Sökning: "enzym"

Visar resultat 1 - 5 av 219 avhandlingar innehållade ordet enzym.

  1. 1. Dynamic Chemistry for Asymmetric Synthesis, Molecular Motion and Constitutional Exchange

    Författare :Yansong REN; Licheng Sun; Olof Ramström; Anna Hirsch; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dynamic chemistry; constitutional dynamic chemistry; motional dynamics; dynamic kinetic resolution; enzyme; subtilisin Carlsberg; Candida antarctica lipase B; anti-HIV; 1; 3-oxathiolane; dynamic exchange; enamines; E Z-isomerization; molecular switches; aggregation; gelation; fluorescence.; dynamisk kemi; konstitutionell dynamisk kemi; molekylär rörelsedynamik; dynamisk kinetisk resolvering; enzym; subtilisin Carlsberg; Candida antarctica lipase B; anti-HIV; 1; 3-oxatiolan; dynamisk utbyte; enaminer; E Z-isomerisering; molekylära omkopplare; aggregering; gelbildning; fluorescens.; Kemi; Chemistry;

    Sammanfattning : Living matter is built on complex dynamic systems consisting of numerus biotransformations. By exploiting the adaptive and evolutive behaviors ofmolecular matter, dynamic chemistry has developed as an important tool tounderstand the organization of nonliving matter into complex living systems. LÄS MER

  3. 2. The xanthophyll cycle, its enzymes, pigments and regulation

    Författare :Marie Eskling Carlsson; Biokemi och Strukturbiologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; zeaxanthin; xanthophyll cycle; violaxanthin de-epoxidase; thylakoid; spinach; regulation; purification; pigments; photoprotection; pH dependence; ascorbate; light stress; Plant biochemistry; Växtbiokemi;

    Sammanfattning : The xanthophyll cycle involves the light-dependent and reversible conversion of violaxanthin to zeaxanthin. Zeaxanthin has been implicated in the protection of the photosynthetic machinery from over-excitation. The enzyme violaxanthin de-epoxidase catalyses the conversion of violaxanthin to zeaxanthin. LÄS MER

  4. 3. Investigations of New Biomimetic Transamination Systems and Inclusion Complexation with Cyclodextrins

    Författare :Anders Hjelmencrantz; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stereochemis; bicyclooctanes.Transamination; complexation; cyclodextrins; proton transfer; hydride transfer; stereochemistry; Transamination; Organic chemistry; Organisk kemi;

    Sammanfattning : Two new transamination systems are described. The first example is a dibenzo[a,d]- cycloheptene containing system, designed to accomplish a [1,3]-hydride transfer. Several catalysts have been examined for this purpose. tris-Pentafluorophenyl borane was found to be the most efficient catalyst. LÄS MER

  5. 4. Structural and biochemical insights into biosynthesis and degradation of N-glycans

    Författare :Tom Reichenbach; Christina Divne; David Drew; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; N-glycan; biosynthesis; degradation; glycosyltransferase; glycoside hydrolase; biofuel; enzyme; membrane protein; Bioteknologi; Biotechnology;

    Sammanfattning : Carbohydrates are a primary energy source for all living organisms, but importantly, they also participate in a number of life-sustaining biological processes, e.g. cell signaling and cell-wall synthesis. The first part of the thesis examines glycosyltransferases that play a crucial role in the biosynthesis of N-glycans. LÄS MER

  7. 5. Enzyme-Based Amperometric Biosensors in Flow-Systems for Biomolecule Detection

    Författare :Niklas Larsson; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Microdialysis; Liquid chromatography; Flow injection; Polyelectrolytes; Carbohydrate; Mediator; Dehydrogenase; Peroxidase; Oxidase; Enzyme; Amperometric detection; Carbon paste; Biosensor; Graphite electrode; On-line monitoring; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Amperometric enzyme based biosensors were designed, developed and characterised in flow systems. Solid graphite and carbon paste electrodes were used as support for enzyme immobilisation. Both mediated and direct electron transfers between redox enzymes and electrodes were utilised for biosensor construction, as well as coupled enzyme systems. LÄS MER