Introduction to the Proceedings of the Eighteenth Symposium on Biotechnology for Fuels and Chemicals, Brian H. Davison, Charles E. Wyman, and Mark Finkelstein. Session 1: Thermal, Chemical, and Biological Processing. Introduction to Session 1, Mark T. Holtzapple and Robert Torget. Lime Pretreatment of Switchgrass, Vincent S. Chang, Barry Burr, and Mark T. Holtzapple. Ammonia Recycled Percolation as a Complementary Pretreatment to the Dilute-Acid Process, Zhangwen Wu and Y. Y. Lee. Preliminary Study of the Pyrolysis of Steam Classified Municipal Solid Waste, John M. Sebghati and Michael H. Eley. Two-Phase Model of Hydrolysis Kinetics and Its Applications to Anaerobic Degradation of Particulate Organic Matter, Vasily A. Vavilin, Sergei V. Rytov, and Ljudmila Ya. Lokshina. Preprocessed Barley, Rye, and Triticale as a Feedstock for an Integrated Fuel Ethanol-Feedlot Plant, Krystyna Sosulski, Sunmin Wang, W. M. Ingledew, Frank W. Sosulski, and Juming Tang. Session 2: Biological Research. Introduction to Session 2, Valerie Sarisky-Reed and Jonathan Woodward. A Stable Lipase from Candida lipolytica: Cultivation Conditions and Crude Enzyme Characteristics, Fatima Ventura Pereira-Meirelles, Maria Helena Miguez Rocha-Leao, and Geraldo Lippel Sant' Anna, Jr. Glucoamylase Isoenzymes Tailoring Through Medium Composition, Jose G. Silva, Jr., Hilton J. Nascimento, Valiria F. Soares, and Elba P. S. Bon. Regulation of Phosphotransferases in Glucose- and Xylose-Fermenting Yeasts, Vina W. Yang and Thomas W. Jeffries. Diminished Respirative Growth and Enhanced Assimilative Sugar Uptake Result in Higher Specific Fermentation Rates by the Mutant Pichia stipitis FPL-061, Hassan K. Sreenath and Thomas W. Jeffries. Production of Xylitol from D-Xylose by Debaryomyces hansenii, Jose M. Dominguez, Cheng S. Gong, and George T. Tsao. Production of 2,3-Butanediol from Pretreated Corn Cob by Klebsiella oxytoca in the Presence of Fungal Cellulase, Ningjun Cao, Youkun Xia, Cheng S. Gong, andGeorge T. Tsao. Oxygen Sensitivity of Algal H2-Production, Maria L. Ghirardi, Robert K. Togasaki, and Michael Seibert. Expression of Ascaris suum Malic Enzyme in a Mutant Escherichia coli Allows Production of Succinic Acid from Glucose, Lucy Stols, Gopal Kulkarni, Ben G. Harris, and Mark I. Donnelly. Reaction Engineering Aspects of a-1,4-D-Glucan Phosphorylase Catalysis: Comparison of Plant and Bacterial Enzymes for the Continuous Synthesis of D-Glucose-1-Phosphate, Bernd Nidetzky, Richard Griessler, Andreas Weinhausel, Dietmar Haltrich, and Klaus D. Kulbe. Simultaneous Enzymatic Synthesis of Gluconic Acid and Sorbitol: Production, Purification, and Application of Glucose-Fructose Oxidoreductase and Gluconolactonase, Bernd Nidetzky, Monika Furlinger, Dorothee Gollhofer, Iris Haug, Dietmar Haltrich, and Klaus D. Kulbe. Production of Hemicellulose- and Cellulose-Degrading Enzymes by Various Strains of Sclerotium Rolfsii, Alois Sachslehner, Dietmar Haltrich, Bernd Nidetzky, and Klaus D. Kulbe. Asparaginase II of Saccharomyces cerevisiae: GLN3/URE2 Regulation of a Periplasmic Enzyme, Elba P.S. Bon, Elvira Carvajal, Mike Stanbrough, Donald Rowen, and Boris Magasanik. Production of a-Terpineol from Escherichia coli Cells Expressing Thermostable Limonene Hydratase, Natarajan Savithiry, Tae Kyou Cheong, and Patrick Oriel. Fermentation of Biomass-Derived Glucuronic Acid by pet Expressing Recombinants of E. coli B, Hugh G. Lawford and Joyce D. Rousseau. Enhanced Cofermentation of Glucose and Xylose by Recombinant Saccharomyces Yeast Strains in Batch and Continuous Operating Modes, Susan T. Toon, George P. Philippidis, Nancy W. Y. Ho, ZhengDao Chen, Adam Brainard, Robert E. Lumpkin, and Cynthia J. Riley. Stabilization and Reutilization of Bacillus megaterium Glucose Dehydrogenase by Immobilization, Madalena Baron, Jose D. Fontana, Manoel F. Guimaraes, and Jonathan Woodward. Optimization of Seed Production for a Simultaneous Saccharification Cofermentation