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 1053 for “"embryos"”.
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ULTRARAPID FREEZING OF MOUSE EMBRYOS
… involves a brief exposure (2.5-3 minutes) of embryos to a high concentration (3.0-4.5 M) of dimethyl sulfoxide (DMSO) and 0.25 M of sucrose at room temperature before direct plunging into liquid nitrogen. The objective of this study was to determine the efficacy of this technique for the …
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Telomerase Activity in Human Preimplantation Embryos
… by the use of discard and donated oocytes and embryos for the comparative evaluation of telomerase activity and maturation level. Immature oocytes, mature oocytes, zygotes, 2–3 cell, 4–5 cell, 6–7 cell, 8–16 cell embryos, morulae, and blastocysts were evaluated individually for telomerase …
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Appearance Based Stage Recognition of Drosophila Embryos
… recognition based on the appearances of embryos is becoming a more desirable scheme. This problem, however, is very challenging due to severe variations of illumination and gene expressions. In this research thesis, we propose an appearance based recognition method using orientation …
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Storage of mouse embryos of different genotypes
… to the difference in the percentage survival of embryos after cooling and storage. A total of 2669 eight-cell mouse embryos of different genotypes (ICR, C57BL/6n, ICR x C57 and C57 x ICR) were stored for one day at 4$\sp{\underline\circ}$C or at $-$196$\sp{\underline\circ}$C after vitrification …
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Spatial Transcriptome Profiling of Gastrulating Primate Embryos
… the human embryo. Since postimplantation human embryos cannot be accessed routinely due to ethical and legal restrictions, early postimplantation development has been studied so far using stem cell-based in vitro models or embryo culture systems that provided valuable insights into early embryo …
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Cultivation of Eimeria Dispersa in Bobwhite Quail Embryos
… development of E. dispersa in Bobwhite quail embryos, and to examine the cross-transmission properties of this species for turkeys, chickens, and Japanese quail. Procedure. Oocysts, isolated from fecal samples of adult Bobwhites, were sporulated in an aqueous solution containing 2.5% potassium …
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Zinc Sunscreens Affect Development of Strongylocentrotus purpuratus Embryos
… urchin, <em>Strongylocentrotus purpuratus</em>. Embryos developed in various concentrations of Zn, the sources of which included zinc-containing compounds: ZnO and ZnSO<sub>4</sub>; and ZnO sunscreens: All Good, Badger, and Raw Elements. ZnO sunscreens were slightly more toxic than ZnO and …
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The control of melanogenesis in early avian embryos
The developing neural crest in avian embryos presents a unique system for the investigation of cell migration and differentiation. A variety of histological, cellular and molecular techniques have been used in this study to explore and clarify the exact sequence of events occurring during the …
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A chromosomal analysis of 25-day pig embryos
… to purebred Hampshire boars to produce 25-day embryos for chromosomal analysis. Blood samples were drawn from five of these gilts and one of the boars for leucocyte cultures and a comparison was made between karyotypes prepared from the dam with those prepared from her 25-day embryos. The mean …
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Development of the ocular motor system in mouse embryos
… oculomotor guidance in chick and zebrafish embryos; however, a time course of mammalian development has not been established. This study establishes a time course of the critical stages of oculomotor nerve outgrowth to the periocular area in mice at embryonic day (e) 9.5 - e14.5. In previous …
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Regulation of Mitotic Spindle Assembly in Caenorhabditis elegans Embryos
… outgrowth from centrosomes in rsa-1(RNAi) embryos. TPXL-1 is lost from centrosomes, which may explain why spindle poles collapse in the absence of RSA-1. TPXL-1 physically associates with RSA-1 and RSA-2, suggesting that it is a direct target of PP2A. In summary, this work defines the role …
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Metabolic downregulation during diapause in embryos of Artemia franciscana
Encysted embryos of <i>Artemia franciscana</i> undergo a dramatic respiratory depression upon release from the adult female as they enter a state of hypometabolism termed diapause. The mechanisms by which such a respiratory depression is achieved remain unexplained. Evidence presented here shows …
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Micrurgy and in Vitro Preimplantation Development of Rabbit Embryos
Made available in DSpace on 2014-12-14T15:29:41Z (GMT). No. of bitstreams: 1 7820989.pdf: 3167012 bytes, checksum: cab7a5f928b1087fdaf1d78e04bf8b3d (MD5) Previous issue date: 1978
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Simultaneous visual and electro-cardiogram measurements of zebrafish embryos
… and electrocardiogram measurement of zebrafish embryos. One zebrafish embryo was placed between two electrodes and the electrical signal was amplified 100 times, then a computer recorded the data. The visual reading of the zebrafish heart rate was obtained by viewing the embryo under a …
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Development of Cardiovascular Regulation in Embryos of the Domestic Fowl (Gallus Gallus), with a Partial Comparison to Embryos of the Desert Tortoise (Gopherus Agassizii)
… to the fetal lamb. Developing chicken embryos rely on both alpha and beta adrenergic tones to maintain normal heart rate and arterial blood pressure during incubation. However, on day 21, just prior to hatch, these animals lose both tones on arterial pressure suggesting the onset of …
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IMMUNOLOGICAL CONSEQUENCES RESULTING FROM EXPOSURE OF CHICK EMBRYOS TO ANTIGEN.
… CONSEQUENCES RESULTING FROM EXPOSURE OF CHICK EMBRYOS TO ANTIGEN.
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