Abstract

From 85 samples taken during cruise 45B of the R/V SONNE within the Sunda Arc subduction zone and from solfatara fields in Java, thermophilic and hyperthermophilic archaea and bacteria were isolated. The archaea were found to belong to the genera Methanobacterium, Methanolobus, Methanosarcina, Acidianus, Thermoproteus, Desulfurococcus, Thermoplasma, Thermococcus and a so far unknown thermoacidophilic continental metal mobilizer. All 7 Thermoplasma isolates were found to represent a new genotype so far only found in Indonesia. The extremely thermophilic bacterial isolates are a new species of Thermotoga and a novel strict anaerobe, thriving by H 2 /NO 3 - autotrophy.

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