The action of insecticides on neurosecretory neurons in the stick insect, Carausius morosus |
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Authors: | I Orchard MP Osborne |
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Institution: | Department of Zoology and Comparative Physiology, Birmingham, P.O. Box 363, Birmingham B15 2TT, England |
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Abstract: | The action of insecticides on the spontaneous electrical activity of neurohemal tissue in the stick insect, Carausius morosus, has been studied using extracellular electrodes. The pyrethroid, permethrin, causes a massive increase in the frequency of the spontaneously generated action potentials at concentrations between 5 × 10?5 and 5 × 10?8M. Concentrations as low as 5 × 10?11M are still effective in producing bursting activity.DDT, at concentrations between 5 × 10?5M and 5 × 10?6M, produces an overall increase in activity although the bursting activity is less violent than that shown with permethrin. DDT, 5 × 10?7M, is ineffective at altering the resting pattern.Carbaryl and coroxon cause a transitory increase in electrical activity at 1 × 10?4M, but are ineffective at 1 × 10?5M.It is concluded that insecticides could have a direct effect upon the neurohormonal balance in insects. |
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