Acid rain, containing sulfur emitted by industry ... “So negative-charged sulfur ions fix to those positive sites. Such soils require more applied sulfur to get the same response.

“This is different from potassium, which always remains a potassium ion as it passes ... So agricultural soils might contain 200 lb. to 1,000 lb. of mineral sulfur in a 6" acre slice.

But when a fluid containing sulfur is added, gold strongly prefers to bond with three sulfur ions (an ion is an atom or molecule with a net electrical charge) to form a gold-trisulfur complex.

Although metal ions are central to all of biochemistry ... and is required by all living organisms. Although many sulfur-containing biomolecules have been known for decades, only now are ...