Sökning: "protonation states"

Visar resultat 16 - 20 av 25 avhandlingar innehållade orden protonation states.

1. 16. Understanding structural features of biomolecular interactions : from classical simulations to ab initio calculations

   Författare :Yossa Dwi Hartono; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : The structures of biomolecules and their interactions dictate their functions. In this thesis, five papers are presented to illustrate how the dynamics of biomolecules can be investigated and derivation of desired thermodynamic quantities obtained by utilising a diverse range of computational techniques, from simulations utilising classical mechanical descriptions to calculations employing quantum mechanical descriptions. LÄS MER

3. 17. Structural Insights at Sub-Ångstrom, Medium and Low Resolution: Crystallization of Trypsin, Bacterioferritin, Photosynthetic Reaction Center, and Photosynthetic Core Complex

   Författare :Weixiao Yuan Wahlgren; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein crystallization; cubic phase; sponge phase; bicelle; trypsin; bacterioferritin; reaction center; core complex; photosynthesis;

   Sammanfattning : The catalytic action of serine proteases depends on the interplay of a nucleophile, a general base and a general acid. The catalytic triad is composed of serine, histidine and aspartate residues. The serine acts as a nucleophile while the histidine plays a dual role as the general base or acid at different steps of the reaction. LÄS MER

4. 18. Insight into Catalytic Intermediates Relevant for Water Splitting

   Författare :Mohammad Mirmohades; Leif Hammarström; Reiner Lomoth; Sascha Ott; Christopher Pickett; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Catalysis; Artificial photosynthesis; Molecular biomimetics; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

   Sammanfattning : Catalysis is an important part of chemistry. This is also reflected in the chemical industry where 85-90 % of all products are made catalytically. Also nature employs catalysts, i.e. LÄS MER

5. 19. The Oxygen Evolving cycle in Photosystem II studied with EPR Spectroscopy at different pH and Temperature

   Författare :Susan F Morvaridi; Biokemi och Strukturbiologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kemi; Chemistry; Naturvetenskap; Temperature; Natural science; pH; EPR; S cycle; Photosystem II;

   Sammanfattning : PSII catalyses the light-induced water splitting process which leads to electron transfer through the thylakoid membrane and formation of energy rich molecules. Several redox components including a Mn4Ca, an amino acid residueYZ, two special Chl molecules P680, two Pheo and two quinone molecules participate in this process. LÄS MER

7. 20. Vitamin B6 as a potential antioxidant : a study emanating from UV-B-stressed plants

   Författare :Mikael Ristilä; Åke Strid; Leif Eriksson; Éva Hideg; Örebro universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arabidopsis; UV-B irradiation; pyridoxine; vitamin B6; ROS; Chemistry; Kemi; Chemistry; Kemi;

   Sammanfattning : Increased influx of solar UV-B radiation (280-320 nm), due to a decreasing stratospheric ozone layer, impacts severely on plants. Some of the UV-B effects on plants are related to stress induced by produced reactive oxygen species (ROS). Pyridoxine (vitamin B6) has been reported to be a potential quencher of ROS. LÄS MER