It is a so-called rapid fixer, acting more quickly than sodium thiosulfate fixers. They are non-legume nitrogen fixers. Other endosymbiosis with nitrogen fixers in open oceans include Calothrix in Chaetocerous spp. It was felt that the excess honeydew would nourish soil micro-organisms, including nitrogen fixers. They are autotrophs, and are the primary carbon fixers in their environments. This requires mechanisms for nitrogen fixers to protect nitrogenase from oxygen "in vivo". All the nitrogen fixers are haloalkaliphilic in nature as they can grow only at pH-11. Elders and witches often act as trouble fixers. Elders and witches often function as trouble fixers. Ammonium sulfite is used as a preservative for fixers in photography. He had a cameo in the Tenacious D short film "Time Fixers", an iTunes exclusive. Quests are acquired from characters known as Fixers. There are also non-thiosulphate fixers, at least for special purposes. The historian John Gillingham called Coutances "one of the great fixers" of his time. He is also the voice over for E4's Tattoo Fixers.