Transient Recovery Voltage
Mostrando 1-12 de 73 artigos, teses e dissertações.
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1. TRANSIENT RECOVERY VOLTAGE REQUIREMENTS FOR CIRCUIT BREAKERS: STUDY METHOD / TENSÃO DE RESTABELECIMENTO TRANSITÓRIA DE DISJUNTORES: METODOLOGIA DE ESTUDO
O trabalho desenvolvido estabelece uma metodologia de estudo para a determinação dos requisitos de tensão de restabelecimento transitória de disjuntores através de simulações em computador digital com a utilização do programa de cálculo de transitórios elétricos Electromagnetic Transients Program (EMTP) de Bonneville Power Administration (BPA).
Publicado em: 1986
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2. Two transient potassium currents in layer V pyramidal neurones from cat sensorimotor cortex.
1. Two transient outward currents were identified in large pyramidal neurones from layer V of cat sensorimotor cortex ('Betz cells') using an in vitro brain slice preparation and single-microelectrode voltage clamp. Properties of the currents deduced from voltage-clamp measurements were reflected in neuronal responses during constant current stimulation. 2.
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3. Calcium currents in rat thalamocortical relay neurones: kinetic properties of the transient, low-threshold current.
1. Calcium currents were recorded with whole-cell voltage-clamp procedures in relay neurones of the rat thalamus which had been acutely isolated by an enzymatic dissociation procedure. 2. Low-threshold and high-threshold Ca2+ currents were elicited by depolarizing voltage steps from holding potentials more negative than -60 mV. A transient current, analogous
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4. C-type inactivation controls recovery in a fast inactivating cardiac K+ channel (Kv1.4) expressed in Xenopus oocytes.
1. A fast inactivating transient K+ current (FK1) cloned from ferret ventricle and expressed in Xenopus oocytes was studied using the two-electrode voltage clamp technique. Removal of the NH2-terminal domain of FK1 (FK1 delta 2-146) removed fast inactivation consistent with previous findings in Kv1.4 channels. The NH2-terminal deletion mutation revealed a sl
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5. A study of the effect of the rate of stimulation on the transient outward current in sheep cardiac Purkinje fibres.
1. The transient outward current, Ito, of sheep Purkinje fibres has been recorded using the two micro-electrode voltage clamp technique. 2. Ito is strongly rate-dependent: the magnitude of Ito activated during a test voltage clamp pulse after a train of action potentials is less at higher rates of stimulation. 3. After an increase or decrease in rate there i
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6. Ca2+ regulation in the presynaptic terminals of goldfish retinal bipolar cells.
1. To investigate regulation of the intracellular free Ca2+ concentration ([Ca2+]i) in presynaptic terminals, the Ca2+ current (ICa) and [Ca2+]i in axon terminals were simultaneously monitored in acutely dissociated retinal bipolar cells under whole-cell voltage clamp. 2. The recovery phase of the Ca2+ transient, which was evoked by activation of ICa, became
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7. Inactivation of the low-threshold transient calcium current in rat sensory neurones: evidence for a dual process.
In rat cranial sensory neurones a transient Ca current (iCa,t) is elicited by depolarizing the membrane potential from -80 mV to beyond -50 mV. In this paper the characteristics of the slow and fast inactivation processes of this current are described. Recordings were obtained in whole-cell clamp conditions from Cs-loaded cells. For most experiments, cells w
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8. Effects of muscarine on single rat adrenal chromaffin cells.
1. The action of muscarine on membrane currents and cytosolic calcium (Ca2+) of dissociated rat adrenal chromaffin cells was investigated using standard whole-cell voltage-clamp techniques and microfluorimetry of unclamped single cells. 2. In cells held at a constant holding potential negative to -40 mV, brief (5-10 s) applications of muscarine produced a tr
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9. Osmo- and mechanosensitivity of the transient outward K+ current in a mammalian neuronal cell line.
1. The transient outward current in NG108-15 cells was investigated with the whole-cell patch-clamp technique. The current was inhibited by external 4-aminopyridine or tetra-ethylammonium. The reversal potential shifted rightward with increased external K+ concentrations. 2. Current inactivation was markedly accelerated in hyperosmotic media (+30 mosmol l-1)
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10. Differential actions of pentobarbitone on calcium current components of mouse sensory neurones in culture.
1. Using the single-electrode voltage clamp technique, three calcium current components were recorded at 35 degrees C from mouse dorsal root ganglion (DRG) neurones in culture. A transient low-threshold calcium current (T current) was recorded at clamp potentials (Vc) positive to -60 mV. Holding potentials (Vh) at or negative to -90 mV were required to fully
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11. Different types of K+ channel current are generated by different levels of a single mRNA.
A cloned human voltage-sensitive K+ channel HLK3 which is present in T-lymphocytes and in the brain was expressed in Xenopus oocytes and after permanent transfection of a human B-lymphocyte cell line (IM9). Injections of low cRNA concentrations into Xenopus oocytes led to the expression of a transient K+ current, with saturating current-voltage (I-V) relatio
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12. A fast, transient K+ current in neurohypophysial nerve terminals of the rat.
1. Nerve terminals of the rat posterior pituitary were acutely dissociated and identified using a combination of morphological and immunohistochemical techniques. Macroscopic terminal membrane currents and voltages were studied using the whole-cell patch clamp technique. 2. In physiological solutions, depolarizing voltage clamp steps, from a holding potentia