Sökning: "cis-trans isomerization"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden cis-trans isomerization.

1. 1. Experimental and Theoretical Studies of Cis-Trans Photoisomerizations and Conditions for Effective Catalysis

   Författare :Helene Möllerstedt; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; catalysis; triplet state; quantum chain process; cis-trans isomerization; adiabatic; potential energy surface; density functional theory; energy transfer;

   Sammanfattning : Triplet-sensitized cis-trans photoisomerizations have been investigated both experimentally and theoretically. Mapping of the reaction path for isomerization of 1,4-bis(1-propenyl)benzene (1) on the triplet state energy surface has been done by quantum yield measurements and laser flash photolysis. LÄS MER

3. 2. Catalysis of Quantum Chain Photoisomerizations: Calculations of Triplet Energy Surfaces and Measurements of Quantum Yields

   Författare :Maria Brink; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; triplet state; density functional theory; potential energy surface; cis-trans isomerization; adiabatic isomerization; catalysis;

   Sammanfattning : Triplet state cis-trans photoisomerizations of olefins is the theme of this thesis, and the goal is to make the isomerizations as efficient as possible. The shape of the triplet potential energy surface (T1 PES) is essential for this, and the possibility of calculating these T1 PESs for two smaller olefins, using the computationally inexpensive density functional theory (DFT) methods, was investigated. LÄS MER

4. 3. Peptidyl-prolyl cis-trans Isomerases in the Chloroplast Thylakoid Lumen

   Författare :Anna Edvardsson; Alexander Vener; Bertil Andersson; Per Gardeström; Linköpings universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Peptidyl-prolyl isomerase activity; Cyclophilin; FKBP; Immunophilin; Chloroplast Thylakoid Lumen; protein characterization; Medical cell biology; Medicinsk cellbiologi;

   Sammanfattning : The Sun is the ultimate energy source on Earth. Photosynthetic organisms are able to catalyze the conversion of solar energy to chemical energy by a reaction called photosynthesis. In plants, this process occurs inside a green organelle called the chloroplast. LÄS MER

5. 4. Organic Photochemistry. Scope and Limitations of Twofold Adiabatic Cis-Trans Isomerizations

   Författare :Ingjald Anger; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : To investigate the scope and limitations of twofold adiabatic cis/trans photoisomerizations, a number of bis-stilbenes and bisstyryl compounds have been prepared and studied in the excited singlet or triplet states. Their structures vary according to the size of the .pi. LÄS MER

7. 5. Structural and Functional Studies of Peptidyl-prolyl cis-trans isomerase A and 1-deoxy-D-xylulose- 5-phosphate reductoisomerase from Mycobacterium tuberculosis

   Författare :Lena M Henriksson; Torsten Unge; Sherry L. Mowbray; Barbara Seaton; Uppsala universitet; []
   Nyckelord :Molecular biology; Mycobacterium tuberculosis; Rv0009; peptidyl-prolyl cis-trans isomerase; Rv2870c; 1-deoxy-D-xylulose-5-phosphate reductoisomerase; non-mevalonate pathway; DOXP MEP pathway; X-ray crystallography; Molekylärbiologi;

   Sammanfattning : Mycobacterium tuberculosis, the causative pathogen of tuberculosis, currently infects one-third of the world’s population, resulting in two million deaths annually. This clearly shows that tuberculosis is one of the most serious diseases of our times. LÄS MER