Abstract
The objective of this study was to ascertain if proline can be used as a substrate by insect brains. Utilization of d-[U 14C]glucose and l-[U 14C]proline by isolated brains from 25 different species of insects, belonging to six separate orders, was measured using a radiomicrorespirometric method. Glucose utilization is more pronounced in brains of relatively smaller and highly evolved insects than in larger and more primitive insects. Brains of Blattodea exhibit little proline utilization. 14CO 2 production from labelled glucose and proline in brains of insects seems to be correlated with the metabolic rate of these organs.
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