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- W2059556039 abstract "Abstract Radioimmunoassay (RIA) of whole body extracts of Drosophila melanogaster males and females demonstrates that at eclosion all individuals contain high levels of ecdysteroid. Highly polar ecdysteroids (presumably metabolites) in the meconium represent approximately half of the total ecdysteroid RIA-activity present at this time and are subsequently eliminated. Ecdysteroids remaining after the elimination of the meconium are also highly polar as shown by reverse-phase high pressure liquid chromatography (RP-HPLC). The amount of ecdysteroid RIA-activity found in whole body extracts declines in both sexes until 18 h post-eclosion when levels begin to increase in the female and drop to undetectable levels in the male. In the female the ovaries are the major source of ecdysteroid. The increase in whole body ecdysteroid in the female coincides with the initiation of ovarian ecdysteroid production and accumulation. Topical application of methoprene, a juvenile hormone (JH) analog, stimulates ovarian ecdysteroid synthesis in apterous-ts 78j (ap ts 78j ) , a temperature-sensitive juvenile hormone-deficient mutant, corroborating previous results suggesting a role of juvenile hormone in ovarian ecdysteroid production. Stage 8–9 follicles, whose development is juvenile hormone dependent, are shown to be the most active in ecdysteroid production. The regulatory potential of these stages is discussed." @default.
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- W2059556039 date "1989-01-01" @default.
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- W2059556039 title "Ecdysteroid fluctuations in adult Drosophila melanogaster caused by elimination of pupal reserves and synthesis by early vitellogenic ovarian follicles" @default.
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- W2059556039 doi "https://doi.org/10.1016/0020-1790(89)90068-1" @default.
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