Sökning: "skeletons"

Visar resultat 11 - 15 av 27 avhandlingar innehållade ordet skeletons.

  1. 11. Silurian-Devonian vertebrates from the Northern hemisphere

    Författare :Henning Blom; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap; Earth sciences; Geovetenskap; Historical Geology and Paleontology; historisk geologi och paleontologi;

    Sammanfattning : Microscopic remains of early vertebrates such as scales and dermal hone fragments are common in Silurian andDevonian rocks world wide. Although they only represent a small part of the whole animal they still provideimportant information about the organism and its evolution, ecology and distribution. LÄS MER

  3. 12. Fossil birds: Contributions to the understanding of avian evolution

    Författare :Johan Dalsätt; Otto Hermelin; Per Ericson; Zbigniew M. Bocheński; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; General and Historical Geology; allmän och historisk geologi;

    Sammanfattning : The study of the evolution of birds began about 150 years ago with the finding of Archaeopteryx. Yet, many unsolved questions about avian evolution remain to be answered. This thesis aims at addressing some of these questions.The Early Cretaceous Confusiusornis is the most well-represented Mesozoic bird in the fossil record. LÄS MER

  4. 13. De odödliga. Förhistoriska individer i vetenskap och media

    Författare :Katarina Nordström; Arkeologi; []
    Nyckelord :HUMANIORA; HUMANITIES; döden; dxponerade kroppar; exposed bodies; stenåldersskelett; Stone Age skeleton; mosslik; Bog bodies; vikingadrottning; strategier; Viking queen; Arkeologi; strategies; death; Archaeology;

    Sammanfattning : In the discipline of archaeology death has always been a common subject. Graves and dead bodies in different states of decay are important sources of information. This dissertation investigates how our relation to death can be mirrored through some of the better-known individuals from prehistory in Scandinavia. LÄS MER

  5. 14. Advances in Stereoselective Palladium(ΙΙ)-Catalyzed Oxidative Transformations of Allenes

    Författare :Daniels Posevins; Jan-Erling Bäckvall; Troels Skrydstrup; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Synthesis; Palladium Catalysis; Allenes; Biomimetic; Carbocyclization; Borylation; Carbonylation; Oxidation; Heterogeneous; organisk kemi; Organic Chemistry;

    Sammanfattning : Palladium(ΙΙ)-catalyzed carbon-carbon and carbon-heteroatom bond formation via selective C-H bond oxidation constitutes a step-economical and versatile approach towards complex target molecules. This thesis has been focused on the development of new selective palladium(ΙΙ)-catalyzed transformations of allenes under oxidative conditions catalyzed by either homogenous or heterogeneous palladium(ΙΙ) catalysts. LÄS MER

  7. 15. Organic Hole-Transport Materials for Perovskite Solar Cells

    Författare :Linqin Wang; Licheng Sun; Nam-Gyu Park; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hole-transport material; Photovoltaic device; Perovskite solar cell; Dopant-free; Carbazole; Spiro[fluorene-9; 9 -xanthene]; Small organic molecule; Crosslinked polymer; Solution-processed.; Kemi; Chemistry;

    Sammanfattning : Research on perovskite solar cells (PSCs) has undergone dramatic development since the first cells were reported in 2009, and the past decade has witnessed a significant breakthrough on their power conversion efficiencies (PCEs) from 3.8% to 25%. LÄS MER