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- W2079721440 abstract "Adult mated females of the viviparous cockroach Diploptera punctata are moderately sensitive to precocenes. Oöcyte growth is inhibited and oviposition is delayed in insects topically treated with precocene II or precocene III. C16 juvenile hormone release by corpora allata of precocene-treated insects is markedly inhibited when compared to corpora allata of acetone-treated controls. Electron microscopy of the corpora allata reveals that precocene treatment results in a disorganisation of the intracellular organelles. Topically applied precocene II reaches a high concentration in the haemolymph (0.5 mM 2 hr after topical application of 250 μg). C16 juvenile hormone release by isolated corpora allata is inhibited by precocenes in vitro; half-maximal inhibition over a 3 hr period is obtained at 0.4 mM precocene II. In vitro inhibition of corpora allata by precocene II concentrations higher than 1 mM rapidly destroys the glands as evidenced by electron microscopy (total disintegration of cellular organelles) and by the virtual cessation of C16 juvenile hormone synthesis by the corpora allata. Inhibition of C16 juvenile hormone release by precocene is time-dependent and is not reversible over the short-term incubation in vitro. This inhibition does not appear to be related to the spontaneous activity of the glands in vitro, and it can be reduced by two epoxidase inhibitors. Precocenes are pro-allatocidins in this species: they are bioactivated within the corpora allata to cytotoxic epoxides." @default.
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- W2079721440 date "1981-01-01" @default.
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- W2079721440 title "Precocenes as pro-allatocidins in adult female Diploptera punctata: A functional and ultrastructural study" @default.
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- W2079721440 doi "https://doi.org/10.1016/0022-1910(81)90087-1" @default.
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