Fig. 1From: Impact of the electron donor on in situ microbial nitrate reduction in Opalinus Clay: results from the Mont Terri rock laboratory (Switzerland)Biological pathways that reduce nitrate include dissimilative nitrate reduction to nitrite (DNRN), to gaseous N species like NO, N2O and N2 (denitrification) and to ammonium (DNRA). Each of these pathways requires specific reductase enzymesBack to article page