Olaf A. Hougen Symposium,


Edwin N. Lightfoot

The Department of Chemical and Biological Engineering at the University of Wisconsin-Madison is delighted to dedicate this year's Hougen Symposium to Professor Emeritus Edwin N. Lightfoot in recognition of the outstanding leadership he has provided to the developing field of biotechnology over more than 50 years at Wisconsin, and in celebration of his recent receipt of a Presidential Medal of Science.

awarded to

"For vigorous and sustained leadership in developing the fields of biochemical and biomedical engineering, particularly in the areas of blood oxygenation, oxygen diffusion into tissue, mathematical modeling of biological pathways, bioseparations and studies of diabetic responses."

Schedule of Events

Thursday, February 23, 2006
Lectures in Room 1610 Engineering Hall
10:00 a.m. Refreshments (in the lobby)
10:15 a.m. Introduction
10:30 a.m. Carl E. Gulbrandsen
Chemical and Biological Engineering and the Spin-off of Biotechnology Companies from UW-Madison
11:15 a.m. Abraham M. Lenhoff
Optimizing Dynamic Capacity in Protein Ion-Exchange Chromatography by Manipulation of Transport Mechanisms
1:30 p.m. Richard R. Burgess
1) How Ed Lightfoot Taught Me to Speak ChemEse; and 2) Bioseparation of Labile Protein-Protein Complexes by Gentle Immunoaffinity Chromatography
2:15 p.m. Bernhard O. Palsson
New "Dimensions" in Genome Annotation
3:00 p.m. Closing Remarks

Invited Speakers

Carl Gulbrandsen

CARL E. GULBRANDSEN is the managing director of Wisconsin Alumni Research Foundation (WARF), the patent management organization for the University of Wisconsin-Madison.

Dr. Gulbrandsen will review the spin-out of biotechnology companies from the UW-Madison and the contribution, present and future of the Department of Chemical and Biological Engineering.

Abraham Lenhoff

ABRAHAM M. LENHOFF is the Gore Professor of Chemical Engineering at the University of Delaware and received his Ph.D. under Ed Lightfoot's direction in 1984.

Throughput and production rates in chromatography are determined to a large extent by transport of proteins within the porous chromatographic adsorbent particles, which takes the form of hindered diffusion but is also affected by its coupling with adsorption. Professor Lenhoff will examine the interaction of diffusion with adsorption in ion-exchange, which is the most widely used mode of chromatography in bioprocessing. A hierarchy of methods — column experiments, batch uptake measurements and confocal microscopy observations — is used to determine both rates and mechanisms of transport. A clear transition is seen in the transport mechanism under certain conditions, and this is accompanied by a dramatic increase in uptake rate that can have major implications for process efficiency. The underlying cause of this change in mechanism is sought with the use of a set of adsorbents that differ only in surface charge density. The results obtained can assist not only in adsorbent selection and in optimization of operating conditions, but also in designing new adsorbent materials with desirable transport properties.

Richard Burgess

RICHARD R. BURGESS is the James D. Watson Professor of Oncology at the McArdle Laboratory for Cancer Research at UW-Madison.

Professor Burgess will present some recollections of his interactions with and education by Ed Lightfoot: as he founded the UW Biotechnology Center in 1984 and directed it until 1996; in realizing the importance of multidisciplinary thinking in biotechnology; in learning to think about bioseparations like a chemical engineer rather than just as a biochemist; and in playing the role of a technology honeybee. He will then discuss the role of his lab in pioneering the identification and use of special monoclonal antibodies (mAbs) in gentle immunoaffinity chromatography. Immunoaffinity columns containing such "polyol-responsive" mAbs bind antigenic proteins tightly but release them under mild, protein stabilizing conditions. He will describe the preparation, optimization and use of these columns in purifying biologically active, multi-subunit protein complexes.

Bernhard Palsson
BERNHARD O. PALSSON is Professor of Bioengineering and Adjunct Professor of Medicine at the University of California, San Diego, and also received his Ph.D. under Ed Lightfoot's direction in 1984. Traditional genome annotation involves the enumeration of open reading frames and their functional assignment. Ongoing efforts to identify all interactions between these components result in a map of interactions representing a two-dimensional annotation. Professor Palsson will detail the formulation and properties of this matrix and how it can be used as the basis for computing allowable phenotypic functions. Issues associated with the packing of the bacterial genome and the function of the interaction map in three dimensions will also be discussed. Finally, Professor Palsson will consider the issue of genomes changing through adaptive evolution, and describe the full re-sequencing of bacterial genomes to map all genetic changes that occur during adaptation.