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.
Wooden Posts. Wooden posts are the most common type of fence post, ranging from short wooden stakes to split rustic styles to machine-finished round posts with pointed ends. Posts intended for livestock enclosures are generally 4 inches in diameter at a minimum and range from 7 feet to 10 feet or longer.