The present invention provides polynucleotides encoding human RNase III and polypeptides encoded thereby. To firmly connect the cylindrical member to the outer member, grooves having an inclination relative to the axial direction of the bearing are formed so that the grooves do not cross one another on the outer surface of the outer member. The blades are connected with and surrounding around the hub. In accordance with a further aspect of the invention, a fuel cell is provided including the electrode of the invention. A chemically active material may be disposed on the current collector. The spring assemblies of the present invention use bow springs made from fiberglassepoxy, graphiteepoxy, or fiberglassnylon instead of traditional coil springs.