Table 2.

Copy numbers of 16S rRNA and hzsA genes in Chinese anammox reactors^a

Reactor	Gene copy no. per ml of reactor vol		Ratio
	16S rRNA gene	hzsA gene
A1	3.7 × 107	2.9 × 107	1.3:1
A2	1.3 × 109	1.0 × 109	1.2:1
A3	1.2 × 109	2.4 × 108	4.9:1
A4	4.0 × 109	1.4 × 109	2.9:1
A5	2.2 × 109	7.9 × 108	2.8:1
A6	8.6 × 109	3.1 × 109	2.8:1
A7	5.9 × 109	6.0 × 108	9.8:1
A8	1.7 × 109	3.4 × 108	5.2:1

^aqPCR was performed with primer sets Amx694F-Amx960R and hzsA_1597F-hzsA_1857R (this study), targeting the 16S rRNA and hzsA genes. 16S rRNA qPCR data were extracted from the work of Hu et al. (8).