Index Catalog // ScholarsArchive@OSU

Creator:: Ni, Hae-Rong
Abstract:: A thermomechanical pulp, a high yield sulfite pulp, and a high yield solvent sulfite pulp from western hemlock [Tsuga heterophylla (Raf.) Sarg.] wood were investigated to determine the amount of carbohydrate material present and to elucidate the structures of the carbohydrates. The effects of the three pulping processes, which were...
Resource Type:: Dissertation
Full Text:: : Murray L. Laver A thermomechanical pulp, a high yield sulfite pulp, and a high yield solvent sulfite

Creator:: Lai, Yu-chai Leslie
Abstract:: The inner bark of Douglas-fir was successively extracted with ethanol-water (4:1 v/v), benzene-ethanol (2:1, v./iv), water, and 0.5% aqueous ammonium oxalate solution. The residue was reacted with acidified sodium chlorite, a commonly used reagent to separate lignin from carbohydrates. In general the reaction dissolves the lignin and leaves the carbohydrates...
Resource Type:: Masters Thesis

Creator:: Xie, Dingming
Abstract:: Six filtrate samples (liquid state) were obtained from selected stages in a totally-chlorine- free (TCF) bleach pulp mill. The solids were recovered by evaporation on rotary evaporators and by lyophilization with a freeze drier. Chemical contents (inorganic and organic chemicals) of the six filtrates were analyzed quantitatively according to TAPPI...
Resource Type:: Masters Thesis
Full Text:: : 'Murray L. L. Laver Six filtrate samples (liquid state) were obtained from selected stages in a totally

Creator:: Song, Hong-keun
Abstract:: Dihydroquercetin [(2,3-trans)-3,3',4',5,7-pentahydroxyflavanonol] was shown to be the precursor to the phenolic stains that often develop in Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] sapwood. Douglas-fir sapwood was extracted with methanol and the methanol solubles were fractionated by solvent partition, thin-layer chromatography, silica-gel column chromatography, and Sephadex gelpermeation chromatography. Tyrosinase, a commercially available...
Resource Type:: Dissertation

Creator:: Wilson, Kenneth P.
Abstract:: This work is part of a larger project dealing with nonprocess element (NPE) behaviour in chemical pulping processes. Nonprocess elements are defined as those elements which are not essential to the chemical process, i.e. are neither active pulping chemicals (e.g., NaOH and Na2S in the kraft process), nor compounds present...
Resource Type:: Dissertation

Creator:: Musbah, Durria Abdel Azim
Abstract:: Chemical stains that develop on commercial woods are problems of great economic importance. The polyphenol oxidases catalyze the oxidation of the phenolics that naturally exist in plants to quinones when the cell structure is disrupted. The quinones produced are further oxidized and polymerized to melanin, the pigment which is responsible...
Resource Type:: Dissertation
Full Text:: Properties of Douglas-fir Sapwood Polyphenol Oxidase Abstract approved:2'A Dr. Murray L. Laver structure is

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