Abstract
Triglyceride utilization is correlated with glycogen resynthesis in developing Ascaris suum larvae. Glycogen content, determined by amyloglucosidase hydrolysis at 2-day intervals, decreases sharply during embryonation from 15% (per mg dry weight) at day 4 to 2% at day 12. Thereafter glycogen increases 3-fold through day 20, marking the resynthesis period. Triglyceride lipid droplets are confirmed primarily to the posterior half of the larvae and mark the site of the interconversion. Although they serve as precursors to glycogen, only a small diminution was observed ultrastructurally. Glycogen accumulation, on the other hand, correlates well with increases determined biochemically. alpha-glycogen builds up among lipid droplets, while beta-glycogen concentrates in the cytoplasm of somatic muscle cells paralleling myofibril development. Dense granules, restricted to the lipid body region, are considered as the possible subcellular site for the enzymatic conversion.
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