Potassium Residual Effect
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Relationship between Fungal Biomass Production and the Brightening of Hardwood Kraft Pulp by Coriolus versicolor
The white-rot fungus Coriolus versicolor increased the brightness of hardwood kraft pulp by two mechanisms depending on the concentration of available nitrogen. In low-nitrogen conditions, the brightening process was a chemical effect mediated by the fungus, associated with the removal of residual lignin in the pulp; kappa number was used as an indicator of
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14. Mechanisms underlying kainate receptor-mediated disinhibition in the hippocampus
Kainate (KA) receptor activation depresses stimulus-evoked γ-aminobutyric acid (GABA-mediated) synaptic transmission onto CA1 pyramidal cells of the hippocampus and simultaneously increases the frequency of spontaneous GABA release through an increase in interneuronal spiking. To determine whether these two effects are independent, we examined the mechanism
The National Academy of Sciences.
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15. Contribution of GIRK2-mediated postsynaptic signaling to opiate and α2-adrenergic analgesia and analgesic sex differences
The analgesia produced by inhibitory G protein-coupled receptor agonists involves coordinated postsynaptic inhibition via G protein-coupled inwardly rectifying potassium channels (GIRKs) and presynaptic inhibition of neurotransmitter release through regulation of voltage-gated Ca2+ channels. Here, we used mice lacking the GIRK2 channel subunit to assess the
The National Academy of Sciences.
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16. Differential effects of temperature on three components of passive permeability to potassium in rodent red cells.
The effect of temperature on ouabain-insensitive fluxes of K+ was characterized in red cells from a non-hibernator (guinea-pig) and a hibernator (thirteen-lined ground squirrel). The residual K+ influx which remains in the presence of ouabain and bumetanide, and which is linearly dependent on [K+]o was the same in the erythrocytes of the two species at low t
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17. Release of intracellular calcium and modulation of membrane currents by caffeine in bull-frog sympathetic neurones.
1. Calcium release and sequestration were studied in whole-cell voltage-clamped bull-frog sympathetic neurones by image analysis of Fura-2 signals. 2. Application of caffeine (10 mM) to cells voltage clamped at -38 mV caused a rapid increase in intracellular calcium concentration ([Ca2+]i) to a mean value of 352 +/- 33 nM, which activated an outward current.
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18. Excitatory amino acids in synaptic excitation of rat striatal neurones in vitro.
1. Intracellular recordings were made from rat striatal neurones in vitro. The cells had resting membrane potentials greater than -60 mV and action potentials greater than 70 mV with spike overshoot of 10-30 mV. 2. In the presence of bicuculline intrastriatal stimulation evoked an excitatory postsynaptic potential (EPSP). The relationship between EPSP amplit
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19. gamma-Aminobutyric acid responses in rat locus coeruleus neurones in vitro: a current-clamp and voltage-clamp study.
1. Intracellular recordings were made from locus coeruleus (LC) neurones in a totally submerged brain slice preparation from adult rats. The effect of gamma-aminobutyric acid (GABA) on LC neurones was studied under current-clamp and voltage-clamp conditions. GABA caused inhibition of spontaneous firing and a large conductance increase in LC neurones. These e
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20. Calcium-dependent potassium conductance in guinea-pig olfactory cortex neurones in vitro.
1. Guinea-pig olfactory cortex neurones in vitro (23-25 degrees C) were voltage clamped by means of a single-micro-electrode sample-and-hold technique. 2. Under current clamp at the resting potential (approximately -80 mV), brief depolarizing stimuli evoked trains of action potentials with little visible after-potential. However, in 90% of recorded cells hel