A feedforward-feedback substrate controller based on a Kalman filter for a fed-batch cultivation of Escherichia coli producing phytase. - M. Arndt; S. Kleist; G. Miksch; Karl Friehs; Erwin Flaschel; Jorge O. Trierweiler; Bernd Hitzmann (Comput. Chem. Eng., 2005)

A machine vision system for automated non-invasive assessment of cell viability via dark field microscopy, wavelet feature selection and classification. - Ning Wei; Erwin Flaschel; Karl Friehs; Tim W. Nattkemper (BMC Bioinform., 2008)