This MedLibrary.org supplementary page on Green sulfur bacteria is provided directly from the open source Wikipedia as a service to our readers. Please see the note below on authorship of this content, as well as the Wikipedia usage guidelines. To search for other content from our encyclopedia supplement, please use the form below:
Related Sponsors
| Green sulfur bacteria | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Scientific classification | ||||||||||
|
||||||||||
| Genera | ||||||||||
|
Chlorobium |
The green sulfur bacteria are a family of obligately anaerobic photoautotrophic bacteria. Most closely related to the nonetheless distant Bacteroidetes, they are accordingly assigned their own phylum.[1]
Green sulfur bacteria are non-motile (except Chloroherpeton thalassium, which may glide)[1] and come in spheres, rods, and spirals.citation needed Photosynthesis is achieved using bacteriochlorophyll (BChl) c, d, or e, in addition to BChl a and chlorophyll a,[1] in chlorosomes attached to the membrane.citation needed They use sulfide ions, hydrogen or ferrous iron as an electron donor and the process is mediated by the type I reaction centre and Fenna-Matthews-Olson complex. Elemental sulfur deposited outside the cell may be further oxidized. By contrast, the photosynthesis in plants uses water as electron donor and produces oxygen.[1]
Chlorobium tepidum has emerged as a model organism for the group, and although only ten genomes have been sequenced, these are quite comprehensive of the family's biodiversity. Their 2-3 Mb genomes encode 1750-2800 genes, 1400-1500 of which are common to all strains. The apparent absence of two-component histidine-kinases and response regulators suggest limited phenotypic plasticity. Their small dependence on organic molecule transporters and transcription factors also indicate that these organisms are adapted to a narrow range of energy-limited conditions, an ecology shared with the simpler cyanobacteria, Prochlorococcus and Synechococcus[1]
A species of green sulfur bacteria has been found living near a black smoker off the coast of Mexico at a depth of 2,500 meters beneath the surface of the Pacific Ocean. At this depth, the bacterium, designated GSB1, lives off the dim glow of the thermal vent since no sunlight can penetrate to that depth.[2]
Contents |
See also
Notes, links and References
External links
- "The Family Chlorobiaceae". The Prokaryotes. Retrieved on July 5, 2005.
References
 |
This A couple of books, even specialty encyclopedia's should be listed here needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (July 2008) |
Footnotes
- ^ a b c d e D.A. Bryant & N.-U. Frigaard (Nov 2006). "Prokaryotic photosynthesis and phototrophy illuminated". Trends Microbiol. 14 (11): 488. doi:.
- ^ Beatty JT, Overmann J, Lince MT, Manske AK, Lang AS, Blankenship RE, Van Dover CL, Martinson TA, Plumley FG. (2005). "An obligately photosynthetic bacterial anaerobe from a deep-sea hydrothermal vent". Proc. Natl Acad. Sci. USA 102 (26): 9306–10. doi:. PMID 15967984.
 |
This article or section includes a list of references or external links, but its sources remain unclear because it lacks inline citations. You can improve this article by introducing more precise citations where appropriate. (July 2008) |
|
|
This article or section relies largely or entirely upon a single source. Please help improve this article by introducing appropriate citations of additional sources. (July 2008) |
Wikipedia content modification information:
- This page was last modified on 15 August 2008, at 21:41.
Wikipedia Authorship and Review
Wikipedia content provided here is not reviewed directly by MedLibrary.org. Wikipedia content is authored by an open community of volunteers and is not produced by or in any way affiliated with MedLibrary.org.
Wikipedia Usage Guidelines
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article on "Green sulfur bacteria".
The URL for this specific entry is:
All Wikipedia text is available under the terms of the GNU Free Documentation License. (See Copyrights for details). Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.