Index >> Bacterial Photosynthesis >> Chromatiaceae (Formerly Thiorhodaceae ) Purple Sulphur Bacteria

Chromatiaceae (Formerly Thiorhodaceae ) Purple Sulphur Bacteria - The purple sulphur bacteria form globules of elemental sulphur from sulphide inside cells. There is one photocentre. Hydrogen sulphide, sulphur, thiosulpbate or molecular hydrogen are sources of hydrogens.

Organic molecules are utilized in some cases. The principal photosynthesis pigments are bacteriochlorophylls a and b which show absorbtion bands at 375 and 590 nm in the visible region and 800, 850 and 890 in the infrared region for their chlorophylls. A large amount of carotenoids of groups 1, 3 and 4 or tetrahydrospirilloxanthin are present.