Nitrogenase activity and estimates of nitrogen fixation by freshwater benthic blue‐green algae

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• Present address: Water and Soil Science Centre, Ministry of Works and Development, Private Bag, Hamilton, New Zealand.
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• Present address: Freshwater Section, Ecology Division, Department of Scientific and Industrial Research, Box 415, Taupo, New Zealand.
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• Present address: Department of Biological Sciences, University of Waikato, Private Bag, Hamilton, New Zealand.
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