Ecdysteroid
Mostrando 1-12 de 48 artigos, teses e dissertações.
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1. Compared activity of agonist molecules towards ecdysone receptor in insect cell-based screening system
RESUMO: O receptor de ecdisona, naturalmente ativado por hormônios esteroidais, é uma proteína-chave nos processos de muda e reprodução de insetos. A ativação artificial desse receptor por meio de pesticidas específicos induz um processo de ecdise anômala, levando o inseto à morte por dessecação e inanição. Neste trabalho, foi estabelecido um p
Arq. Inst. Biol.. Publicado em: 25/11/2019
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2. Expression profile of a Laccase2 encoding gene during the metamorphic molt in Apis mellifera (Hymenoptera,Apidae)
Expression profile of a Laccase2 encoding gene during the metamorphic molt in Apis mellifera (Hymenoptera, Apidae). Metamorphosis in holometabolous insects occurs through two subsequent molting cycles: pupation (metamorphic molt) and adult differentiation (imaginal molt). The imaginal molt in Apis mellifera L. was recently investigated in both histological a
Rev. Bras. entomol.. Publicado em: 31/05/2013
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3. Genes cuticulares diferencialmente expressos durante eventos da metamorfose de Apis mellifera / Microarray analysis of genes expressed in the context of Apis mellifera metamorphosis
A cutícula dos insetos é composta principalmente por uma variedade de proteínas que interagem com filamentos de quitina, um polímero de N-acetilglicosamina, para formar um envoltório rígido que protege e dá forma ao organismo. O crescimento dos insetos depende da renovação periódica da cutícula, que se desprende durante a apólise e é digerida en
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2012
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4. Level and distribution of 20-hydroxyecdysone during Pfaffia glomerata development
The ecdysteroid 20-hydroxyecdysone (20E) is a steroid hormone found in insects and few plants. To analyze its temporal and spatial distribution in Pfaffia glomerata (Amaranthaceae), we selected among 71 accessions, the accession 13 which showed the highest root 20E total quantity (1.48 g/plant root). The 20E was constantly detected in flowers, leaves, stems,
Brazilian Journal of Plant Physiology. Publicado em: 2008-12
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5. Efeitos patológicos nos túbulos de Malpighi de Anticarsia gemmatalis causados pela infecção por recombinantes do baculovírus Anticarsia gemmatalis multiple nucleopolyhedrovirus (AgMNPV)
Os túbulos de Malpighi constituem o principal órgão excretor de insetos. Suas funções vão além da excreção, podendo participar da desintoxicação e resposta imune do inseto. A infecção por baculovírus com deleção em seu gene egt em larvas de lepidópteros promove uma degeneração precoce dos túbulos, com conseqüente melhor atividade do bacu
Publicado em: 2007
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6. Estudo farmacognÃstico e determinaÃÃo da atividade biolÃgica de Vitex gardneriana Schauer (Verbenaceae)
Vitex gardneriana Schauer - Verbenaceae is a shrub encountered in the Brazilian northeastâs ecosystem âcaatingaâ. It is popularly called âjaramataiaâ, âjeremataiaâ, âgirimatoâ, âtamancaâ or âtamanqueiraâ. In the folk medicine, the leaves of V. gardneriana are used as sedative and anti-inflammatory. This work describes pharmacobotanical, phytoche
Publicado em: 2004
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7. Insect juvenile hormone: from "status quo" to high society
Juvenile hormone (JH) exerts pleiotropic functions during insect life cycles. The regulation of JH biosynthesis by neuropeptides and biogenic amines, as well as the transport of JH by specific binding proteins is now well understood. In contrast, comprehending its mode of action on target organs is still hampered by the difficulties in isolating specific rec
Brazilian Journal of Medical and Biological Research. Publicado em: 2000-02
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8. Ecdysteroid 7,9(11)-dien-6-ones as potential photoaffinity labels for ecdysteroid binding proteins
Three ecdysteroid 7,9(11)-dien-7-ones (dacryhainansterone, 25-hydroxydacryhainansterone and kaladasterone) were prepared by dehydration of the corresponding 11a-hydroxy ecdysteroids (ajugasterone C, turkesterone and muristerone A, respectively). The biological activities of the dienones in the Drosophila melanogaster BII cell bioassay, which reflect the affi
University of Arizona Library.
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9. Ecdysteroid biosynthesis and embryonic development are disturbed in insects (Locusta migratoria) reared on plant diet (Triticum sativum) with a selectively modified sterol profile
Wheat seedlings germinating in the presence of the systemic fungicide fenpropimorph accumulate 9β,19-cyclopropylsterols (95% of total sterols) in place of Δ5-sterols, which are normally produced in these plants. Adult females of the phytophagous insect Locusta migratoria show a dramatic decrease in their cholesterol content when reared on fenpropimorph-tre
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10. Synthesis and biological activities of turkesterone 11α-acyl derivatives
Turkesterone is a phytoecdysteroid possessing an 11α-hydroxyl group. It is an analogue of the insect steroid hormone 20-hydroxyecdysone. Previous ecdysteroid QSAR and molecular modelling studies predicted that the cavity of the ligand binding domain of the ecdysteroid receptor would possess space in the vicinity of C-11/C-12 of the ecdysteroid. We report th
University of Arizona Library.
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11. Puffing activities and binding of ecdysteroid to polytene chromosomes of Drosophila melanogaster.
Salivary glands of third instar Drosophila melanogaster larvae were incubated in vitro in the presence of 5 x 10(-6) M 20-hydroxy-ecdysone. Steroid hormone was localized on the polytene chromosomes of the salivary gland by a combination of photoaffinity-labeling and indirect immunofluorescence microscopy. Steroid hormone binding to chromosomal loci and their
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12. Developmental Arrest and Ecdysteroid Deficiency Resulting from Mutations at the Dre4 Locus of Drosophila
Loss-of-function mutations of the dre4 gene of Drosophila melanogaster caused stage-specific developmental arrest, the stages of arrest coinciding with periods of ecdysteroid (molting hormone) regulated development. Nonconditional mutations resulted in the arrest of larval development in the first instar; embryogenesis was not impaired, and mutant larvae wer