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COMPARATIVE STUDIES OF NITROGEN FIXATION AND PHOTOSYNTHESIS IN ANABAENA CYLINDRICA
Author(s) -
Cobb Howell D.,
Myers Jack
Publication year - 1964
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1964.tb06697.x
Subject(s) - photosynthesis , nitrogen fixation , nitrogen , biology , carbon dioxide , carbon fixation , ammonia , fixation (population genetics) , oxygen , nitrogen cycle , botany , biochemistry , ecology , chemistry , organic chemistry , gene
Manometric methods were developed to allow short‐time measurements on relatively small amounts of cell material. The methods provided measurement of the nitrogen uptake and oxygen evolution attributable to nitrogen fixation either in the presence or absence of carbon dioxide. The methods were applied to observe effects of cell history, light intensity, temperature, pH, and ammonia on nitrogen fixation and photosynthesis with 2 new and significant findings. Nitrogen fixation is markedly accelerated by a preceding period of cellular nitrogen depletion. Nitrogen fixation is depressed by light intensities greater than those required to saturate photosynthesis.