Université de Fribourg

Interactions of "Sarracenia purpurea" and its inquilines : comparing Europe and North America

Zander, Axel ; Bersier, Louis-Félix (Dir.)

Thèse de doctorat : Université de Fribourg, 2016 ; no. 1984.

Sarracenia purpurea is a carnivorous pitcher plant from North America and a model system for aquatic communities. After the pitchers fill up with rainwater, a food web forms in these detritus-fueled ecosystems ranging from bacteria to insect larvae, including the top predator Wyeomyia smithii. Two weeks after opening this food webs consists only of a handful of small and fast dispersing species...

Université de Fribourg

Genetic control of photoreceptor terminal differentiation in Drosophila melanogaster

Bernardo-Garcia, F. Javier ; Sprecher, Simon (Dir.)

Thèse de doctorat : Université de Fribourg, 2018 ; no. 2066.

Why do photoreceptors differentiate in the eye? Though simple, biologically this is an important question, and it may prove complex to answer. To present a bigger picture: animals have evolved a diversity of highly specialised sensory organs, which they use to obtain information from their environment and thus survive. These organs contain different types of receptor neurons. For example, there...

Université de Fribourg

Insect and mollusc communities in wildflower strips : effects of plant diversity and surrounding landscape in an agro-ecosystem

Fabian, Yvonne ; Bersier, Louis-Félix (Dir.)

Thèse de doctorat : Université de Fribourg, 2013 ; no. 1780.

Agricultural land covers approximately 38% of the world's land area, so its contribution to biodiversity is critical for successful conservation in the future. Managed in the right way, agriculture can contribute to the conservation of high-diversity systems, which may provide important ecosystem services such as pollination and biological control. The identification of environmental factors that...

Université de Fribourg

The influence of light on the circadian clock of mice and men

Jud, Corinne ; Albrecht, Urs (Dir.)

Thèse de doctorat : Université de Fribourg, 2009 ; Nr. 1625.

The continuous light-dark cycles caused by the rotation of the Earth around its own axis facilitated the evolution of circadian clocks, which have a huge impact on our daily life. Deregulation of the internal clock can lead to sleeping disorders, depression and various other health problems. Thus it is important to understand the mechanisms which allow our clock to tick properly. Since circadian...

Université de Fribourg

Eukaryotic sterol homeostasis : steryl ester hydrolases in "Saccharomyces cerevisiae"

Köffel, René ; Schneiter, Roger (Dir.)

Thèse de doctorat : Université de Fribourg, 2006 ; Nr. 1533.

Sterol homeostasis in eukaryotic cells relies on the reciprocal interconversion of free sterols and steryl esters (STE). The formation of STE is well characterized, but the mechanisms that control steryl ester mobilization upon cellular demand are less well understood. STE constitute an important storage form for fatty acids and sterols that are deposited in intracellular lipid particles. To...

Université de Fribourg

Identification of differentially expressed target genes of human nucleosome remodelling Mi-2 orthologue LET-418 in "C. elegans"

Zhang, Yue ; Müller, Fritz (Dir.)

Thèse de doctorat : Université de Fribourg, 2006 ; no. 1532.

Les complexes multi-protéiques remodelant la chromatine ont été démontrés comme étant impliqués dans différents procédés tels la transcription, la réplication, l’assemblage de la chromatine et la condensation des chromosomes. Des mutations dans les composants de ces complexes multi-protéiques causent diverses maladies chez l’être humain, comme la maladie d’Alzheimer ou...