BungarotoxinsAconitineReceptors, NicotinicDimethylphenylpiperazinium IodideDelphiniumNicotinic Antagonistsalpha7 Nicotinic Acetylcholine ReceptorDihydro-beta-ErythroidineReceptors, CholinergicNicotinic AgonistsNicotineMecamylamineZigadenusAzocinesPlant PoisoningQuinolizinesBinding SitesBicyclo Compounds, HeterocyclicBicyclo CompoundsCholinergic AgentsConotoxinsLethal Dose 50LobelineAcetylcholineAlkaloidsSynaptosomesRats, Sprague-DawleyCholineDose-Response Relationship, DrugHippocampusDopamineNeuronsPyridinesExcitatory Amino Acid AntagonistsPatch-Clamp TechniquesBinding, CompetitiveSynaptic Transmission