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 137 for “"gametes"”.
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Evolution of Male Gametes in Liverworts
Liverworts are speciose, morphologically diverse, and members of an ancient lineage that is now recognized as the sister group to all other land plants. Spermatozoid ultrastructural characters have provided insight on interrelationships among plant groups as well as the puzzling placement of some …
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Xenogenous Intrafallopian Transfer of Horse (Equus caballus) Gametes
… (UTJ) at the time of XGIFT, or the duration gametes were allowed to reside in the uterine tube, did not affect the recovery and cleavage rate. However, the most advanced stage embryos were recovered from ewes ovulating shortly after XGIFT. Fertilization following XGIFT was further …
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In Vitro Maturation, Fertilization and Embryo Culture of Porcine Gametes in a Microfluidic Environment
These experiments were designed to examine the effects of in vitro fertilization within the microchannel environment and to compare the results to the traditional microdrop culture system. Additionally, the initial experiments of integrating the steps of the IVP process within a single microchannel …
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THE SPECIAL WALLS AROUND GAMETES IN CERATOPTERIS RICHARDII AND AULACOMNIUM PALUSTRE: USING IMMUNOCYTOCHEMISTRY TO EXPOSE STRUCTURE, FUNCTION, AND DEVELOPMENT
… Carbondale. TITLE: THE SPECIAL WALLS AROUND GAMETES IN CERATOPTERIS RICHARDII AND AULACOMNIUM PALUSTRE: USING IMMUNOCYTOCHEMISTRY TO EXPOSE STRUCTURE, FUNCTION, AND DEVELOPMENT MAJOR PROFESSOR: Dr. Karen S. Renzaglia Gametes are arguably the most important cells formed during the sexual life …
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Steps towards successful cryopreservation of fish gametes: improving laboratory protocols in the Zebrafish model to increase gamete viability and efficiency
… from endangered species. While mammalian gametes have long been freezable, eggs and embryos from fish have yet to be successfully frozen. Furthermore, protocols for freezing fish sperm have low success rates. In an effort to overcome the limitations in gamete manipulation currently …
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Multi-Step Trafficking Pathway for Regulation of the Protein Composition of the Chlamydomonas Flagellar Membrane during Cilium-Generated Signaling
… mating type plus and mating type minus gametes undergo flagellar adhesion through the interaction of flagellar adhesion receptor activities (flagellar agglutinins) encoded by the SAG1 (plus gametes and SAD1 (minus gametes) genes, activating a cAMP-dependent signaling pathway that …
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The Protein Composition of the Chlamydomonas Flagellar Membrane Is Dynamically Regulated by Cilium-Generated Signaling During Fertilization
… its cognate receptor SAD1 on flagella of minus gametes induces flagellar adhesion and activation of a cAMP-dependent signaling pathway ultimately leading to cell-cell fusion. Although previous work from our laboratory and others suggested that pathway activation triggers mobilization of a pool …
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Evaluation of Diet, Gametogenesis, and Hermaphroditism in Freshwater Mussels (Bivalvia: Unionidae)
… not (p>0.17). Production of ripe and developing gametes differed significantly among treatments (p=0.001), but stage of gamete development did not (p=0.70). Lipid levels and muscle fiber areas of treatment groups differed significantly (p<0.0001). Results of the feeding trial indicate that S. …
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Correlations Between Electron Microscopic and Classical Analytic Observations of Three Strains of Temperature-Sensitive Male Sterility Mutants of <em>Drosophila melanogaster</em>.
… the assembly of cellular components into haploid gametes. It is directed, presumably, by the sequential activation and repression of genes.
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Laboratory studies on the spawning and the early life history of Pacific halibut (Hippoglossus stenolepis)
… female fish became mature and produced viable gametes. Low water temperature accelerated final oocyte maturation or triggered ovulation for halibut. First spawning over the past five years has occurred at temperatures below 9°C. The timing of stripping of halibut was critical as the fish have a …
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Possible uses of the developmental embryology of the sea urchin Parechinus angulosus for pollution monitoring in the nearshore marine environment
… stages of development from freshly spawned gametes. through fertilization. pre-hatch development and post-hatch development to 70 - 80 h pluteus larvae were utilized to determine the effect of a variety of pollutants on subsequent development. Different stages in the developmental ontogeny …
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The genomic and genetic basis of mammalian sexual reproduction : sequence of the mouse Y chromosome, and a gene regulatory program for meiotic prophase
… differentiation, and the production of haploid gametes. In this thesis, I examined the genomic evolution of the mouse Y chromosome, which instructs sexual determination, and genetic regulation of a program of gene expression for meiosis, a specialized cell cycle which gives rise to haploid …
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Mechanisms preventing DNA replication between Meiosis I and Meiosis II
… which requires the production of haploid gametes. These gametes are produced by meiosis, a specialized cell division during which one round of DNA replication is followed by two rounds of chromosome segregation, Meiosis I (MI) and Meiosis II (MII). This imbalance between rounds of DNA …
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Involvement of mitochondrial transcription factor A (TFAM) in porcine gametogenesis and preimplantation embryo development
… the expression and distribution of TFAM in the gametes and preimplantation embryos of a domestic pig (Sus scrofa), a livestock species of major economic significance. We hypothesized that TFAM will be expressed at high levels in oocytes and embryos and that sperm mitochondria should be devoid of …
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Cell cycle regulation during gametogenesis in budding yeast
… the specialized cell division that gives rise to gametes. During meiosis, two consecutive rounds of chromosome segregation follow one round of DNA replication to yield four haploid gametes from one diploid progenitor. In meiosis I, homologous chromosomes segregate and in meiosis 11, sister …
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Chromosome malorientation precedes nondisjunction during female meiosis I
… form of cellular division in which the gametes are formed. During female meiosis I, homologous chromosomes must coorient to opposite poles to ensure proper segregation, otherwise nondisjunction can occur which would form aneuploid gametes. The recent discovery that chromosomes do in fact …
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Experimental cultivation of the South African scallop Pecten sulcicostatus
… can be artificially conditioned to produce ripe gametes throughout the year and to investigate the various stages of cultivation, in order to determine whether this species is viable for farming. This thesis therefore describes the reproductive cycle of P. sulcicostatus and also reports on the …
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Stability of 'Thornless Evergreen' Blackberry in Vitro and Ex Vitro (Tissue Culture, Chimera, Variability, Somaclonal Variation, Rubus)
… shoots from roots are always thorny, and gametes carry the thorny gene. Via micropropagation, pure thornless plants were selected from rapidly propagated shoot tips. These pure thornless plants had shortened internodes and a characteristic "bent petiole" condition. Isolated root segments …
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Medical biotechnology law in South Africa : a human rights analysis of selected topics
… namely human embryo research, the use of human gametes, autologous tem cell therapy, and private stem cell banking. In all four cases, my analyses give specific prominence to two research themes: first, human dignity as touchstone of the South African human rights regime, and secondly legal …
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Reproduction And Propagation Of The Neosho Mucket, Lampsilis Rafinesqueana
… for occurrence of eggs or sperm. Observations of gametes in gonad fluid samples indicate that Neosho muckets undergo gametogenesis in the late summer and early fall. This pattern appears consistent with the primitive lampsiline pattern of fall spawning. At Shoal Creek, 90% of females reproduced in …
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