Results 131 to 140 of about 1,154 (175)
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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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Peptidomics of the locust corpora allata: identification of novel pyrokinins (-FXPRLamides)
Peptides, 2003The peptidomes of the corpora allata of Locusta migratoria and Schistocerca gregaria were investigated by both matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and nanoscale liquid chromatography quadrupole time-of-flight tandem mass spectrometry (nanoLC-Q-TOF MSMS). The pyrokinin (-FXPRLamide) family seems to
E, Clynen +5 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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Changes in the sensitivity of adult cockroach corpora allata to a brain allatostatin
Molecular and Cellular Endocrinology, 1990There are major changes in the sensitivity of corpora allata from the cockroach Diploptera punctata toward the allatostatic tridecapeptide APSGAQRLYGFGL-amide (ASAL) during the female reproductive cycle, as revealed by measurement of juvenile hormone (JH) biosynthesis in vitro. Glands from recently molted adult females show only 30-40% inhibition at 10
G E, Pratt +2 more
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Egg maturation in mosquitoes not regulated by the corpora allata
Journal of Insect Physiology, 1969Abstract Implantation of extra corpora allata from either autogenous or anautogenous donors did not stimulate egg maturation in anautogenous Aedes aegypti or Culex pipiens pipiens fed only on sugar, contrary to the report of Larsen. Implantation of a cockroach corpus allatum did not induce egg maturation in anautogenous mosquitoes fed on sugar ...
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INTERENDOCRINE REGULATION OF THE CORPORA ALLATA AND PROTHORACIC GLANDS OF MANDUCA SEXTA
Insect Biochemistry, 1986Abstract Regulation of the haemolymph titres of ecdysteroids and the juvenile hormones (JH) during larval-pupal development of the tobacco hornworm, Manduca sexta , involves the interendocrine control of the synthesis of each hormone by the other. Temporal relationships between the ecdysteroid titre peaks in the fourth and early fifth larval instar ...
R.D. Watson +3 more
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Peptidergic Control of the Corpus Cardiacum-Corpora Allata Complex of Locusts
1998The brain-corpora cardiaca-corpora allata complex of insects is the physiological equivalent of the brain-hypophysis axis of vertebrates. In locusts there is only one corpus cardiacum as a result of fusion, while most other insect species have a pair of such glands.
D, Veelaert, L, Schoofs, A, De Loof
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Ultrastructural characteristics of insect corpora allata in relation to larval diapause
Cell and Tissue Research, 1979The ultrastructure of active and inactive corpora allata from last instar larvae of the southwestern corn borer, Diatraea grandiosella, was examined. Active glands were obtained from pre-, early, and mid-diapausing larvae; inactive ones from late and non-diapausing larvae.
C M, Yin, G M, Chippendale
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Activation of Manduca sexta corpora allata in vitro by a cerebral neuropeptide
Molecular and Cellular Endocrinology, 1984When an in vitro assay system and radioimmunoassays specific for juvenile hormones (JH) I and III were used to probe the effect of co-incubating pupal brains with last instar larval corpora allata (CA) from the tobacco hornworm, Manduca sexta, a selective activation of JH III synthesis by the CA was observed.
N A, Granger +3 more
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Induction of egg diapause by implantation of corpora cardiaca and corpora allata in Bombyx mori
Journal of Insect Physiology, 1976Abstract Diapause egg production was examined in non-diapause egg producers by implantation of various cephalic organs into pharate adults 4 days after larval-pupal ecdysis. The implantation of five pairs of corpora cardiaca or corpora allata induced a great amount of egg diapause.
Satoshi Takeda, Nobuo Ogura
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