Halobacteria
Note: The word "halobacteria" is also the plural form of the word "
halobacterium". Halobacteria are more correctly called
Haloarchaea, but halobacteria remains in common usage as they were originally designated as such before the existence of the domain
Archaea was realised. In
taxonomy, the Halobacteria (also Halomebacteria) are a
class of the
Euryarchaeota, found in water saturated or nearly saturated with salt. They are also called
halophiles, though this name is also used for other organisms which live in somewhat less concentrated salt water. They are common in most environments where large amounts of salt, moisture, and organic material are available. Large blooms appear reddish, from the pigment
bacteriorhodopsin. This pigment is used to absorb light, which provides energy to create
ATP. Halobacteria also possess a second pigment,
halorhodopsin, which pumps in chloride ions in response to photons, creating a voltage gradient and assisting in the production of energy from light. The process is unrelated to other forms of
photosynthesis involving electron transport; however, and halobacteria are incapable of
fixing carbon from
carbon dioxide.
See more at Wikipedia.org...
Halobacteria
Halobakterien
Die Halobakterien sind eine Gruppe einzelliger
Mikroorganismen aus der Gruppe der
Archaeen. Das besondere Kennzeichen dieser Gruppe ist ihre Vorliebe für extrem salzhaltige Umgebungen (
extreme Halophilie). Halobakterien vertragen nicht nur Salzkonzentrationen bis hin zur Sättigung, sie benötigen, um zu wachsen, eine minimale Salzkonzentration von rund 1,5
M NaCl (entspricht ca. 9 %). Halobakterien kommen zum Beispiel in natürlichen
Salzseeen oder in künstlich angelegten
Salinen zur Gewinnung von Meeressalz vor. Halobakterien sind stets
gram-negativ, vermehren sich durch Zellteilung und bilden keine Sporen. Die meisten Halobakterien haben keine Eigenbewegung, einige Stämme bewegen sich jedoch mittels an den Zellenden befindlichen Geißeln.
Mehr unter Wikipedia.org...
Halobacteria
Halobacterie
Free Download Now!
