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Visar resultat 11 - 15 av 73 avhandlingar som matchar ovanstående sökkriterier.

  1. 11. Theoretical Modeling of Enzyme Catalysis with Focus on Radical Chemistry

    Författare :Vladimir Pelmenschikov; Per E. M. Siegbahn; Tim Clark; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; density functional theory; enzyme catalysis; radical chemistry; zinc-containing peptidase; methyl-coenzyme M reductase; ribonucleotide reductase; superoxide dismutase; Quantum chemistry; Kvantkemi;

    Sammanfattning : Hybrid density functional theory (DFT) B3LYP method is applied to study the four diverse enzyme systems: zinc-containing peptidases (thermolysin and stromelysin), methyl-coenzyme M reductase, ribonucleotide reductases (classes I and III), and superoxide dismutases (Cu,Zn- and Ni-dependent enzymes). Powerfull tools of modern quantum chemistry are used to address the questions of biological pathways at their molecular level, proposing a novel mechanism for methane production by methyl-coenzyme M reductase and providing additional insights into hydrolysis by zinc peptidases, substrate conversion by ribonucleotide reductases, and biological superoxide dismutation. LÄS MER

  3. 12. The hyperosmolar airway : Mechanisms of reduced response to nitric oxide

    Författare :Josephine Hjoberg; Uppsala universitet; []
    Nyckelord :Medical sciences; 8-Br-cyclic GMP; airway epithelium; airway reactivity; airway smooth muscle; amiloride; epithelium derived relaxing factor; furosemide; hyperosmolarity; hypertonic saline; nitric oxide; SNAP; sodium chloride; sodium nitroprusside; superoxide; tracheal perfusion; MEDICIN OCH VÅRD; MEDICINE; MEDICIN; Clinical Physiology; klinisk fysiologi;

    Sammanfattning : Inhaled nitric oxide (NO) relaxes smooth muscle of the airways and of pulmonary blood vessels and is used to treat lung diseases where the pulmonary vessels are constricted. NO has also been tested as a bronchodilator in asthmatic patients. LÄS MER

  4. 13. A radical view of haemoglobin - protein engineering and characterisation

    Författare :Marie Grey; Tillämpad biokemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; His-Gln tagging; protein purification; blood substitutes; radical scavenging; superoxide dismutase; E. coli; diglobin; Haemoglobin; protein engineering; aqueous two-phase systems; hydrophobic interaction chromatography;

    Sammanfattning : In recent years shortages of donated blood have become a growing problem for health care systems world-wide. Blood substitutes based on human haemoglobin (Hb) could potentially ameliorate this situation. However, clinical trials have indicated problems due to e.g. LÄS MER

  5. 14. Studies on effects of antioxidants on arterial thrombosis and endothelial cell injury : With special reference to Tocopherols and ApoA1 Milano

    Författare :Dayuan Li; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Surgery; tocopherols; apoA1 Milano; platelet aggregation; thrombosis; superoxide dismutase; nitric oxide synthase; endothelial cells; oxidized LDL; transcription factor; apoptosis; Kirurgi; Surgery; Kirurgi; rättsmedicin; Forensic Medicine;

    Sammanfattning : Coronary arterial endothelial injury and thrombosis are believed to be critical factors in the pathogenesis of coronary artery disease (CAD). Experimental studies have provided evidence for au inverse relation between acute coronary events and antioxidant intake. LÄS MER

  7. 15. Mutant superoxide dismutase-1-caused pathogenesis in amyotrophic lateral sclerosis

    Författare :Daniel Bergemalm; Stefan Marklund; Thomas Brännström; Peter Andersen; Caterina Bendotti; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; ALS; SOD1; mitochondria; proteome; transgenic mice; inclusion; Clinical chemistry; Klinisk kemi; biokemi; Biochemistry; neurologi; Neurology; Clinical Chemistry; klinisk kemi; patologi; Pathology;

    Sammanfattning : Amyotrophic lateral sclerosis (ALS) is a devastating disease that affects people in their late mid-life, with fatal outcome usually within a few years. The progressive degeneration of neurons responsible for muscle movement (motor neurons) throughout the central nervous system (CNS) leads to muscle wasting and paralysis, and eventually affects respiratory function. LÄS MER