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Microbial Diversity of Hydrothermal Sediments in the Guaymas Basin: Evidence for Anaerobic Methanotrophic Communities
The combined evidence from bacterial phylogeny and molecular-isotopic data indicates an important role of some novel deeply branching bacteria in anaerobic methanotrophy in the trophic ecology of methane-rich hydrothermal vents.
Late Proterozoic rise in atmospheric oxygen concentration inferred from phylogenetic and sulphur-isotope studies
The evolution of non-photosynthetic sulphide-oxidizing bacteria was contemporaneous with a large shift in the isotopic composition of biogenic sedimentary sulphides between 0.64 and 1.05 billion
Biogeographical distribution and diversity of microbes in methane hydrate-bearing deep marine sediments on the Pacific Ocean Margin.
Results from cluster and principal component analyses, which include previously reported data from the West and East Pacific Margins, suggest that, for these locations in the Pacific Ocean, prokaryotic communities from methane hydrate-bearing sediment cores are distinct from those in Hydrate-free cores.
Phylogenetic relationships ofThiomicrospira species and their identification in deep-sea hydrothermal vent samples by denaturing gradient gel electrophoresis of 16S rDNA fragments
DGGE analysis of PCR-amplified 16S rDNA fragments was used to explore the genetic diversity of hydrothermal vent microbial communities, specifically to determine the importance of sulfur-oxidizing bacteria therein, and identified three ‘phylotypes’ which represented a newThiomicrospira species, phylogenetically in an intermediate position between Tms.
Evolutionary relationships among ammonia- and nitrite-oxidizing bacteria
The nitrifiers, as a group, apparently are not derived from an ancestral nitrifying phenotype, and consideration of physiology and phylogenetic distribution suggested that nitrite-oxidizing bacteria of the alpha and gamma subdivisions are derived from immediate photosynthetic ancestry.
Dense populations of a giant sulfur bacterium in Namibian shelf sediments.
A previously unknown giant sulfur bacterium is abundant in sediments underlying the oxygen minimum zone of the Benguela Current upwelling system, and is closely related to the marine filamentous sulfur bacteria Thioploca, abundant in the up welling area off Chile and Peru.
Heterotrophic Archaea dominate sedimentary subsurface ecosystems off Peru.
It is shown that extractable archaeal rRNA, selecting only for active community members in these ecosystems, is dominated by sequences of uncultivated Archaea affiliated with the Marine Benthic Group B and the Miscellaneous Crenarchaeotal Group, whereas known methanotrophic Archaea are not detectable.
Molecular Characterization of Sulfate-Reducing Bacteria in the Guaymas Basin
ABSTRACT The Guaymas Basin (Gulf of California) is a hydrothermal vent site where thermal alteration of deposited planktonic and terrestrial organic matter forms petroliferous material which supports
Benthic eukaryotic diversity in the Guaymas Basin hydrothermal vent environment
By using sequence comparisons of PCR-amplified small subunit ribosomal RNAs, eukaryotic diversity in hydrothermal vent environments of Guaymas Basin in the Gulf of California is characterized and the adaptation to anoxic environments is evidenced by specific affinity of environmental sequences to aerotolerant anaerobic species in molecular trees.
Uncultured archaea in deep marine subsurface sediments: have we caught them all?
Deep marine subsurface sediments represent a novel archaeal biosphere with unknown physiology; the sedimentary subsurface harbors numerous novel phylogenetic lineages of archaea that are at present