Sökning: "Circumscription"

Visar resultat 1 - 5 av 13 avhandlingar innehållade ordet Circumscription.

  1. 1. Complexity Dichotomies for CSP-related Problems

    Författare :Gustav Nordh; Peter Jonsson; Andrei Krokhin; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Complexity; Constraint Satisfaction Problem; System of Equations; Nonmonotonic Logic; Circumscription; Abduction; Isomorphism; Computer science; Datavetenskap;

    Sammanfattning : Ladner’s theorem states that if P ≠ NP, then there are problems in NP that are neither in P nor NP-complete. Csp(Γ) is a class of problems containing many well-studied combinatorial problems in NP. LÄS MER

  3. 2. Phylogenetic Studies in the Lamiales with Special Focus on Scrophulariaceae and Stilbaceae

    Författare :Per Kornhall; Birgitta Bremer; Nigel Barker; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Bayesian inference; parsimony; phylogeny; Scrophulariaceae; Stilbaceae; taxonomy; Biologi; Biology; Biologi;

    Sammanfattning : This thesis deals with plants from the flowering plant order Lamiales, and especially the two families Scrophulariaceae and Stilbaceae. Both families have their main geographical distribution in southern Africa. The thesis presents phylogenies of Scrophulariaceae s. lat. LÄS MER

  4. 3. An evolutionary view of the taxonomy and ecology of Inocybe (Agaricales) with new perspectives gleaned from GenBank metadata

    Författare :Martin Ryberg; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inocybe; Inocybaceae; emerencia; GenBank; Insufficiently identified sequences IIS ;

    Sammanfattning : Inocybe (Inocybaceae) is one of the most speciose genera among the gilled mushrooms (Agaricales) but large parts of its taxonomy and evolutionary history remain poorly explored. The present thesis sho... LÄS MER

  5. 4. Phylogenetic Studies in the Euasterids II : with Particular Reference to Asterales and Escalloniaceae

    Författare :Johannes Lundberg; Olof Ryding; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organismic biology; Organismbiologi; Organism biology; Organismbiologi; systematisk botanik; Systematic Botany;

    Sammanfattning : The present study is concerned with the evolutionary relationships among the Euasterids II, a group of angiosperms that includes the orders Apiales, Aquifoliales, Asterales, and Dipsacales together with several small, poorly known families yet unplaced as to order.Parsimony analysis of nucleotide sequence data from the chloroplast genes atpB, ndhF and rbcL together with morphological data are used to construct a phylogeny of the order Asterals, which in the present sense includes 11 families and more than 26 000 species. LÄS MER

  7. 5. Phylogenetic Studies in the Gentianales – Approaches at Different Taxonomic Levels

    Författare :Maria Backlund; Mats Thulin; Birgitta Bremer; Kåre Bremer; Mikael Hedrén; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Gentianales; phylogeny; classification; rbcL; trnT-F; rps16; ndhF ndh; Paederieae; Putorieae; Rubiaceae; Loganiaceae; Buddlejaceae; Gelsemiaceae; Apocynaceae; Gentianaceae; Biologi; Biology; Biologi;

    Sammanfattning : This thesis deals with phylogenetic relationships at different taxonomic levels. All the plants studied are or have been included in the order Gentianales, which comprises about 17 200 species. LÄS MER