TABLE 1 

Overview of experiments

ExperimentO2 treatmentaReactorH2S (µM)bO2 concn (nM)cGene expression analyzed
InitialdFirst halfSecond half
AvgSEMaxeAvgSEMaxe
1AHL11452,737.8795.63,671.813.15.421.5
1BLH29439.96.856.6200.347.1275.3
1BLH312591.99.0106.5201.454.3288.9x
1CLH437788.67.6105.6558.3146.1819.4x
1CLH54528.32.232.5486.771.6607.8
1 DLH67851.02.356.81,766.239.71,835.4x
1EL75421.211.356.934.22.939.4x
1EL822241.86.957.072.576.7205.4x
2AHL1251,830.1148.02,105.57.12.816.4x
2AHL6621,781.9182.32,183.72.64.139.4
2BH41611,680.4283.02,176.41,630.1179.01,935.2
2BH8281,806.7198.72,138.31,723.5236.92,106.3x
2CLH31,67032.35.743.91,537.2416.92,233.4x
2CLH71916.83.426.91,756.2149.82,056.2
2DL2819.45.429.610.56.157.1x
2DL54111.83.117.27.11.911.9x
3ALH51.15715.011.999.8393.7128.4706.3
3ALH61.0447.75.821.7391.250.9479.2
3BLH31.23837.39.549.81,789.9389.22,655.2
3CL71.34513.413.243.17.87.834.9
3CL81.4364.14.120.53.51.88.5
3DL10.06817.83.326.69.03.519.8
3DL20.03414.82.719.17.02.512.2
  • a L, continuously low; H, continuously high; LH, low during the first half and high during the last half; HL, high during the first half and low during the last half.

  • b Average H2S (sum of H2S, HS, and S2−) concentrations during the incubations (experiment 3 only).

  • c SE, standard error of the average.

  • d First recorded concentration when the reactor was fitted with a STOX sensor.

  • e Highest recorded O2 concentrations after the initial helium gassing.