The first International Symposium on Theory and Applica- tion of Ion and Enzyme Electrodes in Biology and Medicine was organized at SchloB Reisensburg near Ulm in 1974. The concept of this meeting was to discuss the theory and applica- tion of carrier operated electrodes within an interdisciplinary group of investigators coming from physical chemistry, or- ganic chemistry, physiology, biochemistry and medicine. Be- cause of its interdisciplinary character, the Symposium proved to be very productive and further meetings based on the same principle were held at the Max-Planck-Institut fUr...