Results 121 to 130 of about 1,154 (175)
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Regulation of larval corpora allata in Galleria mellonella
Nature, 1974IN insects metamorphosis occurs when the corpora allata stop secreting juvenile hormone, but it is not known how the production of juvenile hormone is regulated. Wigglesworth1 first indicated that the nervous connections from the brain to the corpora allata provide a mechanism for control; this control could be nervous or neurohormonal.
N A, Granger, F, Sehnal
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In vitro growth of corpora allata fromDiploptera punctata
In Vitro Cellular & Developmental Biology - Animal, 1995An in vitro organ culture system was established to support growth of corpora allata from the cockroach Diploptera punctata. During a 1-wk incubation in L-15B medium supplemented with 10% fetal bovine serum (FBS) and 10% cockroach hemolymph, adult male corpora allata exhibited a cycle of de novo DNA synthesis followed by cell division.
W H, Tsai +3 more
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Neuropepride Regulators of Insect Corpora Allata
American Zoologist, 1993SYNOPSIS. Neuropeptides of the insect brain that regulate juvenile hormone synthesis by the corpora allata include allatotropins, stimulatory modulators, and allatostatins, inhibitory modulators. A radiochemical assay for juvenile hormone synthesis by corpora allata in vitro was utilized in the high pressure liquid chromatographic isolation of brain ...
BARBARA STAY, ANDREA P. WOODHEAD
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Prenyltransferase of larval and adult M. sexta corpora allata
Insect Biochemistry and Molecular Biology, 2007Prenyltransferase activity derived from the corpora allata (CA) of the lepidopteran insect, Manduca sexta, has been characterized. The coupling of allylic substrates DMAPP and GPP with the non-allylic substrate IPP was evaluated using CA homogenates of both the larval and adult stages of development.
Stephanie E, Sen +3 more
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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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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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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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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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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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