A qualitative assay for it trioxide is known as the Marsh test, which utilizes sulfuric acid and the oxidation of zinc.
In 2008, Kulp, et al. discovered bacteria using a compound of this element as an electron donor in photosynthesis. Unlike those of silicon, gallium semiconductors doped with this element exhibit direct bandgap and can be used in laser diodes to directly convert electricity into light. It is also a notable component of Fowler's solution. The pentavalent oxide of this element can replace inorganic phosphorus in glycolysis, allowing glycolysis to proceed, but preventing ATP generation by uncoupling glycolysis. A qualitative assay for it trioxide is known as the Marsh test, which utilizes sulfuric acid and the oxidation of zinc. Also notably used in neosalversan, for 10 points, name this toxic metalloid with the symbol As.
In 2008, Kulp, et al. discovered bacteria using a compound of this element as an electron donor in photosynthesis.
 arsenic