Search for dissertations about: "ganglion cells"

Showing result 6 - 10 of 78 swedish dissertations containing the words ganglion cells.

  2. 6. Neural limits of visual resolution

    Author : Zoran Popovic; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; cell separation; cortical magnification; detection; estimated receptive field; high-pass filtered optotypes; nyquist limit; psychophysics; resolution; ganglion cells;

    Abstract : Aims: The aim of this thesis was to formulate a model of retinal neural circuitry in humans based on morphological estimates of retinal cone and ganglion cell populations, to compare results based on this model to psychophysical measurements of visual resolution and identify the retinal neural factors that limit visual resolution.Materials & Methods: Total displacement of central ganglion cells from foveal cones was obtained by estimating the length of fibers of Henle in four human retinas along the nasal or vertical hemi-meridians. READ MORE

  4. 7. Strategies in Cochlear Nerve Regeneration, Guidance and Protection : Prospects for Future Cochlear Implants

    Author : Fredrik Edin; Helge Rask-Andersen; Peetra Magnusson; Maoli Duan; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Human vestibular nerve; Scarpa s ganglion; Stem cells; Nanoparticles; Nanocrystalline diamond; Oto-Rhino-Laryngology; Oto-rhino-laryngologi; Medical Science; Medicinsk vetenskap;

    Abstract : Today, it is possible to restore hearing in congenitally deaf children and severely hearing-impaired adults through cochlear implants (CIs). A CI consists of an external sound processor that provides acoustically induced signals to an internal receiver. READ MORE

  5. 8. The diverse role of laminin isoforms in neuronal cells, human mast cells and blood platelets

    Author : Wondossen Sime; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Laminins; extracellular matrix; integrins; tooth pulp fibroblasts; mast cells; megakaryocytes; platelets; cell adhesion; cell migration; neurite outgrowth;

    Abstract : The close interaction of cells with other cells and with extracellular matrix (ECM) components is a prerequisite in a number of biological activities. During development of the nervous system, axons often navigate a considerable distance depending on the type of molecular factors they encounter. READ MORE

  6. 9. Transplantation of mesenchymal stem cells and injections of microRNA as therapeutics for nervous system repair

    Author : Mallappa K. Kolar; Lev N. Novikov; Paul J. Kingham; Mikael Wiberg; Elisabet Åkesson; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; spinal cord injury; peripheral nerve injury; mesenchymal stem cells; regeneration; neurotrophic factor; angiogenic factor;

    Abstract : Traumatic injuries to the spinal cord (SCI) and peripheral nerve (PNI) affect several thousand people worldwide every year. At present, there is no effective treatment for SCI and despite continuous improvements in microsurgical reconstructive techniques for PNI, many patients are still left with permanent, devastating neurological dysfunction. READ MORE

  7. 10. Spatial Vision in Birds: Anatomical investigation of spatial resolving power

    Author : Mindaugas Mitkus; Funktionell zoologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Raptors; Seabirds; Parrots; Birds; Double cones; Development; Retinal ganglion cells; Visual spatial resolution; Visual ecology; Vision;

    Abstract : Avian eyes are big both in relative and absolute terms, thus the importance of vision to birds is obvious. Even though the general eye plan is rather conservative throughout the group, there is a great variation in visual capabilities. READ MORE