Equivalent Currents
Mostrando 13-24 de 59 artigos, teses e dissertações.
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13. Mecanismo molecular de ação da Ts3 em canais de sódio dependentes de voltagem
Voltage-gated sodium channels are the molecular targets of several groups of toxins that bind to specific receptor sites and modify their function. The well-know a-scorpion toxins bind in a voltage-dependent way to site 3, which is partially formed by the extracellular loop connecting S3 and S4 segments of domain IV, slowing down fast inactivation. While the
Publicado em: 2006
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14. FORMULACIONES ASINTÓTICAS PARA EL ESPARCIMIENTO POR SUPERFICIES CONDUCTORAS EN EL DOMINIO DEL TIEMPO Y APLICACIONES AL ANÁLISIS DE TRANSIENTES EN ANTNAS REFLECTORAS / FORMULAÇÕES ASSINTÓTICAS PARA O ESPALHAMENTO POR SUPERFÍCIES CONDUTORAS NO DOMÍNIO DO TEMPO E APLICAÇÕES À ANÁLISE DE TRANSIENTES EM ANTENAS REFLETORAS / ASYMPTOTIC FORMULATIONS FOR TIME-DOMAIN SCATTERING BY CONDUCTING SURFACES AND APPLICATION TO THE TRANSIENT ANALYSIS OF REFLECTOR ANTENNAS
EL objetivo de este trabajo es el estudio y desarrollo de técnicas asintóticas que permitan el análisis del esparcimiento de ondas eletromagnéticas por superficies conductoras, directamente del dominio del tiempo. Se introducen versiones temporales de métodos de rastreamiento de rayos y de técnicas de corrientes inducidas y equivalentes, las cuales son
Publicado em: 2001
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15. Modelo e analise do motor de indução bifasico assimetrico com o estator conectado em T
This dissertation has the aim of determining a mathematical model for asymmetrical two-phase induction motor with T-connected stator windings and to investigate some properties such as free acceleration, steady-state torque-speed characteristic and steady-state currents. This motor is designed to operate from supply of two phases and neutral, and a particula
Publicado em: 1996
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16. Modelamento de transistores bipolares de heterojunção
A study about current transport mechanism through a heterojunction is presented. Drift and diffusion mechanism are not enough to describe the electrical current (due to a spike in the conduction band of the Npn transistor). This has led to the introduction of the Thermionic-Emission mechanism. The Ebers-Moll and Gummel-Poon models are also compatible with th
Publicado em: 1995
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17. Charge displacements in a single potassium ion channel macromolecule during gating.
Single ion channel currents can only provide indirect information on channel molecular events (except for timing). In contrast, the electric displacement currents associated with channel gating, termed gating currents, can provide direct information regarding the channel molecule's conformational changes. However, thus far gating currents have been measured
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18. Tunicamycin increases desensitization of acetylcholine receptors in cultured mouse muscle cells.
Whole-cell currents activated by acetylcholine (AcCho) were recorded in C2 mouse myotubes before and after prolonged treatment with tunicamycin, an inhibitor of glycosylation. In control cells the AcCho-induced currents decayed slowly even in the continuous presence of AcCho. After 24 hr of treatment with tunicamycin AcCho still elicited currents, but their
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19. A Tight-Seal Whole Cell Study of the Voltage-Dependent Gating Mechanism of K+-Channels of Protoplasmic Droplets of Chara corallina1
The biophysical properties of voltage-dependent K+-channels of protoplasmic droplets of Chara corallina Klein ex Willd., em, R.D.W. were investigated using the tight-seal whole cell method. Two potassium currents were observed in voltage-clamp mode and they can be used to explain the transient membrane potential time course observed in current-clamp mode. Th
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20. Spontaneous quantal currents in a central neuron match predictions from binomial analysis of evoked responses.
Inhibitory postsynaptic currents occurring spontaneously in the teleost Mauthner cell were analyzed with the single-electrode voltage-clamp technique. They were collected during depolarizing steps and were outward-going; this procedure allowed them to be isolated from possible excitatory currents flowing in the opposite direction. Their amplitude histograms
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21. Membrane currents underlying the cholinergic slow excitatory post-synaptic potential in the rat sympathetic ganglion.
Non-nicotinic slow synaptic currents were recorded from voltage-clamped neurones in isolated rat superior cervical ganglia bathed in a solution containing d-tubocurarine and (usually) 1 microM-neostigmine. Three components of slow synaptic current could be detected following repetitive preganglionic stimulation: a net inward current resulting from inhibition
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22. Sulfate Is Both a Substrate and an Activator of the Voltage-Dependent Anion Channel of Arabidopsis Hypocotyl Cells1
On the basis of the anion content of in vitro-cultured Arabidopsis plantlets, we explored the selectivity of the voltage-dependent anion channel of the plasma membrane of hypocotyl cells. In the whole-cell configuration, substitution of cytosolic Cl− by different anions led to the following sequence of relative permeabilities: NO3− (2.6) ≥ SO42− (2.0
American Society of Plant Physiologists.
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23. Synaptic- and agonist-induced excitatory currents of Purkinje cells in rat cerebellar slices.
1. Postsynaptic currents originating from activation of the two major excitatory inputs to Purkinje cells were studied in thin slices of rat cerebellum, using the tight-seal whole-cell recording technique. Two types of excitatory postsynaptic currents were analysed: those evoked by stimulation of the granule cell-parallel fibre system (PF-EPSC) and those eli
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24. Concentration and pH dependence of skeletal muscle chloride channel ClC-1.
1. The influence of Cl- concentration and pH on gating of the skeletal muscle Cl- channel, ClC-1, has been assessed using the voltage-clamp technique and the Sf-9 insect cell and Xenopus oocyte expression systems. 2. Hyperpolarization induces deactivating inward currents comprising a steady-state component and two exponentially decaying components, of which