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Received:10 March 2011 Accepted:29 July 2011 Published:29 July
2011  © 2011 Resendis-Antonio et al; licensee BioMed Central
Ltd.           Biological nitrogen fixation carried out by
Rhizobiaceas represents nearly 70 percent of the entire nitrogen
transformation required for maintaining life in our biosphere.
Simultaneously, nitrogen fixation driven by these bacteria
constitutes an appealing and natural strategy for developing
sustainable agricultural programs due to its cost-effectiveness
in crop improvement and its more environmentally friendly
effects in comparison to those produced by chemical fertilizers
[1]. Based on these fundamental and practical issues, the study
of bacterial nitrogen fixation is one active line of research
that in the post-genomic era demands new paradigms capable of
surveying in a systematic fashion the metabolic organization by
which this process occurs in nature.  At a m