1 You have signs of infection, such as: 2  Increased pain, swelling, warmth, or redness around the bite. 3  Red streaks leading from the bite. 4  Pus draining from the bite.  A fever.
A negative index of refraction due to three-dimensional chirality is demonstrated for abilayered metamaterial based on pairs of mutually twisted planar metal patterns in parallel planes, which alsoshows negative electric and magnetic responses and exceptionally strong optical activity and circular dichro-ism.
The refractive index generally increases with the density of the medium: it is one for a vacuum and is greater than one for all known natural materials. Ad. Air typically has a refractive index of about 1.00029, but this varies with temperature and pressure.