Ecdysis
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Ablação ocular no camarão Macrobrachium rosenbergii (De Man) (Crustacea, Decapoda, Palaemonidae): efeitos sobre a reprodução, pigmentação epidérmica e atividade alimentar
This study analyze the consequences of unilateral and bilateral ablation based on ovigerous percentage, consecutive spawns, and secondary effects of the surgical process in the females of Macrobrachium rosenbergii (De Man, 1879). Two experiments were carried out with four and seven months old females in intermolt stage. Each experiment was comprised of contr
Revista Brasileira de Zoologia. Publicado em: 2000-09
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14. Influencias da arquitetura e urbanização de Campinas (SP) na mortalidade das borboletas-da-palmeira (Lepidoptera: Brassolinae)
Pupal mortality of Brassolis sophorae and Opsiphanes invirae was studied across a center-suburbs gradient in the city of Campinas in relation to the site of attachment od the pujpae (interaction, and the use of the soil in regional and local scales. The analysis consisted of the examination of the pupal exuviae, systematically collected at 75 sampling points
Publicado em: 1990
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15. A remarkable, precisely timed release of hyperglycemic hormone from endocrine cells in the gut is associated with ecdysis in the crab Carcinus maenas
Molting or ecdysis is the most fundamentally important process in arthropod life history, because shedding of the exoskeleton is an absolute prerequisite for growth and metamorphosis. Although the hormonal mechanisms driving ecdysis in insects have been studied extensively, nothing is known about these processes in crustaceans. During late premolt and during
The National Academy of Sciences.
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16. Corazonin receptor signaling in ecdysis initiation
Corazonin is a highly conserved neuropeptide hormone of wide-spread occurrence in insects yet is associated with no universally recognized function. After discovery of the corazonin receptor in Drosophila, we identified its ortholog in the moth, Manduca sexta, as a prelude to physiological studies. The corazonin receptor cDNA in M. sexta encodes a protein of
National Academy of Sciences.
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17. Molting, Ecdysis, and Reproduction of Trichinella spiralis Are Supported In Vitro by Intestinal Epithelial Cells
Trichinella spiralis is an obligate parasite of animals that has an unusual intracellular life cycle. Investigation of parasitism at the cellular and molecular levels has been challenging because of a shortage of tools for in vitro cultivation of T. spiralis. We have found that T. spiralis larvae molt, ecdyse, develop to adulthood, and reproduce when they ar
American Society for Microbiology.
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18. Masquerading as self? Endoparasitic Strepsiptera (Insecta) enclose themselves in host-derived epidermal bag
We report here the case of a metazoan parasite, a strepsipteran, that manipulates host epidermal tissue and wraps itself within it; which probably camouflages the endoparasite and is recognized as ``self'' by the host. This mechanism is one of immune avoidance among parasitoid insects. The host-derived epidermal ``bag'' might have enabled Strepsiptera to
National Academy of Sciences.
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19. Isolation and expression of the eclosion hormone gene from the tobacco hornworm, Manduca sexta.
Eclosion hormone (EH) is a 62-amino acid neuropeptide that initiates the ecdysis behavior of insects. The EH-encoding gene of the tobacco hornworm, Manduca sexta, was isolated by using a designed 72-mer oligonucleotide probe. Sequence analysis of this gene and its corresponding cDNA showed that the EH gene is 7.8 kilobases and consists of three exons. Exon I
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20. Bacteria Associated with the Gut Tract of Larval Stages of the Aquatic Cranefly Tipula abdominalis (Diptera; Tipulidae) †
Scanning electron microscopy, light microscopy, and direct isolations were used to examine the distribution and diversity of bacteria in the gut tracts of larval stages of Tipula abdominalis. The animal had an enlarged hindgut which housed a diverse bacterial community in the lumen and directly attached to the gut wall. Distinct localization was noted, with
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21. Identification of G protein-coupled receptors for Drosophila PRXamide peptides, CCAP, corazonin, and AKH supports a theory of ligand-receptor coevolution
G-protein coupled receptors (GPCRs) are ancient, ubiquitous sensors vital to environmental and physiological signaling throughout organismal life. With the publication of the Drosophila genome, numerous “orphan” GPCRs have become available for functional analysis. Here we characterize two groups of GPCRs predicted as receptors for peptides with a C-termi
National Academy of Sciences.
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22. The two duplicated insecticyanin genes, ins-a and ins-b are differentially expressed in the tobacco hornworm, Manduca sexta.
Two gene-specific probes were generated from the unique sequences in the 3' non-coding regions of the two insecticyanin genes, ins-a and ins-b to study the developmental expression of these genes in Manduca sexta. Both genes were initially transcribed in the freshly hatched first instar larvae and then expressed in the epidermis and to a lesser degree in the
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23. Neuroendocrine regulation of corpus allatum activity in Manduca sexta: Sequential neurohormonal and nervous inhibition in the last-instar larva
The inactivation of corpora allata (CA) in the last-instar larva of the tobacco hornworm Manduca sexta was studied using in vivo assay methods that test the capacity of the glands to induce an extra larval molt. Results indicate that the CA are inactivated by a two-step process. In the first step, a neurohormonal inhibition occurs by day 1 after ecdysis, res
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24. Metalloproteases of infective Ancylostoma hookworm larvae and their possible functions in tissue invasion and ecdysis.
To infect their hosts, hookworm larvae must exsheath and migrate through connective tissue. A modified in vitro skin chamber was used to show that the human hookworm Ancylostoma duodenale and the zoonotic canine hookworm Ancylostoma caninum penetrate epidermis, basement membrane, and dermis in similar ways. These similarities in tissue invasion properties re