Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
Nitrogen fixation

especially changes nitrogen compounds, mostly amines such as NH2
both (a) and (b)
changes the free nitrogen (N2) to a form usable by plants
fix the free nitrogen (N2) by which it should not be usable by plants

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