Search for dissertations about: "Circadian variation"

Showing result 1 - 5 of 27 swedish dissertations containing the words Circadian variation.

2. 1. Studies on Natural Variation and Evolution of Photoperiodism in Plants

   Author : Karl Holm; Ulf Lagercrantz; Martin Lascoux; Seth Jon Davis; Uppsala universitet; []
   Keywords : photoperiodism; circadian; flowering time; natural variation; evolution; Caspella bursa-pastoris; Physcomitrella patens; Biologi med inriktning mot evolutionär funktionsgenomik; Biology with specialization in Evolutionary Functional Genomics;

   Abstract : Photoperiodism refers to the organism’s ability to detect and respond to seasonal changes in the daily duration of light and dark and thus constitutes one of the most significant and complex examples of the interaction between the organism and its environment. This thesis attempts to describe the prevalence of variation in a photoperiodic response, its adaptive value, and its putative genetic basis in a common cruciferous weed, Capsella bursa-pastoris (Brassicaceae). READ MORE

4. 2. Biological Rhythms of Pancreatic Secretion in Young Pigs with empahasis to the time around weaning

   Author : Mary-Jane Sebabatso Thaela; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Volume; Ultradian; Protein; Pancreas; Pig; IRCT; Insulin; Infradian; Glucose; Circadian; Chymotrypsin; Biologic week and Half-week; Chronome; Animal physiology; Djurfysiologi;

   Abstract : When the time structure (chronome) of pancreatic secretion was studied after weaning in 5-week-old pigs, the zero-amplitude (no-rhythm) assumption was rejected for the about-weekly (circaseptan, CS) and about-half-weekly (circasemiseptan, CSS) chronome components. When the data were assessed individually on a day-to-day basis, a 24-hour component was suggested (P. READ MORE

5. 3. Geographic variation in life cycles : Local adaptation and ecological genetics in a temperate butterfly

   Author : Olle Lindestad; Karl Gotthard; Sören Nylin; Christopher W Wheat; Greg Ragland; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; voltinism; local adaptation; insect; life cycle; seasonality; genomics; life history; zoologisk ekologi; Animal Ecology;

   Abstract : Conditions in nature change with the seasons, necessitating seasonal adaptations that synchronize the life cycles of organisms with their surroundings. Such regulatory adaptations must vary between populations to track local variation in climate and seasonality; this local adaptation is facilitated by locally specific seasonal cues, but may be hampered by gene flow and genetic history. READ MORE

6. 4. Mechanism-Based Modeling of the Glucose-Insulin Regulation during Clinical Provocation Experiments

   Author : Petra Jauslin-Stetina; Mats Karlsson; Nicolas Frey; Philippe Jacqmin; Uppsala universitet; []
   Keywords : Pharmacokinetics Pharmacotherapy; Glucose homeostasis; Type 2 diabetes; IVGTT; OGTT; Meal test; Circadian variation; Mechanism-based; NONMEM; Farmakokinetik Farmakoterapi;

   Abstract : Type 2 diabetes is a complex chronic metabolic disorder characterized by hyperglycemia associated with a relative deficiency of insulin secretion and a reduced response of target tissues to insulin. Considerable efforts have been put into the development of models describing the glucose-insulin system. READ MORE

7. 5. Circadian rhythms in the auditory system

   Author : Vasiliki Basinou; Karolinska Institutet; Karolinska Institutet; []
   Keywords : ;

   Abstract : Circadian clocks have been found in numerous cell types and tissues of the body, allowing organisms to coordinate their daily biological functions. They generate cycles of behavioral and physiological processes with a period length of ~24h, which are synchronized to the rotation of the Earth and the subsequent daily changes in illumination, temperature and humidity. READ MORE