MONDAY, FEBRUARY 9

"Ab-initio Theory of Magnetic Susceptibility and of NMR Chemical Shifts in Solids and Liquids" (condensed, atomic, and molecular physics), Francesco Mauri, Institut Romand de Recherche Numerique en Physique des Materiauz (France) and University of Geneva (Switzerland), 3:30 p.m., 339 Davey Laboratory, Department of Physics (863-0163).

"Biochemical and Structural Characterization of Photosynthetic Energy and Electron Transfer Proteins," Cherly Kerfeld (faculty candidate), University of California at Los Angeles, 4:00 p.m., 101 Althouse Laboratory, Department of Biochemistry and Molecular Biology (865-3072).

TUESDAY, FEBRUARY 10

"From Model Surfaces to Catalysts (and Back)," Mark Barteau, University of Delaware, 10:00, a.m., 140 Fenske Laboratory, host: Ali Borhan, Department of Chemical Engineering (865-7847).

"Phonon Softening and Superconductivity in Tellurium Under Pressure" (condensed, atomic, and molecular physics), Francesco Mauri, Institut Romand de Recherche Numerique en Physique des Materiauz (France) and University of Geneva (Switzerland), 11:00 a.m., 339 Davey Laboratory, Department of Physics (863-0163).

"A=B, as Easy as 1+2=3?" Scott Ahlgren, Penn State, 1:00 p.m., 113 McAllister Building, Department of Mathematics (865-7527).

"The Singularity Inside Black Holes," Lior Burko, Technion-Israel Institute of Technology (Israel), 2:00 p.m., 339 Davey Laboratory, Center for Gravitational Physics and Geometry (863-9605).

"Conifolds in the Linear Sigma Model" (elementary particles and fields), Tristan Hubsch, Howard University, 3:30 p.m., 339 Davey Laboratory, Department of Physics (865-4376).

"Diet, Genetics, and Obesity," Jules Hirsch, The Rockefeller University, 4:00 p.m., S-209 Henderson Building, Graduate Program in Nutrition and Life Sciences Consortium (865-3448 or 863-4576).

"Gromov's Characterization of Nilpotent Groups by Growth: An Introduction," Alexander Furman, Penn State, 4:00 p.m., 309 Boucke Building, Department of Mathematics (865-7527).

"Pathophysiology of Obesity," Jules Hirsch, the Rockefeller University, 4:00 p.m. 101 Thomas Building (with videoconferencing links to other campuses), Life Sciences Consortium (863-3650).

"Local Rigidity of Weakly Hyperbolic Actions of Higher-Rank Semisimple Lie Groups and Their Lattices, II," Nanian Qian, Yale University, 6:00 p.m., 113 McAllister Building, Department of Mathematics (865-7527).

WEDNESDAY, FEBRUARY 11

"Elongation Factor in 1-Alpha and the Microtubule Cytoskeleton," Richard Moore, Penn State, 12:20 p.m., 106 Wartik Laboratory, Intercollege Graduate Program in Plant Physiology (865-0323).

"Filling the Gap Between Floral Homeotic Genes and Morphogenesis: Target Genes of Apetala3/Pistillata," Robert Sablowski, California Institute of Technology at Pasadena, 4:00 p.m., 8 Mueller Laboratory, host: Sarah M. Assmann, Department of Biology (863-9579).

"Gamma Ray Bursters," Dale Frail, National Radio Astronomy Observatory, 4:00 p.m., 541 Davey Laboratory, host: Peter Meszaros, Department of Astronomy and Astrophysics (865-0418).

"Atoms Where You Want Them" (Distinguished Materials Physics Lectures), Donald Eigler, IBM Almaden Research Center, 8:00 p.m., 119 Osmond Laboratory, Center for Materials Physics (865-3693).

THURSDAY, FEBRUARY 12

"The Structure and K-theory of C*-algebras Arising from Boundary Actions of Groups on Affine Buildings," A. Guyan Robertson, University of Newcastle (Australia), 11:15 a.m., 3 White Building, Department of Mathematics (865-7527).

"Chromatin Domains Involved in Yeast Mating Type Regulation," Kerstin Weiss, Penn State, 11:15 a.m., 101 Althouse Laboratory, Department of Biochemistry and Molecular Biology (865-3072).

"Design by Directed Evolution," Frances H. Arnold, California Institute of Technology, 12:15 p.m., S-5 Osmond Laboratory, Department of Chemistry (863-0889).

"Understanding Superspace: Differential Invariant Theory in the Large," Raymond Puzio, Penn State, 1:00 p.m., 339 Davey Laboratory, Center for Gravitational Physics and Geometry (863-9605).

"Atomic-Scale Perspective of Condensed Matter Science: A New View From a Cold STM" (Distinguished Materials Physics Lectures), Donald Eigler, IBM Almaden Research Center, 3:30 p.m., 101 Osmond Laboratory, Center for Materials Physics (865-3639).

"Biochemical Bases of Tritrophic Interactions," Jack Schultz, Penn State, 3:45 p.m., 112 Buckhout Laboratory, Intercollege Graduate Program in Ecology (863-7221).

"Hopf Algebras," Victor Brunsden, Penn State, 5:00 p.m., 101 Community Arts Center (Penn State Altoona Campus), host: Hossien Movahedi-Lankarani, Department of Mathematics (863-0695).

FRIDAY, FEBRUARY 13

"Closed-loop Dynamics: Two Computational Case Studies," Yannis Kevrekidis, Princeton University, 3:30 p.m., 102 McAllister Building, host: John Lopez, Department of Mathematics (865-2491).

"Gromov's Characterization of Nilpotent Groups by Growth: Continued," Alexander Furman, Penn State, 4:00 p.m., 320 Boucke Building, Department of Mathematics (865-7527).

SATURDAY, FEBRUARY 14

"Attention Deficit Disorders" (Frontiers of Science Lecture), Robert E. Kennedy, neuropsychological consultant at Centre Community Hospital and clinical psychologist, 11:00 a.m., Kern Graduate Center Auditorium, Eberly College of Science (863-4682). http://www.science.psu.edu/frontiers/index.html

SUNDAY, FEBRUARY 15

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This issue of Science Seminars was produced by Barbara K. Kennedy and Susan Kemper.