An electromagnetically induced cutting mechanism provides accurate cutting operations on soft tissues. Medicinal products containing the same which are useful in the treatment of melatoninergic disorders. In its second, unscrewed state, the nut allows adjustment of the cap, arm and support member correspondingly to adjust the orientation of an object mounted by the mounting assembly. Measurements are made with the intracellular presence of such substrate molecules, at some time of interest. Successive pieces having the same slope value are removed.