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Table 1 Denitrification genes in dental biofilms of five volunteers

From: Denitrification in human dental plaque

Volunteer NO3- reductase NO2- reductase NO reductase N2O reductase
  narG nirS nirK cnorB qnorB nosZ
A + + + - + +
B + + + - + +
C + + + - + +
D + - + - + +
E + NA NA - + NA
  1. Results are based on detection of a PCR product with the expected size or on the additional analysis of the sequence of the PCR product.
  2. NA = not analysed.