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- W1993226720 abstract "Hemolymph ecdysteroid titers in fifth instar larvae of Rhodnius prolixus were determined by radioimmunoassay, and their prothoracic glands were excised and examined by electron microscopy. During the last larval instar, the titer of ecdysteroid increased between the head-critical period until Day 13, at which time the peak titer was 3100 pg 20-hydroxyecdysone equivalents/microliter. The activation of secretory cells at the time of the second period of prothoracicotropic hormone release was correlated with the development of major cellular organelles. The smooth endoplasmic reticulum first appeared at the head-critical period and then proliferated in close relation to the increase in ecdysteroid titer until Day 13, after which time it disappeared. Mitochondria expand and develop tubular cristae. They are closely associated with the smooth endoplasmic reticulum. When insects were decapitated, hemolymph ecdysteroid titer remained below 10 pg/microliter and the prothoracic gland cells failed to develop smooth endoplasmic reticulum. We conclude that in the prothoracic gland cells as well as other steroidogenic tissues the smooth endoplasmic reticulum in association with mitochondria is involved in ecdysone biosynthesis." @default.
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- W1993226720 date "1984-01-01" @default.
- W1993226720 modified "2023-09-27" @default.
- W1993226720 title "Cytophysiological correlations between prothoracic gland activity and hemolymph ecdysteroid concentrations in Rhodnius prolixus during the fifth larval instar: Further studies in normal and decapitated larvae" @default.
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- W1993226720 doi "https://doi.org/10.1016/0016-6480(84)90219-3" @default.
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