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.
An electric fence is a barrier that uses electric shocks to deter animals or people from crossing a boundary. Wall top: Wall-top electric fences attach to the top of an existing perimeter barrier such as a masonry wall. 2  These are the second most common type of security electric fences. 3  The existing fence must be at least 1.5 m high.