Search for dissertations about: "acidic protons"

Showing result 1 - 5 of 12 swedish dissertations containing the words acidic protons.

  2. 1. Alkylation and Hydrodearomatization over Zeolite cCatalysts

    Author : Jun-Jun Yuan; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Acid catalysts; ZSM-5 catalysts; ethylbenzene; toluene; temperature; diesel fuel; hydrodearomatization; benzene; acidic protons; activity and selectivity; aqueous ethanol; Pt Y zeolite; gasoline; pressure; GC; diethylbenzene; Hydrocracking; SiO2 Al2O3 ratio; alkylation of aromatics; Brønsted acids;

    Abstract : The alkylation of aromatic compounds is widely used in the large-scale synthesis of petrochemicals, and a great variety of fine chemicals and intermediates. Acid catalysts used for alkylation of aromatic hydrocarbons are Brønsted acids containing acidic protons. READ MORE

  4. 2. Alkylation of benzene/ethanol and toluene/methanol over ZSM-5

    Author : Junjun Yuan; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; alkylation of aromatics; benzene; xylene isomers; toluene; ethanol; zeolites; ethylbenzene; Bronsted acids; acid catalysts; GC; SiO2 Al2O3; acidic protons; ration; activity and selectivity;

    Abstract : .... READ MORE

  5. 3. Effects of Protons and Small Alcohols on the Oxygen-Evolving Complex of Photosystem II

    Author : Paulina Geijer; Biokemi och Strukturbiologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; EPR; pH; methanol; S3; S2; S0; YZ; Mn cluster; Oxygen-evolving complex; S-states; Biochemistry; Metabolism; Biokemi; metabolism;

    Abstract : Higher plants and algae use oxygenic photosynthesis to convert solar energy to reducing equivalents and chemical energy. The ultimate electron donor to oxygenic photosynthesis is water. Oxidation of water to oxygen occurs in the oxygen-evolving complex (OEC) in Photosystem II (PSII). The OEC is composed of four Mn atoms, Ca2+ and Cl-. READ MORE

  6. 4. Structural elements involved in protein-mediated proton transfer : Implications from studies of cytochrome c oxidase

    Author : Ann-Louise Johansson; Martin Högbom; Peter Brzezinski; Bertrand García-Moreno; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; cytochrome c oxidase; proton transfer; Biochemistry; biokemi;

    Abstract : Proton transfer is one of the most common reactions in biological systems. During energy conversion inside a cell, proton transfer is crucial to maintain an electrochemical proton gradient across the cell membrane. This gradient is in turn used to e.g. READ MORE

  7. 5. Physiological regulation of the high-affinity phosphate uptake system in the yeast Saccharomyces cerevisiae

    Author : Johanna Pattison-Granberg; Bengt Persson; Morten Kielland-Brandt; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biochemistry; Biokemi;

    Abstract : Yeast cells can be found in a wide variety of environments, demonstrating that these cells are capable of adapting to changes in the external milieu. Inorganic phosphate (Pi) is an essential nutrient for all organisms and Saccharomyces cerevisiae cells take up phosphate from the external environment via two different systems, i.e. READ MORE