Table 2 Incorporation of 15N2 gas by PNG and Japanese faecal samples.

From: Nitrogen fixation and nifH diversity in human gut microbiota

Sample ID

δ15N value a (‰)

Δδ15N b

p value c

15N2 gas (+)

15N2 gas (−)

PNG

 V001

5.90 ± 0.32

4.83 ± 0.10

1.07

0.0025

 V004

4.26 ± 0.22

3.09 ± 0.38

1.17

0.0049

 V009

6.17 ± 0.26

5.33 ± 0.04

0.84

0.0139

 V014

6.44 ± 0.60

5.32 ± 0.05

1.11

0.0429

 V022

6.32 ± 0.60

5.64 ± 0.05

0.68

0.0283

 V035

3.74

2.66

1.08

N. A.

Japanese

 J001

7.48

6.22 ± 0.33

1.26

N. A.

 J002

5.58 ± 0.18

4.78 ± 0.21

0.80

0.0041

Sterile control

 V004

3.22

3.09 ± 0.38

0.13

N. A.

 V009

4.86

5.33 ± 0.04

− 0.47

N. A.

 J002

4.66 ± 0.08

4.78 ± 0.21

− 0.12

0.2066

  1. aAverages and SD of triplicate samples are shown. For duplicate samples, only average values are shown.
  2. bΔδ15N = δ15N[15N2 (+)] − δ15N [15N2 (−)].
  3. cStudent’s t test for V001 and V004; Welch’s t test for the other samples. N. A., not applicable.
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