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  • 1
    Electronic Resource
    Electronic Resource
    The architecture of 5S rRNA and its relation to function (1975)
    Springer
    Journal of molecular evolution 6 (1975), S. 61-76 
    Details
    ISSN: 1432-1432
    Keywords: 5S ribosomal RNA ; Translation ; Evolution ; Molecular Architecture ; Conformational Changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An extensive comparative analysis of the available primary sequence data on 5S rRNA has been made. A universal secondary structure is presented for procaryotic 5S rRNA which contains four helical regions. Eucaryotic 5S rRNAs are found to have only three of these helices and thus have a somewhat different architecture. In addition, a highly conserved segment of more than thirty nucleotides is identified in the 5′ half of the procaryotic molecule. This segment includes the oligonucleotide-CGAAC- which presumably binds to the t-RNA “common” sequence-GTΨCG-. Among the eucaryotes, the plants display a procaryotic nature in this region, but no eucaryote has the sequence -CGAAC- in this segment. A functional role for the procaryotic 5S rRNA molecule is discussed in which it is envisioned to undergo conformational change, i.e., coiling and uncoiling of one of the helices, which can result in a cyclic interaction of the 5S rRNA molecule with two t-RNA molecules. A general principle also emerges: the natural rotational motion inherent in coiling and uncoiling of nucleic acid helices can be converted quite simply to linear mechanical motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732674
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Heliobacterium modesticaldum, sp. nov., a thermophilic heliobacterium of hot springs and volcanic soils (1995)
    Springer
    Archives of microbiology 163 (1995), S. 259-267 
    Details
    ISSN: 1432-072X
    Keywords: Anoxygenic phototrophic bacteria ; Heliobacteria ; Heliobacterium modesticaldum ; Thermophily ; Hot springs ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Enrichment cultures for heliobacteria at 50°C yielded several strains of a thermophilic heliobacterium species from Yellowstone hot spring microbial mats and volcanic soils from Iceland. The novel organisms grew optimally above 50°C, contained bacteriochlorophyll g, and lacked intracytoplasmic membranes. All isolates were strict anaerobes and grew best as photoheterotrophs, although chemotrophic dark growth on pyruvate was also possible. These thermophilic heliobacteria were diazotrophic and fixed N2 up to their growth temperature limit of 56°C. Phylogenetic studies showed the new isolates to be specific relatives of Heliobacterium gestii and, as has been found in H. gestii, they produce heat-resistant endospores. The unique assemblage of properties found in these thermophilic heliobacteria implicate them as a new species of this group, and we describe them herein as a new species of the genus Heliobacterium, Heliobacterium modesticaldum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393378
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A thermophilic green sulfur bacterium from New Zealand hot springs, Chlorobium tepidum sp. nov. (1991)
    Springer
    Archives of microbiology 156 (1991), S. 81-90 
    Details
    ISSN: 1432-072X
    Keywords: Chlorobium tepidum ; Photosynthesis ; Green sulfur bacteria ; Chlorosomes ; Bacteriochlorophyll ; Thermophily ; Hot springs ; 16S rRNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thermophilic green sulfur bacteria of the genus Chlorobium were isolated from certain acidic high sulfide New Zealand hot springs. Cells were Gram-negative nonmotile rods of variable length and contained bacteriochlorophyll c and chlorosomes. Cultures of thermophilic chlorobia grew only under anaerobic, phototrophic conditions, either photoautotrophically or photoheterotrophically. The optimum growth temperature for the strains of thermophilic green sulfur bacteria isolated was 47–48°C with generation times of about 2 h being observed. The upper temperature limit for growth was about 52°C. Thiosulfate was a major electron donor for photoautotrophic growth while sulfide alone was only poorly used. N2 fixation was observed at 48°C and cell suspensions readily reduced acetylene to ethylene. The G+C content of DNA from strains of thermophilic chlorobia was 56.5–58.2 mol% and the organisms positioned phylogenetically within the green sulfur bacterial branch of the domain Bacteria. The new phototrophs are described as a new species of the genus Chlorobium, Chlorobium tepidum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290978
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Heliobacterium modesticaldum, sp. nov., a thermophilic heliobacterium of hot springs and volcanic soils (1995)
    Springer
    Archives of microbiology 163 (1995), S. 259-267 
    Details
    ISSN: 1432-072X
    Keywords: Key words Anoxygenic phototrophic bacteria ; Heliobacteria ; Heliobacterium modesticaldum ; Thermophily ; Hot springs ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Enrichment cultures for heliobacteria at 50°C yielded several strains of a thermophilic heliobacterium species from Yellowstone hot spring microbial mats and volcanic soils from Iceland. The novel organisms grew optimally above 50°C, contained bacteriochlorophyll g, and lacked intracytoplasmic membranes. All isolates were strict anaerobes and grew best as photoheterotrophs, although chemotrophic dark growth on pyruvate was also possible. These thermophilic heliobacteria were diazotrophic and fixed N2 up to their growth temperature limit of 56°C. Phylogenetic studies showed the new isolates to be specific relatives of Heliobacterium gestii and, as has been found in H. gestii, they produce heat-resistant endospores. The unique assemblage of properties found in these thermophilic heliobacteria implicate them as a new species of this group, and we describe them herein as a new species of the genus Heliobacterium, Heliobacterium modesticaldum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393378
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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