Structural and functional dynamics of sulfate-reducing populations in bacterial biofilms

Article Abstract:

The combined applications of microsensors and molecular techniques were described to examine the development of sulfate reduction of sulfate-reducing bacterial populations in an aerobic bacterial biofilm. Sulfate reduction was first detected after six weeks of growth. It was shown that sulfate reducers were present in high numbers in all stages of development, both in the oxic and anoxic zones of the biofilm. Denaturing gradient gel electrophoresis showed that the genetic diversity of the microbial community increased during the development of the biofilm.

Bacteria, Aerobic, Aerobic bacteria, Sulfur compounds

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On the occurrence of anodic microniches, denitrification, and sulfate reduction in aerated activated sludge

Article Abstract:

Research was conducted to examine the occurrence of anaerobic processes in aerated activated sludge using a combination of various techniques. Microsensor calculations were taken for the different parameters in 250 individual activated sludge flocs. Results indicate that the respiration capacity of activated sludge is simply not sufficient to create anoxia under air saturation. A likely explanation for the absence of anoxia may be that oxygen transport is not only diffusional but enhanced by advection.

Hypoxia, Anoxia, Denitrification, Sulfates

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Distribution of sulfate-reducing and methanogenic bacteria in anaerobic aggregates determined by microsensor and molecular analyses

Article Abstract:

Research was conducted to determine the distribution of sulfate reducing and methane producing bacteria in the upflow anaerobic sludge bed (UASB). Results show that sulfate reducing bacteria were predominantly found in the outer layer, whereas methanogenic bacteria were mainly in the core of UASB aggregates.

Germany, Analysis, Observations, Microbial aggregation, Cladistic analysis

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