Hole-burning and absorption studies of the LH1 antenna complex of purple bacteria: effects of pressure and temperature

Article Abstract:

The light harvesting 1 (LH1) antenna complex of wild-type chromatophores and a LH1-only mutant of Rhodobacter sphaeroides was examined by combining spectral hole-burning and absorption spectroscopies with pressure and temperature. Results showed that large pressure shifts is mainly due to the electron exchange couplings between neighboring BChl a molecules of the LH1 ring. The temperature-dependent studies showed that the structure of the LH1 complex undergoes a change at 150 K.

Bacteria, Photosynthetic, Photosynthetic bacteria, Absorption of light, Light absorption

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Two-photon-sensitized fluorescence and excitation spectra of photosystem 1 of thermosynechococcus elongatus

Article Abstract:

The study of two-photon excitation spectrum and two photon sensitized fluorescence spectra of photosystem I of thermosynechococcus elongatus are presented. Regardless of the two photon sensitized fluorescence spectrum of PS I does not show increased red chlorophyll fluorescence in comparison to one photon excitation.

Fluorescence spectroscopy

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How fast is excitation energy transfer in the photosystem II reaction center in the low temperature limit? hole burning vs photon echo

Article Abstract:

The hole spectra proves that isolated Ps II RC EET excited wavelengths occurs in the low temperature unit. This spectra does not speak to EET rates for excitation.

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