Identification of bacteria potentially responsible for oxic and anoxic sulfide oxidation in biofilters of a recirculating mariculture system

Article Abstract:

The bacteria presumably involved in oxygen- or nitrate-dependent sulfide oxidation in the biofilters of a recirculating marine aquaculture system were identified, using a new application of reverse transcriptional-PCR denaturing gradient gel electrophoresis (DGGE) analysis termed as differential-transcriptional (DT)-DGGE. For the organisms the psychology of their closest cultured relatives matched their DT-DGGE-inferred functions.

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Nitrification in a biofilm at low pH values: Role of in situ microenvironments and acid tolerance

Article Abstract:

Strong nitrification at a pH around 4 was observed in biofilms grown on chalk particles and the hypotheses of the presence of less acidic microenvironments and/or the existence of acid-tolerant nitrifiers was investigated. Strong affinity to ammonia and possibly the expression of additional functions are adaptations that allow nitrifiers to cope with acidic conditions in biofilms and other habitats.

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Distribution, localization, and phylogeny of abundant populations of Crenarchaeota in anaerobic granular sludge

Article Abstract:

Eight anaerobic granular sludges are surveyed for Crenarchaeota using rRNA gene cloning. Group 1.3 Crenarchaeota represented up to 50% of Archaea and 25% of the total microbiota in five sludges.

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