Sökning: "Poly L"

Visar resultat 16 - 20 av 83 avhandlingar innehållade orden Poly L.

1. 16. Synthesis of Biomedical Polymers and Scaffold Design

   Författare :Therese Tyson; Ann-Christine Albertsson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ring-opening polymerization; tin alkoxide initiator; stannous octoate; poly p-dioxanone ; copolymer; L-lactide; trimethylene carbonate; degradable porous scaffold; Polymer chemistry; Polymerkemi;

   Sammanfattning : This work has focused on the development of new improved synthesis methods of biodegradable aliphatic polymers and on the preparation of porous scaffolds for tissue engineering applications. The aim of the first part of the work was the synthesis of poly(p-dioxanone) (PPDX) homopolymers with high molecular weights using the cyclic tin alkoxide initiator 1-di-n-butyl-1-stanna-2,5-dioxacyclopentane. LÄS MER

3. 17. Production of poly(3-hydroxybutyrate) and ectoines using a halophilic bacterium

   Författare :Thuoc Doan Van; Bioteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fermentation; Ectoine; halophilic bacterium; Poly 3-hydroxybutyrate ;

   Sammanfattning : Halomonas boliviensis is a moderate halophilic bacterium, isolated from a soil sample around a hypersaline lake Laguna Colorada in the Andean region of Bolivia. The organism is capable of growing over a wide range of NaCl concentration (0-25 %, w/v), however with an optimum of about 4.5 % (w/v) NaCl. LÄS MER

4. 18. Poly(Lactide-co-Glycolide) in Controlled-Release Pharmaceuticals - Release Mechanisms

   Författare :Susanne Fredenberg; Avdelningen för kemiteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PLGA; Poly lactide-co-glycolide ; Release mechanism; Diffusion; Controlled Release; Degradation; Protein;

   Sammanfattning : Controlled-release formulations reduce the frequency of injections and better maintain plasma concentrations within the therapeutic window. Poly(D,L-lactide-co-glycolide) (PLG) is currently the most frequently used biodegradable polymer for this application. LÄS MER

5. 19. Production of Ectoines and Poly(3-Hydroxybutyrate): High Cell-Density Cultivation of Halomonas Boliviensis

   Författare :Hector Guzmán; Bioteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; poly 3-hydroxybutyrate ; hydroxyectoine; ectoine; Halomonas boliviensis; compatible solutes; Fed-batch cultivation;

   Sammanfattning : This thesis reports a study involving the use of Halomonas boliviensis, a moderate halophile, for production of biopolyester poly(3-hydroxybutyrate) (PHB) and compatible solutes ectoine and hydroxyectoine through high cell-density cultivation comprising fed-batch cultures. PHB is a biodegradable plastic produced by bacteria as energy reserve and can potentially be used as a replacement of fossil based plastic. LÄS MER

7. 20. Halomonas species as a source of poly(3-hydroxybutyrate). Preparation of hydrophilic macroporous polymer scaffolds

   Författare :Daniel Guzmán; Bioteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Halomonas species; poly 3-hydroxybutyrate ; genome sequence; Fed-batch cultivation; macroporous scaffolds;

   Sammanfattning : This thesis presents studies on moderately halophilic bacteria belonging to the family Halomonadaceae that accumulate polyhydroxybutyrate (PHB) in high amounts when grown under conditions of nitrogen limitation. PHB is the simplest homopolymer belonging to the class of polyhydroxyalkanoates (PHAs), the biopolyesters that can biodegraded in the environment to carbon dioxide and water and are hence attractive substitutes for fossil-derived plastics. LÄS MER