Sökning: "family trees"

Visar resultat 1 - 5 av 42 avhandlingar innehållade orden family trees.

  1. 1. Trees of Knowledge : Science and the Shape of Genealogy

    Författare :Petter Hellström; H. Otto Sibum; Jenny Beckman; Hanna Hodacs; John Tresch; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; cultural history of science; science and metaphor; science and visual representation; family trees; tree diagrams; information management; classification; natural history; philology; music theory; genealogy; evolution; secularisation; Enlightenment; French Revolution; Augustin Augier 1758–1825 ; Félix Gallet 1773–c. 1840 47 ; Henri Montan Berton 1767–1844 .; History of Sciences and Ideas; Idé- och lärdomshistoria;

    Sammanfattning : This study investigates early employments of family trees in the modern sciences, in order to historicise their iconic status and now established uses, notably in evolutionary biology and linguistics. Moving beyond disciplinary accounts to consider the wider cultural background, it examines how early uses within the sciences transformed family trees as a format of visual representation, as well as the meanings invested in them. LÄS MER

  3. 2. Optimization beyond a single submodular function : Submodular optimization for ranking, decision trees and diversity

    Författare :Guangyi Zhang; Aristides Gionis; Danupon Na Nongkai; Parinya Chalermsook; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Submodular optimization; Approximation algorithms; Ranking; Decision trees; Diversity; Datalogi; Computer Science;

    Sammanfattning : Submodular functions characterize mathematically the ubiquitous ``diminishing-returns'’ property. They are widely used to describe core subjects in numerous applications, including economic utility, redundancy in information, spread of influence in social networks, and more. LÄS MER

  4. 3. Phylogeny and topological incongruence in the Rubioideae (Rubiaceae)

    Författare :Olle Thureborn; Catarina Rydin; Sylvain G. Razafimandimbison; Niklas Wikström; Michael D. Pirie; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Anthospermeae; cytonuclear discordance; gene trees; incomplete lineage sorting; incongruence; mitochondrial genome; nuclear genome; phylogenomics; phylogeny; plastid genome; Rubiaceae; Rubioideae; species trees; Plant Systematics; växtsystematik;

    Sammanfattning : The work with this thesis has focused on evolutionary relationships in the Rubioideae, the most species-rich subfamily of the large and diverse coffee family (Rubiaceae). Despite considerable efforts during the last decades, uncertainty regarding several relationships in this group has remained, either as a result of unconvincing statistic support, incongruent results, or insufficient taxon sampling. LÄS MER

  5. 4. Reconciling gene family evolution and species evolution

    Författare :Joel Sjöstrand; Jens Lagergren; Nicolas Lartillot; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computational biology; Bioinformatics; Phylogenetics; Phylogenomics; Comparative genomics; Evolutionary biology; datalogi; Computer Science;

    Sammanfattning : Species evolution can often be adequately described with a phylogenetic tree. Interestingly, this is the case also for the evolution of homologous genes; a gene in an ancestral species may – through gene duplication, gene loss, lateral gene transfer (LGT), and speciation events – give rise to a gene family distributed across contemporaneous species. LÄS MER

  7. 5. Taking advantage of phylogenetic trees in comparative genomics

    Författare :Örjan Åkerborg; Jens Lagergren; Mathieu Blanchette; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer Science; Bioinformatics; Bioinformatik;

    Sammanfattning : Phylogenomics can be regarded as evolution and genomics in co-operation. Various kinds of evolutionary studies, gene family analysis among them, demand access to genome-scale datasets. But it is also clear that many genomics studies, such as assignment of gene function, are much improved by evolutionary analysis. LÄS MER