Sökning: "Helena Lindström"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Helena Lindström.

1. 1. Equine glutathione transferase A3-3 : an efficient steroid isomerase

   Författare :Helena Lindström; Bengt Mannervik; Ann-Kristin Östlund Farrants; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Equine; glutatione transferase; steroidogenesis; steroid isomerase; neurokemi med molekylär neurobiologi; Neurochemistry with Molecular Neurobiology;

   Sammanfattning : Glutathione transferases (GSTs) comprise a superfamily of enzymes prominently involved in detoxication by making toxic electrophiles more polar and therefore more easily excretable. However some GSTs have developed alternative functions. LÄS MER

3. 2. Exploring the steroidogenic activity of glutathione transferases across species

   Författare :Helena Lindström; Bengt Mannervik; Kjell Wikvall; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Glutathione transferase; steroidogenesis; GST A3-3; testis; androstenedione; pregnenedione; equine; steroidogenesis inhibition; Drosophila GSTE14; neurokemi med molekylär neurobiologi; Neurochemistry with Molecular Neurobiology;

   Sammanfattning : Glutathione transferases (GSTs) comprise a superfamily of enzymes prominently involved in detoxication. However, some GSTs have developed alternative functions. LÄS MER

4. 3. Förhållandet mellan praxis och teori inom etiken

   Författare :Niclas Lindström; Ulf Görman; Helena Röcklinsberg; Anders Nordgren; Centrum för teologi och religionsvetenskap; []
   Nyckelord :HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; Practice; theory; norms; ideals; principles; moral philosophy; casuistry; discourse ethics; virtue ethics; theocentric ethics; pragmatism; experimental ethics; empirically informed ethics.; etik; etik;

   Sammanfattning : The main question of this thesis is if a practice is right because it is prescribed by an ethical theory, or if an ethical theory is right because it follows from certain practices? I propose the following definitions to illustrate the main alternatives: (1) if a practice is determined by an ethical theory and the ethical theory is not determined by practice, it is possible to speak of a top-down model of ethical thinking. (2) If a theory, conversely, is determined by a practice and the practice is not determined by theory, it can be described as a bottom-up model. LÄS MER

5. 4. Aspects of extended impregnation kraft cooking for high-yield pulping of hardwood

   Författare :Helena Wedin; Mikael E. Lindström; Martin Ragnar; Jorge L. Colodette; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Yield; pulp; kraft cook; carbohydrate; xylan; oxygen delignification; Hexenuronic acid; kappa number;

   Sammanfattning : The long-term trend regarding wood is an increase in price. Because wood contributes to a large part of production costs, the efficient utilisation of wood is greatly desired to reduce production costs for kraft pulp producers. During the 1990s, the development of improved modified kraft cooking began, which led to higher yields. LÄS MER

7. 5. On the Process Development of an ECF Light Bleaching Sequence for the Production of High Quality Softwood Kraft Pulp and Low AOX Formation

   Författare :Sara Starrsjö; Juha Fiskari; Mikael Lindström; Olena Sevastyanova; Maria Boman; Peter Sandström; Mittuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemical Engineering; Natural Science; Chemical Pulping; Softwood; Kraft Pulp; Bleaching; ECF light bleaching; Chlorine Dioxide; AOX formation; Delignification; Bleachability;

   Sammanfattning : The aim of this work is to contribute to the process development of the ECF light bleaching sequence Q(OP)D(PO) by providing a better understanding of the bleaching of softwood kraft pulp. There are few published studies on this type of sequence, and more knowledge is needed on how to reduce environmental impact, improve cost-effectiveness and ensure a high pulp quality. LÄS MER