Tarnish happens when silver reacts with hydrogen sulfide and other sulfide compounds in the air. This reaction causes a thin layer of silver sulfide to form on the piece, creating a black coating ...

Iron sulfide, a new substance, has been formed because the iron and sulfur atoms are now chemically bonded together. The new substance is called a compound. Other compounds are made from different ...

We were particularly interested in hybrids between a parent compound and moieties that release gasotransmitters. The dithiolethione moiety should enhance the GSH synthesis both by direct action ...