. 2003 Nov;69(11):6447–6454. doi: 10.1128/AEM.69.11.6447-6454.2003

TABLE 2.

Anaerobic ammonium oxidation measured by production of ²⁹N₂ with ¹⁵N labelling of either the NO₃⁻ or NH₄⁺ pools

Site	Actual ³⁰N₂ (% ¹⁵N gas)	Predicted ²⁹N₂ (% ¹⁵N gas)^a	Actual ²⁹N₂ (% ¹⁵N gas)^b	A₂₉ (% ¹⁵N gas)^c	Probability of ¹⁵N from ¹⁵NH₄⁺^d	AAO^e from:
Site	Actual ³⁰N₂ (% ¹⁵N gas)	Predicted ²⁹N₂ (% ¹⁵N gas)^a	Actual ²⁹N₂ (% ¹⁵N gas)^b	A₂₉ (% ¹⁵N gas)^c	Probability of ¹⁵N from ¹⁵NH₄⁺^d	¹⁵NO₃⁻ (μmol)	¹⁵NH₄⁺ (μmol)
2 Grays	90.58	1.86	9.42	7.82	0.49	0.261 (0.019)	0.296 (0.0289)
3 Gravesend	93.77	1.99	6.23	4.37	0.56	0.120 (0.0228)	0.160 (0.0164)
4 Allhallows	95.44	1.93	4.56	2.71	0.27	0.040 (0.0045)	0.026 (0.0033)
6 Grain	97.60	1.85	2.40	0.57	0.54	0.004 (0.0006)	0.003 (0.0005)

From >98 atom % ¹⁵N-NO₃⁻ and random pairing of ¹⁴N and ¹⁵N.

As a proportion of total measured ¹⁵N gases.

A₂₉ = P₂₉ − D₂₉ (see the text and reference 30).

[¹⁵NH₄⁺]/[total NH₄⁺].

Anaerobic ammonium oxidation (AAO) with ¹⁵N-labeled NO₃⁻ (n = 4) or NH₄⁺ (n = 3). Figures in parentheses are SEM.