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.
Planning & Design. A fence can provide several things: privacy, a weather barrier, containment for children or pets, protection from intruders, or merely decoration. Deciding which is most important to you will lead you to what type of fence you should build.he best way to start is to look at other fences in your area, and to look through books and home magazines. There are many different types of fences: chain-link, panel, picket, ranch style, etc. And most of the installation techniques are very similar.