Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"ecdysone"”.
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A Role for the Ecdysone Response Gene E93 in Imaginaling Patterning during Metamorphosis
Drosophila melanogaster E93 is an early ecdysone response gene that encodes a pipsqueak domain transcription factor. E93 is induced by ecdysone at the end of larval development, and directs the death and elimination of several larval tissues during metamorphosis. Although E93 has been considered a …
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Identification of a novel autonomous role for Ecdysone Receptor during Drosophila ovarian germ cell differentiation
… to produce viable oocytes. The steroid hormone, ecdysone, is known to promote GSC self-renewal; however, due to lack of compatible genetic tools, potential autonomous roles in the germline have not been fully evaluated. Ecdysone elicits a diverse array of transcriptional responses by binding to a …
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Investigating the coordination of germline stem cell fate by ecdysone signaling and BMP signaling in the Drosophila ovary
… understand how signal convergence is achieved. Ecdysone signaling and Bone Morphogenetic Protein (BMP) signaling are well-known signals that promote GSC self-renewal. Over-expression of Ecdysone Receptor (EcR), knock-down of bag of marbles (bam), or over-expression of constitutively active …
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Activin signaling promotes the competence of the prothoracic gland during Drosophila metamorphosis
… by a large titer of the steroid hormone ecdysone produced by the prothoracic gland. However, the molecular mechanisms that control production of the ecdysone titer are not completely understood. Here we show that blocking Activin signaling in Drosophila prothoracic gland causes …
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Evidence for the Role of Ecdysteroids in the Genital Sex Pheromone of Two species of Hard Ticks, <i>Dermacentor variabilis</i> (Say) and <i>Dermacentor andersoni</i> Stiles
… techniques.</p> <p>Ecdysteroids, specifically ecdysone and 20-OH-ecdysone were shown to be present in the anterior reproductive tracts in excess of amounts that could be explained by mere hemolymph contamination. Ecdysteroids were also found in washings of the vaginal lumen of these two …
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Mapping And Characterization Of 18-5 And 12-5, Genes Which Potentially Link The Rhoa Signaling Pathway To The Ecdysone Response
… regulated both by the steroid hormone 20-hydroxyecdysone (ecdysone) and the RhoA GTPase signaling pathway. Recent evidence suggests that these pathways act cooperatively to control imaginal disc morphogenesis. Thus, leg imaginal disc morphogenesis is an excellent system in which to study the …
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Molecular Study of Diapause via Generation of Two CDNA Libraries and Partial Cloning of the Ecdysone Receptor in <em>Sarcophaga crassipalpis</em>.
… regulation of the steroid hormone 20-hydroxyecdysone (20-HE). Because the metamorphic system is suspended for diapause in this species, whether or not the EcR is expressed in the diapause state is of interest. To address this issue, a partial EcR was cloned from <em>S. crassipalpis</em> by …
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Nurture is Nature: The Molecular Basis of Caregiver Genotype Effects on Larval Growth and Caste Development in the Clonal Raider Ant
… included neuropeptide genes known to regulate ecdysone synthesis in the prothoracic gland of other insects, including <em>corazonin, prothoracicotropic hormone, pheromone biosynthesis activating neuropeptide, </em>and<em> shadow</em>, which encodes an enzyme in the ecdysone biosynthesis …
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Histone modification during the induction of tyrosine transaminase
… level. Injection of the insect moulting hormone, ecdysone, into last instar larvae of Chironomus tentans results in puff formation at specific loci of the chromosomes shortly after hormone administration. Since puffs are local and reversible alterations of the chromosome, formed at sites which are …
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Drosophila Ovarian Stem Cell Establishment is Regulated by Nuclear Hormone Receptor ftz-f1
… Drosophila melanogaster steroid hormone ecdysone regulates germline stem cell (GSC) proliferation and self-renewal, as well as oogenesis and metamorphosis. Though many genes, including nuclear hormone receptor ftz transcription factor 1 (ftz-f1), are thought to be targets of ecdysone …
