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.
All optical constants (conductivity, index of refraction, permeability, permittivity, etc) MUST be complex in the Fourier domain since causality requires they be Hilbert transform pairs. If the real or imaginary part is zero, the other one must be zero too.