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

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

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Microbiology of Soils
Syntrophism involves

exchange of nutrients between two species
no exchange of nutrients among species
exchange of nutrients among species
no exchange of nutrients between two species

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