Sökning: "selenium"

Visar resultat 16 - 20 av 111 avhandlingar innehållade ordet selenium.

  1. 16. Regulation of apoptosis in the thyroid epithelium

    Författare :Abeba Demelash; Göteborgs universitet; []
    Nyckelord :Thyroid; Apoptosis; Caspase; Calpain; Hydrogen peroxide; TGF-beta; Staurosporine; Selenium; Cytochrome c;

    Sammanfattning : Apoptosis or programmed cell death allows the multicellular organism to remove cells that are in excess or potentially dangerous. Apoptosis has to be strictly controlled, yet inappropriately activated or suppressed apoptototic may contribute to a variety of diseases, including cancer, autoimmune disorders and neurodegenerative conditions. LÄS MER

  3. 17. Biomarkers of fish consumption and risk of stroke or myocardial infarction

    Författare :Maria Wennberg; Jan-Håkan Jansson; Ingvar Bergdahl; Maria Albin; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; fish consumption; omega-3 fatty acids; eicosapentaenoic acid; docosahexaenoic acid; methylmercury; selenium; lead; cadmium; stroke; myocardial infarction; erythrocytes; food frequency questionnaire; Environmental medicine; Miljömedicin; Epidemiology; epidemiologi; hälso- och sjukvårdsforskning; health services research; medicin; Medicine; Environmental Science; miljövetenskap; näringslära; Nutrition;

    Sammanfattning : The effect of fish consumption on the risk of cardiovascular disease has been extensively studied. Omega-3 fatty acids present in fish, namely eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), have been found to have beneficial effects through several mechanisms. In addition, selenium, an antioxidant, may be protective. LÄS MER

  4. 18. Exploring Catalytic Tellurium-Based Antioxidants : Synthesis and Evaluation

    Författare :Jia-fei Poon; Lars Engman; John Murphy; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; antioxidant; tellurium; selenium; radical-trapping; chain-breaking; ROS; glutathione peroxidase; tocopherol; aromatic amine; oxidative stress;

    Sammanfattning : This thesis is concerned with the synthesis and evaluation of various tellurium-based chain-breaking antioxidants. The purpose is to find novel regenerable compounds with improved radical-trapping capacity.In the first part of this work, we explore the possibilities to incorporate tellurium into tocopherols and aromatic amines. LÄS MER

  5. 19. Electronic and optical properties of conducting polymers from quantum mechanical computations

    Författare :Amina Mirsakiyeva; Anna Delin; Igor Zozoulenko; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; density functional theory; DFT; Car-Parrinello molecular dynamics; CPMD; tigh-binding; poly 3; 4-ethylenedioxythiophene ; PEDOT; selenium; PEDOS; tellurium; PEDOTe; poly p-phenylene ; poly para-phenylene ; poly 1; 4-phenylene ; naphthobischalcogenadiazoles; Fysik; Physics;

    Sammanfattning :     Conductive polymers are also known as "organic metals" due to their semiconducting properties. They are found in a wide range of applications in the field of organic electronics. However, the growing number of experimental works is not widely supported with theoretical calculations. LÄS MER

  7. 20. Selenium in mammalian thioredoxin reductase

    Författare :Liangwei Zhong; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Thioredoxin reductase (TrxR) is a major enzyme in regulating intracellular redox status. The enzyme from several mammalian tissues has been purified, showing higher molecular weight and a much broader substrate specificity than E. coli TrxR, but the structural basis of these properties remained unknown. LÄS MER