Bakteeriyada guduudan waa koox ka mid ah bakteeriyada photosynthetic oo ka tirsan phylum Proteobacteria. Waxaa loogu yeeraa bakteeriyada guduudan sababtoo ah midabkooda midabka guduudan, taas oo ay keento midabada nuugaya iftiinka ee loo yaqaan bacteriochlorophylls. Bakteeriyada Purple waa anaerobic ama facultatively anaerobic, taasoo la micno ah inay samayn karaan photosynthesis marka ay jirto ama maqnaanshaha ogsijiinta. Waxay isticmaalaan nooc gaar ah oo photosynthesis ah oo loo yaqaan anoxygenic photosynthesis, kaas oo aan soo saarin ogsijiinta sida wax soo saarka. Taa baddalkeeda, waxay isticmaalaan tamarta iftiinka si ay u dhaliyaan ATP (adenosine triphosphate) hababka gacanta waxayna yareeyaan kaarboon dioxide si ay u noqdaan xeryahooda organic. . Waxaa lagu yaqaanaa inay sameeyaan noocyada kala duwan ee falcelinta sawir-qaadista, oo ay ku jiraan sawirofosforyaal aan wareeg ahayn iyo kuwa aan wareeg ahayn. Qaar ka mid ah noocyada bakteeriyada guduudan ayaa sidoo kale awood u leh inay hagaajiyaan nitrogen, u beddelaan nitrogen atmospheric ammonia, taas oo ay isticmaali karaan noolaha kale. ee walxaha organic. Waxay sidoo kale xiiseynayaan cilmi-baarista sayniska sababtoo ah hababka sawir-qaadista ee gaarka ah iyo codsiyada suurtagalka ah ee cilmiga bayoolajiga iyo wax soo saarka bioenergy.