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  • 1
    Electronic Resource
    Electronic Resource
    Bacteriorhodopsin in a bloom of halobacteria in the Dead Sea (1981)
    Springer
    Archives of microbiology 130 (1981), S. 185-187 
    Details
    ISSN: 1432-072X
    Keywords: Bacteriorhodopsin ; Halobacterium ; Dead Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A dense bloom of red halobacteria developed in the Dead Sea in the summer 1980, bacterial densities of up to 1.9 x107 cells ml-1 were observed. The population consisted of two types: pleomorphic, cup-shaped cells and rod-shaped cells. A high content of bacteriorhodopsin was found in the bloom (up to 0.4 nmol per mg protein). The rod-shaped Halobacterium was isolated and was shown to contain bacteriorhodopsin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411075
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the red coloration of saltern crystallizer ponds. II. Additional evidence for the contribution of halobacterial pigments (1994)
    Springer
    International journal of salt lake research 3 (1994), S. 9-13 
    Details
    ISSN: 1573-8590
    Keywords: solar salterns ; Halobacterium ; Dunaliella ; bacterioruberin ; β-carotene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract In a previous paper we attempted to assess the contribution of red bacteria of theHalobacterium — Haloferax — Haloarcula group and of the β-carotene-rich green algaDunaliella salina to the red colour of saltern crystallizer ponds. By means of light absorption measurements, we showed that bacterioruberin contained in the bacteria was mainly responsible for the colour of the brines, in spite of the fact that β-carotene derived fromDunaliella was the pigment present in the greatest amount. This apparent discrepancy was explained by the very smallin vivo optical cross-section of β-carotene, which is densely packed in globules inside theD. salina cells. We recently observed that the centrifugation technique used in the previous study to collect biomass from the ponds was unsuitable for this type of measurements, as a substantial part of theDunaliella cells present did not sediment upon centrifugation due to the low specific gravity caused by the high β-carotene content. Therefore similar measurements were performed with biomass collected by filtration. Again,in vivo absorption spectra were dominated by the absorption peaks of bacterioruberin. The results reported here show that, in spite of the methodological problem associated with the earlier study, all views and conclusions expressed in our earlier paper retain their validity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990638
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of the halophilic archaeal community in saltern crystallizer ponds by means of polar lipid analysis (1994)
    Springer
    International journal of salt lake research 3 (1994), S. 15-29 
    Details
    ISSN: 1573-8590
    Keywords: solar salterns ; Haloferax ; Haloarcula ; Halobacterium ; square bacteria ; glycolipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract Saltern crystallizer ponds are coloured red due to the presence of dense communities of red halophilic archaea (family Halobacteriaceae). Little quantitative information exists on the species distribution within the archaeal community in such ponds. As the different genera of the Halobacteriaceae differ in polar lipid content, and especially in the types of glycolipids, lipid analysis can be used to obtain information on the nature of the organisms present. Analysis of the polar lipids extracted from the biomass collected from the saltern crystallizer ponds in Eilat, Israel, showed one major glycolipid to be present, co-chromatographing with the sulfated diglycosyl diether lipid characteristic of the genusHaloferax. No indications were found for the presence of significant amounts of those glycolipids that would indicate the presence of large numbers of other archaea such asHalobacterium species (H. cutirubrum andH. salinarium, characterized by sulfated triglycosyl and tetraglycosyl diethers), orHaloarcula species (possessing a triglycosyl diether). Phosphatidyl glycerosulfate, a polar lipid absent inHaloferax species, was present in the lipid extract from the crystallizer ponds, suggesting that the dominant microorganism present may be related to strains which are presently classified in the genusHalobacterium but are awaiting a taxonomic reappraisal (H. sodomense, H. saccharovorum, andH. trapanicum). Organisms of the latter group are characterized by sulfated diglycosyl diethers, and the presence of phosphatidyl glycerosulfate. Attempts to isolate the dominant type of bacterium on agar plates yielded relatively low counts (1–2 orders of magnitude lower than the numbers observed microscopically) of bacteria, and most of the isolates had a polar lipid composition characteristic of theH. salinarium group or theH. sodomense-H. saccharovorum-H. trapanicum group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990639
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    Paper (German National Licenses)
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