Changes in some haemolymph dehydrogenase isozymes of the female honeybee, Apis millifera L., during caste development

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Abstract
The electrophoretic distributions of six dehydrogenases are described for the two female castes of honeybee larvae. Pronounced differences with time within a caste and between castes were noted. Worker larval haemolymph showed a greater number of isozymes for all dehydrogenases studied except glyceraldehyde-3-phosphate.Spectrophotometric assays of three of the dehydrogenases gave quantitative expression to electrophoretic results. Haemolymph from worker larvae generally showed maximum activity earlier than that from queen larvae. Enzyme activity showed a general decline in both castes during the later stages of larval life. The activity of glucose-6-phosphate and 6-phosphogluconate dehydrogenases suggest that the pentose phosphate pathway of glucose metabolism is important during larval life.

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