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Topic: Thiomargarita namibiensis

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	WHOI : Media Relations : News Release : Giant Sulfur Bacteria Discovered off African Coast
		The largest bacterium ever found, a harmless organism that grows as a string of white beads large enough to be visible to the naked eye, has been found in coastal sediments off the coast of Namibia by an international research team.
		Genetic sequencing indicates Thiomargarita, collected during a 1997 cruise aboard the Russian research vessel Petr Kottsov, is closely related to the marine species of the filamentous sulphur bacteria, Thioplocaand Beggiatoa.
		Thiomargarita is physiologically adapted to its highly dynamic environment with frequent fluctuations of the chemicals needed for food and respiration.
	www.whoi.edu /mr/pr.do?id=998 (598 words)

	The Largest Bacterium: Scientist Discovers New Bacterial Life Form Off The African Coast
		The spherical cells of Thiomargarita namibiensis are generally 0.1 - 0.3 millimeter wide but some reach up to a size of 3/4 of a millimeter.
		Thiomargarita namibiensis has its ecological niche in the oxygen-poor but nutrient-rich sediment and can survive in this environment which is toxic for most animal life due to high levels of hydrogen sulfide.
		Thiomargarita is a close relative of these bacteria, but unlike their smaller cousins they are unable to and do not need to move constantly up and down to get nitrate or sulfide.
	www.eurekalert.org /pub_releases/1999-04/M-TLBS-160499.php (845 words)

	Planet Ark (Site not responding. Last check: 2007-10-07)
		Named Thiomargarita namibiensis, or "Sulfur pearl of Namibia", it thrives on sulphur and lives in smelly mud just off the coast of Namibia in southern Africa.
		Thiomargarita namibiensis lives on nitrogen and sulfide chemicals produced on the seafloor by rotting algae and plankton.
		The odd way in which Thiomargarita namibiensis is able to use sulphur and nitrogen makes the scientists think such systems might be more important than was previously thought.
	www.planetark.com /avantgo/dailynewsstory.cfm?newsid=353 (437 words)

	Thiomargarita namibiensis
		Thiomargarita namibiensis is a bacterium that was first described in 1999; it is the only known member of its genus.
		It is a sulphur bacterium found on the continental shelf off the coast of Namibia.
		The text of this article is licensed under the GFDL.
	www.ebroadcast.com.au /lookup/encyclopedia/th/Thiomargarita.html (83 words)

	Biggest Bacteria Ever Found
		The researchers named the new bacteria Thiomargarita namibiensis, which means "Sulfur Pearl of Namibia." The microbes store elemental sulfur just under the cell wall as well as nitrate in a huge central sac, which shines with an opalesque, blue-green whiteness.
		Both Thioploca and Thiomargarita, which are close genetic cousins, face the same ecological challenge: how to oxidize ("eat") sulfide with the help of nitrate.
		Thiomargarita microbes, on the other hand, don't form filaments and are not mobile.
	www.eurekalert.org /pub_releases/1999-04/AAft-BBEF-160499.php (1115 words)

	Science News Online (4/17/99): Pearl-like bacteria are largest ever found
		Residing in the greenish ooze of ocean sediment off the coast of Namibia, the spherical bacteria have diameters ranging from 100 to 750 micrometers.
		namibiensis is so large that smaller bacteria colonize the mucus sheath enveloping the microbe.
		namibiensis' interior consists primarily of sulfur globules dispersed throughout a thin layer of cellular fluid, or cytoplasm, that surrounds the vacuole.
	www.sciencenews.org /sn_arc99/4_17_99/fob5.htm (609 words)

	Thiomargarita namibiensis - TheBestLinks.com - Namibia, 1999, Continental shelf, Classis, ... (Site not responding. Last check: 2007-10-07)
		Thiomargarita namibiensis - TheBestLinks.com - Namibia, 1999, Continental shelf, Classis,...
		Thiomargarita namibiensis, Namibia, 1999, Continental shelf, Classis, Familia...

