Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodomicrobium
Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
All of these
demonstrating growth in a nitrogen free medium
measuring15N2 by mass spectrometer

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