Search for dissertations about: "oocyte maturation"

Showing result 1 - 5 of 15 swedish dissertations containing the words oocyte maturation.

  1. 1. Teleost reproduction: Aspects of Arctic char (Salvelinus alpinus) oocyte growth and maturation

    Author : Håkan Berg; Per-Erik Olsson; Birgitta Norberg; Umeå universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Zoophysiology; Salmonid; oocyte growth; vitellogenin; vitelline envelope protein; stress; cortisol; oocyte maturation; membrane receptor; Zoofysiologi; Animal physiology; Zoofysiologi; Zoophysiology; zoofysiologi;

    Abstract : In all vertebrate species, reproduction is a hormonally controlled process, important for growth and maturation of gonads and germ cells. Production of functional germ cells is of outmost importance to secure the survival of a species. Fish comprises 50% of the known vertebrates and are found in aquatic habitats all over the world. READ MORE

  2. 2. Signaling pathways in the development of female germ cells

    Author : Deepak Adhikari; Kui Liu; Elisabet Stener-Victorin; Umeå universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; ovary; primordial follicle; activation; mTORC₁; PI₃K; oocyte maturation; MPF; Cdk₁; medicinsk biokemi; Medical Biochemistry;

    Abstract : Primordial follicles are the first small follicles to appear in the mammalian ovary. Women are born with a fixed number of primordial follicles in the ovaries. Once formed, the pool of primordial follicles serves as a source of developing follicles and oocytes. READ MORE

  3. 3. The role of leptin in zebrafish (Danio rerio) : Novel insights into appetite regulation and reproduction

    Author : Emmanouil Tsakoumis; Monika Schmitz; Tatjana Haitina; Åsa Wallén-Mackenzie; Ana Gómez Peris; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; zebrafish; leptin; appetite; GRN; brain; reproduction; oocyte maturation; ovulation; Biology with specialization in Comparative Physiology; Biologi med inriktning mot jämförande fysiologi;

    Abstract : The hormone leptin is a peripheral metabolic signal and an important regulator of energy balance. In mammals, leptin acts on the appetite centers in the hypothalamus, causing anorexigenic functions by inhibiting food intake. It is also considered as a link between the nutritional status and the endocrine reproductive axis. READ MORE

  4. 4. Biological Markers of Fertility

    Author : Sarah Nordqvist; Helena Åkerud; Karin Kårehed; Agneta Skoog Svanberg; Anneli Stavreus-Evers; Geraldine Hartshorne; Uppsala universitet; []
    Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; angiogenesis; embryogenesis; female reproductive tract; fertility; fertilization; Histidine-rich glycoprotein; intron; in vitro fertilization; oocyte; ovarian response; pregnancy; single nucleotide polymorphism; Src homology 2 domain-containing adapter protein B;

    Abstract : Infertility affects 15 % of couples, which corresponds to 60 - 80 million worldwide. The microenvironments in which the oocyte, embryo and fetus mature are vital to the establishment and development of a healthy pregnancy. READ MORE

  5. 5. Growth hormone and somatolactin function during sexual maturation of female Atlantic salmon

    Author : Susana Benedet Perea; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Growth hormone; somatolactin; insulin-like growth factor I; GH; SL; IGFI; GHR; SLR; IGFIR; ovary maturation; reproduction; Atlantic salmon; spawning; pituitary;

    Abstract : Background and aims: The growth hormone-insulin-like growth factor I (GH-IGF-I) system is known to act during sexual maturation of female salmonids, but the specific roles are not known. Somatolactin (SL) is a pituitary hormone closely related to GH and is only found in fish. In some species, including salmonids, there are two forms, SLa and SLß. READ MORE