الفهرس 
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Abstract
Cyanobacteria (blue-green algae), many species of which can fix N2, are
02 evolving photosynthetic prokaryotes. They bear a resemblance to gliding
bacteria in gross morphology, to some photosynthetic bacteria in being able to
fix both CO2 and N2 using light energy and to eukaryotic algae and higher
plants in having chlorophyll a and in being able to photolyze water.
Nevertheless, we still do not understand why and how most of cyanobacteria
are obligate photoautotrophs, i.e. can use only light energy for their
macromolecular synthesis.