The key elements in this type of experiment are selectivity in the excitation and probe mechanisms and polarization information. All of these ingredients are being developed along with ultrafast time resolution to follow the pathways of energy transfer in a number of examples where cofactors are relatively nearby and the transfer is not necessarily predictable from Fvrster theory. One example is the reaction center. Excitation of the bacteriopheophytin or the accessory bacteriochlorophyll results in rapid energy transfer to the special pair followed by electron transfer. A detailed study of these processes is underway, aimed at characterizing the states of the supermolecule. In order to do a complete job of measuring anisotropies at all possible excitation wavelengths we are constructing an OPA device that can be scanned over the 500-950 nm region. This construction is now underway.

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR001348-17
Application #
6281044
Study Section
Project Start
1998-08-01
Project End
1999-07-31
Budget Start
1997-10-01
Budget End
1998-09-30
Support Year
17
Fiscal Year
1998
Total Cost
Indirect Cost
Name
University of Pennsylvania
Department
Type
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
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