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Visar resultat 11 - 15 av 50 avhandlingar som matchar ovanstående sökkriterier.

1. 11. Aerobic fitness and healthy brain aging : cognition, brain structure, and dopamine

   Författare :Lars Jonasson; Carl-Johan Boraxbekk; Katrine Riklund; Emrah Düzel; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Aerobic exercise; VO2; working memory; executive function; freesurfer; striatum; dopamine; D2-receptors; [11C]raclopride;

   Sammanfattning : Background: Performing aerobic exercise and maintaining high levels of aerobic fitness may have positive effects on both brain structure and function in older adults. Despite decades of research however, there is still a rather poor understanding of the neurocognitive mechanisms explaining the positive effects of aerobic exercise on cognition. LÄS MER

3. 12. Unconventional Modulation of Diarylethene Photoswitches

   Författare :Wera Larsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; photochromic molecules; photochemistry; photon upconversion; molecular photoswitches; triplet-triplet annihilation; diarylethene; nanocrystals; triplet sensitization;

   Sammanfattning : Light can be manipulated and modulated to fit a particular need or application, such as overcoming a spectral mismatch when facilitating a high energy photochemical reaction. This can be of use in various applications, including solar energy conversion and biological contexts. LÄS MER

4. 13. Towards Plane Hurwitz Numbers

   Författare :Jared Ongaro; Boris Shapiro; Roy Skjelnes; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Algebraic curves; Hurwitz spaces; Mathematics; matematik;

   Sammanfattning : The main objects of this thesis are branched coverings obtained as projection from a point in P^2. Our general goal is to understand how a given meromorphic function f: X -> P^1 can be induced from a composition X --> C -> P^1, where C is a plane curve in  P^2 which is birationally equivalent to the smooth curve X. LÄS MER

5. 14. Quinine as a model for the study of cochlear hearing loss in humans

   Författare :Erik Berninger; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :cochlear function; hearing loss; inner ear; otoacoustic emissions; quinine; pharmacokinetics; pharmacodynamics;

   Sammanfattning : Quinine has been used for centuries and is still recommended for the treatment of severe falciparum malaria and non-severe chloroquine-resistant malaria. Among its side effects is the concentration-dependent and reversible cochlear hearing loss. LÄS MER

7. 15. Posttraumatic Stress Disorder (PTSD) in the General Population

   Författare :Örjan Frans; Mats Fredrikson; Hans Ågren; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Psychology; posttraumatic stress disorder; trauma; epidemiology; general population; prevalence; traffic road accidents; DSM-structure; positron emission tomography; regional cerebral blood flow; symptom provocation; selective serotonin reuptake inhibitor; Psykologi; Psychology; Psykologi; klinisk psykologi; Clinical Psychology;

   Sammanfattning : This thesis explored the epidemiology of Posttraumatic Stress Disorder (PTSD) and different aspects of the disorder. Firstly, we investigated the lifetime prevalence of traumatic experiences and PTSD in the general adult population in Sweden and evaluated the impact of different trauma types, trauma frequency, and perceived distress. LÄS MER