Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany. awahl@mpi-magdeburg.mpg.de|Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany. awahl@mpi-magdeburg.mpg.de|Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany. awahl@mpi-magdeburg.mpg.de