Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 25 for “"hemicelluloses"”.
-
Arabinoglucuronoxylan and Arabinoxylan Adsorption onto Regenerated Cellulose Films
Cellulose and hemicelluloses have attracted increasing interest as renewable biopolymers because of their abundance. Furthermore, the recognition of biomass as a sustainable and renewable source of biofuels has driven research into the assembly and disassembly of polymers within plant cell walls. …
-
Clean Fractionation of Biomass - Steam Explosion and Extraction
… constitutive chemical components, cellulose, hemicelluloses (called "other carbohydrates") and non-carbohydrates (includes lignin, tannins, etc.), was studied quantitatively in terms of relative cleanness. Red oak chips were steam exploded using a batch reactor at five different treatment …
-
Influence of a Biodegradable Litter Amendment on the Pyrolysis of Poultry Litter
… poultry litter indicated a mixture of volatiles, hemicelluloses, cellulose, lignin, ash, and proteins. AmmoSoak had a simpler composition than the litter; mainly hemicelluloses, cellulose, and lignin. Bench-scale studies indicated that adding AmmoSoak affected the yields and characteristics of the …
-
Wood extractives in hemicellulose stabilized emulsions
… 30-40% of the wood in the form of cellulose. Hemicelluloses, mainly galactoglucomannans (GGM) in spruce and glucuronoxylan (GX) in birch, comprise around 30% of the mass of wood. By far, this part has not been utilized as raw material but burnt as a source of energy. GGM and GX can be …
-
On the Recalcitrant Nature of Sphagnum's Cell Wall
… across land plants, including Iβ cellulose, hemicelluloses such as galactomannan and xyloglucan, and pectins. While moss specific modifications were apparent, such as the absence of canonical xylan conformations typical of vascular plants and the presence of an unidentified β-glucan like …
-
A two-stage thermal modification of wood
… of the main components of wood (cellulose, hemicelluloses and lignin) appear to be involved in the effects of heat treatment on important wood properties like dimensional stability, strength/stiffness and biological durability. Although the effect of heat treatment on the anatomical …
-
Renewable Natural Polymer Thin Films and Their Interactions with Biomacromolecules
… initial rate for G-DHP than H-DHP. Adsorption of hemicelluloses onto KL, OL and MWL thin films was studied by QCM-D and SPR. Results from QCM-D showed that hemicelluloses with different structures displayed very different adsorption behavior. Adsorption isotherms from QCM-D and SPR indicated that …
-
Biochemical and molecular analyses of plant cell wall degrading enzymes from the rumen bacterium Ruminococcus albus 8
… cell wall polysaccharides, such as cellulose and hemicelluloses. Xylan, a hemicellulosic polymer of β-1,4 linked xylose monomers may be appended with arabinose, glucuronic acid, and acetyl residues. Several classes of enzymes attack the polysaccharide to release the constitutive monosaccharides. …
-
Evaluation of Stability Parameters for Landfills
… remaining cellulose along with lignin and the hemicelluloses takes place. The start of lignin and hemicellulose degradation results in an increase in the biochemical methane potential (BMP). In the second part of the study, the addition of moisture to the landfills presented a contentious …
-
THE SPECIAL WALLS AROUND GAMETES IN CERATOPTERIS RICHARDII AND AULACOMNIUM PALUSTRE: USING IMMUNOCYTOCHEMISTRY TO EXPOSE STRUCTURE, FUNCTION, AND DEVELOPMENT
… Aulacomnium. The preponderance of callose and hemicelluloses in the walls of the male gametes of Ceratopteris and Aulacomnium, respectively, and the importance of these polysaccharides in development are discussed. Taken together, the studies that comprise this dissertation advance …
-
Functional metagenomic analysis of carbohydrate degrading enzymes from the human gut microbiota
… Plant cell wall components (cellulose, hemicelluloses and pectins), resistant starch and various oligosaccharides reach the colon by escaping digestion in the upper gastrointestinal tract. Fermentation of these dietary carbohydrates by the gut microbiota has well-recognised beneficial …
-
Molecular interactions of plant cell wall polymers
… similarities in interactions between lignin and hemicelluloses occur in Angiosperms and Gymnosperms and that these interactions may play roles in the maintenance of plant material properties, such as the recalcitrance to enzymatic digestion.
-
Investigating biomass saccharification for the production of cellulosic ethanol
… within biomass while DA treatment mainly removed hemicelluloses, resulting in a much less substrate accessibility of the latter than of the former. It also concluded that enhancing substrate accessibility was the key to an efficient bioconversion of lignocellulose. A simple method for determining …
-
Effect of maturity on rumen degradation of tropical and temperate forage cell wall polysaccharides from leaves and stems
… cellulose and linear and branched fractions of hemicelluloses. Two temperate forages, orchard grass (Dactylis qlomerata) and tall fescue (Festuca arundinacea) harvested at different stages of growth and separated into leaves and stems were used. The cell wall content (NDF) and hemicellulose A …
-
Xylan chain length and plant cell wall assembly
… of cellulose (40-60%), lignin (20-30%), and hemicelluloses (20-30%). The plant cell wall is the largest source of renewable carbon (>75% of the biosphere carbon), appearing in numerous products. However, many applications are hindered by our poor understanding of the cell wall. Here, I …
-
Pressure Variation Assisted Fiber Extraction and Development of High Performance Natural Fiber Composites and Nanocomposites
… Just like in wood the polymers are: cellulose, hemicelluloses, and lignin. When subjected to elevated pressures and temperatures, we are able to get access to some of these natural polymers and use them as a matrix material for composite fabrication. Therefore, fabrication of composite materials …
-
Understanding the Relative Importance of the Effects of Soluble and Insoluble Inhibitors on the Enzyme Digestibility of Steam Pretreated Radiata Pine
… to disrupt and/or remove some of the lignin and hemicelluloses, so that the cellulose is more accessible to enzymes. Softwoods, such as Pinus radiata, are amongst the most recalcitrant substrates towards enzymatic hydrolysis, typically, they require more severe pretreatment conditions and higher …
-
Two thermostable hemicellulases and their effects on wood pulps
… in solubilising xylan from kraft pulps. The hemicelluloses of kraft pulps that had been enzyme treated were extracted. The extracted xylan from the xylanase-treated pulp was lower in average DP than the xylan extracted from untreated pulps. The average DP of the extracted glucomannan from the …
-
Phytophthora parasitica and lupin (Lupinus angustifolius) interactions: changes in gene expression during infection and after phosphite treatment
… of complex polysaccharides (i.e. cellulose, hemicelluloses and pectins) and proteins and they constitute an effective barrier that impedes the entry of many potential pathogens. In order to penetrate the plant cell wall, pathogens secrete a diverse array of cell wall degrading enzymes …
-
Phytophthora parasitica and lupin (Lupinus angustifolius) interactions: changes in gene expression during infection and after phosphite treatment
… of complex polysaccharides (i.e. cellulose, hemicelluloses and pectins) and proteins and they constitute an effective barrier that impedes the entry of many potential pathogens. In order to penetrate the plant cell wall, pathogens secrete a diverse array of cell wall degrading enzymes …
Page 1 of 2