A plate-shaped periodic structure is provided that includes at least two aperture portions extending through the periodic structure in a direction perpendicular to a main surface of the periodic structure and periodically arranged in at least one direction along the main surface. These stem cell nutrients have been found to positively affect the skin, liver, brain neurons, pancreas, and the GI tract. A mating surface of the cooling device is positioned adjacent to a mating surface of a thermal component and the solder material is heated at least to its melting point. A coil is fixedly mounted to the base and is selectively energized to draw the armature to the magnetic core.