ANALYSIS OF SOME TEMPERATURE EFFECTS ON DROSOPHILA PUPAE

¹ Department of Zoology, Syracuse University, Syracuse, New York, The Rockefeller University, New York, New York, and Marine Biological Laboratory, Woods Hole, Massachusetts

1. A previously presented scheme unifying a variety of high temperature effects on day-old Drosophila melanogaster pupae has been confirmed substantially by a large body of new data. Several minor modifications have been made.

2. New experiments confirm the validity of analyzing heat-induced temperature adaptation over a several-hour period at the end of the first day of pupal development.

3. Several new types of experiments have been described which involve combinations of exposures to more than one temperature and which provide information on the transitions between several intermediate stages in the scheme.

4. A double temperature-dependence is demonstrated in which both the amount of a precursor and the rate of its conversion vary with temperature in a particular range. In this range, the temperature coefficient of crossvein defect induction is the product of two components. This property inheres in branched pathways.

5. Rate constants and temperature coefficients have been calculated for the individual steps on the basis of data from specific experiments.

6. The scheme incorporates the information from a large array of detailed experiments and is capable of generalization over a broad temperature range.

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