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Measuring juvenile hormone and ecdysteroid titers in insect haemolymph simultaneously by LC-MS: The basis for determining the effectiveness of plant-derived alkaloids as insect growth regulators
… JH titers were low and steady until day 6. The ecdysone peak maximum shifted from day 3 to a 20-hydroxyecdysone maximum peak on day 5, coinciding with the onset of adult ecdysis. JH III titers increased on day 3 in paired Gryllus bimaculatus males, occurring simultaneously with spermatophore …
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Requirement of Baboon/dsmad2-Mediated Tgf-Beta/activin Signaling for Post-Mitotic Neuronal Development in the Drosophila Brain
… developmental processes prior to the prepupal ecdysone peak. Interestingly, this stage-specific Babo/dSmad2 signaling appears to accelerate maturation and morphogenesis of post-mitotic neurons throughout the entire nervous system. Loss of Babo/dSmad2 drastically delays adult-specific neurons' …
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Endocrine control of fat body composition and effects of the insect growth regulators methoprene and pyriproxyfen on the development and reproduction of the Argentinian cockroach, Blaptica dubia Serville (Blattaria: Blaberidae)
… juvenile hormone (JH) III and free ecdysteroids (ecdysone, 20-hydroxyecdysone) were measured in the haemolymph of adult females by the use of HPLC-mass spectrometry. The JH III titer shows significant peaks during vitellogenesis and ovarian growth, and towards the end of the period of gestation. …
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Breaking the MF curse: the regulatory role of the Methyl farnesoate – MEKRE93 pathway in crustacean molting
… between the steroid hormone 20-hydroxyecdysone (20-E) and the sesquiterpenoid juvenile hormone (JH) control insect molting and development, respectively. On the other hand, crustacean molting is primarily regulated through the endocrine crosstalk between 20-E and the neuropeptide …
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Developmental Characterization of Cara Mitad: A Drosophila Nuclear Receptor Co-Regulator
… fluctuating titers of the steroid hormone ecdysone are responsible for coordinating the timing of organismal development. Despite major advances in our understanding of Drosophila NR activities, we lack essential knowledge of the coregulators that are required for their proper …
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Diminution de la concentration des ecdysones circulant après la mue de puberté chez Chionoecetes opilio
… les organes Y, sites primaires de production des ecdysones, hormones de mue, deviennent soit atrophiés ou inhibés par d'autres hormones. Par conséquent, la concentration des ecdysones circulant dans l'hémolymphe diminue de façon marquée. Cette condition caractérise la mue terminale. La maturité …
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Factors regulating signal composition and task allocation in colonies of the ant Myrmicaria eumenoides
… high relative concentration. 4) The levels of ecdysone and 20-hydroxyecdysone (found to be the main free ecdysteroids in workers), as well as the sum of the total free ecdysteroids in workers, are only high after eclosion, and then fall to a low, steady level within two weeks. Thus no …
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Interpreting Notch signals: characterisation of dynamic transcription hubs by live imaging
… with a second signal; the steroid hormone Ecdysone, whose receptor is known to interact with the Notch-regulated locus. This correlated with the increased recruitment of Pol II and Med1 leading to the hypothesis that the second signal increased the valency of interactions at target …
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Contribución al manejo integrado de ácaros tetraníquidos (Acari: Tetranychidae) que afectan a frutales de clima templado
… of chitin synthesis, flufenoxuron, and the ecdysone antagonist, azadirachtin) has been deeply analysed in this work. On the other hand, the compatibility of both compounds and the entomopathogenic fungus Beauveria bassiana has also been researched. Flufenoxuron showed an important acaricidal …
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Das Ecdysonsystem zur induzierbaren Genexpression in Herzen von transgenen Mäusen
Zusammenfassung Systeme zur induzierbaren Transgenexpression sind wichtige Werkzeuge, um die Funktion einzelner Gene in vitro und in vivo zu untersuchen. Sie bestehen aus drei Grundkomponenten, einem zu regulierenden Zielgen, einem "Schalter" und einem Liganden, der diesen Schalter bedient. In …
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