Get binary azo-cyano working with CO2 and N2 as sole carbon and nitrogen sources

[Jeremy Zucker]

[Andrew McNaughton]

First pass optimization with EX_co2_m and EX_n2_m results in no community growth and only Azotobacter has growth.

compartments	growth_rate
Azotobacter	0.099724
Synechococcus	0.000000

Need to experiment with levels of co2_m levels to make up for missing carbon.