Sökning: "hydroxy acids"

Visar resultat 1 - 5 av 59 avhandlingar innehållade orden hydroxy acids.

  1. 1. Gas chromatography - mass spectrometry of sugars and related hydroxy acids as trimethylsilyl derivatives

    Författare :Göran Petersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mass spectrometry; hydroxy acids; gas chromatography; pulping; monosaccharides;

    Sammanfattning : The application of gas chromatography and mass spectrometry has contributed to the rapid progressof carbohydrate chemistry during the past ten years. Themethods are indispensable tools in current research oncarbohydrate reactions during pulping processes. LÄS MER

  3. 2. Structural studies on some α-hydroxy carboxylic acids

    Författare :Staffan Vallén; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  4. 3. Studies on nucleic acids chemistry

    Författare :Nitin Puri; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bioorganic chemistry; Bioorganisk kemi; Bioorganic chemistry; Bioorganisk kemi; bioorganisk kemi; Biorganic Chemistry;

    Sammanfattning : This thesis is divided into three parts: Part 1: Synthesis and conformational analysis of cyclic RNAs, and comparison with lariat RNAs modelling the lariat formed during processing of Group II and Nuclear pre-mRNA. Synthesis of a hexameric lariat RNA model with a tetranucleotidyl "2' → 5' loop" and a dinucleotidyl "3'-tail" has been accomplished. LÄS MER

  5. 4. Asymmetric Synthesis of C-Glycosylated Amino Acids : Incorporation in Collagen Glycopeptides and Evaluation in a Model for Rheumatoid Arthritis

    Författare :Tomas Gustafsson; Jan Kihlberg; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Total synthesis; stereoselective synthesis; chiral glycine templates; Evan’s alkylation; asymmetric hydrogenation; alpha-amino acid synthesis; C-glycoside; rheumatoid arthritis; MHC; T cell; Organic chemistry; Organisk kemi;

    Sammanfattning : This thesis describes stereoselective syntheses of four amino acids, three of which are C-glycosidic analogues of glycosylated amino acids. The overall goal of the project was to probe the interactions between MHC molecules, glycopeptide antigens and T cell receptors, that are essential for development of collagen induced arthritis. LÄS MER

  7. 5. On the role of cytochrome P450 3A4 in the metabolism of cholesterol and bile acids

    Författare :Karl Bodin; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Oxysterols; 4beta-hydroxycholesterol; 1beta-hydroxylated bile acids; 22hydroxylated bile acids; 3-oxo bile acids; gas chromatography-mass spectrometry;

    Sammanfattning : The origin of 4beta-hydroxycholesterol, a major oxysterol in human circulation, has previously been unknown. In this thesis, the formation and elimination of this compound are investigated by various techniques. The biological effects of 4beta-hydroxycholesterol are also discussed. LÄS MER