Intraband energy transfers in the BChl c antenna of chlorosomes from the green photosynthetic bacterium Chloroflexus aurantiacus

Journal Article · Thu Nov 07 00:00:00 EST 1996 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/jp961752b· OSTI ID:420739

Savikhin, S; Struve, W S ^[1]; Zhu, Y; Blankenship, R E ^[2]

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1. Iowa State Univ., Ames, IA (United States)
2. Arizona State Univ., Tempe, AZ (United States)

Two-color absorption difference profiles for the bacteriochlorophyll (BChl) c antenna of chlorosomes from Chloroflexus aurantiacus at 19K show photobleaching/stimulated emission rise features with 300 fs kinetics when the probe wavelength is 30 nm to the red of the excitation wavelength. Similar rise features do not appear at 300 K, or in uphill two-color experiments at 19 K, or when the pump and probe wavelengths are separated by 30nm. This appears to be the first direct observation of downhill electronic energy transfer within light-harvesting BChl c oligomers in intact chlorosomes. 17 refs., 4 figs.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 420739
• Journal Information: Journal of Physical Chemistry, Vol. 100, Issue 45; Other Information: PBD: 7 Nov 1996
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
40 CHEMISTRY
PHOTOSYNTHETIC BACTERIA
ENERGY TRANSFER
COLOR
BLEACHING
STIMULATED EMISSION
ABSORPTION SPECTRA
PIGMENTS
PROTEINS