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Changes in urea in the haemolymph of the silkworm, Bombyx mori in the fourth and fifth larval instars and effect of starvation in the fifth instar on the level of urea in the pharate adults



Changes in urea in the haemolymph of the silkworm, Bombyx mori in the fourth and fifth larval instars and effect of starvation in the fifth instar on the level of urea in the pharate adults



Comparative Biochemistry and Physiology A, Comparative Physiology 97(3): 373-379



Changes in urea in the haemolymph during development in the silkworm Bombyx mori was investigated in individuals that were reared on artificial diet and on fresh mulberry leaves. In the 4th- and 5th-instar larvae, the changing pattern and the level of urea were similar in silkworms reared on artificial diet and in those reared on fresh mulberry leaves. A peak of concn of urea, approximately 0.7 mg urea N/ml, was observed in each instar.

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