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      Biogeochemical ecology ofThiothrixspp. In underwater limestone caves

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      Geomicrobiology Journal

      Informa UK Limited

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          Fluorescent-oligonucleotide probing of whole cells for determinative, phylogenetic, and environmental studies in microbiology.

          Fluorescent-dye-conjugated oligonucleotides were used to classify 14 Fibrobacter strains by fluorescence microscopy. On the basis of partial 16S rRNA sequences of six Fibrobacter strains, four hybridization probes were designed to discriminate between the species Fibrobacter succinogenes and Fibrobacter intestinalis and to identify F. succinogenes subsp. succinogenes. After in situ hybridization to whole cells of the six sequenced strains, epifluorescence microscopy confirmed probe specificity. The four probes were then used to make presumptive species and subspecies assignments of eight additional Fibrobacter strains not previously characterized by comparative sequencing. These assignments were confirmed by comparative sequencing of the 16S rRNA target regions from the additional organisms. Single-mismatch discrimination between certain probe and nontarget sequences was demonstrated, and fluorescent intensity was shown to be enhanced by hybridization to multiple probes of the same specificity. The direct detection of F. intestinalis in mouse cecum samples demonstrated the application of this technique to the characterization of complex natural samples.
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            Biological communities at the Florida escarpment resemble hydrothermal vent taxa.

            Dense biological communities of large epifaunal taxa similar to those found along ridge crest vents at the East Pacific Rise were discovered in the abyssal Gulf of Mexico. These assemblages occur on a passive continental margin at the base of the Florida Escarpment, the interface between the relatively impermeable hemipelagic clays of the distal Mississippi Fan and the jointed Cretaceous limestone of the Florida Platform. The fauna apparently is nourished by sulfide rich hypersaline waters seeping out at near ambient temperatures onto the sea floor.
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              Chemoautotrophic growth of a marine Beggiatoa in sulfide-gradient cultures

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                Author and article information

                Journal
                Geomicrobiology Journal
                Geomicrobiology Journal
                Informa UK Limited
                0149-0451
                1521-0529
                July 1994
                July 1994
                : 12
                : 3
                : 141-159
                Article
                10.1080/01490459409377982
                © 1994

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