Green Sulfur Bacteria

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green sulfur bacteria

[′grēn ¦səl·fər bak′tir·ē·ə]
A physiologic group of green photosynthetic bacteria of the Chloraceae that are capable of using hydrogen sulfide (H2S) and other inorganic electron donors.

Green Sulfur Bacteria


(chlorobacteria), microorganisms of the group of sulfur bacteria that contain chlorophyll and assimilate carbon dioxide by means of solar energy. The bacteria massed together have a saturated green coloration. They carry on photosynthesis in anaerobic conditions without giving off oxygen; hydrogen sulfide is the hydrogen source, but sulfur is not stored in their cells. Green sulfur bacteria contain bacteriochlorophylls, which have maximum absorption of radiation with wavelengths of 450–800 nanometers (this distinguishes green sulfur bacteria from green algae and from purple sulfur bacteria), as well as photosynthetically active carotenoids. All green sulfur bacteria be-long to the family Chlorobacteriaceae. They are represented by the mobile, nonspore-carrying bacillus with a long, polar flagellum—Chlorobium limicola, which forms chains—and Pelodictyon clathratiforme, whose cells typically form a loose net. Green sulfur bacteria live in bodies of fresh and salt water, in which they facilitate the accumulation of organic substances and take part in the sulfur cycle.


References in periodicals archive ?
Lower Kane Cave samples were taken from microbial mats and consisted of epsilon-proteobacteria (67%), gamma-proteobacteria (12%), beta-proteobacteria (12%), delta-proteobacteria (1%), acidobacteria (6%), and bacteroides and chlorobi (2%).
There was a clone that clustered with Paenibacillus durus and had an identical amino acid sequence to an unidentified forest soil bacterium (GenBank accession number AY819600), and 3 clones that clustered with the Clostridium acetobutylicum group, which consisted of published sequences from the 5-proteobacteria, firmicutes, and chlorobi.