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  • 1
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    Taxonomic analysis of a group of strains of bacteriochlorophyll b-containing purple bacteria of the genus Blastochloris (1998)
    In:  Microbiologiya, 67 (3). pp. 391-398.
    Details
    Publication Date: 2017-03-22
    Description: The phylogenetic and phenotypic structure of a group of bacteriochlorophyll b-containing purple bacteria of the genus Blastochloris was studied to determine the taxonomic status of these bacteria. The group included the type strains of B. viridis and B. sulfoviridis and eight Blastochloris strains isolated from different water bodies. By DNA-DNA hybridization carried out by the optical method, three phylogenetic clusters were identified within the group studied the corresponded to three genospecies related at a DNA homology level of 30-50%. Two of these genospecies were represented by the type strains of B. viridis and B. sulfoviridis and by three new isolates each; the third genospecies included two new isolates, KR-70sv and KR-101sv. Comparative analysis of the fatty acid composition of four strains gave the same clusters as those yielded by DNA hybridization. Morphological and physiological investigation confirmed that strains phylogenetically close to B. viridis and B. sulfoviridis indeed belonged to these species. However, strains KR-70sv and KR-101sv, constituting a separate genospecies, showed no significant phenotypic distinctions from B. sulfoviridis and were assigned to this species. Thus, out of eight new isolates, three were referred to B. viridis and five to B. sulfoviridis. The latter strains are phenotypically similar but phylogenetically divergent.
    Type: Article , NonPeerReviewed
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    OceanRep: Article in a Scientific Journal - without review
  • 2
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    Differentiation of Ectothiorhodospiraceae based on their fatty acid composition (1996)
    Elsevier
    In:  Systematic and Applied Microbiology, 19 (2). pp. 223-230.
    Details
    Publication Date: 2019-01-24
    Description: The fatty acid composition of 27 strains from 7 described Ectothiorhodospira species, including all type strains, were analyzed and compared using the “Microbial Identification System”. According to their ability to grow in media with 15% total salts and more or to require much lower salt concentrations the comparison of the strains was made in two different groups. The strains grown in the established standard medium for Ectothiorhodospira species at 15% and 25% (w/v) salinity formed four major clusters. Two of these enclosed strains of E. halophila, the others E. abdelmalekii (one strain) and E. halochloris (3 strains), respectively. Those strains with salt optima significantly below 10% (w/v) salinity formed three major clusters. The first included strains of E. mobilis and E. marismortui. The second cluster contained strains of E. shaposhnikovii, E. vacuolata and one strain that had been tentatively identified as E. mobilis but should be considered as a strain of E. shaposhnikovii. The third group contained strains that were assigned to E. mobilis but should be regarded as a separate and new species. The observed similarities support and extend patterns of relationships obtained by other taxonomic investigations on the basis of a smaller number of strains.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0723-2020(96)80048-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Comparative study of the fatty acid composition of some groups of purple nonsulfur bacteria (2007)
    Pleiades Publishing
    In:  Microbiology, 76 (5). pp. 541-551.
    Details
    Publication Date: 2019-09-24
    Description: The fatty acid composition (FAC) of 43 strains of purple nonsulfur bacteria belonging to six genera—Rubrivivax, Rhodopseudomonas, Rhodoplanes, Blastochloris, Rhodobium, and Rhodomicrobium—was studied by capillary gas chromatography. The cultures were grown on standard medium under standard conditions. Automatic identification of the fatty acid methyl esters and statistical processing of the results were performed by the computerized Microbial Identification System (MIS). Significant differences between the FACs of different genera, species, and, sometimes, strains were revealed. 16S rRNA genes of some of the new isolates, primarily those having a specific FAC, were sequenced. The taxonomic status of a number of the strains in question was determined using the FAC characteristics as one of the criteria. It was shown that the FAC characteristics may be used both for affiliating isolates to known species and for revealing new taxa.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1134/S0026261707050050
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    MAVEN insights into oxygen pickup ions at Mars (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-11-06
    Description: Since Mars Atmosphere and Volatile EvolutioN (MAVEN)'s arrival at Mars on 21 September 2014, the SEP (Solar Energetic Particle) instrument on board the MAVEN spacecraft has been detecting oxygen pickup ions with energies of a few tens of keV up to ~200 keV. These ions are created in the distant upstream part of the hot atomic oxygen exosphere of Mars, via photoionization, charge exchange with solar wind protons, and electron impact. Once ionized, atomic oxygen ions are picked up by the solar wind and accelerated downstream, reaching energies high enough for SEP to detect them. We model the flux of oxygen pickup ions observed by MAVEN SEP in the undisturbed upstream solar wind and compare our results with SEP's measurements. Model-data comparisons of SEP fluxes confirm that pickup oxygen associated with the Martian exospheric hot oxygen is indeed responsible for the MAVEN SEP observations.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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