50th ROCKY MOUNTAIN CONFERENCE
ON ANALYTICAL CHEMISTRY

 Abstract Instructions

STEP BY STEP INSTRUCTIONS FOR COMPLETING YOUR ABSTRACT
 
 
1) Title of Paper. Use correct punctuation at the end.
2) Author's full name using first name first. Use a comma after the full name.
3) Business name. Use a comma after the business name.
4) Your business mailing address (address, city, state, zip)
5) If more than one author, separate by semi-colon, after each author's mailing address. Underline the speaker's name if more than one author.
6) SPACE
7) Abstract
8) SPACE
9) Indicate which symposia you desire to present for
10) Indicate whether oral session or poster session
11) Indicate name, business, mailing address, phone, fax and e-mail for the primary contact
 
 
SAMPLE
 
Multi-Frequency EPR Analysis of Dipolar and Exchange Interactions Between Managese and Tyrosine In The S2 Yz State of Photosystems II. K.V. Lakshmi, Yale University, Department of Chemistry, New Haven, CT 06520-8107; Sandra S. Eaton, University of Denver, Department of Chemistry, Denver, CO 80208-2436; Harry A. Frank, University of Connecticut, Department of Chemistry, Storrs, CT 06269-4060
 
Acetate-inhibited photosystem II, upon room temperature illumination, exhibits a 240 G wide X-band EPR signal at 10 K.1 This EPR signal arises from an interaction between the S2 state of the Mn4 cluster and an oxidized tyrosine residue, Yz.2 In the present study, the exchange and dipolar interactions between the two paramagnetic species are simulated at X and Q-band frequencies utilizing second-order perturbation theory.3 The positions and relative intensities of the hyperfine lines in the S = ½ S2 -state multiline EPR signal are accurately simulated by including g-anisotropy and four sets of axially symmetric 55Mn hyperfine tensors. These parameters are then used to simulate the dipolar and exchange interactions giving rise to the broad experimental S2 Yz EPR signal at X and Q-band frequencies. A precise distance determination between the Mn4 Cluster and Yz in the O2-evolving complex better enables us to elucidate the direct involvement of Yz in water-oxidation chemistry. Supported by NIH GM32715 and GM36442 (Yale) and NIH GM21156 (Denver).
1. Boussac and Rutherford, Biochem., 1988, 27, 3476.
2. Tang et al., J. Amer. Chem. Soc., 1996, 118, 7638.
3. Eaton et al., J. Magn. Res., 1983, 52, 435.
 
EPR Symposia
Oral Session
Sandra Eaton, University of Denver, Department of Chemistry & Biochemistry, Denver, CO 80208-2436, phone 303-871-3102, fax 303-871-2254, seaton@du.edu
 
 
WHERE & WHAT TO SUBMIT
 
Send the electronic version of the abstract before May 1, 2008 (June 15, 2008 for posters) as an e-mail attachment to abstracts@rockychem.com. Please put "50th RMC Abstract - (insert appropriate symposia)" in the subject line.
 
 

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