FIG 1.
H2 uptake by R. pachyptila compared to vessels without R. pachyptila (control), calculated using the least square (LS) means of the difference in H2 concentrations in the seawater entering and leaving the pressure vessels. For the control, vessels without R. pachyptila were supplied with H2 gas (∼100 μM) with either low (∼30 μM) or high (∼250 μM) O2 concentrations. Data from these control vessels were aggregated, as no significant difference of uptake was found between them. Furthermore, no significant difference was found in H2 uptake when comparing control vessels to those containing R. pachyptila (α = 0.05).