Abstract: Methods for transcutaneous and non-bloody in vivo determination of an analyte in blood which includes spectroscopically generating at least one first signal corresponding to at least one analyte quantity in a region of a body and at least one second signal corresponding to at least one water quantity in the region of the body, determining the at least one analyte quantity based on the at least one first signal and the at least one water quantity based on the at least one second signal, calculating a concentration of the analyte in water by forming a ratio of an analyte value calculated on the basis of the at least one analyte quantity and a water value calculated on the basis of the at least one water quantity and calculating a concentration of the analyte in blood based on the ratio of the analyte value and the water value.

Abstract: An apparatus for recording data on a recording carrier includes a recording comb and a selection circuit. The recording comb is formed by a plurality of juxtaposed, insulated electrodes which can be individually controlled by the selection circuit. A grid-like contact field is provided on the electrodes and has a plurality of staggered contact surfaces. Each contact surface extends over a plurality of electrodes whereof only one electrode is bared.