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.
The most common woods used to build fences include cypress, pine, spruce, cedar and redwood. Once you have determined the site, dimensions and perimeter of your fence, it's time to pick out the materials needed for construction.Wood is often chosen over vinyl or aluminum because of its aesthetic value.ine, Fir or Spruce. Pine, fir and spruce are common choices for wood fences because of their affordability and durability. Spruce is commonly used to create prefabricated, stockade-style or picket fences. Pine and fir fall under the category of pressure-treated woods.