Description:
Growth conditions were one of the following: (a) Aerobic and chemoheterotrophic | (b) Anaerobic photoheterotrophic N2-fixing | (c) Anaerobic photoheterotrophic N2-fixing with a chemically reduced medium using Na2S and cysteine. Each of the above conditions was micronutrient replete (+Fe/+Mo) or limited for either Fe (-Fe/+Mo), Mo (+Fe/-Mo) or both micronutrients (-Fe/-Mo).