Green Sulfur Bacteria

(redirected from Chlorobiales)

green sulfur bacteria

[′grēn ¦səl·fər bak′tir·ē·ə]
(microbiology)
A physiologic group of green photosynthetic bacteria of the Chloraceae that are capable of using hydrogen sulfide (H2S) and other inorganic electron donors.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

A. A. IMSHENETSKII

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.