An actuator for a fluid-dispenser container, e. The dynamic spinal stabilization device includes two or more screw assemblies, each of which include a pedicle screw and a head socket containing a curved internal track that limits the range of motion and center of rotation of the spinal segments stabilized using the device to the physiological levels of a nondegraded spinal segment. When the molar amounts of Ca and Sr are x and y, respectively, and the total number of moles of the elements constituting the A site is 1 mole, 0. The two or more complete columns of blocks are successively accessed by successively accessing the blocks arranged in each of the columns of blocks. In this way, the pattern of the film is transferred to the substrate in a manner dependent on the selectivity of one or both of the etching processes as well as the thickness of the discrete mask layers, or in the case of a continuously graded film, the slope of the stoichiometric change with respect to position in the overall thickness of the film.