Abstract
The effects of the insecticides DDT, dieldrin, DFP, o-IMPC, n-valone, or rotenone on the free amino acids of the central nerve cord of the American cockroach, Periplaneta americana, have been studied. Free amino acids were extracted from excised nerve cords of treated and untreated insects separated by two-dimensional paper chromatography and estimated colorimetrically. In all cases, with the exception of rotenone, insecticidal treatment resulted in a greatly reduced free proline concentration in the nerve. In nerve from insects treated with dieldrin, DFP or o-IMPC the loss of free proline was balanced by an increase in free α-alanine and glutamine. The accumulation of α-alanine in the nerve cord during rotenone or n-valone poisoning was too great to be explained by changes in the free amino acid pool.
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