MONDAY, DECEMBER 8

"Geography of the Space of Quadratic Rational Maps," Adam Epstein, State University of New York at Stony Brook, 3:30 p.m., 102 McAllister Building, Department of Mathematics (865-7527).

"What Pennsylvania Farmers Face Today: Farmer Needs Through the Eyes of an Extension Agent, a Processing Company Fieldman, and a Crop Improvement Scout," John Esslinger, Extension Agent, Lackawanna County (Pennsylvania), 3:35 p.m., 112 Buckhout Laboratory, Department of Plant Pathology (865-3761).

"Bacteriophage Mu DNA Transposition: Two Chemical Steps By One Active Site, and Coordination of the Reaction Steps by Controlled Assembly of the Protein-DNA Complex," Kiyoshi Mizuuchi, National Institutes of Health, 4:00 p.m., 101 Althouse Laboratory, host: Robert Simpson, Department of Biochemistry and Molecular Biology (865-3072).

TUESDAY, DECEMBER 9

"Adsorption in Carbon Nanotubes," George Stan, Penn State, 12:00 noon, 339 Davey Laboratory, Center for Materials Physics (863-0118).

"Poly (Phenylene-Vinylenes) For Use in Light Aiodes," Clay Kellam, Penn State, 12:15 p.m., S-5 Osmond Laboratory, Department of Chemistry (865-4041).

"The Existence of (r,e)-core Partitions," Lawrence Sze, Penn State, 12:20 p.m., 113 McAllister Building, host: Ken Ono, Department of Mathematics (863-9682).

"Engineering the Secretion Pathway in Insect Cells," Mike Betenbaugh, Johns Hopkins University, 2:30 p.m., Paul Robeson Cultural Center, host: K. Fichthorn, Department of Chemical Engineering (863-4807).

"Azimuthal Asymmetries in Hard Scattering Processes" (elementary particles and fields), Daniel Boer, National Institute for Nuclear Physics and High Energy (The Netherlands), 3:30 p.m., 339 Davey Laboratory, Department of Physics (863-0783).

"Challenges and Opportunities in the Application of Biotechnology to Environmental Problems" (video conferencing with Hershey Medical Center), Burt Ensley, Phytotech Incorporated, 4:00 p.m., 101 Thomas Building, Life Sciences Consortium (863-3650).

"Geometry of Submanifolds," D.R. Orendovici, Penn State, 4:00 p.m., 113 McAllister Building, host: Dima Burago, Department of Mathematics (865-7741).

WEDNESDAY, DECEMBER 10

"Systematics of Dineutus (Coleoptera: Gyrinidae)," R.P. Withington III, Penn State, 11:15 a.m. (coffee at 11:00 a.m.), 504 Agricultural Science and Industries Building, host: K.C. Kim, Department of Entomology (865-1895).

"Symplectic Reduction--An Introduction (continued)," Francois Zeigler, Penn State, 1:25 p.m., 113 McAllister Building, Department of Mathematics (865-7527).

"Tools to Study the Brain Serotonin System: Chemical and Genetic Approaches," Anne Milasincic Andrews (faculty candidate), National Institute of Mental Health, 2:30 p.m., S-5 Osmond Laboratory, Department of Chemistry (865-6553).

THURSDAY, DECEMBER 11

"In Situ Real-Time LEEM Studies of GaN Growth," Ig Tsong, Arizona State University, 11:00 a.m., 301 Steidle Building, Ceramic Science and Engineering Program (865-4992).

"Geometric Invariant Theory and Diophantine Approximations," Roberto Ferretti, Institute for Advanced Study, 11:20 a.m., 104 McAllister Building, host: Winnie Li, Department of Mathematics (865-1669).

"title to be announced," Laurent Freidel, Penn State, 11:30 a.m., 339 Davey Laboratory, Center for Gravitational Physics and Geometry (863-9605).

"The Threat of E. coli," Richard Wilson, Penn State, 3:35 p.m., 16 Agricultural Science and Industries Building, host: L. Sordillo, Department of Veterinary Science (863-5786).

"Responses of Plants and Animals to Timber Harvesting on Non-Industrial Private Lands in Northeastern Pennsylvania," Brad Ross, National Audubon Society, 3:45 p.m., 112 Buckhout Laboratory, host: Rich Yahner, Intercollege Graduate Program in Ecology (863-7221).

"PLAN: Programming Language for Active Networks," Michael Hicks, University of Pennsylvania, 4:00 p.m., 302 Pond Laboratory, Department of Computer Science and Engineering (865-9505).

"Rational Approximation to Algebraic Numbers of Small Height and Applications to Diophantine Equations," Michael Bennett, Institute for Advanced Study, 4:30 p.m., 102 McAllister Building, host: Ken Ono, Department of Mathematics (863-9682).

FRIDAY, DECEMBER 12

"Where Have All the Farm Boys Gone?" Robert Snetsinger, Penn State, 11:15 a.m., 118 Agricultural Science and Industries Building, host: Michael Saunders, Department of Entomology (865-1895).

"Ericoid Mycorrhizae: A Horticulturalist's Path of Questions," Barbara L. Goulart, Penn State, 12:20 p.m., 112 Buckhout Laboratory, Intercollege Graduate Program in Plant Physiology (865-0323).

"Cyclic Cohomology and Index Theory--A Survey," Victor Nistor, Penn State, 2:30 p.m., 117 Boucke Building, Department of Mathematics (865-7527).

"Finite Element Analysis of Non-Convex Variational Problems Modeling Crystalline Solids," Bo Li, University of California at Los Angelos, 3:30 p.m., 102 McAllister Building, host: Jinchao Xu, Department of Mathematics (865-1110).

SATURDAY, DECEMBER 13

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SUNDAY, DECEMBER 14

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