Sökning: "phylogenetic reconstruction"

Visar resultat 21 - 25 av 36 avhandlingar innehållade orden phylogenetic reconstruction.

  1. 21. Evolutionary transitions across the tree of life : Phylogenomic case studies in environmental archaea, bacteria and eukaryotes

    Författare :Max Emil Schön; Thijs J. G. Ettema; Fabien Burki; David Moreira; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Evolutionary transitions; environmental sequencing; metagenomics; single-cell genomics; phylogenomics; haloarchaea; Hikarchaeia; Rickettsiales; Picozoa; plastid evolution; Biologi med inriktning mot molekylär evolution; Biology with specialization in Molecular Evolution;

    Sammanfattning : Microbes form the majority of life on Earth, but have been systematically underrepresented in historical research. The sequencing revolutions of the last two decades have completely changed the way we can study microbial genomic information, giving us the means to probe ever deeper into their evolution. LÄS MER

  3. 22. Early Cambrian Problematic Lophotrochozoans and Dilemmas of Scleritome Reconstructions

    Författare :Cecilia M Larsson; Lars E Holmer; Christian B Skovsted; Anette E S Högström; John S Peel; Glenn A Brock; Michael J Vendrasco; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Problematica; scleritome; Trachyplax; tommotiid; Cambrian; South Australia; North Greenland; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Sammanfattning : The emergence and radiation of metazoan body plans around the Precambrian/Cambrian boundary, some 500-600 million years ago, seems to be concordant with the appearance and diversification of preservable hard parts. Several Precambrian soft-bodied, multicellular organisms most likely represent stem-group bilaterians, but their fossil record is rather sparse. LÄS MER

  4. 23. Orthology and protein domain architecture evolution

    Författare :Volker Hollich; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : A major factor behind protein evolution is the ability of proteins to evolve new domain architectures that encode new functions. Protein domains are widely considered to constitute the "atoms" of protein chains, acting as building blocks of proteins as well as evolutionary units. LÄS MER

  5. 24. Evolutionary studies of the Gnetales

    Författare :Chen Hou; Catarina Rydin; Richard Saunders; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; växtsystematik; Plant Systematics;

    Sammanfattning : The Gnetales consist of three distinct genera, Ephedra, Gnetum and Welwitschia with considerable divergence among them regarding morphological, ecological and molecular characters. A longstanding debate of the similarity between the Gnetales and angiosperms and the unresolved seed plant phylogeny intrigues plant scientists to further investigate the evolutionary history of the Gnetales. LÄS MER

  7. 25. Genetic variation of HIV-1 : molecular epidemiology and viral evolution

    Författare :Thomas Leitner; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : HIV-1 displays a very high genetic variability. The evolutionary process of the virus generates a nucleotide substitution rate which is approximately one million times faster than that of higher organisms. This remarkable rate in combination with a half-life of six to eight hours, gives HIV-1 an enormous potential of genetic adaptation. LÄS MER