"The Tetraheme Cytochrome c554 from Nitrosomonas Europaea can function as a Bacterial NO Reductase," Anup K. Upadhyay, Doros T. Petasis, Alan B. Hooper, and Michael P. Hendrich, 12th International Conference on Biological Inorganic Chemistry (ICBIC-12), University of Michigan, Ann Arbor, MI (July 31-August 5, 2005).

"Spectroscopic Studies of the Tetraheme Cytochrome c554 from Nitrosomonas Europaea," D. T. Petasis, Invited Research Seminar, Structural Proteomics in Toronto, University Health Network, University of Toronto (July 20, 2005).

"Rare Earth Crystals as Temperature Probes for Frozen Metalloprotein EPR Samples," D. T. Petasis, Invited Research Seminar, Department of Physics, Colgate University, Hamilton, NY (April 12, 2005).

"Heme Peroxidases as a Model System for an Interdisciplinary Biochemistry Course," D. Segesdy, B. Benedetti, D. T. Petasis, A. M. Kleinschmidt, and L. Vuocolo, 36th Central Regional Meeting of the ACS (CRM 2004), IUPUI, Indianapolis (June 2-4, 2004).

"Accurate Determination of the Temperature of Frozen Metalloprotein EPR Samples Using a Rare Earth Crystalline Thermometer, C. D. Mangini, D. T. Petasis, and W. A. Gunderson, 36th Central Regional Meeting of the ACS (CRM 2004), IUPUI, Indianapolis (June 2-4, 2004).

"Spectroscopic Characterization of Multiheme Proteins from Nitrosomonas Europae," A. K. Upadhyay, D. T. Petasis, D. M. Arciero, A. B. Hooper, and M. P. Hendrich, Gordon Research Conference in Inorganic Chemistry, Salve Regina University, Newport, R. I. (July 13-18, 2003).

"Development of a Rare Earth Crystalline Thermometer for Frozen Metalloprotein EPR Samples," D. M. Kirkwood, D. C. Segesdy, D. T. Petasis, W. A. Gunderson, and M. P. Hendrich, 36h Annual Middle Atlantic Regional Meeting of the ACS (MARM 2003) Princeton, New Jersey (June 9-12, 2003).

"EPR and Mossbauer Spectroscopic Studies of the Tetraheme Cytochrome c554 from Nitrosomonas Europaea," D. T. Petasis, A. K. Upadhyay, and M. P Hendrich, 35th Annual Middle Atlantic Regional Meeting of the ACS (MARM 2002), Fairfax, Virginia (May 28-30, 2002).

"Physical Studies of Proteins from Nitrifying Soil Bacteria," D. T. Petasis, Allegheny College Second Biennial Faculty Intramural Conference, Westfield, NY (May 21-22, 2002).

"X- and Q-band EPR Studies of the Tetraheme Cytochrome c554 from Nitrosomonas Europaea," D. T. Petasis, C. Culver, and M. P. Hendrich, Physics and Biological Systems - Ohio Section Meeting of the APS, Kent State University (April 20-21, 2001).

"X-band EPR of Color Centers in Minerals," D. T. Petasis, J. Gallagher, N. Donnely, P. Whitmore, and M. Wilson, 2001 Division of Atomic, Molecular and Optical Physics Annual Meeting (DAMOP 2001), London, Ontario, Canada (May 16-19, 2001).

"X- and Q-band EPR Study of the Iron Nitrosyl Derivative of the Iron-Quinone Complex of Photosystem II," Y. Sanakis, D. Petasis, M. Hendrich, and V. Petrouleas, Ampere Summer School on "Applications of Magnetic Resonance in Novel Materials," Nafplion, Greece (September 3 - 9, 2000).

"Rare Earth Crystalline Thermometer for Low-Temperature Metalloprotein EPR Samples," D. T. Petasis, M. F. Beals, and M. P. Hendrich, 32nd ACS Central Regional Meeting (CMACS 2000), Covington , KY (May 16-19, 2000).