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  • 1
    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
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  • 2
    ISSN: 1432-072X
    Keywords: Sporomusa ; Sporomusa ovata ; Sporomusa sphaeroides ; Selenomonas ruminantium ; Megasphoera elsdenii ; Phylogeny of Gram-positive eubacteria ; Evolution ; 16S rRNA cataloguing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to determine the phylogenetic relationships of representatives of three Gram-negative genera, Sporomusa, Selenomonas, and Megasphaera, the 16S ribosomal RNAs were compared by oligonucleotide cataloguing. Surprisingly, Sporomusa ovata, S. sphaeroides, Selenomonas ruminantium, and Megasphaera elsdenii do not group with any of the 200 Gram-negative eubacterial species investigated so far by this method but show a distinct although remote relationship to Gram-positive eubacteria of the “Clostridium subdivision”. The presence of Gram-negative species within the radiation of the cluster defined by Gram-positive cubacteria reduces the significance the Gram-positive staining behaviour plays in taxonomic and phylogenetic studies. It furthermore supports previous findings showing the Gram-negative and phototrophic species Heliobacterium chlorum to be a member of the Clostridium-Bacillus cluster. The presence of Gram-negative endospore-containing Sporomusa species among the 16S rRNA cluster of Gram-positive endospore-forming eubacteria allow speculations about the evolutionary origin of Gram-positive eubacteria.
    Type of Medium: Electronic Resource
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  • 3
    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
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  • 4
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
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