The Polarized Photoacoustic Spectra of Rhodobacter Sphaeroides Cells Embedded in Polymer and Strongly Irradiated by Polarized Radiation
| Autor: | K. Klecha, Jacek Goc |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Quantitative Biology::Biomolecules
biology Physiology Physics::Medical Physics Plant Science Chromophore biology.organism_classification Photochemistry Spectral line Light-harvesting complex Absorbance chemistry.chemical_compound Rhodobacter sphaeroides chemistry Bacteriochlorophyll Irradiation Anisotropy |
| Zdroj: | Photosynthetica. 39:461-465 |
| ISSN: | 1573-9058 0300-3604 |
| DOI: | 10.1023/a:1015103015297 |
| Popis: | The cells of purple photosynthetic bacterium Rhodobacter sphaeroides embedded in stretched polymer films were irradiated by strong polarized "white light" with an electric vector parallel to the direction of film stretching. The polarized absorption and photoacoustic spectra before and after strong irradiation were measured. Measurements of absorbance showed no confident anisotropy before and after strong irradiation. In contradiction, the photoacoustic method showed after strong irradiation some changes in anisotropy of thermal deactivation due to the perturbation of the fate of excitations. The increase in yield of thermal deactivation, higher in a region of light-harvesting complex 2, can be explained by the irreversible changes in the conformation of the complexes due to strong irradiance reported up to now predominantly for thylakoid antenna complexes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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