Sökning: "Organismbiologi"

Visar resultat 21 - 25 av 38 avhandlingar innehållade ordet Organismbiologi.

  1. 21. Three-dimensional Virtual Histology of Early Vertebrate Scales Revealed by Synchrotron X-ray Phase-contrast Microtomography

    Författare :Qingming Qu; Per Ahlberg; Henning Blom; Moya Smith; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 3D virtual paleohistology; scales; ontogeny; jawed vertebrates; phylogeny; Biology; Biologi; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Sammanfattning : Vertebrate hard tissues first appeared in the dermal skeletons of early jawless vertebrates (ostracoderms) and were further modified in the earliest jawed vertebrates. Fortunately, histological information is usually preserved in these early vertebrate fossils and has thus been studied for more than a century, done so by examining thin sections, which provide general information about the specific features of vertebrate hard tissues in their earliest forms. LÄS MER

  3. 22. Who ate whom? Paleoecology revealed through synchrotron microtomography of coprolites (fossil feces)

    Författare :Martin Qvarnström; Živilė Žigaitė; Grzegorz Niedźwiedzki; Per Ahlberg; Karen Chin; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; coprolites; paleoecology; synchrotron microtomography; taphonomy; Triassic; Biologi; Biology;

    Sammanfattning : Fossil droppings, known as coprolites, are being increasingly recognized as a valuable source of paleoecological information with special regard to diets, parasitism, and physiology of extinct taxa. Here, it is suggested that the excellent preservation and amount of inclusions in the coprolites (e.g. LÄS MER

  4. 23. Markets, mixtures and molecular methods : Investigating medicinal plant and edible orchid diversity in Tanzania and Zambia

    Författare :Sarina Veldman; Hugo J. de Boer; Tinde R. van Andel; Barbara Gravendeel; Joseph N. Otieno; Julie Hawkins; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; DNA barcoding; Africa; Species delimitation; Orchids; Medicinal plants;

    Sammanfattning : Medicinal plants are an important source of primary healthcare for many people in Tanzania. These medicinal plants are harvested from the wild, and increasing commercial trade poses a serious threat to local plant populations. Currently it is unknown which species are traded and in what amounts. LÄS MER

  5. 24. The role of Nkx3.2 and Gdf5 during zebrafish skeletal development

    Författare :Laura Waldmann; Tatjana Haitina; Abigail Tucker; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nkx3.2; Gdf5; zebrafish; jaw joint; joints; axial skeleton; appendicular skeleton; fin; enhancer conservation; CRISPR Cas9; OPT;

    Sammanfattning : The vertebrate skeleton is composed of bony and cartilaginous structures that are developed under the control of numerous genetic networks. The transcription factor Nkx3. LÄS MER

  7. 25. Cooperativity in muscle proteins : a study of actin filaments and myosin II

    Författare :Elina Bengtsson; Alf Månsson; Sven Tågerud; Ann-Christin Koch-Schmidt; Georgios Tsiavaliaris; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cell and Organism Biology; Cell- och organismbiologi;

    Sammanfattning : .... LÄS MER