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  • 1
    Electronic Resource
    Electronic Resource
    Influence of salt concentration and temperature on the fatty acid compositions of Ectothiorhodospira and other halophilic phototrophic purple bacteria (1991)
    Springer
    Archives of microbiology 156 (1991), S. 370-375 
    Details
    ISSN: 1432-072X
    Keywords: Phototrophic purple bacteria ; Ectothiorhodospira ; Fatty acid composition ; Salt adaptation ; Membrane fluidity ; Bilayer stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Influences of the salt concentration on the fatty acid composition of Ectothiorhodospira species and other phototrophic purple bacteria have been analysed. Major fatty acids in bacteria of the genera Rhodobacter, Rhodopseudomonas, Chromatium, and Ectothiorhodospira were straight chain saturated and monounsaturated C-16 and C-18 fatty acids. Salt-dependent responses of all investigated bacteria revealed relations to their salt optima. Minimum values of C-16 and saturated fatty acids and maximum values of C-18 and unsaturated fatty acids were found at or close to the salt optima. Responses of Ectothiorhodospira mobilis upon changes in salinity were nearly identical, whether cells were grown in batch culture or in continuous culture with identical dilution rates at all salt concentrations. With increasing temperature, the fatty acid composition of Ectothiorhodospira mobilis and Ectothiorhodospira halophila strains showed decreasing portions of C-18 and of unsaturated fatty acids, while the contents of C-16 and saturated fatty acids increased. The results are discussed with respect to bilayer stabilisation and membrane fluidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248713
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of salt on the lipid composition of Ectothiorhodospira (1991)
    Springer
    Archives of microbiology 156 (1991), S. 376-384 
    Details
    ISSN: 1432-072X
    Keywords: Ectothiorhodospira ; Phospholipids ; Salt adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Major components of polar lipids of halophilic phototrophic Ectothiorhodospira species were PG, CL, PC and PE. PA was only present in minor amounts. According to 14C-incorporation, polar lipids approximated to 75%–93% of the total lipid carbon. With increasing salinity, a strong increase in the portion of PG and a decrease in that of PE (especially in Ectothiorhodospira mobilis BN 9903) and CL (especially in E. halophila strains) were observed. Moreover, there was a significant increase in the excess negative charges of phospholipids upon increasing medium salinity. This increase was most dramatic in the slightly halophilic E. mobilis BN 9903, but quantitatively less important in both strains of E. halophila which had, however, a higher percentage of negative charges of their lipids. During salt-shift experiments, E. halophila BN 9630 responded to suddenly increased salinity by promoting the biosynthesis of PG and decreasing that of PC, CL and PE. Upon dilution stress, responses were reversed and resulted in a strong increase in PE biosynthesis. The effects of lipid charges and bilayer forming forces in stabilizing the membranes of Ectothiorhodospira species during salt stress are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248714
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    Paper (German National Licenses)
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  • 3
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    Chemical composition of the lipopolysaccharides of Ectothiorhodospira shaposhnikovii, Ectothiorhodospira mobilis, and Ectothiorhodospira halophila (1992)
    Springer
    In:  Archives of Microbiology, 157 (6). pp. 499-504.
    Details
    Publication Date: 2016-01-22
    Description: Lipopolysaccharides were isolated from the moderate halophilic Ectothiorhodospira shaposhnikovii slight to and Ectothiorhodospira mobilis and from the extremely halophilic Ectothiorhodospira halophila by the hot phenol-water and purified by the phenol-chloroform-petroleum ether methods. The isolated lipopolysaccharides of all three species contained 3-deoxy-d-manno-octulosonic acid and d-glycero-d-mannoheptose indicating the existence of a core. They contained additionally glucose and uronic acids (E. shaposhnikovii and E. mobilis) or glucose, uronic acids and threonine (E. halophila). Sodium deoxycholate gel-electrophoresis of the three lipopolysaccharides, each showing only one major band, indicated R-type character of the lipopolysaccharides of the three Ectothiorhodospira species. The lipid A fractions of the lipopolysaccharides from E. shaposhnikovii and E. mobilis represented phosphorylated “mixed” lipid A types with both 2,3-diamino-2,3-dideoxy-d-glucose and d-glucosamine. The lipid A from E. halophila contained also phosphate and 2,3-diamino-2,3-dideoxy-d-glucose but only traces of d-glucosamine, which would indicated lipid ADAG. The fatty acid spectra were characterized by amide-bound 3-OH-10:0 and 3-OH-12:0 (E. shaposhnikovii), 3-OH-10:0 (E. mobilis), or 3-OH-10:0,3-OH-14:0, and 3-oxo-14-0 (E. halophila). The predominant ester-bound fatty acids were 14:0 and 16:0 (E. shaposhnikovii and E. mobilis), or 12:0 and 14:1 (E. halophila).
