Dried and ensiled corn were each steeped with aqueous SO2 or water at initial pHs of 4-5; both were also steeped with aqueous SO2 at pH7. Initial steepwater composition or pH had less effect on yields of individual fractions and recoveries of various components than did differences between dried or ensiled corn. Recovery of starch after milling was appreciably higher with ensiled corn. Protein recovery in gluten decreased, but this was partially counterbalanced by increased protein content of the steepwater from ensiled corn. Results using batchwise steeping or a simulated countercurrent procedure were similar, though the latter gave higher starch recoveries.

The symposium reported here was the thirteenth of a series devoted to talks by students on their biochemical engineering research. The first, third, fifth, ninth, and twelfth were at Kansas State University, the second and fourth were at the University of Nebraska–Lincoln, the sixth was in Kansas City and was hosted by Iowa State University, the seventh and tenth were at Iowa State, and the eighth and eleventh were at the University of Missouri–Columbia and Colorado State University, respectively. All symposia have been followed by proceedings edited by faculty of the host institution. Because final publication usually takes place elsewhere, papers here are brief, and often cover research in progress.

Content
Sequential Utilization of Mixed Sugars by Clostridium acetobutylicum, B. Hong, N. H. Choi, and L. T. Fan, Kansas State University

The Effects of Dilution Rate on the Kinetics. of Anaerobic Acidogenesis, C. J. Huang, Colorado State University

Ethanol Production by Zymomonas mobilis in Anaerobic Glucose-Limited Culture: A Yield Study, Mehmet D. Oner, Kansas State University

Hydrolysis of Cellulosics by Enterobacteria, Michael R. Sierks, Iowa State University

The Cellulase System of Chaetomium cellulolyticum, Nikhil Mehta, Colorado State University

DNA Measurement as a Tool for Estimating Biomass Concentration in the Presence of Interfering Solids, Bamidele 0. Solomon, Kansas State University

The Effect of Cellulose Crystallinity on Enzymatic Hydrolysis, Maria S. Bertran, Colorado State University

High Performance Liquid Chromatography of Di- and Trisaccharides, Michael M. Meagher, Iowa State University

Dynamics of Bubble Size .Distributions in Air-Lift Fermentors, c. H. Lee and Snehal A. Patel, Kansas State University

A Thermal Coagulation Study of Alfalfa Leaf Proteins by Differential Scanning Calorimeter, Khalif Ahmed and Bruce Dale, Colorado State University

Thermodynamic Efficiency of Photoautotrophic Growth, Hyeon Y. Lee, Kansas State University

This the tenth in a series of symposia devoted to talks by students on their biochemical engineering research. The first, third, fifth, and ninth were at Kansas State University in Manhattan, the second and fourth were at the University of Nebraska–Lincoln, the sixth was in Kansas City in conjunction with the 81st American Institute of Chemical Engineers National Meeting, the seventh was at Iowa State University in Ames, and the eighth was held at the University of Missouri–Columbia.

Contents
"Combined Autohydrolysis-Organosolv Pretreatment of Lignocellulosic Materials," Robert A. Lewis, Colorado State University

"An Investigation of Cellulase Activity Assays," Minhhuong Nguyen, University of Missouri–Columbia

"Action Pattern of a Xylobiohydrolase from Aspergillus niger," Mary M. Frederick, Iowa State University

"Estimation of Heats of Combustion of Biomass from Elemental Analysis Using Available Electron Concepts," Snehal A. Patel, Kansas State University

"Design of a Wheat Straw to Ethanol Conversion Facility," Michael M. Meagher, Colorado State University

"Effects of Salt, Heat, and Physical Form on the Fermentation of Bananas," Carl Drewel, University of Missouri–Columbia

"Gas Hold-up in the Downflow Section of a Split Cylinder Airlift Column," Vasanti Deshpande, Kansas State University

"Measurement of Michaelis Constants for Soluble and Immobilized Glucoamylase," Robert A. Lesch, Iowa State University

"Kinetics of Alkaline Oxidation and Degradation of Sugars," Alfred R. Fratzke, Iowa State University

"Stability of Cereal Protein During Microbial Growth on Grain Dust," Bamidele O. Solomon, Kansas State University