Corpora Allata
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Histological survey of protocerebral areas and retrocerebral complex of Melipona quadrifasciata anthidioides workers (Hymenoptera, Apidae, Meliponini) / Mapeamento histológico das áreas protocerebrais e do complexo retrocerebral de operárias de Melipona quadrifasciata anthidioides (Hymenoptera, Apidae, Meliponini)
The stingless bees colony comprises a queen, workers of diferent ages that perform different tasks and males only present before the queen´s fecundation. Among the workers, only the oldest ones foragers keep a direct contact with the light/dark environmental cycle. Biological rhythms are present and are generated by the circadian system located in the centr
Publicado em: 2009
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2. Biologia molecular de genes envolvidos no metabolismo do hormônio juvenil em Apis mellifera / Molecular biology of genes involved in Apis mellifera Juvenile Hormone metabolism
O Hormônio Juvenil (HJ) é um sesquiterpenóide que participa de diversas funções do ciclo de vida de insetos. Em Apis mellifera o HJ está envolvido também com o processo de diferenciação de castas e polietismo etário. Neste trabalho, genes participantes da degradação e das vias de síntese do HJ nos corpora allata (CA) foram identificados a partir
Publicado em: 2008
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3. Fator foxo e sinalização nutricional na reprodução de Blatella germânica
CAPITULO II: A barata Blattella germanica é um clássico modelo de estudo de vitelogeneses dependente HJ os experimentos realizados com este inseto confirmam que é um inseto anautogenico, sendo que se este não come não se desenvolve seus oocitos Esse animal possui um período de 8 dias como adulto no qual ocorrem transformações reprodutivas, como cresc
Publicado em: 2008
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4. Expressão de genes das vias de biossíntese e degradação do hormônio juvenil e caracterização de peptídeos ligantes ao cérebro de Melipona scutellaris (Hymenoptera, Apidae, Meliponini)
Abelhas do gênero Melipona têm importante papel na polinização de plantas no Brasil, e por apresentar mecanismo peculiar de determinação de casta genético alimentar pode ser considerada um laboratório vivo para pesquisas de natureza molecular. O Hormônio Juvenil (HJ) é o principal hormônio que regula a diferenciação de casta e o polietismo etár
Publicado em: 2006
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5. The effect of ovary implants on juvenile hormone production by corpora allata of male Diploptera punctata
In the cockroach Diploptera punctata, vitellogenic basal oocytes stimulate juvenile hormone production by the corpora allata. Experiments with males were designed to determine whether oocytes must grow vitellogenically in order to stimulate juvenile hormone production. Two ovarioles with vitellogenic basal oocytes were implanted into unoperated and sham-oper
University of Arizona Library.
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6. Identification of an allatostatin from the tobacco hornworm Manduca sexta.
A peptide (Manduca sexta allatostatin) that strongly inhibits juvenile hormone biosynthesis in vitro by the corpora allata from fifth-stadium larvae and adult females has been purified from extracts of heads of pharate adult M. sexta by a nine-step purification procedure. The primary structure of this 15-residue peptide has been determined: pGlu-Val-Arg-Phe-
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7. Primary structure of four allatostatins: neuropeptide inhibitors of juvenile hormone synthesis.
Four neuropeptides that inhibit juvenile hormone synthesis by the corpora allata have been isolated from brains of the virgin female cockroach Diploptera punctata. These allatostatins are 8-13 amino acids long, are amidated, and show sequence similarity, including a 3-amino acid sequence at the C-terminal end that is common to all four peptides. The peptide
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8. Cellular localization of the insect prothoracicotropic hormone: In vitro assay of a single neurosecretory cell
The distribution of prothoracicotropic hormone in the pupal brain of Manduca sexta has been determined by an in vitro assay for prothoracic gland activation. Prothoracicotropic activity was observed in both the brain and retrocerebral complex, but predominantly in the dorosolateral regions of the protocerebrum. Of the two groups of neurosecretory cells prese
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9. Sex Determination in Bees. IV. Genetic Control of Juvenile Hormone Production in MELIPONA QUADRIFASCIATA (Apidae)
Cell number and volume of corpora allata was determined for 8 phases of development, the first prepupal stage to adults 30 days old, in the social Apidae Melipona quadrifasciata. In the second prepupal stage a strong correlation was found between cell number and body weight ( r=0.651**), and cell number and corpora allata volume in prepupal stage (r=0.535*),
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10. Spontaneous and evoked release of prothoracicotropin from multiple neurohemal organs of the tobacco hornworm
Release of neurohormone from putative cephalic neurohemal organs was directly demonstrated in an insect. The prothoracicotropic hormone (PTTH) of the tobacco hornworm, Manduca sexta, was measured indirectly by its ability to stimulate the secretion of α-ecdysone by inactive prothoracic glands; the ecdysone was measured by radioimmunoassay. The PTTH released
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11. Insect NMDA receptors mediate juvenile hormone biosynthesis
In vertebrates, the N-methyl-d-aspartate subtype of glutamate receptors (NMDAR) appears to play a role in neuronal development, synaptic plasticity, memory formation, and pituitary activity. However, functional NMDAR have not yet been characterized in insects. We have now demonstrated immunohistochemically glutamatergic nerve terminals in the corpora a
The National Academy of Sciences.
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12. Sources of propionate for the biogenesis of ethyl-branched insect juvenile hormones: Role of isoleucine and valine
Corpora allata from adult female Manduca sexta biosynthesize the sesquiterpenoid juvenile hormone (JH) III and the unusual ethyl-branched homologue JH II in vitro. We maintained corpora allata in medium 199 using [methyl-3H]methionine as the source of the JH methyl ester moiety and as a mass marker. This allowed measurement of the relative contributions of 1