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Changes in membrane potential and potassium concentration in the extracellular space ([K+]e) of rabbit vagus nerve were measured simultaneously during electrical activity and during the period of recovery using a modified sucrose-gap method and potassium-sensitive microelectrodes. After stimulation for 15 s at 15 Hz the main activity-induced increase in(More)
Cultured mouse cortical astrocytes of the stellate type were studied by using the patch-clamp technique in whole-cell configuration. The astrocytes express at least two types of outwardly rectifying K+ channels which mediate a transient and a sustained current. Activation of AMPA receptors by kainate leads to a substantial blockade of both types of K+(More)
1. The electrophysiological properties of the rabbit vagus nerve (membrane potential, compound action potentials, and afterpotentials) and potassium accumulation were measured simultaneously during low-frequency stimulation (LFS) (0.5 and 1 Hz) by using a modified sucrose-gap apparatus and potassium-sensitive microelectrodes (KSM). 2. During LFS at 0.5 and(More)
Changes in membrane potential of both axons and Schwann cells were measured simultaneously during electrical activity and during the period of recovery in the rabbit vagus nerve by the use of the sucrose-gap apparatus. During low-frequency stimulation (0.5-1 Hz) the preparation developed a ouabain-sensitive hyperpolarization. This hyperpolarization(More)
In order to examine the possible effects of ecdysteroids on parturition, we studied in vitro the influence of ecdysone and 20-hydroxyecdysone on the motility of isolated uterus from virgin and pregnant female tsetse fly (Glossina fuscipes). Ecdysone initiates phasic uterine contractions or enhances the frequency of preexisting contractile activity. In(More)
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