题目：Elucidation of Anaerobic Biocorrosion Mechanisms

　　报告人：Professor Tingyue Gu

　　　　　　Department of Chemical and Biomolecular Engineering, 
　　　　　　Institute for Corrosion and Multiphase Technology, 
　　　　　　Ohio University, Athens, Ohio 45701, USA

　　时间：2014年12月24日 （周三） 10：00-12：00

　　地点：李薰楼468会议室

　　Abstract

　　Biofilms are responsible for most biocorrosion (also known as Microbiologically Influenced Corrosion or MIC) cases. Anaerobic MIC occurs even in open-air systems because an aerobic biofilm can provide an anaerobic local environment for an anaerobic biofilm to grow underneath. There are two basic types of anaerobic MIC. Type I MIC involves electrogenic biofilms that transport extracellular electrons released by the oxidation of an energetic metal such as elemental iron (Fe⁰) across the cell wall for the reduction of an existing electron acceptor (oxidant) such as sulfate and nitrate in the cytoplasm. This respiration process produces energy for biofilm maintenance. The bottom layer sessile cells in a biofilm are prone to local carbon source (electron donor) starvation. They may switch to Fe⁰ as an alternate electron donor and thus causing corrosion. In Type II MIC, oxidants such as proton and free organic acids are secreted by biofilms. They attack Fe⁰ extracellularly without biofilm catalysis. These corrosive microbes are usually fermentative microbes.  This presentation uses bioelectrochemical theories and experimental data to demonstrate that different types of MIC can occur under different environmental conditions for the same metal. It helps the understanding of basic MIC mechanisms, which is important to MIC forensics and MIC mitigation.

　　Short biographical sketch

　　Prof. Tingyue Gu obtained his B.S. degree in Chemical Engineering from Zhejiang University in 1985. He was awarded a Ph.D. degree in Chemical Engineering by Purdue University in 1990. He worked for Miller Brewing Company in Milwaukee, Wisconsin for one year before joining Ohio University in 1992, where he is currently a full professor. He has served as an ad hoc reviewer for over 80 journals since 2014. He also served as proposal reviewers for many funding agencies including those in Australia, China (“863 Project”), France, Germany, Hong Kong, Italy, Middle East, Portugal, United Nations and USA. His research interests encompass biocorrosion, bioelectrochemistry, bioenergy and bioseparations. He is a world leader in MIC research as evidenced by the theories and the mechanistic MIC model developed by him. He is also a leading researcher in liquid chromatography modeling and scale-up for protein purifications. His liquid chromatography simulation software (Chromulator) has been used in over 34 countries and licensed by several leading biopharmaceutical companies such as Pfizer, Wyeth, Novo Nordisk, Amgen, Genentech and Chiron. The second edition of his liquid chromatography monograph will be published in early 2015 by Springer.