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. 2004 May;70(5):3096–3102. doi: 10.1128/AEM.70.5.3096-3102.2004

FIG. 2.

FIG. 2.

Effect of O2 concentration on growth, N2-fixing activity (ARA), and hydrogen evolution by Clostridium sp. strain B901-1b (A) and synergetic effects of separate cultures of B901-1b and B901-2 on N2-fixing activity (B). C and E, inoculation of Clostridium sp. strain B901-1b and Enterobacter sp. strain B901-2, respectively. Gray shading shows bacterial growth after 4 days. ARA+, positive for ARA (106 nmol of ethylene produced h−1 tube−1); −, no ARA (<0.1 nmol of ethylene produced h−1 tube−1).