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/BF00276769
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    The anoxygenic phototrophic purple bacteria (2001)
    Springer
    In:  In: Bergey's Manual of Systematic Bacteriology. , ed. by Boone, D. R. and Castenholz, R. W. Springer, New York, pp. 631-637. 2
    Details
    Publication Date: 2012-02-28
    Type: Book chapter , PeerReviewed
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  • 5
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    Dihydroxylycopene diglucoside diesters: a novel class of carotenoids from the phototrophic purple sulfur bacteria Halorhodospira abdelmalekii and Halorhodospira halochloris (2001)
    Springer
    In:  Archives of Microbiology, 175 (3). pp. 161-167.
    Details
    Publication Date: 2016-05-26
    Description: The carotenoids in Halorhodospira abdelmalekii and Halorhodospira halochloris were analyzed by spectroscopic methods. The carotenoid composition of the two species was almost the same. Both species contained substantial amounts of unusual carotenoid glycoside fatty acid esters, which have been found for the first time in phototrophic purple bacteria. Methoxy-hydroxylycopene glucoside was a major component, and dihydroxylycopene diglucoside and dihydroxylycopene diglucoside diester were also found. Lycopene, rhodopin, and 3,4,3′,4′-tetrahydrospirilloxanthin were present in very small amounts. Methoxy, glucosyl, and glucosyl ester groups were observed as substituents at the positions of the two original hydroxyl groups of dihydroxylycopene and made up approximately 20, 50, and 20%, respectively, of the total end groups (100%). The fatty acid components of the three carotenoid glucoside esters were the same (C12:0 and C14:1) and were rare in the cellular lipids of the two species
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s002030000247
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    True marine and halophilic anoxygenic phototrophic bacteria (2001)
    Springer
    In:  Archives of Microbiology, 176 . pp. 243-254.
    Details
    Publication Date: 2016-05-26
    Description: Anoxygenic phototrophic bacteria are widely distributed in marine sediments and shallow waters of the coastal zone, where they often form intensely colored mass developments. The phototrophic bacteria have adapted to the whole spectrum of salt concentrations, from freshwater to saturated brines, and it is apparent that individual species have adapted well to particular habitats and mineral salts compositions, both qualitatively and quantitatively. This adaptation is reflected not only in the demand for defined ranges of salt concentrations, but also in the phylogenetic relationships of these bacteria, as established by 16S rDNA sequences. Major phylogenetic branches of purple sulfur bacteria are represented by: (1) marine and extremely halophilic Ectothiorhodospiraceae, (2) truly marine and halophilic Chromatiaceae and (3) freshwater Chromatiaceae, some of which are tolerant to low salt concentrations and are successful competitors in brackish and marine habitats. Quite similarly, salt-dependent green sulfur bacteria form distinct phylogenetic lines. In addition, also among the phototrophic α-Proteobacteria (purple nonsulfur bacteria), distinct phylogenetic lines of salt-dependent species are recognized. Available data give rise to the assumption that salt concentrations of natural habitats are an important selective factor that determines the development of a selected range of phototrophic bacteria in an exclusive way. As a consequence, the salt responses of these bacteria are reflected in their phylogenetic relationships
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s002030100326
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Phylogenetic diversity of numerically important Arctic sea ice baceria cultured at subzero temperature (2002)
    Springer
    In:  Microbial Ecology, 43 (3). pp. 315-328.
    Details
    Publication Date: 2017-03-22
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00248-001-1026-4
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    The phototrophic alpha-Proteobacteria (2001)
    Springer
    In:  In: The Prokaryotes: An evolving electronic resource for the microbial community. , ed. by Dworkin, M., Falkow, S., Rosenberg, E., Schleifer, K. H. and Stackebrandt, E. Springer, New York. 3
    Details
    Publication Date: 2012-02-28
    Type: Book chapter , PeerReviewed
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  • 9
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    Sponge-Associated Bacteria: General Overview and Special Aspects of Bacteria Associated with Halichondria panicea (2003)
    Springer
    In:  In: Sponges (Porifera). , ed. by Müller, W. E. G. Springer, Berlin, pp. 35-57.
    Details
    Publication Date: 2018-08-03
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 10
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    The phototrophic beta-Proteobacteria (2001)
    Springer
    In:  In: The Prokaryotes: An evolving electronic resource for the microbiological community. , ed. by Dworkin, M., Falkow, S., Rosenberg, E., Schleifer, K. H. and Stackebrandt, E. Springer, New York. 3
    Details
    Publication Date: 2012-02-28
    Type: Book chapter , PeerReviewed
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    OceanRep: Book chapter
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