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  • 1
    Online Resource
    Online Resource
    Molecular phylogeny of parabasalids inferred from small subunit rRNA sequences, with emphasis on the Hypermastigea
    Elsevier BV ; 2005
    In:  Molecular Phylogenetics and Evolution Vol. 35, No. 3 ( 2005-6), p. 646-655
    Details
    In: Molecular Phylogenetics and Evolution, Elsevier BV, Vol. 35, No. 3 ( 2005-6), p. 646-655
    Type of Medium: Online Resource
    ISSN: 1055-7903
    URL: Article
    DOI: 10.1016/j.ympev.2005.02.013
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2005
    detail.hit.zdb_id: 1471402-4
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Acetogenesis from H 2 plus CO 2 and nitrogen fixation by an endosymbiotic spirochete of a termite-gut cellulolytic protist
    Proceedings of the National Academy of Sciences ; 2015
    In:  Proceedings of the National Academy of Sciences Vol. 112, No. 33 ( 2015-08-18), p. 10224-10230
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 112, No. 33 ( 2015-08-18), p. 10224-10230
    Abstract: Symbiotic associations of cellulolytic eukaryotic protists and diverse bacteria are common in the gut microbial communities of termites. Besides cellulose degradation by the gut protists, reductive acetogenesis from H 2 plus CO 2 and nitrogen fixation by gut bacteria play crucial roles in the host termites’ nutrition by contributing to the energy demand of termites and supplying nitrogen poor in their diet, respectively. Fractionation of these activities and the identification of key genes from the gut community of the wood-feeding termite Hodotermopsis sjoestedti revealed that substantial activities in the gut—nearly 60% of reductive acetogenesis and almost exclusively for nitrogen fixation—were uniquely attributed to the endosymbiotic bacteria of the cellulolytic protist in the genus Eucomonympha . The rod-shaped endosymbionts were surprisingly identified as a spirochete species in the genus Treponema , which usually exhibits a characteristic spiral morphology. The endosymbionts likely use H 2 produced by the protist for these dual functions. Although H 2 is known to inhibit nitrogen fixation in some bacteria, it seemed to rather stimulate this important mutualistic process. In addition, the single-cell genome analyses revealed the endosymbiont's potentials of the utilization of sugars for its energy requirement, and of the biosynthesis of valuable nutrients such as amino acids from the fixed nitrogen. These metabolic interactions are suitable for the dual functions of the endosymbiont and reconcile its substantial contributions in the gut.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.1423979112
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2015
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Endosymbiotic Bacteroidales Bacteria of the Flagellated Protist Pseudotrichonympha grassii in the Gut of the Termite Coptotermes formosanus
    American Society for Microbiology ; 2005
    In:  Applied and Environmental Microbiology Vol. 71, No. 12 ( 2005-12), p. 8811-8817
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 71, No. 12 ( 2005-12), p. 8811-8817
    Abstract: A unique lineage of bacteria belonging to the order Bacteroidales was identified as an intracellular endosymbiont of the protist Pseudotrichonympha grassii ( Parabasalia , Hypermastigea ) in the gut of the termite Coptotermes formosanus . We identified the 16S rRNA, gyrB , elongation factor Tu, and groEL gene sequences in the endosymbiont and detected a very low level of sequence divergence ( 〈 0.9% of the nucleotides) in the endosymbiont population within and among protist cells. The Bacteroidales endosymbiont sequence was affiliated with a cluster comprising only sequences from termite gut bacteria and was not closely related to sequences identified for members of the Bacteroidales attached to the cell surfaces of other gut protists. Transmission electron microscopy showed that there were numerous rod-shaped bacteria in the cytoplasm of the host protist, and we detected the endosymbiont by fluorescence in situ hybridization (FISH) with an oligonucleotide probe specific for the 16S rRNA gene identified. Quantification of the abundance of the Bacteroidales endosymbiont by sequence-specific cleavage of rRNA with RNase H and FISH cell counting revealed, surprisingly, that the endosymbiont accounted for 82% of the total bacterial rRNA and 71% of the total bacterial cells in the gut community. The genetically nearly homogeneous endosymbionts of Pseudotrichonympha were very abundant in the gut symbiotic community of the termite.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.71.12.8811-8817.2005
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2005
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
    Location Call Number Limitation Availability
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