Sökning: "Nitrogen formation"

Visar resultat 16 - 20 av 305 avhandlingar innehållade orden Nitrogen formation.

1. 16. Principles of Biomass Pyrolysis with Emphasis on the Formation of the Nitrogen-Containing Gases HNCO, HCN and NH3

   Författare :Karl-Martin Hansson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pyrolysis; depolymerisation; NH3; HCN; crack formation; fragmentation; combustion time; pyrolysis time; HNCO; biomass; shrinkage;

   Sammanfattning : This thesis investigates some aspects of the pyrolysis and combustion of biomass. The emphasis of the work is on the formation of nitrogen-containing species under pyrolysis. LÄS MER

3. 17. PII proteins as global regulators of bacterial nitrogen metabolism

   Författare :Pedro Filipe Teixeira; Stefan Nordlund; Ray Dixon; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Rhodospirillum rubrum; nitrogen metabolism; signal transduction; PII proteins; Biochemistry; Biokemi; Biochemistry; biokemi;

   Sammanfattning : Nitrogen is an essential element to sustain life, being a component of most biological macromolecules. In spite of the abundance of gaseous N2, the availability of nitrogen compounds that can be readily used by most microorganisms is scarce and its production energetically demanding. LÄS MER

4. 18. Use of chemical denitrification for nitrogen removal from landfill leachates

   Författare :Aleksandra Nikolic; KTH; []
   Nyckelord :Chemical denitrification; conductivity; evaporation drying; freezing thawing; leachate; nitrogen removal;

   Sammanfattning : Landfill leachate usually has a high concentration ofammonium nitrogen and heavy metals, but too low alkalinitycontent for full biological nitrification, as well as a too lowconcentration of biologically degradable organic carbon forbiological denitrification, and at the same time very variablecomposition (quantity and quality) with time. These factorsresult in serious problems for treating leachate with existingsystems. LÄS MER

5. 19. Heme-copper oxidases and nitric oxide : Reaction mechanisms and supercomplex formation

   Författare :Ingrid Albertsson; Pia Ädelroth; Alessandro Giuffrè; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Heme-copper oxidase; nitrite reductase; nitric oxide reductase; nitric oxide; supercomplex; Paracoccus denitrificans; denitrification pathway; proton transfer pathway; C-type oxidase; Helicobacter pylori; Biochemistry; biokemi;

   Sammanfattning : In the denitrification process where nitrate is stepwise reduced to nitrogen gas, the toxic molecule nitric oxide (NO) is formed as an intermediate. Nitric oxide is produced by the enzyme cd1 Nitrite reductase (cd1NiR) by reduction of nitrite and is later reduced to nitrous oxide by nitric oxide reductase (cNOR). LÄS MER

7. 20. Metabolic engineering and cultivation strategies for recombinant production of (R)-3-hydroxybutyrate

   Författare :Mariel Perez-Zabaleta; Gen Larsson; Antonius J. A. van Maris; Diethard Mattanovich; KTH; []
   Nyckelord :Escherichia coli; R -3-hydroxybutyrate; nitrogen limitation; nitrogen depletion; lignocellulose; fed batch; acetate; β-ketothiolase; acetoacetyl-CoA reductase; Halomonas boliviensis.; Bioteknologi; Biotechnology;

   Sammanfattning : Metabolic engineering and process engineering are two powerful disciplines to design and improve microbial processes for sustainable production of an extensive number of compounds ranging from chemicals to pharmaceuticals. The aim of this thesis was to synergistically combine these two disciplines to improve the production of a model chemical called (R)-3-hydroxybutyrate (3HB), which is a medium-value product with a stereocenter and two functional groups. LÄS MER