Table 2.

Oligonucleotide probes and their targeted microbial groups

Probe	Sequence (5′–3′)	Target group	Mixa	Reference
Neu 653	CCC CTC TGC TGC ACT CTA	Halotolerant and obligate halophilic Nitrosomonas	AOBmix	Wagner et al. (1995)
Nse 1472	ACCCCAGTCATGACCCCC	Nitrosomonas europaea, N. eutropha, N. halophila		Juretschko et al. (1998)
Nso 1225	CGCCATTGTATTACGTGTGA	Ammonia oxidizers β-Proteobacteria		Mobarry et al. (1996)
Nso 190	CGATCCCCTGCTTTTCTCC	Ammonia oxidizers β-Proteobacteria	–	Mobarry et al. (1996)
Nit 1035	CCT GTG CTC CAT GCT CCG	Nitrobacter spp.	NOBmix	Wagner et al. (1996)
Ntspa 662	GGA ATT CCG CGC TCC TCT	Nitrospira		Daims et al. (2000)
Nmv	TCCTCAGAGACTACGCGG	Nitrosococcus mobilis	–	Juretschko et al. (1998)
EUB 338 I	GCTGCCTCCCGTAGGAGT	Most bacteria	EUBmix	Amann et al. (1990)
EUB 338 II	GCAGCCACCCGTAGGTGT	Planctomycetes		Daims et al. (1999)
EUB 338 III	GCTGCCACCCGTAGGTGT	Verrucomicrobiales		Daims et al. (1999)

^aCombination of probes to detect a certain group of bacteria