Photosynthetica 2001, 39(3):461-465 | DOI: 10.1023/A:1015103015297

The Polarized Photoacoustic Spectra of Rhodobacter Sphaeroides Cells Embedded in Polymer and Strongly Irradiated by Polarized Radiation

J. Goc1, K. Klecha1
1 Institute of Physics, Faculty of Technical Physics, Poznań University of Technology, Poznań, Poland

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.

Additional key words: absorption; bacteriochlorophyll; carotenoids; chromophore; light-harvesting complex; purple photosynthetic bacteria; thermal deactivation

Published: September 1, 2001  Show citation

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Goc, J., & Klecha, K. (2001). The Polarized Photoacoustic Spectra of Rhodobacter Sphaeroides Cells Embedded in Polymer and Strongly Irradiated by Polarized Radiation. Photosynthetica, 39(3), 461-465. doi: 10.1023/A:1015103015297
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