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.
Yes, the refractive index (RI) of a liquid often is different at different temperatures (usually negative; e.g. RI goes down as temperature goes up), although typically the effect is very small. For example, water changes less than 0.01% per degree Celsius.