Sökning: "free radicals"

Visar resultat 1 - 5 av 181 avhandlingar innehållade orden free 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. Using de novo design proteins to explore tyrosine radicals and cation-π interactions

    Detta är en avhandling från Stockholm : Department of Biochemistry and Biophysics, Stockholm University

    Författare :Bruce W. Berry; Stockholms universitet.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; tyrosine; radicals; cation-pi interactions; de novo designed proteins; biochemistry; biophysics; biokemi; Biochemistry;

    Sammanfattning : Redox cofactors and amino-acid free radicals play important roles in biology. Although many of the same cofactors and amino acids that form these radicals are found across a broad range of biological systems, identical cofactors can have different reduction potentials. The local environment plays a role in defining these redox potentials. LÄS MER

  3. 3. Mechanisms of alloxan diabetogenicity

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Kjell Grankvist; Umeå universitet.; [1981]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Alloxan; catalase; experimental diabetes; free radicals; islets of Langerhans; rubidium accumulation; superoxide dismutase; Trypan Blue;

    Sammanfattning : Suspensions of pancreatic islet cells from ob/ob-mice were incubated with Trypan Blue. Microscope photometry showed that apparently viable cells excluded the dye completely, whereas the nuclei of non-viable cells accumulated Trypan Blue by a saturable process. LÄS MER

  4. 4. 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

  5. 5. 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