Most cells have an absolute requirement for iron. Due to the insolubility of ferric hydroxide, the element is often growth limiting under aerobic conditions. Microbial iron bioavailability is largely controlled by the presence of chelating agents that are able to solubilize environmental iron hydroxides and maintain the soluble iron concentration in an optimal domain for cell growth. These chelating agents, called siderophores, highly efficient and virtually Fe~(3+) specific chelators, are synthesized by ba...
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