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 50 for “"gametogenesis"”.
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Cell cycle regulation during gametogenesis in budding yeast
… how cell cycle regulators function during gametogenesis. First, I show that the mitotic exit network, which is a signaling pathway essential for mitotic exit, is dispensable for the meiotic divisions, and in fact signals via a mechanism distinct from mitosis. Second, I present data that the …
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Studies on gametogenesis in the Echiuroid worm, Urechis caupo
<p>During the spring of 1955, while attending classes at the Pacific Marine Station, under the direction of Dr. Alden E. Nobel, Chairman of the Department of Zoology, College of the Pacific, Urechis caupo was introduced as a representative of the fauna of the mud flats of Tomales Bay. The unusual …
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Understanding the molecular mechanisms controlling gametogenesis and virulence in Cryptosporidium parvum
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Evaluation of Diet, Gametogenesis, and Hermaphroditism in Freshwater Mussels (Bivalvia: Unionidae)
… mixed algal diet. To determine sex and stage of gametogenesis, tissue histological sections from gonads of Villosa iris and Utterbackia imbecillis were evaluated. Occurrences of oogenic, spermatogenic, and hermaphroditic tissues were summarized in frequency tables. Visceral sites from which …
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Involvement of mitochondrial transcription factor A (TFAM) in porcine gametogenesis and preimplantation embryo development
… and embryos, and may exert a critical role in gametogenesis and preimplantation embryo development. Sperm TFAM protein could be marked for proteolysis by the ubiquitin-proteasome pathway during spermatid elongation to facilitate the degradation of paternal mitochondria after fertilization.
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Role of GnIH and GnRH in Paracrine Control of Gametogenesis in Zebrafish (Danio rerio)
… the complex multifactorial system that regulates gametogenesis in zebrafish in a paracrine manner.
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An ultrastructural study of gametogenesis and early development in the sea anemone <i>Actinia fragecea</i> (Cnidaria : Anthozoa)
Large Individuals of the sea anemone <i>Actinia fragacea</i> were collected at approximately monthly intervals over a two year period. Their gonads were examined by light and electron microscopy, in order to follow the gametogenic process. The sexes are separate, and both show an annual cycle of …
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Characterization of the Beta-Karyopherin Protein Ipo9 During Germ Cell Differentiation
… The contribution of nuclear trafficking during gametogenesis is not well understood. Here we demonstrated that the well conserved β-karyopherin Importin-9 (Ipo9) is essential in the germline for proper gametogenesis in female and male flies. We generated a molecular null allele of Ipo9 and …
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Using Advanced In Vitro Models to Investigate the Adverse Effects of Methotrexate on the Developing Epigenome
… the use of in vitro models of embryogenesis and gametogenesis to investigate the impact of drug exposure on the developing epigenome. The folate antagonist methotrexate (MTX) was used at lower doses, equivalent to doses for treatment of rheumatoid arthritis, to interrogate the impact of perinatal …
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Mrp4 Is a Crucial Regulator of Testosterone Biosynthesis
… reduced testicular testosterone, impaired gametogenesis, and disrupted cAMP homeostasis, resulting in decreased expression of genes involved in testosterone biosynthesis. Testosterone production was also impaired in adult KO mice but testicular morphology was normal. In vitro culture of …
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Population ecology of the dinoflagellate species Lingulodinium Polyedrum in southern California
… cycle experiments showed that processes such as gametogenesis and ecdysis of L. polyedrum are influenced by photon flux density (PFD) and gave a first indication for an involvement of the photosynthetic apparatus in the induction of gametogenesis in dinoflagellates. The light acclimation …
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An Evaluation of Adult Freshwater Mussels Held in Captivity at the White Sulphur Springs National Fish Hatchery, West Virginia
… by evaluating survival, energy reserves, and gametogenesis of captive mussels in a recirculating pond system. I relocated three mussel species in the summer of 2001 and 10 mussel species in the summer of 2002 to a recirculating pond system (reservoir and raceway) at the hatchery. Water quality …
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A temporal investigation of Europe-wide drivers of cockle Cerastoderma edule biology, health and population dynamics
… techniques and morphometric analysis to examine gametogenesis, health and growth, and the key biotic and abiotic modulators of these characteristics. The evident trends were then considered in the context of future climate change. The variability in cockle populations was affirmed, particularly …
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Reproductive patterns of deep-sea invertebrates related to phylogeny and energy availability
… environmental factors affecting the individuals. Gametogenesis, and particularly vitellogenic pathways, are genetically determined and constrained by phylogeny. As a result, related species have similar patterns in the early processes of gamete production. In contrast, the reproductive output of …
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An Evaluation of the Survival and Growth of Juvenile and Adult Freshwater Mussels at the Aquatic Wildlife Conservation Center (AWCC), Marion, Virginia
… species was also compared to determine whether gametogenesis was occurring in captivity. In summer 2003, the first of two juvenile experiments tested the effects of three rates of water flow (1 L/min, 3 L/min, and 7 L/min) on the survival and growth of V. iris and Epioblasma capsaeformis reared …
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Ciclo reprodutivo de Echinaster (Othilia) brasiliensis Müller & Troschel, 1842 (Echinodermata: Asteroidea) na região do Cabo Frio, RJ
… analysis of gonads showed asynchrony in gametogenesis among the individuals of this population. Small and mesovitellogenic oocytes (60-160μm) were the dominant size-class in all samples. Several size classes of oocytes were found together in may ovaries along the studied period. No spent …
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THE SPECIAL WALLS AROUND GAMETES IN CERATOPTERIS RICHARDII AND AULACOMNIUM PALUSTRE: USING IMMUNOCYTOCHEMISTRY TO EXPOSE STRUCTURE, FUNCTION, AND DEVELOPMENT
… wall polymer distribution during male and female gametogenesis in the model fern, Ceratopteris richardi, and for comparison with both Ceratopteris and seed plants, I examined the same cell wall polymers during spermatogenesis in Aulacomnium palustre, a moss species. AGPs are abundant in the …
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Seasonal gonadal changes in two bivalve mollusks in Tomales Bay, California
… Bay, is described below.</p><p>The study of gametogenesis in O. edulis in Tomales Bay is desired to evaluate the reproductive adaptation of this animal to a new set of ecological conditions. The inclusion of the native P. cepio in this study allows comparison of the gonadal development of …
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Oocyte differentiation is genetically dissociable from the meiotic program in mice
Oogenesis is a developmental program by which a gametogenesis-competent germ cell becomes a fertilization-competent egg. During oogenesis, growth and differentiation of oocytes are closely coordinated with initiation and progression through meiosis. In mammals, the timing of meiotic initiation is …
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