Abstract
In the cockroach, Leucophaea maderae, the optic lobes contain a circadian pacemaker. The metabolic activity of optic lobe neuropils was measured at 17 time points over a 24-h period in constant darkness, using cytochrome oxidase activity as functional marker. The results revealed a clear 24-h energy metabolism rhythm in neuropils and particularly in the lobula plate, a part of the region which is assumed to include a circadian pacemaker in this species.
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