Sökning: "carbonyl groups"

Visar resultat 11 - 15 av 38 avhandlingar innehållade orden carbonyl groups.

  1. 11. Synthesis of functional derivatives of [B12H12]2- anion for boron neutron capture therapy, radiodiagnostics and radioimmunotherapy

    Författare :Igor Sivaev; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi; Chemistry; Kemi; organisk kemi; Organic Chemistry;

    Sammanfattning : Functional derivatives of dodecahydro-closo-dodecaborate anion [B12H12]2- are potential candidates for medical application in boron neutron capture therapy for cancer and as linkers for the introduction of radiohalogen label into biomolecules for radioimmunodiagnostics and radioimmunotherapy.In this study, new approaches for the synthesis of functional derivatives of the closo-dodecaborate anion were developed and a series of novel functional derivatives were prepared. LÄS MER

  3. 12. 13C-Enriched Dehydrogenation Polymers Used for Studying Light-Induced Yellowing of Lignocellulosic Materials

    Författare :Jim Parkås; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lignin model compounds; differentiating xylem; yellowing; Picea abies; 13C NMR spectroscopy; lignin; DHP; 13C-enrichment; solid state; spruce;

    Sammanfattning : This study deals with the use of selectively 13C-enriched dehydrogenation polymers (DHPs) as models of lignin in lignocellulosic materials for elucidating the reaction pathways involved in light-induced yellowing. Methods for the synthesis of coniferin, a precursor to lignin and DHP, selectively 13C-enriched in the aromatic ring (positions 1, 3, 4, and 5) have been developed. LÄS MER

  4. 13. Ligniners reaktioner med alkalisk väteperoxid

    Författare :Roland Agnemo; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hydrogen Peroxide; Alkaline; Bleaching; Lignin Models;

    Sammanfattning : Under alkaline conditions hydrogen peroxide can be used either as a 1ignin-degrading or a 1ignin-preserving bleaching agent. If heavy metal ions are present and/or silicate is absent in the reaction medium, hydrogen peroxide decomposes via hydroxyl radicals and superoxide ions to oxygen and water. LÄS MER

  5. 14. Development of Mild Methods for Selective Covalent Functionalization of Graphene

    Författare :Anna Lundstedt; Grennberg Helena; Bo Wegge Laursen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polycyclic aromatic hydrocarbons; graphene models; graphite; local ionization energy surfaces; graphene functionalization; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Sammanfattning : This thesis discusses methods for the comparatively mild covalent functionalization of graphene. Several graphene models were investigated: polycyclic aromatic hydrocarbons (PAHs), chemical vapor deposition (CVD)-graphene on SiO2/Si substrate, graphite foil, graphite flakes, kish graphite and highly oriented pyrolytic graphite. LÄS MER

  7. 15. Development of advanced chemical biology tools for microbiome metabolism : Chemoselective probes for enhanced metabolomics analysis

    Författare :Weifeng Lin; Daniel Globisch; Frank Schroeder; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Chemical biology; Chemoselective modification; Chemical metabolomics; Bioorganic; Microbiome metabolism; Kemi; Chemistry;

    Sammanfattning : The human microbiome has a profound impact on host physiology by generating highly reactive compounds that can contribute to the development of diseases. These microbial metabolites have a substantial potential that can serve as valuable indicators or biomarkers for different health conditions. LÄS MER