Thiomargarita namibiensis is the largest bacterium ever discovered, with a diameter of around 0.3 mm, making it easily visible to the naked eye.

www.thebestlinks.com /Thiomargarita_namibiensis.html (132 words)

	Thiomargarita nambiensis
		Washington, DC (4/16/99)- Thiomargarita namibiensis, a giant bacterium discovered off the coast of Namibia, has a repertoire of survival techniques that would be the envy of any extremophile.
		The researchers noted that nitrate concentrations within the cell could be up to 10.000 times higher than in the surrounding sea water This combination of the oxidation of sulfide with the reduction of nitrate provides the bacteria with an energy source which is not accessible for most bacteria in the absence of oxygen.
		While nitrate is found in sea water, it does not penetrate the oxygen-poor, sulfide-rich sediment where these bacteria are found.
	www.accessexcellence.org /WN/SUA12/marg499.html (536 words)

	A Giant Among Bacteria
		The record holder for the biggest bacteria recorded on the earth is now (drum roll please): Thiomargarita namibiensis.
		However, Thiomargarita namibiensis' largest cells have an enormous volume of 0.22 millimeters cubed.
		Not only is Thiomargarita namibiensis a giant but it is also very unusual.
	www.suite101.com /article.cfm/microbiology/19337 (435 words)

	Spirit Mars Anomalies--Again
		Thiomargarita namibiensis, a giant bacterium discovered off the coast of Namibia, has a repertoire of survivaltechniques that would be the envy of any extremophile.
		The massive vacuole allows Thiomargarita to "hold its breath" until the appropriate nutrients become available.
		The genetically similar Thioploca and Thiomargarita, have evolved separate adaptations to the same ecological challenge of surviving in the high sulfide environment.
	www.mars-mania.com /sol613.html (583 words)

	SIGHTINGS (Site not responding. Last check: 2007-10-07)
		But unlike all but a few related types of nitrate-breathing bacteria, Thiomargarita "eats" sulfur, and it has to live down in the sediment to find it.
		Thiomargarita can also store sulfur in the cell area outside the compartment to use as food when none is available.
		"Thiomargarita has to sit there and take whatever nature gives it," says Douglas Nelson, a microbial ecologist at the University of California, Davis.
	www.rense.com /ufo3/bac.htm (344 words)

	American Society of Limnology and Oceanography: Welcome Page (Site not responding. Last check: 2007-10-07)
		The formation of phosphorite in marine sediments is an important long-term sink for the essential nutrient phosphorus.
		Off the coast of Namibia we found sharp peaks of pore water phosphate (more than 300 micromol) and massive phosphorite accumulations (more than 50 g P kg-1) in the same sediment depths where Thiomargarita namibiensis was most abundant.
		Laboratory experiments confirmed that Thiomargarita populations are releasing phosphate with high enough rates to account for the precipitation of hydroxyapatite observed in the environment.
	aslo.org /meetings/slc2005/abstracts/248.htm (219 words)

	Biggest Microbes (Site not responding. Last check: 2007-10-07)
		namibiensis cells (white and clear blobs) next to a fruit fly's head.
		The colossus among bacteria is a single-celled giant that lives in the ocean and is named Thiomargarita namibiensis , which means "sulfur pearl of Namibia." It was found in the ocean floor off the coast of Namibia in Africa.
		namibiensis cell is to an ordinary bacterium what a 75-foot (23-meter) blue whale is to a newborn mouse.
	www.microbe.org /microbes/biggest.asp (1128 words)

	Uptake Rates of Oxygen and Sulfide Measured with Individual Thiomargarita namibiensis Cells by Using Microelectrodes -- ...
		namibiensis cells was placed in a chamber with 250 ml of artificial seawater.
		Oxygen flux (A) and sulfide flux (B) towards an individual Thiomargarita cell with a diameter of 220 µm.
		Numerous measurements showing the same type of response were obtained with cells lying on the bottom of the chamber, but quantification of fluxes from these profiles by using Fick's law may have led to overestimates and were therefore not included in the data set.
	aem.asm.org /cgi/content/full/68/11/5746 (2454 words)

	[No title] (Site not responding. Last check: 2007-10-07)
		Schulz named Thiomargarita namibiensis, or sulfur pearl of Namibia, reach a diameter of up to one-thirtieth of an inch or so, roughly the size of this period.
		They are orders of magnitude larger than most other bacteria, and in volume are up to 70 times bigger than the previous record-holder, a microbe found in the guts of surgeonfish.
		But thiomargarita's odd fondness for sulfide is its saving grace.
	www.nrs.mcgill.ca /microbiology/micr331/Largebacterium.html (753 words)

