Global ETD Search
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Showing 1 to 20 of 28 for “"Pulps"”.
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Two thermostable hemicellulases and their effects on wood pulps
… the hemicellulose components of various types of pulps and their effects on the bleachability of radiata pine kraft pulp were examined. The xylanase (two preparations) and mannanase had broad pH optima (6-7.5). The xylanases had temperature optima of 70°C (10 min assay) and the mannanase had an …
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Rheological investigation of three South African gold mine pulps
A method is described which enables the user to determine the rheological parameters of a fast settling slurry using conventional viscometric measuring equipment. The effect of concentration, temperature and pH on these parameters is investigated. The results agree with those obtained by previous …
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Properties of paper obtained from ultrasonically and mechanically beaten pulps
… and mechanical properties of paper obtained from pulps beaten ultrasonically and mechanically was made at different Canadian standard freeness levels.
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The effect of formocresol and calcium hydroxide on the dental pulps of rhesus monkeys
Indiana University-Purdue University Indianapolis (IUPUI)
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Immunohistochemical Study of Phenotypes of Dendritic Cells in Dental Pulps from Non-Carious and Carious Teeth
… would be found in association with mature DCs. Pulps were collected from teeth exhibiting: (I) no caries (n=9), (II) shallow dentinal caries (n=5), and (III) deep caries (n=9). Pulpal tissues were cryo-sectioned and positive cells were examined with immunohistochemistry, Mature DCs (CD83+) were …
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Analysis of wood pulp extracts utilizing gas chromatography-mass spectroscopy
… this investigation, chemithermomechanical (CTMP) pulps as well as Kraft (BKP) pulps were Soxhlet extracted with solvents of different polarity. These two types of pulp extracts were then compared qualitatively using GC-FID and GC-MSD as well as quantitatively based on the percent of extractives …
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Structural changes to Pinus radiata wood lignin during kraft pulping and bleaching
… of native (within wood) and residual (within pulps) lignins. A better understanding of the structure of lignin will assist the development of improved pulping and bleaching sequences. However, before this can be done, it is necessary to develop approaches to lignin isolation which provide more …
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Analysis of intra-increment pulping and papermaking properties of loblolly pine wood
… variables were held constant. A total of twenty pulps were prepared. Significant differences were observed in pulp yields between intra-incremental growth zones. For the longer digestion times, fraction 1, the early springwood, produced pulp yields greater than the remaining four growth zones. …
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Formation, characterization, and chemical reactions of free radicals in lignin
… photoreduction techniques to high- yield pulps was demonstrated. However, optimal experimental conditions for photoreduction of lignin in high-yield pulps have not been established yet.
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Pulp reaction to anorganic bovine dentin
… bacteria in the pulp. No bacteria were found in pulps which were successfully repaired. It was concluded that anorganic bovine dentin seemed to induce calcific repair of the dental pulp in the absence of bacteria. Autogenous dentin chips appeared to have the same effect. The importance of …
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The Effect of ESCHERICHIA COLI Endotoxin on the Cat Periapical Tissues
… and mandibular cuspids were isolated and the pulps extirpated with barbed broaches. The four solutions (1, 10, 100 μg/ml endotoxin, and saline) were then injected into the four prepared teeth for each cat and the access cavities sealed with IRM.</p> <p>At two week intervals, two cats were …
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Diseño de la biolixiviación en continuo para la gestión de residuos piríticos
… optimization of the operational conditions of pulps density and temperature, a cascade of 4 reactors in series with an initial tank as a repulper was design and built. From the continuous operation of the cascade, high values of conversion and consequent weight losses of the mining residue were …
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MRGX1-TRPAI in inflammatory pain signalling
… more intense in inflamed versus healthy dental pulps. Endogenous MRGX1 protein expression was confirmed in both in-vitro models of human nociceptors. The functionality of MRGX1 and its interaction with TRPA1, as well as the mechanisms involved was confirmed by calcium imaging. Results showed …
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Surface properties of New York talc as a function of pH, polymer adsorption and electrolyte concentration
… polymeric depressants to be added to flotation pulps in order to prevent it from entering the concentrate and reducing its grade. Various polymers such as non-ionic guar gums and anionic Carboxymethyl cellulose (CMC) depressants are employed for this purpose. However, the industrial use of these …
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Effect of Antibiotic Pastes on Chemical Structure and Microhardness of Radicular Dentin
… therapy in immature teeth with necrotic pulps triggers continued root development, thereby improving the prognosis of these teeth. Disinfection of the canal is accomplished with an intracanal medicament, such as triple antibiotic paste (TAP) composed of metronidazole, ciprofloxacin, and …
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Biopolymer Structure Analysis and Saccharification of Glycerol Thermal Processed Biomass
… fraction, 84% glucan, as found in chemical pulps. Lignin structural analysis indicated GTP processing resulted in extensive degradation of B-aryl ether bonds through the C-y elimination, followed by abundant phenolic hydroxyl liberation. At the same time, condensation occurred in the GTP …
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Increasing Sustainability of the Papermaking Process via Formulation of Cellulose Nanofibers and Polyelectrolyte Complexes
… and to dry compared to typical cellulose fiber pulps. Therefore, to achieve greater sustainability of CNFs and products made from them, methods to reduce energy needed to dry are necessary and one strategy is to design the chemicals in the cellulose slurry to improve drainage prior to …
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