Abstract
1.1. Extramitochondrial glycerolphosphate dehydrogenase (l-glycerol-3-phosphate:DPN+ oxidoreductase, EC 1.1.1.8) was assayed in various tissues of the grasshopper Schistocerca vaga during the period from 3 days before to 8 days after the last molt.2.2. The specific activity, on protein basis, increase 8-fold in longitudinal dorsal flight muscles and 6-fold in the remaining pterothoracic flight muscles.3.3. The specific activity increases about 2-fold in two leg muscles (the flexor and extensor) and in fat body.4.4. The specific activity increases 6-fold in both mono- and bifunctional thoracic muscles. The former, the tergosternal muscles, are essentially only flight muscles. The latter, the thoracic coxal muscles, are active not only during adult flight but also during walking of the nymphs and adults.5.5. The relationship between tissue function and enzymitic development is discussed.
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