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The majority of microorganisms in natural environments resist laboratory cultivation. Sometimes referred to as ‘unculturable’, many phylogenetic groups are known only by fragments of recovered DNA. As a result, the ecological significance of whole branches of the ‘tree of life’ remains a mystery; this is particularly true when regarding genetic material retrieved from extreme environments. Geochemically...
The hydrothermally influenced sediments of Tutum Bay, Ambitle Island, Papua New Guinea, are ideal for investigating the chemolithotrophic activities of micro‐organisms involved in arsenic cycling because hydrothermal vents there expel fluids with arsenite (AsIII) concentrations as high as 950 μg L−1. These hot (99 °C), slightly acidic (pH ∼6), chemically reduced, shallow‐sea vent fluids mix with colder,...
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