Abstract
Cyanobacteria (bluegreen bacteria) are O₂-evolving
photosynthetic prokaryotes some species of
which fix N₂ in air because the nitrogenase is protected
from O₂ inactivation by being localized in differentiated
cells called heterocysts. Recently
much attention has been paid to the possible role of
plasmids as vehicles for the transfer of nif genes and
other genetic determinants associated with
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