In one embodiment, a fluid ejection device is configured to receive a signal and ejecting fluid in response thereto, including an ink ejecting nozzle layer having a substrate with first and second surfaces joined along an edge, an insulating feature located on the first surface adjacent the edge and a flexible lead that bends around the edge and lies flush against the insulating feature. A method for detecting a target substance is also described. The key generation algorithm searches the bitmap for equivalent image sets that produce the same bitmaps. The invention also relates to the use of the amphiphile in an agrochemical formulation comprising the amphiphile and a pesticide for controlling phytopathogenic fungi andor unwanted vegetation andor unwanted insect or mite infestation andor for regulating the growth of plants, and finally to plant propagation material comprising the amphiphile.