Search for dissertations about: "spermatogenesis"

Showing result 16 - 20 of 47 swedish dissertations containing the word spermatogenesis.

  2. 16. Mammalian sperm flagella and cilia

    Author : Jikui Guan; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : In mammals, both sperm flagella and cilia are axoneme-containing organelles. The sperm flagella are major parts of the spermatozoa that are male gametes produced in the testis from progenitor spermatogonia through a process called spermatogenesis. READ MORE

  4. 17. Mechanisms of cell type-specific gene transcription : studies on the choline acetyltransferase gene

    Author : Peter Lönnerberg; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Choline acetyltransferase (ChAT) is the enzyme synthesizing the neurotransmitter acetylcholine. Previous studies from our laboratory on the regulation of the cholinergic phenotype have suggested the presence of regulatory elements in the ChAT gene controlling accurate time- and cell-specific expression. READ MORE

  5. 18. A functional genomics approach to PDGF and pericyte biology

    Author : Cecilia Bondjers; Göteborgs universitet; []
    Keywords : PDGF; hair follicle; skin; testis; epithelial-mesenchymal interaction; microarray; pericyte; transgenic mouse;

    Abstract : The rapid expansion of genome sequence data demands for increased efforts and speed concerning functional analysis of gene products. Two approaches to such analysis, namely transgenic technologies and analysis of gene expression have successfully been used to study functions of gene products in complex organisms, such as mammals. READ MORE

  6. 19. Sex and symbionts : New discoveries in local and regional patterns of coral ecology and reproduction

    Author : Micaela Hellström; Michael Tedengren; Mats Grahn; John A. H. Benzie; Nancy Knowlton; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Indo-Pacific; S. elegans; G. fascicularis; Symbiodinium; size; reproduction; allozymes; ITS2; mtDNA; geography; environment; Marine ecology; Marin ekologi; marin ekotoxikologi; Marine Ecotoxicology;

    Abstract : Coral reefs belong to the most diverse and the most threatened ecosystems on earth. Anthropogenic stressors and climate change have led to mortalities at levels unprecedented in modern times. The aims of this thesis are to investigate aspects of the corals’ ability to reproduce, disperse, adapt and survive. READ MORE

  7. 20. Metabolic Significance of Fatty Acid Elongation

    Author : Damir Zadravec; Anders Jacobsson; Douglas Tocher; Stockholms universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Physiology; Fysiologi; fysiologi; Physiology;

    Abstract : Very long-chain fatty acids (VLCFAs), including polyunsaturated fatty acids (PUFAs), are essential lipids whose functional diversity is made possible by variation in their chain length and degree of unsaturation. Fatty acids can either be derived directly from the diet or they can be synthesized de novo through lipogenesis, up to 16 carbons in length by fatty acid synthase. READ MORE