If it is positive, then you may have a hepatitis B infection. This test may have to be repeated to confirm whether you have a chronic infection. 2. Hepatitis B surface Antibody (HBsAb or anti-HBs) - this tests for the surface antibody that your immune system makes to fight off the virus.
Rottenstone definition, a friable stone resulting from the decomposition of a siliceous limestone, used as a powder for polishing metals. See more. Dictionary.com
The unpleasant odor of rotten eggs and sewage is from hydrogen sulfide; the odor given off by burning matches is sulfur dioxide. Sulfur in the soil is generally in a sulfate form, and microbes change it to sulfide compounds that enter the soil solution and can be taken up by plant roots for growth.