Introduction
Our idea was that if we grew samples on media that lacked nitrogen and
carbon sources than only nitrogen-fixing, photosynthetic organisms would
be able to grow. Also, by using media customized for cyanobacteria
we could further select for cyanobacteria among the nitrogen-fixing, photosynthetic
organisms. We collected samples both from quiet sunlight stream beds
with lots of green growth on the surface and from a fish tank in a microbiology
laboratory.