Protein-bound iron-sulfur ([Fe-S]) clusters, which are polynuclear combinations of iron and sulfur atoms, are among the most structurally and functionally versatile cofactors in biology 1. [Fe-S ...

It is made of only one type of atom: iron atoms. Sulfur is another element. It contains only sulfur atoms, and nothing else, so it is pure. When we mix two different pure substances together ...

The iron filings are attracted to the magnet, but the sand is not. A mixture of iron filings and sulfur powder could be separated in exactly the same way. A beaker containing a mixture of ...