This paper is concerned with the exponential synchronization for master-slave chaotic delayed neural network with event trigger control scheme. The model is established on a network control framework, where both external disturbance and network-induced delay are taken into consideration. The desired aim is to synchronize the master and slave systems with limited communication capacity and network bandwidth. In order to save the network resource, we adopt a hybrid event trigger approach, which not only reduces the data package sending out, but also gets rid of the Zeno phenomenon...
May 12, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28494680/end-of-life-care-in-emergency-departments-a-review-of-the-literature
#16
Kayla Gloss
Providing end of life care (EOLC) in emergency departments (EDs) is challenging because of minimal resources, lack of staff education and outdated models of care. Dynamic, chaotic environments like EDs require systematic, clear and concise principles and goals for patient care. Death in EDs is inevitable, therefore staff should be equipped to provide optimal care to this vulnerable patient group. This article reviews the literature on the barriers to providing EOLC in EDs, and makes recommendations for clinical practice and further research...
May 12, 2017: Emergency Nurse: the Journal of the RCN Accident and Emergency Nursing Association
https://www.readbyqxmd.com/read/28489549/secure-and-energy-efficient-data-transmission-system-based-on-chaotic-compressive-sensing-in-body-to-body-networks
#17
Haipeng Peng, Ye Tian, Jurgen Kurths, Lixiang Li, Yixian Yang, Daoshun Wang
Applications of wireless body area networks (WBANs) are extended from remote health care to military, sports, disaster relief, etc. With the network scale expanding, nodes increasing, and links complicated, a WBAN evolves to a body-to-body network. Along with the development, energy saving and data security problems are highlighted. In this paper, chaotic compressive sensing (CCS) is proposed to solve these two crucial problems, simultaneously. Compared with the traditional compressive sensing, CCS can save vast storage space by only storing the matrix generation parameters...
June 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28489368/on-the-fly-ab-initio-semiclassical-calculation-of-glycine-vibrational-spectrum
#18
Fabio Gabas, Riccardo Conte, Michele Ceotto
We present an on-the-fly ab initio semiclassical study of vibrational energy levels of glycine, calculated by Fourier transform of the wavepacket correlation function. It is based on a multiple coherent states approach integrated with monodromy matrix regularization for chaotic dynamics. All four lowest-energy glycine conformers are investigated by means of single-trajectory semiclassical spectra obtained upon classical evolution of on-the-fly trajectories with harmonic zero-point energy. For the most stable conformer I, direct dynamics trajectories are also run for each vibrational mode with energy equal to the first harmonic excitation...
May 10, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28487568/emergence-of-coupling-induced-oscillations-and-broken-symmetries-in-heterogeneously-driven-nonlinear-reaction-networks
#19
Varsha Sreenivasan, Shakti N Menon, Sitabhra Sinha
Many natural systems including the brain comprise coupled elements that are stimulated non-uniformly. In this paper we show that heterogeneously driven networks of excitatory-inhibitory units exhibit a diverse range of collective phenomena, including the appearance of spontaneous oscillations upon coupling quiescent elements. On varying the coupling strength a previously unreported transition is seen wherein the symmetries of the synchronization patterns in the stimulated and unstimulated groups undergo mutual exchange...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28485376/effect-of-adding-cerium-on-microstructure-and-morphology-of-ce-based-inclusions-formed-in-low-carbon-steel
#20
Z Adabavazeh, W S Hwang, Y H Su
Intra-granular Acicular Ferrite (IAF), as one of the most well-known desirable microstructure of ferrite with a chaotic crystallographic orientation, can not only refine the microstructure and retard the propagation of cleavage crack but also provide excellent combination of strength and toughness in steel. The effect of adding cerium on microstructure and controlling proper cerium-based inclusions in order to improve properties in low-carbon commercial steel (SS400) were investigated. The type of inclusions can be controlled by changing S/O ratio and Ce content...
May 9, 2017: Scientific Reports
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