Sökning: "Polymorphism"

Visar resultat 21 - 25 av 689 avhandlingar innehållade ordet Polymorphism.

1. 21. Mating behaviour in Drosophila melanogaster and its implication to genetic variation

   Författare :Sven-Eric Åslund; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; drosophila melanogaster; mating behaviour; fitness; allozymes; bristles; Y chromosome; polymorphism; selection;

   Sammanfattning : Not much is known about the mechanisms affecting the genetic composition of populations of different species. To investi­gate one of these potential mechanisms, mating behaviour, the fruit fly Drosophila melanogaster, was chosen as an experimen­tal animal. LÄS MER

3. 22. Influence of serotonin-related genes on behavior and body weight

   Författare :Jessica Bah Rösman; Göteborgs universitet; []
   Nyckelord :Serotonin; Genes; anorexia nervosa; premenstrual dysforia; body weight; suicide; polymorphism; HTR2C; SLC6A4; GATA2; HTR3B;

   Sammanfattning : Rationale: The neurotransmitter serotonin has been implicated in the regulation of normal behaviors, including food intake, and attributed importance for a variety of common psychiatric conditions, including major depression, suicidal behavior, eating disorders and premenstrual dysphoria. The purpose of these studies was to explore the possible influence of genetic variation in serotonin-related genes on a) body weight, b) binding capacity of the serotonin transporter in the brain of suicide attempters and c) a disorder for which numerous findings suggest serotonin to play a key role, i. LÄS MER

4. 23. Coffee and gene interaction. The effect on methionine and lipid metabolism

   Författare :Elisabeth Strandhagen; Göteborgs universitet; []
   Nyckelord :coffee; homocysteine; cholesterol; folate; pyridoxine; MTHFR; APOE; gene; polymorphism; interaction;

   Sammanfattning : Background: Different dietary factors influence the risk of coronary heart disease (CHD), most likely in an interaction with genetic polymorphisms. The knowledge about such interactions is insufficient. Some observational studies have shown an association between coffee and CHD, others have not. Coffee consumption affects some CHD risk factors, e. LÄS MER

5. 24. Avian MHC: variation and selection in the wild

   Författare :Helena Westerdahl; MEMEG; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; polymorphism; balancing selection; cDNA; avian malaria; great reed warbler; Djurekologi; bird; Animal ecology; immune defence; MHC class II; Major Histocompatibility Complex; MHC class I;

   Sammanfattning : In vertebrates the Major Histocompatibility Complex (MHC) plays a central role in the specific immune defence against various pathogens. Compared with other coding genes the MHC genes exhibit an extremely high level of polymorphism that is maintained by balancing selection. LÄS MER

7. 25. Genetic aspects of stroke : association and linkage studies in a northern Swedish population

   Författare :Per-Gunnar Wiklund; Birgitta Stegmayr; Kjell Asplund; Dan Holmberg; Alun Evans; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Internal medicine; stroke; genetics; polymorphism; association; linkage; risk factors; plasminogen activator inhibitor-1; tissue plasminogen activator; angiotensin converting enzyme; angiotensin II receptor type 1; phosphodiesterase 4D; Invärtesmedicin; Internal medicine; Invärtesmedicin; medicin; Medicine;

   Sammanfattning : Stroke is a common, multifactorial cardiovascular disease. A stroke event is the result of traditional risk factors (i.e. hypertension, diabetes, smoking), environmental exposures and genetic factors in a complex interplay. LÄS MER