A column for use in chromatography, the column having a tube with a bore that can contain a packing medium captured between two porous plugs positioned at opposite ends. The photocathode includes a transparent substrate, upon one major side of which is formed one or more large aspect-ratio structures, such as needles, cones, fibers, prisms, or pyramids. The adhesive is comprised a linear and branched isocyanate functional polyether prepolymer wherein the linear and branched isocyanate functional polyether prepolymers are present in the composition at a particular weight ratios an isocyanate functional polyester prepolymer, a plasticizer and filler. The ring gear of gearset couples shaft, which couples the sun gear of gearset.