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By Morris Rockstein

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The generation of glucose 1-phosphate from glycogen reserves present in the nerve cord of P. americana has been shown to be controlled by an endogenous phenolic amine (octopamine) and the hyperglycemic hormone. Octopamine, like the hyperglycemic hormone, appears to activate glycogen phosphorylase by 34 G. 0 a From Vejbjerg and Normann (1974). ^Operations performed 60 min before onset of flight. Hemolymph samples drawn after 45 min of flight. increasing the rate of synthesis of cyclic AMP, and to be the primary glycogenolytic agent in the nerve cord.

Synthesis, Nature, and Storage of Carbohydrate Reserves In most insects carbohydrate reserves are present as glycogen and trehalose which can be readily converted into glucose. In addition, various amounts of glycoproteins may be present, especially in the hemolymph. , glucose synthesis from noncarbohydrate substrates) and fatty acid synthesis from glucose will also be discussed in this section. 1. Glycogen Synthesis Glycogen, a branched chain polysaccharide composed of a-Dglucopyranose residues, represents the major reserve polysaccharide of insects.

VIII. CARBOHYDRATES IN INSECT METABOLISM A. Synthesis, Nature, and Storage of Carbohydrate Reserves In most insects carbohydrate reserves are present as glycogen and trehalose which can be readily converted into glucose. In addition, various amounts of glycoproteins may be present, especially in the hemolymph. , glucose synthesis from noncarbohydrate substrates) and fatty acid synthesis from glucose will also be discussed in this section. 1. Glycogen Synthesis Glycogen, a branched chain polysaccharide composed of a-Dglucopyranose residues, represents the major reserve polysaccharide of insects.

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