strophanthidin/atrofiere

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Membrane properties of neuroglia in the optic nerve of Necturus.

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The optic nerve of Necturus has proved a useful preparation for the study of glial cell membranes in vivo and in vitro with anatomical relations to axons intact and isolated following axon degeneration. The glial membrane potential behaves as a selective potassium diffusion potential; there is no

Vulnerability of medium spiny striatal neurons to glutamate: role of Na+/K+ ATPase.

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In Huntington's disease neuronal degeneration mainly involves medium-sized spiny neurons. It has been postulated that both excitotoxic mechanisms and energy metabolism failure are implicated in the neuronal degeneration observed in Huntington's disease. In central neurons, > 40% of the energy

Myocardial energetics during ventricular fibrillation investigated by magnetization transfer nuclear magnetic resonance spectroscopy.

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Ventricular fibrillation (VF) is known to produce alterations in myocardial energetics, but the mechanism of these changes remains unclear. To investigate energy metabolism during VF, phosphorus nuclear magnetic resonance spectroscopy and magnetization transfer were applied to isolated perfused

Summer pheasant's eye (Adonis aestivalis) poisoning in three horses.

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Three horses died as a result of eating grass hay containing summer pheasant's eye (Adonis aestivalis L.), a plant containing cardenolides similar to oleander and foxglove. A 9-year-old thoroughbred gelding, a 20-year-old appaloosa gelding, and a 5-year-old quarter horse gelding initially presented

Ischemic heart failure: sustained inotropic response to small doses of I-epinephrine without toxicity.

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As a prelude to a study of severe ischemic heart failure, the therapeutic response of the ischemic ventricle to epinephrine and acetylstrophanthidin in nontoxic doses was determined in 24 intact anesthetized dogs undergoing a first episode of acute regional ischemia. A thrombotic obstruction was

Calcium oscillations in digitalis-induced ventricular fibrillation: pathogenetic role and metabolic consequences in isolated ferret hearts.

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The pathophysiology of the ventricular fibrillation that complicates digitalis intoxication was investigated. In this and other calcium-overload states, oscillations of the intracellular free calcium concentration ([Ca2+]i) have been implicated as the cause of ventricular tachyarrhythmias. We

Excessive intracellular Ca2+ inhibits glutamate-induced Na(+)-K+ pump activation in rat hippocampal neurons.

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1. The effects of increased intracellular Ca2+ concentration ([Ca2+]i) on Na(+)-K+ pump activity in CA1 pyramidal neurons of rat hippocampal slices were investigated. The postglutamate hyperpolarization (PGH), which follows glutamate (GLU)-induced depolarization (GD), was used as an index of

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