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EPR spectra of C. sporogenes cells grown in the presence of SNP. (A) Control cells, recorded at a temperature of 16 K. (B) Cells grown with 20 μM SNP at 16 K. (C) Cells grown with 40 μM SNP at 16 K. Cells were harvested 6 h after SNP was added. Measurement conditions: microwave frequency, 9.365 GHz; power, 20 mW; gain, 2 × 104; modulation amplitude, 0.2 mT.
