Abstract
Immunochemical titrations of different enzyme preparations from larval, pharate adult, and emerged adult Ceratitis capitata indicated that the changes in fatty acid synthetase activity during development of the insect are not related entirely to changes in the content of the enzyme. Changes in catalytic efficiency during larval and pharate adult development were clearly paralleled by the amounts of immunoprecipitate; however, the changes of enzyme activity with adult age were not correlated to the changes of enzyme content. Dietary manipulations of the larval stage of the insect Ceratitis capitata show the adaptive nature of the fatty acid synthetase. Fasting produced a clear decrease of activity and level of the enzyme from the larvae and refeeding restored practically normal values.
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