Boron, arsenic, and antimony, among other substances, are used as dopants when added to a pure semiconductor material to alter its electrical characteristics.
Artificially produced gemstones[?] (such as Ruby (gemstone)) usually contain a dopant to identify them as such.
... in the process; it is the light reaction which produces waste oxygen.
The light reaction also generates ATP by powering the addition of a phosphate group to ADP, a ...