A model for modeling electromagnetic response in a conductor and in dielectric, a method of modeling the electromagnetic response in the conductor and dielectric and a program product therefor. The query acceptance unit is configured to accept a retrieval query indicating -dimensional surface in N-dimensional space. In additions, methods are described for modulating detachment of bacterial cells from biofilm by mutating soluble, \u03b2-N-acetylglucosaminidase or altering its expression or activity are also provided. In this context, the actuators are interconnected by a supporting element which is permanently mounted in the fuel injector. 3 times as high as that of the binder resin, or the cleaning member being provided with a heating mechanism for heating the cleaning member as a layer of dirt that has been deposited thereon is increased to a predetermined thickness or as the layer of dirt and the surface temperature of the cleaning member become higher than a predetermined level.