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 18 of 18 for “"sex reversal"”.
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Primary Sex Reversal in Female <em>Betta splendens</em> following Treatments with Temperature and Trenbolone Acetate.
<p>Sex reversal in fish can occur as a result of disturbances in natural conditions or laboratory manipulations. Trenbolone Acetate (TBA), a synthetic anabolic-androgenic steroid used mainly in the cattle industry, was applied to female <em>Betta splendens</em>, a sexually dimorphic fish. …
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Effect of pawpaw (Carica Papaya) seed meal on growth performance, feed utilization, survival and masculinization of sexualy undifferentiated three spotted Tilapia (Oreochromis Andersonii) fry
… performance, feed utilization, survival rate and sex ratio of sexually undifferentiated three spotted tilapia (Oreochromis andersonii) fry. Six treatments (replicated thrice) were designed based on the control (basal diet), 17 α-methyltestosterone (MT) (60 mg) and C. papaya seed meal incorporated …
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Diverse outcomes of homologous recombination in the human Y chromosome
Mammalian sex chromosomes began diverging from an ordinary pair of autosomes roughly 300 million years ago. Inversions in the evolving Y chromosome sequentially suppressed recombination with the X chromosome. While pseudoautosomal regions in the human Y chromosome still participate regularly in …
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Adamts9 is critical for the development of primary ovarian follicles
… Adamts9 KO zebrafish had a heavily male-biased sex ratio as 6–7-month-old adults, and female Adamts9 KOs were infertile. Furthermore, a novel intersex phenotype was also discovered in Adamts9 KOs zebrafish. These fish lacked clearly defined ovary or testis structure. To further understand the …
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Sex determination in southern flounder, Paralichthys lethostigma from the Texas Gulf Coast and implications of climate change
… Paralichthys, temperature plays a large role in sex determination. Thus, global climate change could have significant effects on southern flounder (Paralichthys lethostigma), a commercially and recreationally important flatfish whose populations have steadily declined in Texas in the last 25 …
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Uso de prebiótico para tilápia-do-nilo durante o período de inversão sexual
… of prebiotic mananoligossacarids (MOS), during sex reversal in Nile tilapia (Oreochromis niloticus). Sixteen glass aquaria were used with a capacity of 50 liters with water circulation, temperature controlled water and continuous aeration system, 240 animals were used: 15 tilapia larvae per …
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Various aspects of reproductive control in freshwater fishes
… or exogenous testosterone in enhancing male sexual behavior and coloration in males or females. An inverse relationship existed between the numbers of cysts in the early stages of spermatogenesis and the number of spermatophores for males receiving any of the steroids. Only one female in the …
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Epigenetic Regulation of Nuclear Hormone Receptor DAX-1
… the region containing the NR0B1 gene results in sex reversal, and mutations in NR0B1 cause adrenal hypoplasia congenita. DAX-1 has been observed to act as a corepressor of other nuclear receptors including androgen receptor (AR), estrogen receptor (ER), and steroidogenic factor 1 (SF-1). In …
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Regulation of proliferation, apoptosis, and metastasis in prostate cancer cells by DAX-1 (NR0B1)- an androgen-induced orphan nuclear receptor
<p>DAX-1 (Dosage-sensitive sex reversal, adrenal hypoplasia congenita, critical region on the X-chromosome, gene 1) is an unusual member of the Nuclear Hormone Receptor superfamily that has the ability to interact with other Nuclear Receptors (NRs) and transcriptional co-repressors and …
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The role of orphan nuclear receptor DAX-1 (NR0B1) in human breast cancer cells: expression, proliferation and metastasis
… nuclear hormone receptor DAX-1 (Dosage Sensitive Sex Reversal, Adrenal Hypoplasia Congenita on the X Chromosome, gene 1) plays an important role in the development of adrenal and gonadal tissues and functions as a global negative-regulator of steroidogenesis. In addition, it is known to be …
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Comparisons of tilapia seed production under various broodstock densities and fry stocking densities
… stocked with brood stock (mean wt. 680 g), at a sex ratio of 3 females to 1 male. Nine tanks were stocked at one of three densities (1, 2, and 4 females m-2), and seed was collected from females' mouths weekly. Three additional tanks were stocked at a density of 2 females m-2, and fry were …
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SF-1, BUT NOT DAX-1, PREVENTS P19 CELLS FROM DIFFERENTIATING TO EITHER TROMA-1 OR TUJ1 POSITIVE CELLS UPON RA-TREATMENT
… identified by the microarray, Dosage-sensitive sex reversal, adrenal hypoplasia critical region, on chromosome X, gene 1 (DAX-1) and steroidogenic factor 1 (SF-1) were identified to be directly or indirectly regulated by PBX. Both DAX-1 and SF-1 proteins have only recently been reported to be …
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Consequences of short-term water temperature variability to fish: Current and future climate change impacts
… fluctuations can induce non-directional sex reversal, thereby potentially affecting population sex ratios and population-level reproductive success. Finally, a spatially-explicit, individual-based model of smallmouth bass (<em>Micropterus dolomieu</em>) near a power plant thermal …
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Regulation of Adrenal Steroidogenesis by Interleukin-6
… regulatory protein (StAR), and dosage sensitive sex reversal adrenal hypoplasia congenita critical region on the X chromosome, gene 1 (DAX-1). In human H295R cells and bovine zona fasciculata cells IL-6 caused an increase in SF-1, StAR, P450scc, 17α hydroxylase, 3β-hydroxysteroid dehydrogenase …
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The Influence of Estrogen Signaling on Male Reproduction in Medaka (Oryzias latipes)
… reproduction. In fish, observed effects include sex reversal, presence of testicular oocytes, altered courting behavior, vitellogenin synthesis in males, altered fertility and gonadal histopathology. Understanding how xenoestrogens exert their effects is complicated by the existence of multiple …
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Genomic analysis of sex chromosomes and sex differentiation in Caricaceae
… excellent model species to study mechanisms for sex determination and sex chromosome evolution in plants, due to the presence of three sex types: female, male, and hermaphrodite. Previous research has revealed the location of the sex determination region (SDR) and the existence of three sex …
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Epigenetics and sex expression in trioecious papaya
Sex determination in papaya is regulated by a pair of recently evolved sex chromosomes. Genomic and genetic studies over the past century have made significant achievements towards the understanding of the sex determination system in papaya. However, the epigenetic aspects of sex determination and …
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The role of beta-catenin in the development of fetal ovary and female germ cells
Ovarian development in mammals is considered as a default process, arising only in the absence of Sry, a testis-determining gene. However, current evidence has suggested the presence of an active pathway in fetal ovary. In particular, gene screening experiments have shown that many genes are …