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[Effects of clavines, ergot alkaloids, on the membrane potential of an identifiable giant neuron of the African giant snail Achatina fulica Ferussac]. 1980

M Miyamoto, and H Tamura, and H Takeuchi, and I Endo

The effects of seven clavines, alkaloids of ergot, on the electrical activity of an identifiable giant neurone (TAN, tonically autoactive neurone) of the African giant snail were examined. All the substances examined, lysergine, agroclavine, elymoclavine, festuclavine, chanoclavine, rugulovasine A and rugulovasine B, at 2 X 10(-4) kg/l have no constant effect on TAN, indicating that they have no direct effect on this neurone. However, the substances examined, except for chanoclavine, in the same concentration occasionally caused the transient depression with an augmentation of trans-synaptic influences. This depression may be due to the trans-synaptic influences. The four substances examined, lysergine, agroclavine, elymoclavine and festuclavine, in the same concentration produced TAN abnormal spike discharges, doublet or triplet spikes.

UI MeSH Term Description Entries
D008564 Membrane Potentials The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization). Resting Potentials,Transmembrane Potentials,Delta Psi,Resting Membrane Potential,Transmembrane Electrical Potential Difference,Transmembrane Potential Difference,Difference, Transmembrane Potential,Differences, Transmembrane Potential,Membrane Potential,Membrane Potential, Resting,Membrane Potentials, Resting,Potential Difference, Transmembrane,Potential Differences, Transmembrane,Potential, Membrane,Potential, Resting,Potential, Transmembrane,Potentials, Membrane,Potentials, Resting,Potentials, Transmembrane,Resting Membrane Potentials,Resting Potential,Transmembrane Potential,Transmembrane Potential Differences
D009474 Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM. Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D004876 Ergot Alkaloids Alkaloids originally isolated from the ergot fungus Claviceps purpurea (Hypocreaceae). They include compounds that are structurally related to ergoline (ERGOLINES) and ergotamine (ERGOTAMINES). Many of the ergot alkaloids act as alpha-adrenergic antagonists. Clavine Alkaloids,Alkaloids, Clavine,Alkaloids, Ergot
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012908 Snails Marine, freshwater, or terrestrial mollusks of the class Gastropoda. Most have an enclosing spiral shell, and several genera harbor parasites pathogenic to man. Snail

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