NDLI: Halobacteria: the evidence for longevity

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Halobacteria: the evidence for longevity

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Extremophiles : Volume 2, Issue 2, May 1998

Extremophiles : Volume 2, Issue 1, February 1998

Extremophiles : Volume 1

Halobacteria: the evidence for longevity

Content Provider	Springer Nature Link
Author	Grant, W. D. Gemmell, Renia T. McGenity, Terry J.
Copyright Year	1998
Abstract	Subterranean salt deposits are the remains of ancient hypersaline waters that presumably supported dense populations of halophilic microorganisms including representatives of the haloarchaea (halobacteria). Ancient subterranean salt deposits (evaporites) are common throughout the world, and the majority sampled to date appear to support diverse populations of halobacteria. The inaccessibility of deep subsurface deposits, and the special requirements of these organisms for survival, make contamination by halobacteria from surface sites unlikely. It is conceivable that these subterranean halobacteria are autochthonous, presumably relict populations derived from ancient hypersaline seas that have been revived from a state of dormancy. One would predict that halobacteria that have been insulated and isolated inside ancient evaporites would be different from comparable bacteria from surface environments, and that it might be possible to use a molecular chronometer to establish if the evolutionary position of the subsurface isolates correlated with the geological age of the evaporite. Extensive comparisons have been made between the 16S rRNA genes of surface and subsurface halobacteria without showing any conclusive differences between the two groups. A further phylogenetic comparison exploits an unusual feature of one particular group of halobacteria that possess at least two heterogeneous copies of the 16S rRNA gene, the sequences of which may have been converging or diverging over geological time. However, results to date have yet to show any gene sequence differences between surface and evaporite-derived halobacteria that might arguably be an indication of long-term dormancy.
Starting Page	279
Ending Page	287
Page Count	9
File Format	PDF
ISSN	14310651
Journal	Extremophiles
Volume Number	2
Issue Number	3
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-08-20
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Medicine Microbiology

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Halocins: are they involved in the competition between halobacteria in saltern ponds?

Isolation of a chymotrypsinogen B-like enzyme from the archaeon Natronomonas pharaonis and other halobacteria

Polymerase chain reaction-based screening method applicable universally to environmental haloarchaea and halobacteria for identifying polyhydroxyalkanoate producers among them

Diversity of Haloquadratum and other haloarchaea in three, geographically distant, Australian saltern crystallizer ponds

Structure of the intracellular part of the motility apparatus of halobacteria

The response of halobacteria to single light stimuli: a theoretical analysis

Molecular Evidence for a Fe-Hydrogenase in the Green Alga Scenedesmus obliquus

Oscillating signals in the sensory pathway of halobacteria induced by periodic light stimuli

Halobacteria: the evidence for longevity

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