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.
Biggest Mistakes: Here a few of the most common fence construction mistakes we see: 1-Horizontal Stringers: 2Ã4 boards are the most common stringers used in fencing. These boards typically span posts, spaced 8â on center.Because wood at this span will have a tendency to sag, it is important that the strongest orientation of the board is used-in this case the 4â side, not the 2â side.roper construction of fencing really depends on the type of fence being installed. The basic fence types are as follows: 1 -Perimeter Fence-metal, wood or wood and wire. Typically constructed for privacy on back or side yards.