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Abstract
Electrophysiological techniques were used to obtain recordings of extracellular electrical activity from the anterior end of live adult females of Brugia pahangi. Stimulation with 100 mM, 10 mM and 1 mM acetylcholine resulted in an increase in spike activity which was concentration dependent, whereas stimulation with phosphate-buffered saline and 0.1 mM acetylcholine gave no increase in activity. The delay in response was not concentration dependent. The action of possible host cues was investigated. Stimulation with heat-inactivated foetal calf serum (IFCS) and 10 mM glutathione gave an increase in spike activity but exposure to 5 mg/dl haemoglobin elicited no response. The response to IFCS was found to be suppressed completely by pre-incubation for 30 min in ivermectin.
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