TABLE 2.
Nitrogen source used for different media.
| Nitrogen source | Medium A | Medium B | Medium C | Medium D | Medium E |
| 5 mM (NH4)2SO4 | + | − | − | − | + |
| 5 mM (15NH4)2SO4 | − | + | + | − | − |
| 3 mM NaNO2 | − | − | + | + | − |
| 3 mM Na15NO2 | − | − | − | − | + |
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