Sökning: "proton reduction"

Visar resultat 16 - 20 av 112 avhandlingar innehållade orden proton reduction.

1. 16. Experimental studies of proton translocation reactions in biological systems : Electrogenic events in heme-copper oxidases

   Författare :Håkan Lepp; Peter Brzezinski; Thomas Nilsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; heme-copper oxidase; cytochrome c oxidase; nitric oxide reductase; cbb3-type oxidase; proton pumping; uncoupling; charge-transfer; electrogenic event; flow-flash; Biophysics; Biofysik; Biophysics; biofysik;

   Sammanfattning : Terminal heme-copper oxidases (HCuOs) are transmembrane proteins that catalyze the final step in the respiratory chain - the reduction of O2 to H2O, coupled to energy conservation by generation of an electrochemical proton gradient. The most extensively investigated of the HCuOs are the aa3-type oxidases, to which cytochrome c oxidase (CytcO) belongs, which uses energy released in the O2-reduction for proton pumping. LÄS MER

3. 17. Kinetics of proton and electron transfer in heme-copper oxidases

   Författare :Peter Lachmann; Pia Ädelroth; Örjan Hansson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Heme-copper oxidase; electron transfer; proton transfer; nitric oxide reductase; ba3 oxidase; flow-flash; laser-flash photolysis; Biochemistry; biokemi;

   Sammanfattning : Heme-copper oxidases are transmembrane proteins that are found in aerobic and anaerobic respiratory chains. During aerobic respiration, these enzymes reduce dioxygen to water. The energy released in the reaction is used to transport protons across a biological membrane. LÄS MER

4. 18. Structure and Function of Cytochrome c Oxidase

   Författare :Gisela Brändén; Peter Brzezinski; Mårten Wikström; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cytochrome c oxidase; proton pumping; proton transfer; electron transfer; X-ray crystallography; flow flash; Biochemistry; Biokemi;

   Sammanfattning : Aerobic organisms, ranging from bacteria to humans, obtain their energy through the process of respiration. Electrons from the breakdown of food are transported through the membrane-bound enzyme complexes of the respiratory chain, to the terminal acceptor molecule, oxygen. LÄS MER

5. 19. Synthetic [FeFe] Hydrogenase Active Site Model Complexes

   Författare :Lennart Schwartz; Sascha Ott; Marcetta Y. Darensbourg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hydrogenase mimic; proton reduction; bioinorganic chemistry; diiron hexacarbonyl complexes; artifical photosynthesis; hydrogen; Organic chemistry; Organisk kemi;

   Sammanfattning : [FeFe]-Hydrogenases (H2ases) are metalloenzymes that can catalyze the reversible reduction of protons to molecular hydrogen as part of the metabolism of certain cyanobacteria and green algae. Due to the low availability of the enzyme, synthetic complexes that mimic the natural active site in structure, function and activity are highly sought after. LÄS MER

7. 20. Stepping into Catalysis : Kinetic and Mechanistic Investigations of Photo- and Electrocatalytic Hydrogen Production with Natural and Synthetic Molecular Catalysts

   Författare :Daniel Streich; Leif Hammarström; Reiner Lomoth; Clifford Kubiak; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Artificial photosynthesis; photocatalysis; electrocatalysis; hydrogen production; proton reduction; hydrogenase; iron complex; active site model; catalytic mechanism; transient absorption; spectroscopy; electrochemistry; cyclic voltammetry; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

   Sammanfattning : In light of its rapidly growing energy demand, human society has an urgent need to become much more strongly reliant on renewable and sustainable energy carriers. Molecular hydrogen made from water with solar energy could provide an ideal case. LÄS MER