Sökning: "Terpenes"

Visar resultat 1 - 5 av 37 avhandlingar innehållade ordet Terpenes.

1. 1. Clinical and experimental studies on oxidized fragrance terpenes as contact allergens

   Författare :Johanna Bråred Christensson; Göteborgs universitet; []
   Nyckelord :autoxidation; contact allergy; limonene; linalool; colophonium; limonene-1-hydroperoxide; limonene-2-hydroperoxide; 15-hydroperoxyabietic acid; 15-HPA; terpenes; local lymph node assay; LLNA; Freunds complete adjuvant test; FCAT; patch testing; laser Doppler imaging; skin irritation; visual reading;

   Sammanfattning : The work presented in this thesis aims to improve the possibilities for diagnosing contact allergy to oxidized limonene and linalool and to, in patients, study contact allergy from structurally closely related hydroperoxides with regard to their specificity, potency and cross-reactivity. The fragrance terpenes limonene (from citrus oil) and linalool (from lavender oil) are widely used in household and industrial products. LÄS MER

3. 2. Allergenic Oxidation Products from Fragrance Terpenes. Chemical Analysis and Determination of Sensitizing Potency

   Författare :Johanna Rudbäck; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Autoxidation; Contact allergy; Essential oils; Fragrances; Hydroperoxides; Ionization techniques; Mass spectrometry; Prehapten; Sensitization; Skin; Structure-activity relationships; Terpenes;

   Sammanfattning : The ubiquitous presence of fragrance compounds in consumer products has resulted in a high frequency of contact allergy to fragrances in the population. For prevention purposes and according to EU regulations, cosmetics must be labeled when containing the most prominent fragrance allergens in concentrations exceeding 0. LÄS MER

4. 3. Emissions of volatile organic compounds from wood

   Författare :Karin Granström; Bengt Månsson; Ann-Margret Strömvall; Karlstads universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VOC; terpenes; drying; wood; emissions; spouted bed; Environmental engineering; Miljöteknik; Miljö- och energisystem; Environmental and Energy Systems;

   Sammanfattning : The central aim of this thesis is to support the efforts to counteract certain environmental problems caused by emissions of volatile organic compounds. The purpose of this work was (1) to develop a method to establish the amount of emitted substances from dryers, (2) to determine the effect of drying medium temperature and end moisture content of the processed material on emissions of monoterpenes and other hydrocarbons, (3) to examine the emissions of monoterpenes during production of pellets, and (4) to examine the natural emissions from forests with an eye to implications for modelling. LÄS MER

5. 4. Biomass Pre-treatment for the Production of Sustainable Energy : Emissions and Self-ignition

   Författare :Katarina Rupar-Gadd; Mehri Sanati; Evert Ljungström; Växjö universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; terpenes; SPME; biomass; pellets; self-ignition; storage; drying; calorimetry; Chemical engineering; Kemiteknik; Bioteknik; Biotechnology;

   Sammanfattning : Organic emissions with focus on terpenes, from biomass drying and storage were investigated by Solid Phase Microextraction (SPME) and GC-FID and GC-MS. The remaining terpenes in the biomass (Spruce and pine wood chips) after drying were dependant on the drying temperature and drying medium used. LÄS MER

7. 5. Conifer chemical defense : Rugulation of bark beetle colonization and pheromone emission

   Författare :Tao Zhao; Anna-Karin Borg-Karlson; Irena Valterova; KTH; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Picea abies; Ips typographus; Ceratocystis polonica; methyl jasmonate; windstorm; stress response; terpenes; phenols; colonization; pheromone emission; Plant and forest protection; Växt- och skogsskydd;

   Sammanfattning : Terpenes and phenols are of importance in conifer defense against insects and pathogens. Knowledge about tree chemical defense is vital for developing practical methods to maintain healthy forests. LÄS MER