An amphoteric compound based on a sterol skeleton, the 3-position of the sterol ring system being substituted by one or more amphoteric groups having an isoelectric point of between about 4 and 9, together with liposomes containing such compounds and their uses. In the method, an ultraviolet-curable resin paste containing an electroless plating catalyst is applied to a surface of a transparent substrate, and the resulting printed pattern is cured by irradiation of ultraviolet light to form a resin pattern. The MEM device, which utilizes leveraged bending to provide a relatively-large vertical displacement up to several microns for the light-reflective plate, has applications for forming an electrically-programmable diffraction grating or a micromirror array. Also featured is a method of using the device to remove a substance from liquid by adsorption andor ion exchange. The method includes obtaining an image including a face, obtaining information about whether a preset condition is satisfied after the image is obtained, obtaining location information of a face part in the image when the preset condition is satisfied, and obtaining a synthesis image by adding an image corresponding to the satisfied condition at a location of the face part to the image.