Search for dissertations about: "guaiacyl"

Showing result 1 - 5 of 8 swedish dissertations containing the word guaiacyl.

  2. 1. Composition of lignin in outer cell-wall layers

    Author : Maria Christiernin; Gunnar Henriksson; Gösta Brunow; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lignin; thioacidolysis; primary wall; middle lamella; Populus balsamifera; Populus tremula L. x P. tremuloides Michx.; Picea abies; Picea glauca; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Abstract : The composition of lignin in the outer cell-wall layers of spruce and poplar has been studied and the data obtained have been compared with those of the mature reference wood in which the secondary cell wall predominates. Materials with exclusively or predominantly outer cell-wall layers were examined. READ MORE

  4. 2. New regulators of xylem lignification in arabidopsis

    Author : Bernadette Sztojka; Hannele Tuominen; Simon Hawkins; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Xylem; lignin; Arabidopsis; secondary cell wall; transcriptional regulation; lignin-biosynthetic gene; S G lignin ratio;

    Abstract : The ability of land plants to grow upright, bear their own weight and withstand adverse environmental conditions is largely dependent on the secondary xylem tissues of the stem. The xylem cells acquire thick secondary cell walls which are composed of cellulose, hemicellulose and lignin. READ MORE

  5. 3. Function of MAP20 and MYB103 in cellulose and lignin formation of xylem secondary cell walls

    Author : David Öhman; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Lignocellulose from trees and other crops will have tremendous impact on the next generation of sustainable biofuels and biomaterials. To take advantage of modern breeding tools, it is therefore important to understand the genetic and molecular regulation underlying secondary cell wall formation. READ MORE

  6. 4. Biopolymers and materials from rapeseed straw biorefining

    Author : Antonia Svärd; Ulrica Edlund; Elisabet Brännvall; Stefan Willför; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Rapeseed canola straw; biorefinery; hemicelluloses; lignin; cellulose; cellulose nanoparticles; films; grafting; thermoplastic; biocomposites; rapshalm; bioraffinaderi; hemicellulosa; lignin; cellulosa; cellulosa nano partiklar; hemicellulosafilm; ympning; termoplastisk; biokompositer; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Abstract : Rapeseed straw was fractionated through a hydrothermal process into its hemicellulose, lignin and cellulose components. In the first step, hemicellulose-rich fractions were extracted. Xylan-rich fractions with high molecular weight, 30,000 – 50,000 g/mol, were obtained at 110 °C and 1.5 M NaOH. READ MORE

  7. 5. Light-Induced Yellowing of High-Yield Pulps. The Effect of Acetylation

    Author : Magnus Paulsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; yellowing; mechanical properties; hydroxyl groups; phenolic groups; paper; high-yield pulps; chromophores; model compounds; acetylation; inhibition;

    Abstract : This thesis is a contribution to the understanding of the mechanism of photoyellowing of high-yield pulps. It also gives some general information about the reactivity of different functional groups in lignin towards acetic anhydride. READ MORE