Evidence for aceticlastic methanogenesis in the presence of sulphate in a gas condensate-contaminated aquifer

Article Abstract:

The anaerobic metabolism of acetate was studied in sediments and groundwater from a gas condensation contaminated aquifer in an aquifer where geochemical evidence implicated sulfate reduction and methanogenesis as the predominant terminal electron-accepting processes. Most-probable-number tubes containing either [2-(super 14)C]acetate or [U-(super 14)C]acetate produced higher quantities of CH4 compared to CO2 in the presence or absence of sulphate.

Methanobacteriaceae, Methanogens, Acetates, Chemical properties, Anaerobic respiration

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Impact of trichloroethylene and toluene on nitrogen cycling in soil

Article Abstract:

A study was conducted on the influence of toluene and trichloroethylene on nitrogen cycling in soil. Results reveal that trichloroethylene concentrations do not affect arginine ammonification potential and denitrification enzyme activity. Results also show that such soil microbial populations as protozoa, bacteria and nematodes that promote nitrogen cycling have different sensitivities to toluene and trichloroethylene.

Soil microbiology, Soils, Trichloroethylene, Soil nitrogen

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Determination of in situ bacterial growth raes in aquifers and aquifer sediments

Article Abstract:

The development of a method to determine microbial growth rates in situ in aquifers and aquifer sediments is described. The technique utilizes fluorescent stains coupled with flow cytometry. Results indicate that the method enables determining growth rates in situ and to discriminate between changes in planktonic bacterial levels due to growth rates or attachment or detachment processes.

United States, Methods, Measurement, Physiological aspects, Growth, Bacterial growth, Cell research, Cytological research, Plankton populations, Company growth

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