Excited state energy transfer pathways in photosynthetic reaction centers. 4. asymmetric energy transfer in the heterodimer mutant

Article Abstract:

Asymmetric energy transfer by direct observation of (super 1)B emission in the heterodimer mutant and by the observation of the rise of (super 1)D emission following preferential excitation of (theta)(sub M) or B(sub L) in the M202HL/M182HL mutant is presented. The results suggest that singlet energy transfer from the monomeric chromophores along the L and M branches to the heterodimer special pair is asymmetric and faster.

Observations, Chemistry, Physical and theoretical, Physical chemistry, Energy transfer, Structure

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Enhancement of the fluorescence of the blue fluorescent proteins by high pressure or low temperature

Article Abstract:

The suppression of chromophore mobility by increasing hydrostatic pressure or by decreasing temperature can enhance the fluorescence quantum yield of the proteins without significantly affecting their absorption properties or the shape of the fluorescence spectra. It is concluded that the interaction plays a very important role in achieving the high fluorescence exhibited by green fluorescent protein.

Analysis, Electric properties, Plant proteins, Fluorescence spectroscopy, Hydrostatics

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Excited state energy transfer oathways in photosynthetic reaction centers. 3. Ultrafast emission from the monomeric bacteriochlophylls

Article Abstract:

Ultrafast singlet excited state energy transfer in bacterial photosynthetic reaction centers is studied. Rise of spontaneous fluorescence is observed within 100Fs of excitation of monomeric bacteriopheophytins.

Usage, Bacteria, Photosynthetic, Photosynthetic bacteria, Excited state chemistry, Absorption spectra

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