Search for dissertations about: "pKa values"

Showing result 21 - 25 of 27 swedish dissertations containing the words pKa values.

  2. 21. Characterization of aluminum in environmental systems using X-ray absorption and vibrational spectroscopy : The importance of organic matter

    Author : Kristoffer Hagvall; Torbjörn Karlsson; Per Persson; Lars Lövgren; Dan Berggren Kleja; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The fate and behavior of many metals in the environment are highly dependent on interactions with natural organic matter (NOM), which is abundant in most soils and surface waters. The complexation with NOM can influence the speciation of the metals by affecting their hydrolysis and solubility. READ MORE

  4. 22. Use of Switchable Carbamate Surfactants for Design of Reversible Colouring of Cotton

    Author : Anna-Karin Hellström; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; cotton; pigment; textile colouring; de-colouring; switchable surfactant; carbamate;

    Abstract : Circularity of materials is a global need. However, recycling of cotton often requires many steps involving chemical or mechanical treatments. According to the waste hierarchy, reuse is a more environmentally benign approach than recycling, giving extended lifecycles with only limited processing of materials. READ MORE

  5. 23. On the Local Filtration Properties of LignoBoost lignin: Studies of the influence of xylan and ionic strength

    Author : Julie Durruty; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acid precipitation.; LignoBoost process; compressible filter cake; particle interactions; xylan; softwood lignin; constitutive relationships; local filtration properties; dead-end filtration;

    Abstract : Kraft pulping technology is currently the most commonly-used method for producing paper pulp from wood. A new and promising opportunity for Kraft pulp mills is to take a step towards becoming biorefineries by implementing technologies able to extract and convert the organic by-products, such as lignin, into a wide range of value-added products and chemicals. READ MORE

  6. 24. Cooperative Reactive Sites in Designed Helix-Loop-Helix Polypeptide Catalysts

    Author : Jonas W. Nilsson; Paolo Scrimin; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Designed polypeptides, which fold into helix-loop-helix motifs and dimerise to four-helix bundles have been used as scaffolds for the introduction of catalytic activity for the hydrolysis of p-nitrophenyl esters. The reactive sites were based on the reactivity of histidine, and two His residues separated by four residues in the sequence was shown to be the minimal reactive site for the efficient hydrolysis of nitrophenyl esters. READ MORE

  7. 25. Structural and functional studies on glutaredoxins and members of the thioredoxin superfamily

    Author : Johan Sagemark; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : The active site of E.coli glutaredoxin 3 was investigated using a combination of experimental and theoretical techniques. Starting from different conformations, molecular dynamics simulations converged to an active site conformation where the Cys11 thiolate was hydrogen bonded to surrounding amide protons and to the thiol proton of Cys14. READ MORE