Table 2.

Probes used in this study.

Probe	Target group
EUB338-I	Most (90%) Bacteria	GCT-GCC-TCC-CGT-AGG-AGT	Amann et al., 1990
DELTA495A	Most deltaproteobacteria	AGT-TAG-CCG-GTG-CTT-CCT	Loy et al., 2002
GAM42A	Gammaproteobacteria	GCC-TTC-CCA-CAT-CGT-TT	Manz et al., 1998
BET42	Betaproteobacteria	GCC-TTC-CCA-CTT-CGT-TT	Manz et al., 1998
SRB385	Most desulfovibrionales	CGG-CGT-CGC-TGC-GTC-AGG	Amann et al., 1990
DSS-658a	Desulfobacteraceae	TCC-ACT-TCC-CTC-TCC-CAT	Manz et al., 1998
DSM651	Desulfuromusa spp.	CCT-CTC-CCA-TAC-TCA-AG	This study
DSM651 competitor	Desulfuromusa spp.	CCT-CTC-CCA-TAC-TCT-AG	This study

^aUsed as probe and primer.