Electromechanical Coupling
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. A MODEL OF ELECTROMECHANICAL COUPLING OF THE CARDIAC TISSUE THROUGH THE FINITE ELEMENT METHOD / Um modelo de acoplamento eletromecânico do tecido cardíaco através do método dos elementos finitos
Muitas doenças cardíacas podem ser relacionadas a padrões de ativação elétrica nas paredes do coração, denominadas de arritimias. Nesses casos a modelagem computacional tem se mostrado uma ferramenta útil na investigação e compreensão de complexos processos biofísics relacionados ao comportamento eletromecânico cardíaco. O presente trabalho te
Publicado em: 2008
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14. Modelagem e análise de desempenho dinâmico de complexos elétricos contendo centrais eólicas dotadas de geradores síncronos / Modeling and dynamic performance analysis of electric power systems containing wind installations equipped with synchronous generators
New generation resources, with low implantation and operation costs and that provoke the minimum possible impact to the environment, are undoubtedly focuses of attention to all the segments of the society. From this common sense, the alternative or renewable sources of energy, and particularly the wind, have certainly had a significant penetration in the com
Publicado em: 2007
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15. Modelagem e anÃlise de desempenho dinÃmico de complexos elÃtricos contendo centrais eÃlicas dotadas de geradores sÃncronos / Modeling and dynamic performance analysis of electric power systems containing wind installations equipped with synchronous generators
New generation resources, with low implantation and operation costs and that provoke the minimum possible impact to the environment, are undoubtedly focuses of attention to all the segments of the society. From this common sense, the alternative or renewable sources of energy, and particularly the wind, have certainly had a significant penetration in the com
Publicado em: 2007
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16. Mechanism of myocardial contractile depression by clinical concentrations of ethanol. A study in ferret papillary muscles.
Moderate alcohol intoxication in man, a ubiqitious social event, causes acute but reversible myocardial depression, the mechanism of which is unknown. We investigated whether this depression could be due to a direct effect of ethanol on the process of electromechanical coupling by simultaneously measuring the transmembrane action potential and contraction, o
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17. Surface acoustic wave propagation in Y- and Z-cut 0.67PbMgNbO3–0.33PbTiO3 single crystals
Surface acoustic wave (SAW) propogation in Y-cut and Z-cut relaxor-based 0.67Pb(Mg1∕3Nb2∕3)O3–0.33PbTiO3 (PMN-33%PT) ferroelectric single crystals poled along [001]c cubic direction has been analyzed theoretically. Characteristic curves were obtained for the phase velocity, electromechanical coupling coefficient and PFA of SAW in Y-cut and Z-cut PMN-33
American Institute of Physics.
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18. Phorbol ester effects on coupling mechanisms during cholinergic contraction of swine tracheal smooth muscle.
1. We studied effects of the phorbol ester, phorbol 12,13-dibutyrate (PDB), on carbachol-induced contractions of swine trachealis muscle. PDB (1-10 microM) markedly inhibited 5.5 microM-carbachol-induced inositol phosphate synthesis allowing us to study (a) whether the membrane potential-independent component of force (pharmacomechanical coupling component)
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19. Electrically driven motor in the outer hair cell: Effect of a mechanical constraint
The outer hair cell has a unique voltage-dependent motility associated with charge transfer across the plasma membrane. To examine mechanical changes in the membrane that are coupled with such charge movements, we digested the undercoating of the membrane with trypsin. We inflated the cell into a sphere and constrained the surface area by not allowing volume
The National Academy of Sciences.
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20. Loss of Annexin A7 Leads to Alterations in Frequency-Induced Shortening of Isolated Murine Cardiomyocytes
Annexin A7 has been proposed to function in the fusion of vesicles, acting as a Ca2+ channel and as Ca2+-activated GTPase, thus inducing Ca2+/GTP-dependent secretory events. To understand the function of annexin A7, we have performed targeted disruption of the Anxa7 gene in mice. Matings between heterozygous mice produced offspring showing a normal Mendelian
American Society for Microbiology.
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21. Myoblasts transplanted into rat infarcted myocardium are functionally isolated from their host
Survival and differentiation of myogenic cells grafted into infarcted myocardium have raised the hope that cell transplantation becomes a new therapy for cardiovascular diseases. The approach was further supported by transplantation of skeletal myoblasts, which was shown to improve cardiac performance in several animal species. Despite the success of myo
National Academy of Sciences.
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22. Alanine Scanning of the S6 Segment Reveals a Unique and cAMP-sensitive Association between the Pore and Voltage-dependent Opening in HCN Channels*
Hyperpolarization-activated cyclic nucleotide-modulated (HCN) channels resemble Shaker K+ channels in structure and function. In both, changes in membrane voltage produce directionally similar movement of positively charged residues in the voltage sensor to alter the pore structure at the intracellular side and gate ion flow. However, HCNs open when hyperpol
American Society for Biochemistry and Molecular Biology.
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23. Scaffold-Free Human Cardiac Tissue Patch Created from Embryonic Stem Cells
Progress in cardiac tissue engineering has been limited by (1) unfavorable cell and host responses to biomaterial scaffolds, (2) lack of suitable human cardiomyocyte sources, and (3) lack of fabrication techniques for scalable production of engineered tissue constructs. Here we report a novel and scalable method to generate scaffold-free human cardiac tissue
Mary Ann Liebert.
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24. Measurement of fluid viscosity at microliter volumes using quartz impedance analysis
The purpose of this work was to measure viscosity of fluids at low microliter volumes by means of quartz crystal impedance analysis. To achieve this, a novel setup was designed that allowed for measurement of viscosity at volumes of 8 to 10 μL. The technique was based on the principle of electromechanical coupling of piezoelectric quartz crystals. The arran
Springer-Verlag.