FBA (flux-balance analysis) is an software used in the analysis of metabolic behavior. FBA can be used to study metabolic systems. The fundamental principle of FBA is the conservation of mass.
Another FBA website @ UCSD
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Edwards JS, Ibarra RU, Palsson BO. (2001) Nat Biotechnol Feb;19(2):125-30 In silico predictions of Escherichia coli metabolic capabilities are consistent with experimental data.
Edwards JS, Palsson BO (2000) Proc Natl Acad Sci May 9;97(10):5528-33. The Escherichia coli MG1655 in silico metabolic genotype: its definition, characteristics, and capabilities.