Search for dissertations about: "Embryo aberrations"

Showing result 1 - 5 of 7 swedish dissertations containing the words Embryo aberrations.

  2. 1. Biomarkers and bioindicators of hypoxia and sediment toxicity in Monoporeia affinis

    Author : Marie Löf; Brita Sundelin; Tina Elfwing; Elena Gorokhova; Ingela Dahllöf; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biomarkers; Bioindicators; Embryo aberrations; Hypoxia; Contaminated sediment; PAHs; PCBs; Metals; Baltic Sea; Amphipods; Monoporeia affinis; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : Two of the most pressing environmental problems in the Baltic Sea are pollution and oxygen deficiency. The aim of this doctoral thesis was to evaluate a set of biomarkers and reproductive variables in the amphipod Monoporeia affinis to test their suitability as indicators of exposure to contaminants and hypoxia. READ MORE

  4. 2. Studies on in vitro fertilised human preembryos. Morphological and chromosomal aspects

    Author : Thorir Hardarson; Göteborgs universitet; []
    Keywords : IVF; oocyte; embryo; blastocyst; human; FISH; aneuploidy;

    Abstract : The success rate of in vitro fertilisation (IVF) has gradually increased due to basic research in preembryonic biology and the introduction of new methods, both technical and medical. However, further research is needed to establish which preembryos are developmentally most competent in order to be able to maintain the pregnancy rate while only a single preembryo is being transferred. READ MORE

  5. 3. Improved environmental monitoring and assessment : Establishing links between effects of chemical pollution at different levels of biological organization in a Baltic Sea bioindicator species (Monoporeia affinis)

    Author : Martin Reutgard; Magnus Breitholtz; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Environmental health assessment; environmental monitoring; chemical pollution; hypoxia; bioindicators; biomarkers; teratogenicity; embryo toxicity; oxidative stress; acetylcholine esterase. Monoporeia affinis; Baltic Sea; Applied Environmental Science; tillämpad miljövetenskap;

    Abstract : A large number of chemicals enters the marine environment via atmospheric deposition, run-off, rivers and streams, industrial effluents and municipal wastewater. To understand how chemicals affect environmental health, monitoring and assessment approaches need to combine physical, chemical and biological effect parameters from different levels of biological organization. READ MORE

  6. 4. The fate of primary aneuploid cells in early embryonic development and stem cells

    Author : Daniel Aaron Lightfoot; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Mosaic; aneuploid; embryo; gastrulation; ES cell; SYCP3;

    Abstract : Chromosomal aberrations occurring during gametogenesis and early embryonic development play a significant role in infertility and fetal loss in humans. Germ cells that have an abnormal number of chromosomes (aneuploidy) are generated mainly due to errors during female gamete formation, a phenomenon increasing in occurrence with age. READ MORE

  7. 5. bHLH transcription factors in differentiating neuroblastoma cells

    Author : Anna Grynfeld; Avdelningen för molekylärmedicin och genterapi; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; bHLH; Neuroblastoma; HES-1; HASH-1; N-Myc; differentiation; Mad; Medicine human and vertebrates ; Medicin människa och djur ;

    Abstract : Neuroblastoma is a tumor of the sympathetic nervous system, and arises during early childhood. The tumor is highly heterogeneous and evidence, such as expression of genes normally only expressed during embryonic and fetal stages, suggests that the tumor is of embryonic origin and that the tumor arises as a consequence of perturbed differentiation during the development of the sympathetic nervous system. READ MORE