Sökning: "free oxygen radicals"

Visar resultat 1 - 5 av 83 avhandlingar innehållade orden free oxygen radicals.

  1. 1. Free radical mediated cellulose degradation

    Detta är en avhandling från Stockholm : Kemi

    Författare :Erik Johansson; KTH.; [2003]
    Nyckelord :free radicals; cellulose; polymer; average chain length; bleaching; TCF; ozone; degradation;

    Sammanfattning : This thesis addresses the mechanisms involved in cellulosedegradation in general and Totally Chlorine Free (TCF) bleachingof pulp in particular. The thesis shows that the cellulosedegradation during high consistency ozone bleaching is explainedby free radical chain reactions. LÄS MER

  2. 2. Effects of Th-1 and Th-2 Cytokines and Reactive Oxygen Species on Normal Human Bronchial Epithelial Cells

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Caroline Kampf; Uppsala universitet.; [2001]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Cell biology; ytokines; desmosomes; focal adhesions; free radicals; hypochlorous acid; nitric oxide; normal human bronchial epithelial cells; Cellbiologi; MEDICINE Morphology; cell biology; pathology Cell biology; MEDICIN Morfologi; cellbiologi; patologi Cellbiologi; medicinsk cellbiologi; Medical Cell Biology;

    Sammanfattning : Epithelial damage and shedding of the epithelium are common observations in many airway diseases such as asthma, Sjögren’s syndrome, chronic obstructive pulmonary disease and cystic fibrosis. The ability of the cells to attach to each other and/or to the matrix seems to be altered. LÄS MER

  3. 3. Application of Laser Techniques for Combustion Studies

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Marcus Aldén; Lunds universitet.; Lund University.; [1983]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Keywords: Laser-induced fluorescence; Raman Spectroscopy; Coherent anti-Stokes Raman Scattering CARS ; flames; laserspectroscopy; dye laser; lidar; remote sensing; combustion; air pollution; radicals; optical multichannel analyzer.;

    Sammanfattning : The aim for this work has been to increase the applicability of laser spectroscopy techniques for studies of combustion processes, both what regards in-flame experiments, exhaust-gas analysis and remote sensing of the atmosphere. Raman spectroscopy has been used for analysis of exhaust gases from flames, model fires of wood and for inflame measurements. LÄS MER

  4. 4. Photoinitiated Radical Carbonylation Using [11C]Carbon Monoxide 11C-Labelling of Aliphatic Carboxylic Acids, Esters, and Amides

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Oleksiy Itsenko; Uppsala universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; 11C-labelling; radicals; carbonylation; carbon monoxide; solvent effects; sensitizers; sulfoxides; WAY-100635; PET; Organisk kemi; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi;

    Sammanfattning : One-step photoinitiated free radical carbonylation was employed for the rapid (5–7 min) labelling of aliphatic carboxylic acids, esters, and amides with a short-lived positron emitter 11C (t½ = 20.3 min) at the carbonyl position. The labelled compounds were synthesized from alkyl iodides (0.05–0. LÄS MER

  5. 5. Oxidative stress, antioxidative defence and outcome of gestation in experimental diabetic pregnancy

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Jonas Cederberg; Uppsala universitet.; [2001]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Cell biology; Diabetes; pregnancy; rat; ROS; free oxygen radicals; TBARS; isoprostanes; protein carbonyls; embryo; vitamin C; vitamin E; Cellbiologi; MEDICINE Morphology; cell biology; pathology Cell biology; MEDICIN Morfologi; cellbiologi; patologi Cellbiologi; medicinsk cellbiologi; Medical Cell Biology;

    Sammanfattning : Maternal type 1 diabetes is associated with an increased risk for foetal malformations. The mechanism by which diabetes is teratogenic is not fully known. Previous studies have demonstrated that radical oxygen species can contribute to the teratogenicity of glucose and diabetes. LÄS MER