The opsin made from the OPN1SW gene is more sensitive to light in the blue/violet part of the visible spectrum (short-wavelength light), and cones with this pigment are called short-wavelength-sensitive or S cones. Genetic changes involving the OPN1LW or OPN1MW gene cause red-green color vision defects.
Wood panel fencing â sometimes called stockade fencing â improves privacy and security and is a good choice for setting boundaries for children and pets. Individual components â boards and rails â and prebuilt panels come in sections 4 to 6 feet tall and 6 or 8 feet long. There are two basic types of panels: 1  The boards on a solid panel fence butt against each other. 2  Shadowbox panels, right, use alternating boards on each side of the fence rail to give the fence the same look on both sides, allow air circulation and provide partial views.
Different Kinds of Fences. When it comes to fencing there are hundreds of different kinds of fences made of different types of materials that serve specific purposes. When you factor in all the different styles of fences and functions as well there are truly limitless amounts of fencing options available. Wire Fences â Wire fencing comes in all kinds of varieties. 2  Electric fences are wire fences. 3  So are barbed wire fences, woven wire fences, chicken wire fences, and welded wire mesh fences. 4  Wire fences are often used for agricultural purposes to protect livestock, to keep pets in, and to keep predators out.