Sökning: "senescence"

Visar resultat 1 - 5 av 144 avhandlingar innehållade ordet senescence.

  1. 1. Regulatory Control of Autumn Senescence in Populus tremula

    Författare :Edlund Erik; Stefan Jansson; Paul Dijkwel; Umeå universitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Aspens; Girdling; Anthocyanins; Arginine; Autumn Senescence; Cytokinins; Populus tremula; Asp; Ringbarkning; Antocyanin; Arginin; Höstlöv; Cytokinin; Populus tremula; Physiological Botany; fysiologisk botanik;

    Sammanfattning : Autumn senescence is a visually spectacular phenomenon in which trees prepare for the oncoming winter. The mechanism for regulation of autumn senescence in trees has been very hard to pinpoint. In this thesis the main focus is to investigate how autumn senescence is regulated in aspens (Populus tremula). LÄS MER

  3. 2. To “leaf” or not to “leaf” : Understanding the metabolic adjustments associated with leaf senescence

    Författare :Daria Chrobok; Olivier Keech; Per Gardeström; David Macherel; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis thaliana; metabolism; mitochondria; senescence; biology; biologi;

    Sammanfattning : The adequate execution of the final developmental stage of a leaf, leaf senescence, is crucial to the long-term survival of the plant. During senescence cellular structures like membranes, proteins, lipids and macromolecules are degraded and released nutrients are relocated to developing parts of the plant, such as young leaves, stems, flowers, siliques and ultimately seeds that are dependent on this nutrient remobilization. LÄS MER

  4. 3. Liposarcomas - proliferation, senescence and the role of DDIT3

    Författare :Christina Kåbjörn-Gustafsson; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Liposarcoma; FUS-DDIT3; TP53; senescence;

    Sammanfattning : Lipomatous tumors comprise benign and malignant forms called lipomas and liposarcomas. Myxoid/round cell liposarcoma (MLS/RCLS) is the second most common liposarcoma and is characterized by the fusion oncogenes FUS-DDIT3 or EWSR1-DDIT3. LÄS MER

  5. 4. Shedding Light on Shade- and Dark-Induced Leaf Senescence

    Författare :Bastiaan Brouwer; Per Gardeström; Karin Krupinska; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis; darkness; light; photosynthesis; phytochrome; shade; senescence;

    Sammanfattning : Leaf senescence is the final stage of leaf development, during which the leaf relocates most of itsvaluable nutrients to developing or storing parts of the plant. As this process progresses, leaves losetheir green color and their capacity to perform photosynthesis. LÄS MER

  7. 5. Short and long-term effects of exposure to low dose and low dose rate of gamma radiation : using in vitro and in vivo models

    Författare :Traimate Sangsuwan; Siamak Haghdoost; Eva Forssell-Aronsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Low dose; Low dose rate; High dose rate; Ionizing radiation; Adaptive response; Senescence; Premature senescence; Oxidative stress; Drosophila embryo; Mutation; DNA repair; molekylär biovetenskap; Molecular Bioscience;

    Sammanfattning : Assessment of human health risks from exposure to ionizing radiation (IR) is mainly based on the extrapolation of results from epidemiological studies on populations exposed to relatively high doses and often at high dose rates (HDR). Risk estimates after exposure to low doses and in particular at low dose rates (LDR) remain controversial due to a lack of epidemiological evidence. LÄS MER