Application of pH and pO2 Probes During Bacillus caldolyticus Fermentation: An Additional Approach for Improving a Feeding Strategy

My colleague Wolf-Dieter Deckwer and I spent very productive time as PhD students in the Institut für Technische Chemie, Technische Universität, Berlin, Germany between 1971 and 1976 working together on modelling of hydrodynamics, mass and heat transfer in bubble columns. During this time we published some very good papers especially in the area of absorption and reaction of isobutene in sulphuric acid. Later, we both moved into Biotechnology and met frequently at diverse meetings and conferences. Wolf-Dieter’s analysis and discussions during these politically turbulent times in West-Berlin were distinctive for me and for the whole generation of PhD students in our institute at this time. Friendly contacts with him and his family lasted over 30 years. I am glad and proud to belong to this group of (formerly) young scientists. M. K. Popovic