Half Cell Potentials
Mostrando 1-12 de 186 artigos, teses e dissertações.
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1. Estudo sobre fatores influentes nos resultados de ensaios não destrutivos em concreto endurecido / Study on influential factors on the results of nondestructive testing in hardened concrete
O avanço tecnológico recente tem proporcionado significativas contribuições para a engenharia civil, com destaque especial para os ensaios não destrutivos utilizados nas estruturas de concreto armado. Usualmente, a propriedade mais avaliada do concreto é a resistência à compressão, porém, dentre outras características, a durabilidade exerce expres
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2011
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2. AVALIAÇÃO DO DESEMPENHO DE CONCRETOS COM ADIÇÕES MINERAIS QUANTO À CORROSÃO DAS ARMADURAS INDUZIDA POR CLORETOS / Performance evaluation of concretes content with mineral additions in relation to the reinforcing steels corrosion induced by chlorides
The present work aims to study the performance of concrete with regard to the action of chloride ions, evaluating the influence of both mineral additions and water/binder ratio (w/b), considering kinetic and thermodynamic aspects of the corrosive phenomenon. A experimental research was carried out considering the following variables: the presence of mineral
Publicado em: 2007
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3. Non-linearities in the responses of turtle hair cells
1. Intracellular recordings were made from single cochlear hair cells in the isolated half-head of the turtle. Receptor potentials were recorded while the ear was stimulated with high-intensity tones in order to examine the cochlear non-linearities which shape the hair cell responses.
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4. A charybdotoxin-insensitive conductance in human T lymphocytes: T cell membrane potential is set by distinct K+ channels.
1. Changes in the membrane potential (Vm) of human T lymphocytes upon K+ channel block were inferred from alterations in K+ current reversal potential in cell-attached patches. It was found that a high concentration of charybdotoxin (100 nM, CTX), which blocks both voltage-gated (K(V)) and Ca(2+)-activated (K(Ca)) potassium channels in these cells, depolariz
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5. Action potentials, macroscopic and single channel currents recorded from growth cones of Aplysia neurones in culture.
Action potentials, macroscopic ionic currents and single channel currents were recorded from growth cones of Aplysia right upper quadrant (r.u.q.) cells in culture, using the patch-clamp technique. Recordings were obtained from both intact growth cones and from growth cones that had been mechanically isolated from the rest of the neurone. In current-clamp mo
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6. Action potential initiation and propagation in rat neocortical pyramidal neurons.
1. Initiation and propagation of action potentials evoked by extracellular synaptic stimulation was studied using simultaneous dual and triple patch pipette recordings from different locations on neocortical layer 5 pyramidal neurons in brain slices from 4-week-old rats (P26-30) at physiological temperatures. 2. Simultaneous cell-attached and whole-cell volt
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7. Structural and functional analysis of synaptic transmission between identified leech neurones in culture.
The fine structure and physiological properties of chemical synapses that develop between identified leech neurones in culture have been studied by electron microscopy and by quantal analysis. Earlier work has shown that the transmitter liberated by isolated Retzius cells, serotonin, evokes chloride-dependent inhibitory post-synaptic potentials (i.p.s.p.s) i
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8. Distinct voltage-dependent gating behaviours of a swelling-activated chloride current in human epithelial cells.
1. The swelling-activated chloride current is critical in the homeostatic regulatory volume decrease (RVD) of both excitable and non-excitable cells. Although not activated by voltage, it displays kinetic behaviour similar to voltage-gated Shaker-type potassium currents. We have studied the voltage-dependent properties of this current in single T84 human cel
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9. Two Distinct Types of Inhibition Mediated by Cartwheel Cells in the Dorsal Cochlear Nucleus
Individual neurons have been shown to exhibit target cell-specific synaptic function in several brain areas. The time course of the postsynaptic conductances (PSCs) strongly influences the dynamics of local neural networks. Cartwheel cells (CWCs) are the most numerous inhibitory interneurons in the dorsal cochlear nucleus (DCN). They are excited by parallel
American Physiological Society.
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10. The whole-cell Ca2+ channel current in single smooth muscle cells of the guinea-pig ureter.
1. Calcium channel currents were recorded in single, enzymatically isolated smooth muscle cells of the guinea-pig ureter using a single-electrode whole-cell voltage clamp technique. Calcium and barium currents through voltage-activated Ca2+ channels were recorded in cells dialysed with Cs(+)- or Na(+)-containing saline which suppressed K+ currents. 2. Inward
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11. Microinjection of catalytic subunit of cyclic AMP-dependent protein kinase enhances calcium action potentials of bag cell neurons in cell culture
We have found that the calcium action potentials of bag cell neurons from the abdominal ganglion of Aplysia may be enhanced by intracellular microinjection of the catalytic subunit of cyclic AMP-dependent protein kinase (ATP:protein phosphotransferase, EC 2.7.1.37). The catalytic subunit was purified from bovine heart and shown to be effective in stimulating
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12. Glycine receptors in cultured chick sympathetic neurons are excitatory and trigger neurotransmitter release.
1. Total RNA isolated from embryonic chick paravertebral sympathetic ganglia was used in a reverse transcription-polymerase chain reaction (RT-PCR) assay with a pair of degenerate oligonucleotide primers deduced from conserved regions of mammalian glycine receptor alpha-subunits. Three classes of cDNA were identified which encode portions of the chicken homo