Search for dissertations about: "early vertebrates"

Showing result 1 - 5 of 72 swedish dissertations containing the words early vertebrates.

  2. 1. Silurian vertebrates of Gotland (Sweden) and the Baltic Basin

    Author : Oskar Bremer; Henning Blom; Per E. Ahlberg; Tiiu Märss; Héctor Botella; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; early vertebrates; vertebrate microremains; scale taxonomy; early vertebrate distribution; environmental preferences; Silurian; Baltic Basin; Gotland; Sweden; Biology with specialization in Evolutionary Organismal Biology; Biologi med inriktning mot evolutionär organismbiologi;

    Abstract : During the Silurian, the Swedish island Gotland was positioned close to the equator and covered by a shallow sea called the Baltic Basin. The sedimentary rocks (predominantly carbonates) comprising most of the island today were initially formed in this warm sea, and the relatively complete succession of rocks often contains fossil fragments and scales from early vertebrates, including heterostracans, anaspids, thelodonts, osteostracans, acanthodians, and a stem-osteichthyan. READ MORE

  4. 2. Geology, stratigraphy, and fossil vertebrates of Gotland, Sweden : a review

    Author : Oskar Bremer; Henning Blom; Per Ahlberg; Märss Tiiu; Jan Ove Ebbestad; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Silurian; Gotland geology; Baltic Basin; extinction events; isotope excursions; atmospheric and oceanic cycles; early vertebrates; scale taxonomy; environmental preferences; vertebrate biozonation.; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Abstract : The Silurian limestones of Gotland, Sweden, and their exceptionally well-preserved fossils have attracted the interest of scientists for more than 200 years. The sedimentary rocks represent approximately 10 million years of time, and were deposited in a shallow, equatorial inland sea named the Baltic Basin. READ MORE

  5. 3. Evolution of the Neuropeptide Y System in Vertebrates with Focus on Fishes

    Author : Tomas Larsson; Dan Larhammar; Svante Winberg; Kenneth H. Wolfe; Uppsala universitet; []
    Keywords : Molecular biology; neuropeptide Y; GPCR; evolution; gene duplication; vertebrates; ray-finned fishes; Molekylärbiologi;

    Abstract : Gene families in vertebrates often contain more dulicates (paralogs) than in invertebrates. This has been attributed to genome duplications, i.e., tetraploidizations. READ MORE

  6. 4. Musculoskeletal Development in Jawed Vertebrates : Gene function, cis-regulation, and 3D phenotypes in zebrafish

    Author : Jake Leyhr; Tatjana Haitina; Sophie Sanchez; Per Ahlberg; Chrissy Hammond; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nkx3.2; Gdf5; Mkx; zebrafish; jaw joint; skeleton; fin development; cartilage; tendon; ligament; enhancer; CRISPR Cas9; mutant; microCT; synchrotron; Biology with specialization in Evolutionary Organismal Biology; Biologi med inriktning mot evolutionär organismbiologi;

    Abstract : Vertebrate skeletons are an intricate framework of bony and cartilaginous structures that form through carefully orchestrated developmental processes, guided by interacting genetic pathways that regulate cellular differentiation, migration, and tissue morphogenesis. The specific timing and localisation of gene expression shapes the diverse array of skeletal elements, from the flexible cartilages of the embryonic stage to the hardened bones that provide structural support in adulthood, and the joints and connective tissues that articulate the musculoskeletal system. READ MORE

  7. 5. Evolution of sex chromosomes in Sylvioidea songbirds

    Author : Hanna Sigeman; MEMEG; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Sex chromosome; neo-sex chromosome; Birds; vertebrates; Genomics; Bioinformatics;

    Abstract : Sex chromosomes were discovered more than 100 years ago. They have been studied intensely from a theoretical perspective since then, giving rise to a large body of testable predictions about their evolution from autosomes. READ MORE