First, a horizontal nozzle is inserted between an upper mold section and a lower mold section in a horizontally extending state. A position of a dielectric is identified on the basis of differences in electrostatic capacity between the primary electrode and the secondary electrodes, which electrostatic capacity is changed by the dielectric positioned on a surface side of the both electrodes. The user can then determine the effect of the intervention and interactively modify the intervention for improved treatment results. A dimeric dye, such as a dimeric dye capable of forming a hairpin-like structure, may be used to stain andor detect nucleic acids via a release-on-demand mechanism.