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Effects of various electron donors and azide on the respiratory reduction of WST-1 by mycobacteria (Myc.) and sphingomonads (Sph.) grown for 7 days in microtiter plates with PAHs as sole sources of carbon and energy. The plates were incubated with WST-1 for 90 min. The controls included wells with no PAH but with inoculum and the combined e-donors and wells without bacteria but with PAHs and the combined e-donors. The error bars represent ±1 standard deviation.