	BBC News \| Sci/Tech \| A whale of a bug
		The unique ability to store these life-giving chemicals, for up to three months, also allows the bacteria to "hold their breath" when the sediments and waters around them are periodically poor in the nutrients they need.
		The discovery of Thiomargarita namibiensis is reported in the magazine Science.
		The scientists were surprised to find only scant populations of the two bacteria they were looking for.
	news.bbc.co.uk /low/english/sci/tech/newsid_320000/320117.stm (573 words)

	News in Science - Monster microbes found - 16/04/1999
		Their resemblance to a string of pearls inspired the researchers from the Max Planck Institute for Marine Microbiology to name them Thiomargarita namibiensis or "Sulphur Pearl of Namibia".
		The giant bacteria live in oxygen-deprived sediment that is toxic to most animals because of its high levels of hydrogen sulfide formed from dead algae.
		This adaptation is unique in the living world and allows them to use an energy source not available to most bacteria without oxygen.
	www.abc.net.au /science/news/stories/s22180.htm (404 words)

	Giant Bacterium Found In Sea Off Namibia (Site not responding. Last check: 2007-10-07)
		WASHINGTON (Reuters) - A team of international scientists said Thursday it has stumbled on a giant, sulfur-eating bacterium that forms pearl-like strands and that can be seen with the naked eye.
		Named Thiomargarita namibiensis, or ``Sulfur pearl of Namibia'', it thrives on sulfur and lives in smelly mud just off the coast of Namibia in southern Africa.
		The odd way in which Thiomargarita namibiensis is able to use sulfur and nitrogen makes the scientists think such systems might be more important than was previously thought.
	www.anomalous-images.com /news/news410.html (443 words)

	Science NewsBriefs (Site not responding. Last check: 2007-10-07)
		The giant bacterium Thiomargarita namibiensis helps drive one of the Earth's nutrient
		are home to T. namibiensis, were rich in phosphorite.
		namibiensis is a giant compared to other bacteria.) Laboratory studies showed that the
	www.world-science.net /ScienceNewsBriefs/stories/050121_Behemoth.htm (139 words)

	Joye Research Lab \| Research
		During a July 2002 research cruise to the Gulf of Mexico, we discoverd a giant vacuolate sulfur oxidizing bacteria that looked similar to Thiomargarita namibiensis.
		About 800 base pairs of 16S rRNA gene sequence data, linked to this bacterium by fluorescent in situ hybridization, showed 99% identity with Thiomargarita namibiensis, previously described only from sediments collected off the coast of Namibia (Western Africa).
		While T. namibiensis cells form linear chains within a common sheath, the Gulf of Mexico strain occurred as single cells and clusters of 2, 4 and 8 cells, which were clearly the product of division in one to three planes (Kalenetra et al., manuscript submitted to Environmental Microbiology, September 2004)
	alpha.marsci.uga.edu /FacultyPages/Joye/research/cold_seeps2.htm (499 words)

	archive: SETI Eating Sulfur, Breathing Nitrogen
		The red dots indicate where Thiomargarita namibiensis was found in the
		At the center of each Thiomargarita is a sac of nitrate-rich water, which
		A typical chain of Thiomargarita under a microscope.
	seti.sentry.net /archive/public/1999/4-99/00000158.htm (648 words)

	exam2sp2001key
		S and NO Thiomargarita namibiensis needs to turn on the operons containing (1)the genes for sulfide oxidation AND (2) the genes for nitrate reduction.
		Propose a mechanism by which both operons could be turned on in the presence of H
		Refer to the article "Dense Populations of a Giant Sulfur Bacterium in Namibian Shelf Sediments" to answer questions 6 and 7 below.
	www.humboldt.edu /~pls13/sp2001exam2key.html (2324 words)

	Thiomargarita Schulz et al
		J.P. Euzéby: List of Prokaryotic Names with Standing in Nomenclature - Genus Thiomargarita
		Genera and taxa above the rank of genus up to and including class:
		The information on this page may not be reproduced, republished or mirrored on another webpage or website.
	www.bacterio.cict.fr /t/thiomargarita.html (165 words)

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Topic: Thiomargarita namibiensis

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In the News (Sun 19 May 13)