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  • 1
    Electronic Resource
    Electronic Resource
    Thermotoga maritima sp. nov. represents a new genus of unique extremely thermophilic eubacteria growing up to 90°C (1986)
    Springer
    Archives of microbiology 144 (1986), S. 324-333 
    Details
    ISSN: 1432-072X
    Keywords: Evolution ; Eubacteria ; Thermophile ; Anaerobe ; Thermotoga maritima
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A novel type of bacterium has been isolated from various geothermally heated locales on the sea floor. The organisms are strictly anaerobic, rod-shaped, fermentative, extremely thermophilic and grow between 55 and 90°C with an optimum of around 80°C. Cells show a unique sheath-like structure and monotrichous flagellation. By 16S rRNA sequencing they clearly belong to the eubacteria, although no close relationship to any known group could be detected. The majority of their lipids appear to be unique in structure among the eubacteria. Isolate MSB8 is described as Thermotoga maritima, representing the new genus Thermotoga.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409880
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  • 2
    Electronic Resource
    Electronic Resource
    Methanoplanus limicola, a plate-shaped methanogen representing a novel family, the methanoplanaceae (1982)
    Springer
    Archives of microbiology 132 (1982), S. 31-36 
    Details
    ISSN: 1432-072X
    Keywords: Methanogens ; Archaebacteria ; Cell division ; Glycoprotein ; Acetate ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An angular plate-shaped weakly motile mesophilic methanogen was isolated from a swamp of drilling waste in Italy. Growth occurs on H2/CO2 or on formate. Acetate is required in addition. The optimal doubling time is 7 h at 40° C. The cell envelope is composed most likely of glycoprotein subunits in hexagonal arrangement. The GC-content of its DNA is 47.5 mol%. On the basis of DNA-RNA hybridization it was found to represent a new family, the Methanoplanaceae within the order Methanomicrobiales.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690813
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  • 3
    Electronic Resource
    Electronic Resource
    Methanococcus thermolithotrophicus, a novel thermophilic lithotrophic methanogen (1982)
    Springer
    Archives of microbiology 132 (1982), S. 47-50 
    Details
    ISSN: 1432-072X
    Keywords: Methanogens ; Archaebacteria ; Autotrophic ; Thermophilic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An autotrophic thermophilic motile coccoid methanogen was isolated from geothermally heated sea sediments close to Naples, Italy. Growth occurs on H2/CO2 and on formate between 30 and 70°C with an optimum at 65°C. The optimal doubling time is only 55 min. The NaCl-concentration ranges from 1.3% to 8.3% with an optimum around 4%. By its G+C-content of 31.3 mol%, its subunit envelope, and by DNA-RNA hybridization the new isolate is clearly defined to be a member of the genusMethanococcus. We name itMethanococcus thermolithotrophicus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690816
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  • 4
    Electronic Resource
    Electronic Resource
    Pyrite Surface Alteration of Synthetic Single Crystals as Effect of Microbial Activity and Crystallographic Orientation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 20-21 (July 2007), p. 350-353 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To enhance our understanding of effects of microbially mediated pyrite dissolution and theinfluence parameters such as varied metabolism and crystallographic orientation of pyrite surfacessome dissolution experiments were performed. Microbial etching experiments on pyrite surfaces ofdifferent orientation, including {111} and {210} were devised. The experiments were performedusing two strains of thermophilic Archaea (Sulfolobus metallicus, Metallosphaera sedula).Epifluorescence microscopy observations showed that the strains attach to the mineral surface.Studies with Scanning Electron Microscopy (SEM) showed cell attachment and etching effects afterone week of incubation. Surface alteration produced structures following crystallographicorientation up to several 10 μm in size. For all incubated pyrite samples it became apparent thatsurface alteration was more pronounced with M. sedula than with S. metallicus
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.350.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    MvnI: A restriction enzyme in the archaebacterium Methanococcus vannielii (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 52 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The methanogenic archaebacerium Methanococcus vannielii contains a type II restriction endonuclease. The enzyme was purified by a simple three-step procedure resulting in enzyme preparations free of contaminating unspecific nucleases. The restriction enzyme recognizes and cleaves the sequence 5′-CG ↓ CG-3′ (FnuDII and ThaI isoschizomer) and generates DNA fragments with blunt ends. Due to its purity and activity at moderate temperatures, MvnI might be a useful alternative to FnuDII and ThaI active at 60°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02601.x
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  • 6
    Electronic Resource
    Electronic Resource
    Transcription in vitro and in vivo of the 7S RNA gene associated with the ribosomal RNA operon in the hyperthermophilic archaeon Methanothermus fervidus (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 98 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The gene encoding the archaeal 7S RNA in the hyperthermophile Methanothermus fervidus is linked to a tRNASer and rRNA operon in the arrangement 5′-7S RNA-14nt-tRNASer-196nt-16S rRNA and the promoter directing transcription of this 7S RNA gene has now been identified. Initiation of transcription of the 7S RNA gene has been shown to occur both in vivo in M. fervidus and in vitro, using a Methanococcus thermolithotrophicus derived cell-free transcription system, at the first G residue within the initiator sequence ATGG, located 6 bp upstream of the 5′ end of the 7S RNA coding region. Cotranscription of the 7S RNA and tRNASer has been demonstrated in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05496.x
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  • 7
    Electronic Resource
    Electronic Resource
