Sökning: "metazoa"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet metazoa.

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

    Författare :Andreas Wallberg; Ulf Jondelius; Mikael Thollesson; Graham Budd; Gonzalo Giribet; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 2. Regulation of mitochondrial gene expression in metazoa

    Författare :Ana Bratic; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Drosophila melanogaster; ;

    Sammanfattning : Mitochondria are essential organelles of eukaryotic cells and their main function is to provide the cell with the ubiquitously used energy currency ATP. Impaired energy conversion caused by mitochondrial dysfunction is a direct cause of several human diseases. LÄS MER

  4. 3. Mine the Gaps : Evolution of Eukaryotic Protein Indels and their Application for Testing Deep Phylogeny

    Författare :Pravech Ajawatanawong; Sandra Baldauf; James McInerney; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; indel; insertion deletion; protein evolution; bioinformatics; non-bilateria; eukaryotes; phylogeny; Biology with specialization in Systematics; Biologi med inriktning mot systematik; Biologi med inriktning mot molekylär evolution; Biology with specialization in Molecular Evolution;

    Sammanfattning : Insertions/deletions (indels) are potentially powerful evolutionary markers, but little is known about their evolution and few tools exist to effectively study them. To address this, I developed SeqFIRE, a tool for automated identification and extraction of indels from protein multiple sequence alignments. LÄS MER

  5. 4. Domain rearrangement and creation in protein evolution

    Författare :Diana Ekman; Arne Elofsson; Christine Orengo; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bioinformatics; Bioinformatik; Biochemistry; biokemi;

    Sammanfattning : Proteins are composed of domains, recurrent protein fragments with distinct structure, function and evolutionary history. Some domains exist only as single domain proteins, however, a majority of them are also combined with other domains. LÄS MER

  7. 5. Roles of Notch signalling in early embryonic development

    Författare :Heather Main; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Metazoan embryonic development requires a complex interplay of morphological processes coordinated with self-renewal and differentiation to correctly specify and maintain body cell types in the correct location. Notch signalling is a metazoan specific arbiter of cell fate decision processes, known to control lateral inhibition and asymmetric cell division processes throughout the metazoa and in the development of all metazoan organs. LÄS MER