The present invention relates to a process for the polyol-type synthesis of nanoparticulate magnetite starting from mixtures of Fe0 and FelIII in the presence of a mineral acid. A master device may provide a multicast service to active slave devices during a Bluetooth piconet connection. The control unit has a locking element which, when unlocked by the actuating element via the control element, releases the trajectory for the control device to be actuated. Trial assignments for protein-ligand nuclear Overhauser effect interactions are also produced by the method. Further, the pedal assembly includes an electric motor 20 to create opposing force.