Denitrifying bacteria in the earthworm gastrointestinal tract and in vivo emission of nitrous oxide (N2O) by earthworms

Article Abstract:

The activity of denitrifying bacteria in the gut of Lumbricus rubellus and Ostoclasium lacteum was analyzed to determine the role of earthworms in the synthesis of VH or N2O in terrestrial ecosystems. Denitrifying activity was exhibited by 3% to 10% of the microbes isolated from earthworm gut material. The anaerobic gut homogenates also catalyzed the synthesis of N2O and N2 from nitrate after prolonged incubation. Furthermore, N2O production by earthworms was also mediated by nitrification, assimilatory nitrate reduction and dissimilatory reduction of nitrate to ammonium.

Physiological aspects, Microbiological synthesis, Earthworms

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Spatial heterogeneity in the distribution of denitrifying bacteria associated with denitrification activity zones

Article Abstract:

The spatial heterogeneity in the distribution of denitrifying enzyme activity (DEA) was 3.5 times more in artificial denitrification activity zones than in bulk soil and the denitrifier biomass was 1-4 times more in activity zones. The potential heterogeneous distribution of denitrifying bacteria should be considered while measuring the denitrifying specific activity.

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Chloramphenicol inhibition of denitrifying enzyme activity in two agricultural soils

Article Abstract:

Chloramphenicol should not be used in denitrifying enzyme activity (DEA) assays in concentrations greater than 0.1 g/liter. The antibiotic is used in these assays to inhibit the synthesis of new denitrifying enzymes, but it inhibits existing enzymes as well.

Usage, Measurement, Soils, Soil analysis, Chloramphenicol

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