University of Georgia
Department of Mathematics
Seminar Schedule
October 31– November 4, 2005
All Seminars are held in Boyd Graduate Studies Bldg. unless otherwise noted.

MONDAY, October 31, 2005

Topology/Geometry
2:30pm, Room 303
Speaker: Mikael Sonne Hansen (Technical University of Denmark, Lyngby, Denmark)
Title of talk: Non-uniform tube representation of protiens
Abstract: Treating the full protein structure is often neither computationally nor physically possible. Instead one is forced to consider various reduced models capturing the properties of interest for a given application. Previous work have used tubular neighborhoods of the C-alpha backbone. However, assigning a unique radius might not correctly capture the volume exclusion - of crucial importance when trying to understand a protein's 3d-structure.

Together with Peter Rogen, I propose a new reduced model of the protein as a tube with varying radius reflecting the positions of atoms. The coarse grained tube representation is well suited considering X-ray crystallographic resolution (~3 A) while non-uniform radius accounts well for the different sizes and positions of side chains. Such a non-uniform tube capture the protein geometry better and has numerous applications in structural/computational biology from the classification of protein structures to sequence-structure prediction.

In the first part of the talk I will address the biological setting and in what ares the non-uniform tube representation of proteins could useful. In the second part (after the promised tea break) I will go into more details concerning the actual model.

Algebra
2:30-3:30pm., Room 410
Speaker: David Hemmer, University of Toledo
Title of talk: "Tilting" modules for symmetric groups?
Abstract: I will discuss my conjecture that the indecomposable self-dual modules for the symmetric group which have filtrations by Specht modules are precisely the class of signed Young modules. If true, then these modules would correspond bijectively with the projective modules for the Schur superalgebra. We prove this conjecture for the irreducible Specht modules, recently classified by Fayers, namely showing that they are actually signed Young modules. We remark that there are modules which have both Specht and dual Specht filtrations which are not self-dual.

Faculty and Graduate Social
3:00pm, Room 409
Coffee, Cookies, Tea

TUESDAY, November 1, 2005

VIGRE-Graduate Student Seminar
2:00p.m., Room 303
No Meeting this week

Number Theory
3:30-5:00pm., Room 304
No Meeting this week

WEDNESDAY, November 2, 2005

Algebraic Geometry
2:30-3:45pm, Room 410
Speaker: TBA
Title: TBA

Faculty and Graduate Social
3:00pm, Room 409
Coffee, Cookies, Tea

VIGRE-Algebra Group
3:45p.m., Room 302

THURSDAY, November 3, 2005

VIGRE – Feynman Diagrams
2:00pm, Room 326

VIGRE – Cardiac Physiology
2:00p.m., Room 640

VIGRE-Algebraic Geometry Group
3:30pm, Room 323

Math Club Meeting
5:30pm, Room 304
Speaker: Dr. Neil Lyall, University of Georgia
Title of talk: Ramsey’s theorem, exponential sums, and two contrasting proofs of Fermat’s last theorem (mod p).

FRIDAY, November 4, 2005

Probability Theory
2:30-4:00pm, Room 303
Speaker: Jie Yu, University of Georgia
Title of talk: Hedging with Basis Risk (cont.)