Click here for a PDF version of the abstract instructions, plus a sample abstract.


At the abstract submission website:

  1. The presenting author should enter all contact information and ensure that it is accurate.
  2. Enter a title for your presentation in the abstract title box. Rich text may be used.
  3. Enter the author information in the authors and author locations box. Rich text may be used.
  4. Enter your abstract in the abstract box (see abstract formatting instructions below). You may type text directly into this box, or copy and paste plain ASCII text and add any rich text formatting that you may require.
  5. Graphics (a single picture) can be included via the upload feature. Graphics should be in jpg or png format.

Instructions for authors and author locations:

  1. List of authors, separated by commas: given name, initial(s), surname. Underline the presenting author's name.
  2. Numbered list of institutions/businesses and short addresses, with carriage return after each institution. Indicate the address of each author by placing the appropriate number (in superscript font) after that author's name in the list (see sample abstract below).

Instructions for abstract structure:

  1. Abstract text (no more than 300 words)
  2. References/bibliography (optional) - citations to references in the text should be made with superscripted numbers (see sample abstract below).
  3. Enter abstract text into the abstract box on the website: please use superscript, subscript, italics, bold and underline where appropriate.
Sample Abstract

Title (entered in title box):

Multi-Frequency EPR Analysis of Dipolar and Exchange Interactions Between Managese and Tyrosine In The S2 Yz State of Photosystems II

Authors and author locations (entered in authors box and author locations box):

If you have authors from multiple locations, departments or campuses:

Author list:
K.V. Lakshmi,1 Sandra S. Eaton,1 George H. Johanssen2 and Helmut Schmidt3

Authors’ locations:
1. University of Denver, Department of Chemistry, Denver, CO 80208-2436
2. University of Southern Denmark, Department of Physics and Chemistry, 5230 Odense M, Denmark
3. University of Saskatchewan, Department of Physics, Saskatoon, SK, S8K 4N5

If all authors are in the same department or university:

Author list:
Anthony R. Sandre, Michael J. Jaroszewicz, Karen E. Johnston and Andrew M. Namespetra

Authors’ locations:
University of Windsor, Department of Chemistry and Biochemistry, Windsor, ON, Canada N9B 3P4

Abstract (entered in abstract box):

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 arisesn 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 = ••• 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.