Chlorosomes are the main antenna system of the green sulfur bacterium Chl. tepidum. The pigment composition of chlorosomes is principally Bchlc while the relative amount of Bchla is about 1%. Chlorobactene is the major carotenoid. We have used FDMR and ADMR in zero field to detect triplets formatiion under photoexcitation of isolated chlorosomes with the aim of throwing light on energy transfer process and pigment interactions. Moreover EPR experiments at different microwave frequencies (9-300 GHz) have been done, after chemical oxidation of the chlorosomes, using the cation as a tool to investigate the pigment organization.
Electron Magnetic Resonance of the chlorosomes from green sulfur bacterium Chlorobium tepidum
MANIERO, ANNA LISA;
1998
Abstract
Chlorosomes are the main antenna system of the green sulfur bacterium Chl. tepidum. The pigment composition of chlorosomes is principally Bchlc while the relative amount of Bchla is about 1%. Chlorobactene is the major carotenoid. We have used FDMR and ADMR in zero field to detect triplets formatiion under photoexcitation of isolated chlorosomes with the aim of throwing light on energy transfer process and pigment interactions. Moreover EPR experiments at different microwave frequencies (9-300 GHz) have been done, after chemical oxidation of the chlorosomes, using the cation as a tool to investigate the pigment organization.
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