. Structurally they range from unic

. Structurally they range from unicellular to colony forming
and filamentous forms. Regardless of form, certain cyanobacteria have
the capacity to fix atmospheric nitrogen (N2) into ammonia through
the action of the enzyme complex nitrogenase. This makes cyanobacteria
important contributors of nitrogen into nutrient poor environments .
There is a rapidly growing interest to use cyanobacteria as photosynthetic
microbial cell factories for the direct production of solar fuels
and or other compounds of human interest. However, rates
and efficiencies are still very low . The amount of available carbon
for the synthesis of desired product(s) may be one of the limiting steps. In addition, an increased production level of purpose designed,
carbon-containing molecules that are excreted from the cells and harvested
for further use highlights the need for additional carbon fixation
in the cells. Thus, possibilities to make the process of carbon fixation
more efficient with higher rates and yields attract new as well as increased
attention.