Microbial interaction in a symbiotic bioprocess of lactic acid bacterium and diary yeast

Authors:
Hiroshi Shimizu;Sunao Egawa;Agustin K. Wardani;Keisuke Nagahisa;Suteaki Shioya
Affiliations:
Dept. of Bioinformatic Engineering, Graduate School of Information Science and Technology, Osaka University, Suita, Osaka, Japan;Dept. of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan;Dept. of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan;Dept. of Bioinformatic Engineering, Graduate School of Information Science and Technology, Osaka University, Suita, Osaka, Japan;Dept. of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
Venue:
BioADIT'06 Proceedings of the Second international conference on Biologically Inspired Approaches to Advanced Information Technology
Year:
2006

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Abstract

In symbiotic processes, different organisms coexist stably and interact by sharing with same metabolites and environmental conditions. A symbiotic process of a lactic acid bacterium, Lactococcus lactis sub species lactis (ATCC11454) and diary yeast Kluyveromyces marxianus is studied in this paper. A mathematical model of the symbiotic process composed of two microorganisms is developed by integrating two pure cultivation models. A cascade pH controller coupled with the dissolved oxygen (DO) control is newly developed and lactate consumption activity of K. marxianus is controlled by changing the DO concentration. The pH and lactate are kept stably at constant levels and both microorganisms grow well. Stability of this symbiotic process with disturbance of inoculums sizes of both microorganisms is investigated. The dynamic behavior of fusion process of independent two bionetworks is also discussed.