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Extracts of whole adult males of Gryllus bimaculatus show distinct maxima of free ecdysteroids on the 8th, 12th and 14th day after imaginal moult at a breeding temperature of 25 °C. Isolated OEFC of 11 days old males secrete in vitro free as well as conjugated ecdysteroids, although the latter predominate. The bulk of free ecdysteroids seem s to consist of E and 20 E according to their retention times in two HPLC systems. Apart from the polar ones, apolar m etabolites appear during incubation. By esterase the apolar metabolites are mostly split into polar ones, partly into 20 E and E. Further treatment of the polar metabolites with helicase leads again to E and 20 E. OEFC transform [ 3 H]E preferably into apolar and polar conjugates, with dominance of the apolar ones at the beginning and of polar ones in the further course of incubation. Only a small quantity of free 20 E is found during this experiment, but it can be produced in significant quantities by splitting the polar conjugates. N o conversion of [ 3 H]cholesterol into [ 3 H]ecdysteroids could be detected.

Secretion and Metabolism of Ecdysteroids by Oenocyte-Fat Body Complexes (OEFC) in Adult Males of Gryllus bimaculatus DEG (Insecta)