Sökning: "dark net"

Visar resultat 1 - 5 av 36 avhandlingar innehållade orden dark net.

  1. 1. Effects of enhanced ultraviolet-B radiation on subarctic ecosystems

    Författare :Carola Gehrke; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; pigmentation; photosynthesis; dark respiration; shoot morphology; shoot growth; phanerogams ; species composition cryptogams; productivity; decomposition; dwarf shrubs; bryophytes; peatland ecosystem; heath ecosystem; UV-B; ozone depletion; Plant ecology; Växtekologi;

    Sammanfattning : Biologically harmful ultraviolet-B radiation (UV-B, 280-320 nm) is increasing at the Earth´s surface owing to stratospheric ozone depletion. This is of global concern due to potential impacts of enhanced UV-B radiation on the biosphere. LÄS MER

  3. 2. Mechanisms of opiate tolerance and dependence in the rat

    Författare :Orsolya Hoffman; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Drug addiction is a complex phenomenon with various biological, psychological and social causes and consequences, which belongs to the major problems of today's society. Opiates have been used and misused for thousand of years and addiction to them develops both in humans and in animals. LÄS MER

  4. 3. Melatonin secretion and excretion : a clinical study focusing on factors and disease states which might influence melatonin

    Författare :Johan Wikner; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Melatonin; ethanol; Wernicke-Korsakoff syndrome; calcium; calcium channel blocker; verapamil; 6-sulphatoxy-melatonin; Obstructive Sleep Apnea Syndrome; Continuos Positive Airway Pressure; Fibromyalgic syndrome; TSH; somatostatin; octreotide; GH; Hypothyroidism;

    Sammanfattning : The overall aim of this thesis was to find out whether other factors than the the light-dark changes influence the function of the pineal gland. Since melatonin (MT) itself, or its precursor serotonin, are of importance for sleep, mood, and pain perception, disease states - or situations in which these functions are disturbed - should be of interest to investigate in this context. LÄS MER

  5. 4. Platelet serotonin function and personality traits in affective disorder

    Författare :Jolanta Neuger; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Serotonin; depression; panic disorder; platelets; personality; citalopram;

    Sammanfattning : Serotonin (5-HT, 5-hydroxytryptamine) is a neurotransmitter in the central nervous system which has been implicated m the aetiology and pathogenesis of affective disorders like depression and anxiety disorders. The serotonergic system has been shown to be involved in the modulation of mood, sleep, appetite, libido, energy and cognition and memory functions. LÄS MER

  7. 5. Urinary tract infections in pregnancy : studies in vivo and in vitro

    Författare :Musa Sekikubo; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : The risk of urinary tract infection (UTI) in pregnant women is increased and predisposes them to acute pyelonephritis together with poor pregnancy outcomes. Increased frequency of micturition, nocturia and lower abdominal discomfort are common non-specific complaints during pregnancy, which render clinical diagnosis of UTI inaccurate. LÄS MER