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.
Building A Post-and-Rail Fence. The simplest wood fences are post-and-rail fences, of which there are three basic types distinguished by the shape and design of their posts. The fence and the way you install it depends on whether the posts are square, round, or pre-mortised.Set square posts in the ground, trim them to height and install rails.uilding A Post-and-Rail Fence. The simplest wood fences are post-and-rail fences, of which there are three basic types distinguished by the shape and design of their posts. The fence and the way you install it depends on whether the posts are square, round, or pre-mortised.