Use of Cyanobacteria for the production of ethanol and natural

Cyanobacteria (blue-green algae) constitute the oldest and most primitive plant-like organisms on Earth and show a wide tolerance to environmental conditions. Cyanobacteria thrive in arid and semiarid regions, in the free waterzone of oceans and lakes, as well as on rocks of the littoral zone of aquatic and terrestrial ecosystems. They often live in environments that become at least periodically anoxic, for example in lake sediments, in microbial mats of the littoral zone, or during symbiosis in the rhizosphere of higher plants.