    Archaeal transcription factors and their role in transcription initiation (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 18 (1996), S. 0 
    Details
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract: Archaeal RNA polymerases show a weak ability in vitro to bind to promoter DNA and/or to initiate transcription with low activity independent of upstream regulatory DNA sequences. Active transcription in vitro and in vivo, however, depends strictly on a TATA box resemblin the TATA box of eucaryal polII promoters. This TATA box is recognized by a polypeptide related to eucaryal TATA-binding protein (TBP) that was formerly designated aTFB. Template competition studies showed that this archaeal TATA-binding protein (aTBP) is stably sequestered at the promoter by interaction with the second archaeal transcription factor, aTFA, which is related to eucaryal transcription factor IIB (TFIIB). The association of archaeal TFIIB (aTFIIB) with the aTBP-promoter complex leads to template commitment, indicating that aTFIIB recruits archaeal RNA polymerase to the preinitiation complex. These analyses suggest the following order for assembly of transcription factors on the archaeal promoter: aTBP, aTFIIB, RNA polymerase, and provide evidence for a common molecular mechanism of transcription initiation by eucaryal RNA polymerase II and archaeal RNA polymerases. The sequence of the genes encoding aTBP and aTFIIB (TFB) showed all the characteristics conserved in their eucaryal counterparts. The degree of sequence similarity between archaeal and eucaryal transcription factors is between 27 to 35% for TFIIB and between 36 to 41% for TBP. The findings discussed here indicate that TBP and TFIIB perform analogous functions in Archaea and Eucarya and show that four essential components of archaeal and eucaryal transcriptional machineries, RNA polymerase, TATA box, TBP and TFIIB are homologous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6976.1996.tb00234.x
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  • 8
    Electronic Resource
    Electronic Resource
    TrmB, a sugar sensing regulator of ABC transporter genes in Pyrococcus furiosus exhibits dual promoter specificity and is controlled by different inducers (2005)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 57 (2005), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: TrmB is the transcriptional repressor for the gene cluster of the trehalose/maltose ABC transporter of the hyperthermophilic archaea Thermococcus litoralis and Pyrococcus furiosus (malE or TM operon), with maltose and trehalose acting as inducers. We found that TrmB (the protein is identical in both organisms) also regulated the transcription of genes encoding a separate maltodextrin ABC transporter in P. furiosus (mdxE or MD operon) with maltotriose, longer maltodextrins and sucrose acting as inducers, but not with maltose or trehalose. In vitro transcription of the malE and the mdxE operons was inhibited by TrmB binding to the different operator sequences. Inhibition of the TM operon was released by maltose and trehalose whereas inhibition of the MD operon was released by maltotriose and larger maltodextrins as well as by sucrose. Scanning mutagenesis of the TM operator revealed the role of the palindromic TACTNNNAGTA sequence for TrmB recognition. TrmB exhibits a broad spectrum of sugar-binding specificity, binding maltose, sucrose, maltotriose and trehalose in decreasing order of affinity, half-maximal binding occurring at 20, 60, 250 and 500 µM substrate concentration respectively. Of all substrates, only maltose shows sigmoidal binding characteristics with a Hill coefficient of 2. As measured by molecular sieve chromatography and cross-linking TrmB behaved as dimer in dilute buffer solution at room temperature. We conclude that TrmB acts as a bifunctional transcriptional regulator acting on two different promoters and being differentially controlled by binding to different sugars. We believe this to represent a novel strategy of prokaryotic transcription regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.2005.04804.x
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  • 9
    Electronic Resource
    Electronic Resource
    The orientation of DNA in an archaeal transcription initiation complex (2000)
    [s.l.] : Nature America Inc.
    Nature structural biology 7 (2000), S. 782-785 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] RNA polymerase from the hyperthermophile archaeon Pyrococcus furiosus (Pfu) forms specific and transcriptionally active complexes with its conjugate transcription factors TBP (the archaeal TATA binding protein homolog) and TFB (the archaeal homolog of eukaryotic RNA polymerase II and III ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/79020
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  • 10
    Electronic Resource
    Electronic Resource
    Stetteria hydrogenophila, gen. nov. and sp. nov., a novel mixotrophic sulfur-dependent crenarchaeote isolated from Milos, Greece (1997)
    Springer
    Extremophiles 1 (1997), S. 67-73 
    Details
    ISSN: 1433-4909
    Keywords: Key words Hyperthermophilic ; Crenarchaeota ; Hydrogen and sulfur dependence ; Hydrothermal ; Stetteria hydrogenophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new hyperthermophilic, strictly anaerobic crenarchaeote, Stetteria hydrogenophila DSM11227 representing a new genus within the family of Desulfurococcaceae, was isolated from the sediment of a marine hydrothermal system at Paleohori Bay in Milos, Greece. Cells are gram-negative irregular and disc-shaped cocci, 0.5–1.5 μm in diameter, which are flagellate and can form cytoplasmatic protrusions up to 2 μm in length. The strain grew optimally at 95°C at pH 6.0 and at a NaCl concentration of 3%. The organism grew mixotrophically on peptide substrates. It required elemental sulfur as an external electron acceptor, and in addition, its growth was completely dependent on the presence of molecular hydrogen. Sulfur could be replaced by thiosulfate. H2S, CO2, acetate, and ethanol were identified as products of metabolism. The G + C content of DNA was 65 mol%. Analysis of its phylogenetic position by sequence analysis of 16S rRNA placed this organism in the family of Desulfurococcaceae. The dependence of this organism on both hydrogen and sulfur during growth on peptide substrates distinguishes Stetteria from all previously described species of Crenarchaeota.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007920050016
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