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Showing 1 to 20 of 122 for “"Gonad"”.
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Endocrine Influences on the Development of the Rudimentary Gonad of Fowl
Made available in DSpace on 2014-12-05T17:47:16Z (GMT). No. of bitstreams: 1 0006956.pdf: 3609933 bytes, checksum: bad0c4eb9df9deedbc93011210345181 (MD5) Previous issue date: 1953
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Sexual differentiation of somatic and germ cell lineages of the mouse gonad
The process of gonadal sex differentiation in mammals remains poorly understood despite the identification of a few key genes such as Sry and Sox9. To further our understanding of gonad organogenesis, a PCR based subtractive hybridization was performed to identify mouse genes that demonstrate …
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Growth and Characterization of Cell Cultures of Rainbow Trout
Gonad and spleen primary cultures of rainbow trout (Salmo gairdneri Richardson) were initiated and compared to the rainbow trout gonad transformed cell line RTG-2. The RTG-2 cell line grew faster than the gonad primary cultures. The chromosome number of the gonad primary culture was 2n=56 with 104 …
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The use of ULVA as a feed supplement in the development of an artificial diet and feeding regimes to produce export quality roe from the sea urchin Tripneustes gratilla (Linnaeus)
… development of a high quality, costeffective, gonad-conditioning diet that can produce large, marketable quality gonads. The aim of this research was to determine whether Ulva supplementation would improve palatability, consumption and digestibility of an artificial feed administered to T. …
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Investigation of the barium enema x-ray examination as a significant contributor to the genetically-significant dose from diagnostic radiology
… These skin entrance doses were used to calculate gonad doses with the aid of a computer program from the Food and Drug Administration in the USA (Peterson and Rosenstein, 1989). The results were compared with the results of the barium enema component of the research conducted by Maree. The …
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Morphogenesis and Female Fate Determination in Vertebrates
<p>A unique feature of the fetal gonad is its ability to form two distinct organs, the testis and the ovary, from a single bipotential primordium. The outcome of this decision, which is made by a population of somatic cells known as the bipotential supporting cell precursors, determines whether an …
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Feeding habits of sardine (Sardinops sagax) in relation to their spawning activities
… correlated with caudal length across different gonad maturity and fat stages. Feeding intensity tended to be higher in small than large sardine (r = -0.14, n = 373, p = 0.005) and similar for both sexes (t = 1.567, df = 371, p = 0.12). Feeding intensity was high in St Helena Bay, possibly …
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Feeding habits of sardine (Sardinops sagax) in relation to their spawning activities
… correlated with caudal length across different gonad maturity and fat stages. Feeding intensity tended to be higher in small than large sardine (r = -0.14, n = 373, p = 0.005) and similar for both sexes (t = 1.567, df = 371, p = 0.12). Feeding intensity was high in St Helena Bay, possibly …
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Steroid Stimulated Protein Synthesis in Fish Cell Cultures
Protein synthesis in Gonad primary cell cultures and Chinook Salmon Embryo cell cultures (CHSE-214) was stimulated by 17-beta-estradiol, 17-alpha-hydroxyprogesterone, and testosterone. Cells were treated for six hours with a 10-6 M concentration of steroid and radiolabelled with 35s-methionine for …
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Ecophysiology of the black mussel Choromytilus meridionalis (Krauss)
… Bay, South Africa. The reproductive season and gonad development is described from monthly measurements made over a period of 4 years. Spawning usually extends from July to February and is characterised by peaks of gamete release interspersed with regeneration of the gonad. Individual fecundity …
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An ultrastructural study of gametogenesis and early development in the sea anemone <i>Actinia fragecea</i> (Cnidaria : Anthozoa)
… 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 activity. Oocytes arise in the gonad epithelia, but soon migrate into the mesogloea. During …
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Ciclo reprodutivo de Echinaster (Othilia) brasiliensis Müller & Troschel, 1842 (Echinodermata: Asteroidea) na região do Cabo Frio, RJ
… 2000. Reproductive cycle was studied using gonad index and histological analysis of gonads. E. (O.) brasiliensis exhibited a continuous reproduction. Histological analysis of gonads showed asynchrony in gametogenesis among the individuals of this population. Small and mesovitellogenic …
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Broodstock management and egg quality of the pearl oysters Pinctada margaritifera and Pinctada fucata
… saibo donors. A biopsy technique to obtain gonad tissue was assessed in P. margaritifera. Prior to biopsy, oysters were anaesthetised with 2 mL L-1 of propylene phenoxetol. Three different 9 cm long biopsy needles (16, 18 and 20 gauge) with a 10 mm sample notch, were compared as a means of …
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Reproduction And Propagation Of The Neosho Mucket, Lampsilis Rafinesqueana
… brood continuously from fall through summer. Gonad fluid was collected in the field and examined microscopically 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 …
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Reversible Germline Dynamics of Caenorhabditis elegans During Exposure to Pathogenic Bacteria
… several processes that arise in the C. elegans gonad upon exposure to pathogenic Pseudomonas aeruginosa. I show there is a marked reduction in brood size with concomitant reduction in gonad size and the number of nuclei in the germline. I define two processes that are induced that contribute to …
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Reproductive ecology of Vestimentifera (Polychaeta: Siboglinidae) from hydrothermal vents and cold seeps
… that vestimentiferans store lipids in the gonad. However, because the gonadal tissue has never been dissected and compared with the other tissues of the trunk, it was not possible to determine whether the gonad comprises the only lipid store in vestimentiferans, or if different lipid …
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The role of the Fused toes locus containing Iroquois homeobox gene 3, 5, and 6 and Ftm, Fto, and Fts during ovary and testis development in mice
… genes: Fto, Fts, and Ftm, during male and female gonad development. Ft mutant mice are missing Ft locus genes whose function is unknown during male and female gonad development. These six missing genes show stage and sex specific expression patterns during sex determination and differentiation in …
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DOES FAT MATTER? Lipidomics investigations during Blue mussel (Mytilus sp.) hatchery production
… these approaches, I described the gonad lipidome in the testis and ovary and the acclimation responses to different temperature programmes during BSC in broodstock gonad lipidome. Furthermore, the integration of gonad histological analysis with their lipid profiles permitted the …
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Biologia reprodutiva e estrutura de duas populações de Coscinasterias tenuispina (Lamarck, 1816) (Echinodermata: Asteroidea) na região do Cabo Frio, Rio de Janeiro
… intertidal region at Praia da Ferradura, Búzios. Gonad indices of both populations showed low reproductive potential, and the histological analyses recorded that gametes were released during all months. A reciprocal relationship between gonad and pyloric caecum indices was not evident. The …
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