A head drive circuit is adapted to selectively drive piezoelectric elements for ejecting liquid droplets from a liquid jetting head of a liquid jetting apparatus. By selecting particular siRNAs by rational design, one can maximize the generation of an effective gene silencing reagent, as well as methods for silencing genes. The guide groove has a guide pin movably fitted so as to be movable in the front-and-rear direction together with the seat portion with respect to the base portion. Also, the commanded motions for rotational-motion axes are interpolated to obtain interpolated positions for the rotational-motion axes. The touch driving circuit includes a photoelectricity generation unit, an amplification unit, an output control unit and an amplification control unit. The optical recording medium is formed with information tracks on which data pits carrying information data is to be formed, and prepit tracks previously formed with a plurality of prepits.