Abstract
The kinetic response of bacterial growth to an inhibitor concentration and/or environmental temperature changes was investigated. Microorganisms have a physiological state which adapts to a given environment, and they need a process to transfer to a new physiological state when the environmental condition changes. As an index of the physiological state, the cellular mass at the time of the initiation of the deoxyribonucleic acid (DNA) replication was chosen. From this viewpoint, a simple relation between the unbalanced growth behavior and the physiological state is proposed as being able to describe unbalanced growth under inhibitory and temperature changes. Applying this relation and using ethanol as an inhibitor, the calculated values of unbalanced growth after changes of ethanol concentration and/or temperature could simulate the experimental data with high accuracy. This method might also be applicable for forecasting profiles of unbalanced growth in environmental water or wastewater, which contains complex or unknown materials.
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