THE DEVELOPMENT OF BLOOD PROTEINS IN THE AFRICAN MIGRATORY LOCUST

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Abstract
The blood proteins of the African migratory locust were investigated at timed stages of development by immunodiffusion and gel electrophoresis. Blood protein concentration was also determined during the life cycle. The blood proteins showed a cyclical change in concentration during each nymphal instar studied. In the adult, blood protein concentration began to increase 6 days after the final molt and reached a maximum at 21 days. Variations in blood protein pattern detected by immunodiffusion and electrophoresis were most marked in the first instar and in the adult insect. These stages were the only ones in which the egg protein was detected. The egg protein was found in the maturing ovary of the adult female, but was absent from the male. No other tissue was found to contain blood protein at any stage of development. Histochemical staining of the polyacrylamide gels by the PAS method, Alcian blue, and Sudan black demonstrated that carbohydrate, mucopolysaccharide, and lipid were associated with certain of the blood proteins.

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