TABLE 3

Summary of the samples used for all experiments conducted in this studya

Expt and sampleExperimentation under oxic
conditions
Experimentation under anoxic
conditions
CH3D14CH4CH3D14CH4
Aerobic methanotroph cultures
    M. trichosporium××
    M. sedimenti××
Seep sediments
    A.Sed-5128××××
    L.Sed-5043××××
Seep carbonates
    A.Carb-5305××××
    A.Carb-5152××××
    L.Carb-5028××××
Seep sediment at pressure
    A.Sed-3450×
  • a Cells with exes indicate that the experiment took place (with all relevant permutations and controls, as described in the text); blank cells indicate experiments that were not conducted. CH3D refers to the methanotrophic rate in experiments using the novel monodeuterated-methane technique, while 14CH4 refers to the radiolabel-based experiments. The three-part codes for samples derived from environmental material refer to active (A) or low-activity (L) sediments (Sed) or carbonates (Carb), along with a sample-specific four-digit serial number.