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.
Electropositive elements tend to lose electrons and form positive ions (e.g. the univalent alkali metals Li+, Na+, K+, etc., and the divalent alkaline-earth metals Be2+, Mg2+, and Ca2+).