Sökning: "nitrite"

Visar resultat 11 - 15 av 112 avhandlingar innehållade ordet nitrite.

1. 11. 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

3. 12. Clostridium difficile-associated diarrhoea - aspects of hospital epidemiology and treatment

   Författare :Marlene Wullt; Enheten för infektionssjukdomar; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Infektioner; peracety ions; Lactobacillus plantarum 299v; metronidazole; fusidic acid; PCR-ribotyping; Clostridium difficile-associated diarrhoea; AP-PCR; Infections; acidified nitrite;

   Sammanfattning : Clostridium difficile is a spore-forming bacterium that causes antibiotic-associated diarrhoea and is responsible for hospital outbreaks of diarrhoea. In the first study, 173 consecutive isolates of C. LÄS MER

4. 13. Theoretical studies of blue copper proteins

   Författare :Mats H M Olsson; Beräkningskemi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantum chemistry; metal-thiolate bonds; axial ligation; electron transfer proteins; reduction potential; reorganisation energy; Cu II ; Cu I ; strain; Induced-rack theory; Entatic state theory; cytochrome c oxidase; CuA; nitrite reductase; azurin; Blue copper proteins; plastocyanin; B3LYP; CASPT2; Soil Science; agricultural hydrology; Lantbrukshydrologi; marklära;

   Sammanfattning : In this thesis, a critical investigation is presented about the role of mechanical strain for the electron-transfer properties of the blue copper proteins. It has been found that the structure of a realistic model complex of the oxidised blue-copper active site, optimised in vacuum with the B3LYP method, has the same trigonal cupric geometry as in the protein. LÄS MER

5. 14. Aromatic Allylation via Diazotization; Application in synthesis of heterocyclic compounds

   Författare :Fredrik Ek; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bengamide analogue.; parallel synthesis; trimethylsilyl azide; cycloaddition; imidazole; fused tetrazole derivatives; iodocyclization; benzazepine; tert-butyl nitrite; allylic bromide; aromatic allylation; diazotization; Organic chemistry; Organisk kemi;

   Sammanfattning : A new method for allylation of aromatic systems has been developed. A number of arylamines were converted via diazotization to the corresponding allylaromatic compounds using tert-butyl nitrite and an excess of allylic bromides with complete regioselectivity. Electron-withdrawing groups, in the aromatic moiety, were necessary to obtain good yields. LÄS MER

7. 15. NADPH oxidase and xanthine oxidoreductase as targets and regulators of the nitrate-nitrite-nitric oxide pathway

   Författare :Maria Peleli; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Overproduction of reactive oxygen species (ROS) by NADPH oxidase (NOX) and xanthine oxidoreductase (XOR) with a concomitant decrease in the bioavailability of nitric oxide (NO) from eNOS contributes to the development of cardiovascular and metabolic disorders. Extensive research has proven the existence of an alternative NOS-independent pathway for NO production. LÄS MER