1. 
   siderophores
   Natural iron-binding compounds that chelate ferric ions (which form insoluble colloidal hydroxides at neutral pH and are then inaccessible) and are then taken up together with the metal ion. See sideramines.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   siderophores
   Low-molecular-weight compounds produced by microorganisms that aid in the transport and sequestration of ferric iron. (the encyclopedia of molecular biology, 1994) ... (12 Dec 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?siderophores
   
   

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