Marine oscillatoria (Trichodesmium): explanation for aerobic nitrogen fixation without heterocysts.

  title={Marine oscillatoria (Trichodesmium): explanation for aerobic nitrogen fixation without heterocysts.},
  author={Edward J. Carpenter and Catherine C. Price},
  volume={191 4233},
Nitrogen fixation in marine Oscillatoria appears to be associated with differentiated cells located in the center of the colony. These central cells exhibit reduced pigmentation relative to peripherally located cells and do not incorporate 14CO2 in photosynthesis. Central cells apparently do not produce O2 which would deactivate nitrogenase. When central cells are exposed to O2 via disruption of the colonies, N2 fixation (acetylene reduction) decreases sharply even though individual trichomes… CONTINUE READING

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