Sökning: "Cnidaria"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet Cnidaria.

  1. 1. Evolution of eyes: Pax, gene duplications & morphology

    Författare :Karin Nordström; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; animal morphology; Djurs anatomi och morfologi; Animal anatomy; tetraploidization; planula; phototransduction; pax; paired domain; mutagenesis; cnidaria; eye evolution;

    Sammanfattning : During the course of evolution animal complexity and diversity is generated. The last couple of years it has become increasingly clear that morphologically diverse animals share a great deal of their genomic contents, and it must be the expression of regulatory genes in new setting, rather than the generation of new genes, that are fundamental for the generation of diversity. LÄS MER

  3. 2. Visual filtering in box jellyfish: A simple system

    Författare :Megan O'Connor; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Tripedalia cystophora; box jellyfish; Cnidaria; Chiropsella bronzie; visual filtering; visual systems; microspectrophotometry; vision; eyes;

    Sammanfattning : Unlike most jellyfish, box jellyfish (cubomedusae) are highly visually orientated. They are agile swimmers and use visual information to avoid obstacles and orientate themselves. LÄS MER

  4. 3. The nervous system of box jellyfish: A surprisingly complex system in a simple animal

    Författare :Linda Parkefelt; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; proliferating cell nuclear antigen; arginine vasotocin; RFamide; immunofluorescence; visual system; nervous system; Tripedalia cystophora; Cnidaria; box jellyfish;

    Sammanfattning : The four surprisingly complex visual sensory organs of cubomedusae, the rhopalia, contain each six eyes of four morphologically different types, two of which are camera-type eyes. This means that the evolutionary basal nervous system of cubomedusae must process the visual signals received from a total of 24 rhopalial eyes. LÄS MER

  5. 4. Taxonomy of Scandinavian hydroids (Cnidaria, Campanulariidae) : a study based on nematocyst morphology and isoenzymes

    Författare :Carina Östman; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  7. 5. Control of bioluminescence. Operating the light switch in photophores from marine animals

    Författare :Jenny Krönström; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bioluminescence; physiological control; nitric oxide; krill; fish;

    Sammanfattning : Physiologically controlled photocytes, capable of producing bioluminescence, are a common feature in the ocean among animals ranging from cnidarians to fish. The aim of this thesis was to study and compare the nature of this control, in both distantly and closely related species from the groups Teleostei Crustacea, and Cnidaria. LÄS MER