Abstract
Pyruvic oxime−2 14C and pyruvate−2 14C were injected into larvae of the silkworm, Bombyx mori L. The label in pyruvate−2 14C is incorporated into the gut and body proteins, but the small amount of activity found in protein following injection of pyruvic oxime−2 14C is of a much lower order and does not increase or decrease with time. 14CO 2 is expired following injection of pyruvate−2 14C, whereas the activity in CO 2 after injection of pyruvic oxime−2 14C is negligible. Chromatographic analysis of aqueous extracts of faecal pellets following injection or feeding of pyruvic oxime −2 14C indicates that it is rapidly excreted unchanged and is not converted to pyruvate −2 14C. The results of these experiments suggest that transoximase and oximase, if they are present, are of little importance in the protein and carbohydrate metabolism of the silkworm.
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