Search for dissertations about: "xylitol"

Showing result 1 - 5 of 22 swedish dissertations containing the word xylitol.

2. 1. Xylitol and its effect on oral ecology : clinical studies in children and adolescents

   Author : Pernilla Lif Holgerson; Svante Twetman; Christina Stecksén-Blicks; Eva Söderling; Umeå universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; chewing gum; dental plaque; dose-response relationship; interdental plaque-pH; oral microorganisms; saliva; xylitol; Paedodontics; Pedodonti;

   Abstract : Xylitol, classified as a natural sugar substitute, has for about 35 years been known as an agent that may act against caries. The mechanism of action; how it inhibits mutans streptococci (MS) and the clinical dose-response relationship are not however fully investigated. READ MORE

4. 2. Redox balancing in recombinant strains of Saccharomyces cerevisiae

   Author : Mikael Anderlund; Teknisk mikrobiologi; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; xylose isomerase; xylitol dehydrogenase; xylose reductase; glycerol; xylitol; xylose; E. coli; A. vinelandii; T. thermophilus; S. cerevisiae; P. stipitis; transhydrogenase.; Microbiology; bacteriology; virology; mycology; Mikrobiologi; bakteriologi; virologi; mykologi;

   Abstract : In metabolically engineered Saccharomyces cerevisiae expressing Pichia stipitis XYL1 and XYL2 genes, encoding xylose reductase (XR) and xylitol dehydrogenase (XDH), respectively, xylitol is excreted as the major product during anaerobic xylose fermentation and only low yields of ethanol are produced. This has been interpreted as a result of the dual cofactor dependence of XR and the exclusive use of NAD+ by XDH. READ MORE

5. 3. Physiological Engineering of Xylose Utilisation by Recombinant Saccharomyces cerevisiae

   Author : Nina Quednau Meinander; Teknisk mikrobiologi; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; protein burden; physiology; fed-batch fermentation; chemostat; recombinant Saccharomyces cerevisiae; ethanol; xylose; xylitol; Microbiology; bacteriology; virology; mycology; Mikrobiologi; bakteriologi; virologi; mykologi;

   Abstract : Xylitol production by recombinant, XYL1-expressing Saccharomyces cerevisiae was investigated in fed-batch fermentation using different cosubstrates for growth, and generation of reduced cofactors and maintenance energy. Xylose was converted into xylitol with 1:1 yield. READ MORE

6. 4. Bioactive Carbohydrates in Vining Peas (Pisum sativum) - Variation in alpha-galactoside content and the colonic fermentation of sugar alcohols

   Author : Jimmy Ekvall; Avdelningen för livsmedel och läkemedel; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; alpha-galactosides; raffinose family oligosaccharides; Näringslära; Nutrition; short-chain fatty acids; colonic fermentation; myo-inositol; sorbitol; xylitol; sugar alcohols; blanching; maturity; cultivar; Pisum sativum;

   Abstract : The composition of the colonic microflora is essential for the health of the human host. To be able to survive, the microflora is dependent of a continuous supply of substrate. In this respect dietary fibre and other indigestible carbohydrates, of which the consumption in affluent societies is generally low, are of great importance. READ MORE

7. 5. Trametes versicolor as biodegrader and biocatalyst when using lignocellulose for ethanol production

   Author : Marie Holmgren; Anita Sellstedt; Mohammad Taherzadeh; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lignocellulose; 5-carbon; 6-carbon; Trametes versicolor; xylose reductase; xylitol dehydrogenase; xylulokinase; phenolics; levulinic acid; HMF; furfural; biodegrader; biocatalyst; pretreatment; xylanase; beta-glucosidase;

   Abstract : Energy consumption has increased rapidly during the last century due to population growth and greater industrialization. Lignocellulosic-based biofuels are being developed as alternatives to fossil fuels. For many years the question of how 5-carbon sugars in biomass are utilized in nature has been a vexed one. READ MORE