Search for dissertations about: "Calcium oxalate"

Showing result 1 - 5 of 12 swedish dissertations containing the words Calcium oxalate.

2. 1. Industrial applications and properties of oxalate-degrading enzymes

   Author : Sandra Winestrand; Leif J. Jönsson; Thomas Nilsson; Nils-Olof Nilvebrant; Gudmundur O. Hreggvidsson; Karlstads universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Oxalic acid; oxalate oxidase; oxalate decarboxylase; calcium oxalate; scaling; active packaging; Kemi; Chemistry;

   Abstract : Oxalate-degrading enzymes were investigated with focus on potential applications in the pulp and paper industry and in active packaging. Changes introduced to make the pulp and paper industry more environmentally friendly, such as recirculation of process-water streams and elementary chlorine free bleaching of pulp, have led to increasing problems with precipitation of calcium oxalate. READ MORE

4. 2. Inorganic ions in wood chips- Leaching prior to Kraft pulping and effect of calcium on Kraft delignification

   Author : Anna Saltberg; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; modelling; calcium; Scandinavian softwood; Keywords: Kraft pulping; potassium; birch; eucalyptus; aspen; acidic leaching; oxalate.;

   Abstract : Wood is the main source of Non-Process Elements (NPEs), such as, calcium, potassium, manganese and chloride in Kraft pulp mills. Due to the recirculation of cooking chemicals and water, process disturbances related to the accumulation of NPEs in the process streams are inevitable. READ MORE

5. 3. Removal of Metal Ions from Wood Chips during Acidic Leaching

   Author : Anna Saltberg; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Scandinavian softwood; spruce; calcium; diffusion coefficient; potassium; birch; Acidic leaching; eucalyptus; metal ions; oxalate;

   Abstract : Wood chips are the main source of intake of non-process elements at kraft pulp mills. It would be advantageous to decrease the content of these elements in the chips prior to pulping. READ MORE

6. 4. Ectomycorrhizal community structure and function in relation to forest residue harvesting and wood ash applications

   Author : Shahid Mahmood; Biologiska institutionen; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; 14C allocation; P uptake; Calcium oxalate; Solubilisation; Tricalcium phosphate; Wood ash; Forest residue; N deposition; rDNA; ITS region; PCR-RFLP; Spruce; Ectomycorrhiza; Community structure; Wood ash colonisation; Spruce colonisation; Competition; Ecology; Ekologi;

   Abstract : Ectomycorrhizal fungi form symbiotic associations with tree roots and assist in nutrient-uptake and -cycling in forest ecosystems, thereby constituting a most significant part of the microbial community. The aims of the studies described in this thesis were to evaluate the potential of DNA-based molecular methods in below-ground ectomycorrhizal community studies and to investigate changes in ectomycorrhizal communities on spruce roots in sites with different N deposition, and in sites subjected to harvesting of forest residues or application of wood ash. READ MORE

7. 5. Crystallisation of calcium phosphate and calcium oxalate in solutions simulating the composition at different levels of the nephron

   Author : Inge Højgaard; Linköpings universitet; []
   Keywords : MEDICINE; MEDICIN;

   Abstract : Calcium oxalate (CaOx) is the most common constituent of urinary calcium stones, but in many such stones calcium phosphate (CaP) is also present and often located in the centre. From these observations it has been assumed that CaP is important in the process that leads to the development of a calcium stone and furthermore that the initial steps in this crystallisation take place in the nephron. READ MORE