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The Effects of DDT on Oxidative Metabolism in Susceptible and DDT-Resistant Aedes aegypti1,2

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Susceptible (S) Aedes aegypti(L.) larvae exhibited a higher respiratory rate than those of a DDT-resistant (R) strain. whereas various concentrations of DDT increased the rate of oxygen consumption of R larvae, low concentrations of the insecticide increased oxygen uptake of the S strain and high concentrations decreased it. when the temperature was increased from 28. to 37.1 ., the oxygen consumption of the R larvae was higher. As compared with intact larvae, homogenates exhibited a prolonged lag period in their oxygen uptake, after which oxygen was consumed at a greatly enhanced rate, which was higher in the S larvae.

The addition of the soluble fraction of the cell increased the oxygen uptake of mitochondria even when present in a concentration of only one-fifth that of the total homogenate.

Although DDT inhibited oxidative phosphorylation in both strains, the degree of in hibition was greater in the S strain. This inhibition \Vasdue largely to the reduction in the esterification of inorganic phosphate, the oxygen uptake being only slightly affected.

Document Type: Research Article

Publication date: June 1, 1961

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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