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Accumulation and depletion of H2 in a coastal cyanobacterial mat as a function of time after darkening (see numbers and color legends in the graph). Prior to darkening, the mat was incubated under a photon irradiance of 500 μmol photons m-2 s-1 in aerated seawater for 8 h without (A,B) and for 6 h with 2.5 mM molybdate (C). Note the use of different concentration ranges in the different panels.
