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 30 for “"Chorion"”.
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Stink bug egg studies in southeastern Virginia: parasitoid survey, and susceptibility and chorion permeability to insecticides
… movement into parasitized eggs. Differences in chorion permeability of non-parasitized and parasitized eggs were compared by immersing them in solutions containing different ¹⁴C-ammended insecticides at field application rates for 0, 30, 120 or 240 minutes. Results showed that insecticide …
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A Study of the Sculpture of the Chorion of the Eggs of Eighteen South Dakota Grasshoppers (Acridiidae)
… on page 10 , it can be seen that the pattern of chorion of the eggs is also a study of the morphology of a portion of the ovarian follicle. If we find a different relation between species when studying the evolution of the various reproductive systems than is expended by the characters now used …
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The distribution of different fluorescence dyes in the egg and embryo of the zebrafish (Danio rerio)
… in different compartments of the zebrafish egg (chorion, perivitelline space, different organs of the embryo). For a better assessment of the effects of side chains, rhodamine b and fluorescein were chosen as basic fluorochromes, which were then modified by diverse substituents that differed in …
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The fathead minnow embryo as a model for the development of alternative testing methods in ecotoxicology.
… embryo tests might be due to differences in the chorion. Examinations of the chorion with light, confocal laser scanning and transmission electron microscopy revealed significant differences to the zebrafish chorion. The fathead minnow chorion was thicker and had less and smaller pores on the …
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mRNA-Expression des CRH-Systems in menschlichen schwangerschaftsspezifischen Geweben
… Gewebebank mit Myometrium, Plazenta, Dezidua, Chorion und Amnion von ca. 100 Patientinnen aufgebaut. <br>Zunächst wurden die RT-PCR-Methoden für alle o.g. Komponenten des CRH-Systems etabliert. Untersuchte Einflussgrößen waren dabei die RNA-Qualität, die Primerauswahl und die Austestung …
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Gene amplification in Drosophila ovarian follicle cells as a developmental strategy and model for metazoan DNA replication
… several clusters of genes encoding the eggshell (chorion) proteins in the follicle cells of each egg chamber are overreplicated 20 or 60 fold (for the X chromosome and third chromosome amplicons, respectively). Gene amplification is accomplished using the normal eukaryotic DNA replication …
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Design of <i>In Vivo</i> Assays for Study of Transport, Biocompatibility and Toxicity of Nanoparticles
… discovered their transport patterns through the chorion and into the chorion space of the different stages of embryos. We demonstrated that the different types of Ag NPs caused a wide variety of deformities and caused an increase in death, and both in a concentration dependent manner in living …
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OVERRIPENING OF OVULATED EGGS IN GOLDFISH, CARASSIUS AURATUS L
… and also became bigger due to hydration. The chorion became thinner and surface changes were noted, e.g. the completel withdrawal of the plugs from the pores or the partial recession of the plugs into the pores. The time course of overripening was established based on various parameters. …
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AMNIOTIC MEMBRANE TRANSPLANTATION FOR OCULAR SURFACE RECONSTRUCTION IN VETERINARY MEDICINE
The fetal membrane is composed by the chorion, allantois and amnion. The AM is the inner layer. It consists of a single layer of ectodermally derived cuboidal to columnar cells, which form the epithelium, a basement membrane that connects with the chorion by a layer of mesenchyme which contains …
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ΣΥΓΚΡΙΤΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΧΟΡΙΟΓΕΝΕΣΗΣ ΣΕ ΕΝΤΟΜΑ ΟΙΚΟΝΟΜΙΚΗΣ ΣΗΜΑΣΙΑΣ
THE INSECT EGGSHELL (CHORION AND VITELLITE MEMBRANE) AND THE OVERLAID EPITHELIUM (FOLLICLE CELLS) HAS BEEN EXTENSIVELY USED STRUCTURALLY AND MOLECULARLY AS A MODEL SYSTEM FOR STUDIES ON CELL DIFFERENTIATION. THE MOST THOROUGHLY STUDIED EGGSHELL BELONGS TO THE FRUIT FLY DROSOPHILLA MELANOGASTER …
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Morphological and Physiological Characteristics that Contribute to Insecticide Resistance in Bed Bug (Cimex lectularius L.) Eggs
… using scanning electron microscopy (SEM) and the chorion and respiration structures were identified. Scanning electron microscopy photographs and bed bug egg measurements indicated there were no morphological differences between different bed bug egg strains (susceptible and resistant). Bed bug …
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Paleobiology of the Early Cambrian Yanjiahe Formation in Hubei Province of South China
… phosphatized outer envelope (interpreted as the chorion) that encloses a multicelled blastula-like embryo or a calcitized embryo marked by sets of grooves on its surface. The arrangement of these grooves resembles annulations found on the surface of the Cambrian-Ordovician fossil embryo …
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Understanding Host Tolerance to Transposable Elements
… in DSB repair and also exhibited increased chorion gene expression- an indicator of enhanced DSB repair. By integrating the data from QTL mapping, gene expression as well as in-phase SNP analysis, I identified two strong candidate genes that could influence tolerance: brat and Nipped-A, a …
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The Role of the X-chromosomal Porcupine Homolog Gene in Mouse Development
… that Porcn is required in the extra-embryonic chorion in order to mediate chorio-allantoic fusion, whereas ablation in the extra-embryonic visceral endoderm had no apparent effects. The extra-embryonic requirement for Porcn results in a parent-of-origin effect in Porcn heterozygous females due …
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Blood Vessel Development
… ablation of Arhgap29 in mice led to allantois-chorion fusion and cardiovascular defects during embryonic development. Arhgap29 expression patterns were correlated with the sites of defects, as Arhgap29 transcripts were seen in allantois and cardiovascular tissues. From these results, its …
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Drosophila E2F and DP genes : their role in the regulation of G1-S progression and the activity of DNA replication origins
… replication and activate the amplification of chorion loci. In addition to the positive and negative effects on the activity of replication origins, E2F/DP is necessary for nuclear lamin breakdown in nurse cells and subsequent nurse cell apoptosis.
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Comparação dos aspectos histomorfométricos entre lesões de líquen plano oral e lesões liquenoides orais
… basal layer and involvement of the epithelium-chorion interface and degree of subepithelial inflammatory infiltrate, and morphometric parameters, such as keratin thickness, distance from the basal layer to the epithelial surface, thickness of the band of inflammatory infiltrate and cell …
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A multi-lineage in vitro mouse embryo model derived exclusively from mouse embryonic stem cells
… extraembryonic tissues, including a yolk sac and chorion. Further single-cell RNA sequencing analysis of individual embryoids showed a robust recapitulation of cell states in both embryonic and extraembryonic lineages, with little variation in the overall gene expression programme in these cell …
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The Effects of Toluene on the Ontogenetic Development of the Fish, Oryzias latipes, the Japanese Medaka
… of development (before the hardendening of the chorion), and the later stages of development (prior to hatching) were t he more sensitive periods to the action of the toluene. The 96-hr TL50 values of these groups ranged from 20-30 mg/l toluene. Factors influencing mortalities were: (1) the …
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Cell behaviour during optic vesicle morphogenesis in medaka
… movements that cause them to rotate in the chorion or in the embedding medium. I first established an in vivo imaging set up for medaka that was the basis for the further 4D analysis of eye morphogenesis. This analysis shows that optic vesicle morphogenesis requires the modulation of the …
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