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.
Acoustic fencing, to reduce noise pollution. Privacy fencing, to provide privacy and security. Temporary fencing, to provide safety, security, and to direct movement; wherever temporary access control is required, especially on building and construction sites. Perimeter fencing, to prevent trespassing or theft and/or to keep children and pets from wandering away.
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.