A5071530468- Quantum chaos and dynamical systems
- Nonlinear Dynamics and Pattern Formation
- Chaos control and synchronization
- Complex Systems and Time Series Analysis
- Theoretical and Computational Physics
- Magnetic confinement fusion research
- Fluid Dynamics and Turbulent Flows
- Mathematical Dynamics and Fractals
- Opinion Dynamics and Social Influence
- Advanced Thermodynamics and Statistical Mechanics
- Gene Regulatory Network Analysis
- Complex Network Analysis Techniques
- stochastic dynamics and bifurcation
- Stochastic processes and statistical mechanics
- Ion channel regulation and function
- Neuroscience and Neuropharmacology Research
- Statistical Mechanics and Entropy
- Evolution and Genetic Dynamics
- Nonlinear Photonic Systems
- Fractional Differential Equations Solutions
- Evolutionary Game Theory and Cooperation
- Advanced Mathematical Modeling in Engineering
- Gas Dynamics and Kinetic Theory
- Hormonal Regulation and Hypertension
- Nicotinic Acetylcholine Receptors Study
Universidade Federal do Ceará
2012-2024
Universidade Federal de Pernambuco
2022
Universidade Federal de Minas Gerais
2006-2020
Centro Hospitalar de Vila Nova de Gaia
2009-2018
Centre National de la Recherche Scientifique
2002-2017
Centre de Physique Théorique
2001-2017
Université de Toulon
2000-2017
Aix-Marseille Université
2000-2017
Canadian Nautical Research Society
2015
Universidade de Fortaleza
2015
Starting from a chaotic regime in the dynamics of Duffing-Holmes oscillator, we show how it is possible, by means small parametric perturbation suitable frequency, to bring system regular regime. This situation studied analytic point view using Melnikov method and numerical computing Lyapunov exponents. The corresponding bounds for are compared. Noting that time, measured along original unperturbed separatrix, elapses between two successive homoclinic intersections grows when approach...
The investigation of fluctuation phenomena in plasmas often necessitates the analysis spatiotemporal signals. It is shown how such signals can be analyzed using biorthogonal decomposition, which splits them into orthogonal spatial and temporal modes. method, also referred to as singular value allows complex patterns decomposed a few coherent modes that are easier interpret. This illustrated with two applications fluctuating soft x-ray magnetic signals, measured tokamak. Emphasis given...
The vesicular acetylcholine (ACh) transporter (VAChT) mediates ACh storage by synaptic vesicles. However, the VAChT-independent release of is believed to be important during development. Here we generated VAChT knockout mice and tested physiological relevance ACh. Homozygous died shortly after birth, indicating that VAChT-mediated essential for life. Indeed, synaptosomes obtained from brains homozygous knockouts were incapable releasing in response depolarization. Surprisingly,...
Overwhelming evidence supports the importance of sympathetic nervous system in heart failure. In contrast, much less is known about role failing cholinergic neurotransmission cardiac disease. By using a unique genetically modified mouse line with reduced expression vesicular acetylcholine transporter (VAChT) and consequently decreased release acetylcholine, we investigated consequences altered tone for function. M-mode echocardiography, hemodynamic experiments, analysis isolated perfused...
We present numerical results on a model in which quantization of chaos (instead suppression the diffusion) leads to diffusive or even faster excitation with infinite conductance corresponding solid-state model. suggest possible mechanism for this effect.
A W* -category is the categorical counterpart of a von Neumann algebra with an abstract definition equivalent to concrete in terms operators between Hubert spaces.We develop elementary theory -categories including modular and comparison objects (equivalence quasiequivalence).We also characterize certain W*-categories W*-category projections algebra, self-dual Hermitian modules for or normal representations algebra.This leads naturally discussion Morita equivalence algebras -categories.
Defining the contribution of acetylcholine to specific behaviors has been challenging, mainly because difficulty in generating suitable animal models cholinergic dysfunction. We have recently shown that, by targeting vesicular transporter (VAChT) gene, it is possible generate genetically modified mice with deficiency. Here we describe novel VAChT mutant lines. gene embedded within first intron choline acetyltransferase (ChAT) which provides a unique arrangement and regulation for these two...
We describe a quantum Hamiltonian in one dimension with quasiperiodic interaction, giving rise to metal-insulator transition at high coupling. This model applies linear wave propagation modulated medium, naturally resulting potentials incommensurate periods, as is the case for organic conductor chains.
Mammalian motor nerve terminals contain hundreds of thousands synaptic vesicles, but only a fraction these vesicles is immediately available for release, the remainder forming reserve pool. The supply replenished through endocytosis, and newly formed are refilled with acetylcholine process that depends on vesicular transporter (VAChT). During expression short-term plasticity, quantal release can be increased, it unknown whether this reflects enhanced recruitment from pool or rapid recycling....
Chaotic diffusion often represents a severe obstacle for the setup of experiments, e.g., in fusion plasmas or particle accelerators. We present complete test method control Hamiltonian chaos, with both its numerical and first experimental realization on paradigm wave-particle interaction, i.e., travelling wave tube. The core our approach is small apt modification system which channels chaos by building barriers to diffusion. Its opens possibility practically achieve wide range systems at low...
The Mas protooncogene encodes a G protein-coupled receptor that has been described as functional for the cardioprotective fragment of renin-angiotensin system (RAS), Angiotensin (Ang)-(1-7). aim this current study was to evaluate responsiveness expression in hearts during different physiological and pathological conditions rats. Physical training considered condition, while isoproterenol-induced hypertrophy, myocardial infarction DOCA-salt model hypertension were used models heart injury....
It is shown that a relevant control of Hamiltonian chaos possible through suitable small perturbations whose form can be explicitly computed. In particular, it to (reduce) the chaotic diffusion in phase space system with 1.5 degrees freedom which models charged test particles turbulent electric field across confining magnetic controlled thermonuclear fusion devices. Though still far from practical applications, this result suggests some strategy transport magnetized plasmas, tokamaks,...
High serum levels of aldosterone have been linked to the development cardiac disease. In contrast, angiotensin (Ang)-(1-7) was extensively shown possess cardioprotective effects, including attenuation dysfunction induced by excessive mineralocorticoid activation in vivo, suggesting possible interactions between these 2 molecules. Here, we investigated whether there is cross-talk and Ang-(1-7) its functional consequences for calcium (Ca(2+)) signaling ventricular myocytes. Short-term effects...
Mineralocorticoids have been implicated in the pathogenesis of diastolic heart failure. On contrary, angiotensin (Ang)-(1–7) has emerged as a potential strategy for treatment cardiac dysfunction induced by excessive mineralocorticoid receptor activation. A critical question about cardioprotective effect Ang-(1–7) hypertensive models is its dependence on blood pressure (BP) reduction. Here, we addressed this investigating mechanisms involved cardioprotection against Sprague-Dawley (SD) and...