Stable-isotope analysis of a combined nitrification-denitrification sustained by thermophilic methanotrophs under low-oxygen conditions

Article Abstract:

Significant loss of nitrogen from a model composting system, a pO2-auxostat, is due to combined nitrification and denitrification, catalyzed by thermophilic methanotrophs under low oxygen conditions. The nitrification and the denitrification rates increase with the increase in pO2. 13C labelling show the absence of autotrophic nitrifying populations, and indicate that ammonia oxidation in the autostats is of heterotrophic origin.

Analysis, Causes of, Physiological aspects, Oxygen, Compost, Denitrification, Nitrification

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Association of marine archaea with the digestive tracts of two marine fish species

Article Abstract:

Research was conducted to examine the association of group I and II marine archaea with the digestive tracts of two fish species which are commonly found in the North Sea, namely, flounder and grey mullet. Results demonstrate that certain marine fish species host marine archaea in their digestive tracts and that the feces of these fish could be a source of particle-associated marine archaea.

Marine bacteria, Digestive organs, Digestive system, Marine fishes

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Biomarker evidence for widespread anaerobic methane oxidation in Mediterranean sediments by a consortium of methanogenic archaea and bacteria

Article Abstract:

Anaerobic methane oxidation appears to occur in marine sediments through the action of methanogenic archaea and bacteria acting in reverse. This was the conclusion of researchers who analyzed marine sediments from mud volcanoes on the Mediterranean Ridge.

Methane

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