Results 121 to 130 of about 1,135 (171)
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Characterization of lepidopteran prenyltransferase in Manduca sexta corpora allata
Archives of Insect Biochemistry and Physiology, 1996An in vitro assay has been developed for determining prenyltransferase activity in larval corpora allata homogenates of the lepidopteran Manduca sexta. Optimal activity was obtained by the addition of glycerol and bovine serum albumin. The prenyltransferase required either Mg2+ or Mn2+ for activity and was inhibited by N-ethylmaleimide, geranylgeranyl ...
Stephanie E. Sen +2 more
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Homology of insect corpora allata and vertebrate adenohypophysis?
Arthropod Structure & Development, 2012Animal species of various phyla possess neuroendocrine glands whose hormonal products regulate developmental and physiological mechanisms and directly impact behavior. Two examples, the corpora allata of insects and the vertebrate adenohypophysis have previously been regarded as analogous tissues that evolved independently from diffuse epidermal nerve ...
Andrea, Wirmer +2 more
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Photoaffinity labeling of methyl farnesoate epoxidase in cockroach corpora allata
Insect Biochemistry and Molecular Biology, 1995The last enzyme in the biosynthetic pathway to juvenile hormone III in the corpora allata of hemimetabolous insects is methyl farnesoate epoxidase, a cytochrome P450 monooxygenase. Assays with intact glands incubated in vitro and with gland homogenates have identified a series of 1,5-disubstituted imidazoles as potent inhibitors of the enzyme.
J F, Andersen +5 more
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Ultrastructural localization of juvenile hormone biosynthesis by insect corpora allata
Cell and Tissue Research, 1977The conversion of exogenous 3H-farnesenic acid to 3H-methyl farnesoate and 3H-C16 juvenile hormone (JH) has been followed in the corpus allatum (CA) cells of the desert locust Schistocerca gregaria by means of electron microscopic autoradiography. Aerobic and anaerobic 'chase' incubations have been used to modify the quantities of these three compounds
S S, Tobe, A S, Saleuddin
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Improved conditions for culture of biosynthetically active cockroach corpora allata
In Vitro Cellular & Developmental Biology - Animal, 1997Currently, short-term culture of insect corpora allata is most often performed in TC199. We now show that L-15B, a medium widely used in arthropod tissue culture, is superior to TC199 for both short- and long-term culture of cockroach corpora allata. In 3-h and 48-h incubations, juvenile hormone biosynthesis by corpora allata from Diploptera punctata ...
G L, Holbrook, A S, Chiang, C, Schal
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The Release of Isoprenoids by Locust Corpora Allata in vitro
Journal of Insect Physiology, 1998Corpora allata of the African locust Locusta migratoria, incubated in vitro, biosynthesized together with juvenile hormone III (JH-III), several molecules labelled by both [2-(14)C] sodium acetate and L-[methyl-(3)H] methionine. By a combination of chromatographic procedures including reverse phase-high-performance liquid chromatography (HPLC), normal ...
F, Couillaud, F, Rossignol, E, Darrouzet
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Duality in function in corpora allata of honeybee larvae
Canadian Journal of Zoology, 1972Corpora allata of honeybee worker larvae 48 h of age are capable of activating Periplaneta female accessory glands. Corpora allata from queen larvae of the same age are repressive in action. By 72 h of age the worker allata have a considerably reduced activity but queen larvae of the same age have allata of the activating type.
S. E. Dixon, E. Moser
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1979
Publisher Summary This chapter discusses the corpora allata of insects. Insect corpora allata or corps allates are endocrine glands which were previously called “paired posterior visceral ganglia,” “ganglia allata,” or “corpora incertae,” owing to their being confused with the sympathetic cerebral structures constituting the stomatogastric system ...
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Publisher Summary This chapter discusses the corpora allata of insects. Insect corpora allata or corps allates are endocrine glands which were previously called “paired posterior visceral ganglia,” “ganglia allata,” or “corpora incertae,” owing to their being confused with the sympathetic cerebral structures constituting the stomatogastric system ...
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Octopaminergic control of corpora allata activity in an insect
Experientia, 1988Octopamine enhanced the release of JH3 from isolated corpora allata of locusts in short-term cultures. This effect was suppressed when phentolamine (inhibitor of the octopamine receptors) was added to the culture medium. Moreover an octopamine-sensitive adenylate cyclase was found in the corpora allata.
M. Lafon-Cazal, J. C. Baehr
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Nervous inhibition of corpora allata by photoperiod in Pyrrhocoris apterus
Nature, 1976PHOTOPERIOD governs reproduction in many insect species with adult diapause. The nervous and neuroendocrine systems mediate the impact of the environment on ovarian functions. It has been suggested that the daylengths promoting diapause prevent secretion of the activation hormone (most probably a complex of neurohormones) from the pars intercerebralis (
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