Sökning: "Yolk"

Visar resultat 11 - 15 av 40 avhandlingar innehållade ordet Yolk.

1. 11. Roles of ERα and ERβ in Normal and Disrupted Sex Differentiation in Japanese Quail

   Författare :Anna Mattsson; Björn Brunström; Krister Halldin; Lena Sahlin; Uppsala universitet; []
   Nyckelord :Toxicology; sex differentiation; estrogen receptor; sexual behavior; endocrine disruption; Japanese quail; Toxikologi;

   Sammanfattning : Exposure to xenoestrogens during development has been shown to impair sexual differentiation in various species. The major aim of this thesis was to elucidate the respective roles of the two estrogen receptors ERα and ERβ in normal and disrupted differentiation of sex organs and copulatory behavior in the Japanese quail (Coturnix japonica). LÄS MER

3. 12. Effects of abiotic and biotic factors on hatching, emergence and survival in Baltic salmon (Salmo salar L.)

   Författare :Eva Brännäs; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Baltic salmon; salmo salar; eggs; egg colour; alevins; fry; photoperiod; temperature; hatching; emergence pattern; synchronization; survival;

   Sammanfattning : This thesis deals with important factors that affect the temporal organization of emergence and early survival of Baltic salmon (Salmo salar L.). The study population was obtained from the Norrfors hatchery (63°50'N,20°05'E), Umeälven (Ume river) in Northern Sweden. LÄS MER

4. 13. The role of TGF-§ in hematopoiesis

   Författare :Jonas Larsson; Avdelningen för molekylärmedicin och genterapi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Transforming growth factor-§; Cre loxP system; receptor; knockout; embryogenesis; angiogenesis; hematopoiesis; hematopoietic stem cell; inflammation; Medicine human and vertebrates ; Medicin människa och djur ;

   Sammanfattning : Transforming growth factor-§ (TGF-§) is a potent, multifunctional growth factor affecting virtually all cell types, regulating critical physiological processes like immune response, wound healing, angiogenesis, and tumor development. A large number of studies in vitro have also implicated a critical role of TGF-§ in regulating hematopoiesis by inhibiting proliferation of hematopoietic stem cells (HSCs). LÄS MER

5. 14. Sex, Molecules, and Gene control : Ecophysiological and evolutionary aspects of key sponge species from Antarctic shallow waters and the deep sea

   Författare :Vasiliki Koutsouveli; Paco Cárdenas; Anders Backlund; Ana Riesgo; Cassandra G. Extavour; Uppsala universitet; []
   Nyckelord :Porifera; Demospongiae; Geodia spp.; Phakellia ventilabrum; reproduction; gametogenesis; Antarctica; deep sea; sponge grounds; histology; molecular machinery; electron microscopy; RNA-seq; proteomics; lipidomics; Farmakognosi; Pharmacognosy;

   Sammanfattning : Very little is known about the ecophysiological aspects of Porifera (sponges) from Antarctica and North Atlantic, even though they are keystone components of these habitats. Being the earliest diverging metazoan lineage, sponges also play a fundamental role in our understanding of animal evolution. LÄS MER

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

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

   Sammanfattning : 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. LÄS MER