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Showing result 1 - 5 of 17 swedish dissertations matching the above criteria.

  2. 1. Environmentally Degradable Polyethylene : Effects of Additives and Environment on the Degradation and Degradation products

    Author : Farideh Khabbaz; KTH; []
    Keywords : LDPE; polyethylene; oxidative degradation; photo-oxidation; thermo-oxidation; degradation products; photosensitisers; pro-oxidant; starch; master-batch; gas chromatography mass-spectrometry; GC-MS; solid phase microextraction; SPME;

    Abstract : This thesis summarises and compares the influences ofdifferent additives (photosensitisers, pro-oxidants, abiodegradable filler) on blown low-density polyethylene (LDPE)films during photo- and thermal degradation with respect tochemical changes in the polymer matrices and identifieddegradation products. Additives studied were irondimethyldithiocarbamate (FeDMC), nickel dibutyldithocarbamate(NiDBC), carbon black, starch, a pro-oxidant that consisted ofmanganese stearate together with styrene butadiene rubber (SBR)or natural rubber (NR) and a master batch containing linearLDPE, starch and pro-oxidant. READ MORE

  4. 2. The paradox of micronutrients : in vitro and human studies

    Author : Therese Woodhill; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Many essential micronutrients found in fruits and vegetables exhibit antioxidant properties, protecting against oxidation and oxidative stress. Their ability to react with electrons also enables them to act as pro-oxidants, causing damage opposed to preventing it. READ MORE

  5. 3. Influence of the degradation mechanism on the molecular weight changes for some degradable polymers

    Author : Bengt Erlandsson; KTH; []
    Keywords : ;

    Abstract : The influence of degradation mechanism on molecular weightchanges was investigated for certain degradable polymers. Thepolymers investigated were modified low density polyethylene(LDPE), poly(ethylene-co-vinyl alcohol) (EVOH) and aliphatic polyesters. READ MORE

  6. 4. Gene environment-interaction and cardiovascular phenotype in obesity and diabetes

    Author : Shafaat Hussain; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Although a large body of evidence supports the notion that genes determine cardio-metabolic traits and outcomes, the non-genetic regulation of these events has recently gained increasing attention. Plastic chemical modifications of DNA-histone complexes defined epigenetic changes regulate gene expression by modifying chromatin accessibility to transcription factors. READ MORE

  7. 5. From Proteomic Analysis to Biomarker Application - Studies of Carbonyl Reductase in Fish

    Author : Eva Albertsson; Göteborgs universitet; []
    Keywords : Fish; Proteomics; Biomarker; Carbonyl Reductase; AhR agonists; Oxidative stress; Biomonitoring;

    Abstract : Many anthropogenic substances are present in the aquatic environment, but there is limited information on how this combination of chemicals affects exposed wildlife. To assess the impact of chemicals, a biomarker approach is frequently applied in environmental biomonitoring programmes. READ MORE