Search for dissertations about: "phylogenetic signal"

Showing result 1 - 5 of 20 swedish dissertations containing the words phylogenetic signal.

  1. 1. Evolution of the G protein-coupled receptor signaling system : Genomic and phylogenetic analyses

    Author : Arunkumar Krishnan; Helgi Schiöth; Torgeir Hvidsten; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; GPCRs; G proteins; Sensory system; Signal transduction; Olfaction; Chemosensation; Hemichordates; Sponges; Porifera; Bilaterians; Holozoans; Fungi; Opisthokonts; Bioinformatics; Bioinformatik;

    Abstract : Signal transduction pathways mediated by G protein-coupled receptors (GPCRs) and their intracellular coupling partners, the heterotrimeric G proteins, are crucial for several physiological functions in eukaryotes, including humans. This thesis describes a broad genomic survey and extensive comparative phylogenetic analysis of GPCR and G protein families from a wide selection of eukaryotes. READ MORE

  2. 2. Phylogeny and Signal Diversity in Widowbirds and Bishops (Euplectes spp.)

    Author : Maria Prager; Göteborgs universitet; []
    Keywords : Ploceidae; weaverbirds; stochastic character mapping; phylogenetic uncertainty; mate choice; status signalling; sexual dichromatism; C4-oxygenation; status signalling;

    Abstract : Although sexual selection for elaborate signals is well documented in numerous species, the extreme diversity in signal design and expression in many taxa is largely unexplained. This thesis explores phylogenetic, mechanistic and ontogenetic explanations for divergence in two classic condition-dependent signal traits in the African widowbirds and bishops (Euplectes spp. READ MORE

  3. 3. Ecological and evolutionary assembly processes and metacommunity structure

    Author : Mikael Pontarp; Evolutionär ekologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Community; metacommunity; phylogenetic signal; ecology; evolution; assembly process; marine bacteria; habitat filtering; competition; mathematical modeling; simulation; eco-evolutionary;

    Abstract : This thesis aims to elucidate the link between abiotic and biotic effects and biogeographical contingencies, eco-evolutionary assembly processes, and community structure in a spatially explicit metacommunity framework. To this end, we used structure analysis of naturally sampled and experimentally manipulated marine bacterial communities and mathematical eco-evolutionary modeling and simulations of metacommunity assembly. READ MORE

  4. 4. Computational identification of RNA and protein components from the Signal Recognition Particle

    Author : Magnus Alm Rosenblad; Göteborgs universitet; []
    Keywords : signal recognition particle; SRP; RNA secondary structure; non-coding RNA;

    Abstract : Problem. The signal recognition particle (SRP) is a ribonucleoprotein particle that targets proteins to the endoplasmic reticulum in eukaryotes, to the plasma membrane in Archaea and Bacteria and to the thylakoid membrane in chloroplasts of photosynthetic organisms. It has one RNA component and 1 6 proteins. READ MORE

  5. 5. The Dawn of a New Age : Interrelationships of Acoela and Nemertodermatida and the Early Evolution of Bilateria

    Author : Andreas Wallberg; Ulf Jondelius; Mikael Thollesson; Graham Budd; Gonzalo Giribet; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Acoela; Nemertodermatida; Bilateria; Metazoa; evolution; phylogenetic inferrence; ancestral reconstruction; taxon sampling; microRNA; Systematics and phylogenetics; Systematik och fylogeni; systematisk zoologi; Systematic Zoology;

    Abstract : Deciphering the rapid emergence of bilaterian animals around the time of the Cambrian Explosion and reconstructing the interrelationships of animal groups have long been two of the most elusive problems in Zoology. This thesis concerns the phylogenetic interrelationships within and among Acoela and Nemertodermatida, two groups of small worms that are believed to be basal bilaterians and which may provide important clues for understanding the early evolution of animals. READ MORE