Definitions for halobacterium
This page provides all possible meanings and translations of the word halobacterium
halobacteria, halobacterium, halobacter(noun)
halophiles in saline environments such as the Dead Sea or salt flats
Any of various extremophiles, of genus Halobacteria, found in water saturated or nearly saturated with salt.
In taxonomy, Halobacterium is a genus of the Halobacteriaceae. The genus Halobacterium consists of several species of archaea with an aerobic metabolism which require an environment with a high concentration of salt; many of their proteins will not function in low-salt environments. They grow on amino acids in their aerobic conditions. Their cell walls are also quite different from those of bacteria, as ordinary lipoprotein membranes fail in high salt concentrations. In shape, they may be either rods or cocci, and in color, either red or purple. They reproduce using binary fission, and are motile. Halobacterium grows best in a 42 °C environment. The genome of an unspecified Halobacterium species has been sequenced and comprises 2,571,010 bp of DNA compiled into three circular strands: one large chromosome with 2,014,239 bp, and two smaller ones with 191,346 and 365,425 bp. This species, called Halobacterium sp. NRC-1, has been extensively used for post-genomic analysis. Halobacterium species can be found in the Great Salt Lake, the Dead Sea, Lake Magadi, and any other waters with high salt concentration. Purple Halobacterium species owe their color to bacteriorhodopsin, a light-sensitive protein which provides chemical energy for the cell by using sunlight to pump protons out of the cell. The resulting proton gradient across the cell membrane is used to drive the synthesis of the energy carrier ATP. Thus, when these protons flow back in, they are used in the synthesis of ATP. The bacteriorhodopsin protein is chemically very similar to the light-detecting pigment rhodopsin, found in the vertebrate retina.
U.S. National Library of Medicine
A genus of HALOBACTERIACEAE whose growth requires a high concentration of salt. Binary fission is by constriction.
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