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.
black, metacinnabar (Î²-HgS), is less common in nature and adopts the zinc blende (T 2 d-F 4 3m) crystal structure. Crystals of red, Î±-HgS, are optically active. This is caused by the Hg-S helices in the structure. Preparation and chemistry. Î²-HgS is precipitated as a black powder when H 2 S is bubbled through solutions of Hg(II) salts. Î²-HgS is unreactive to all but concentrated acids. Mercury metal is produced from the cinnabar ore by roasting in air and condensing the vapour. Uses. When Î±-HgS is used as a red pigment, it is known as vermilion.