These two gradients promote the growth of different microorganisms such as Clostridium, Desulfovibrio, Chlorobium, Chromatium, Rhodomicrobium, and Beggiatoa, as well as many other species of bacteria, cyanobacteria, and algae.
Vertebral column | Column | column | Pioneer Column | California Column | Nelson's Column | fifth column | The Durutti Column | Fifth Column (band) | Fifth Column | vertebral column | the Durutti Column | July Column | Berlin Victory Column | Asen's Column | "''The Alexander Column in scaffolds''" (1832-1834), by Grigory Gagarin | Teeling Column | Sixth Column | Shown above as a result of a 7 week period where the columns have been allowed to grow algae, cyanobacteria and other bacterial colonies. Of specific interest are the red regions of the middle column, indicative of purple non-sulfur bacteria (e.g. ''Rhodospirillaceae | Sergei Winogradsky | Rostral column | rostral column | Nelson's Column, Montreal | Nelson's column | Eruption column | Durruti Column | Duke of York Column | Column wave | Column of Justinian | column (newspaper) |