In general aqueous iron occurs mainly as Fe(III) organic complexes, which are capable of supplying bioavailable Fe (Butler, 1998; Hutchins et al., 1999). Uncomplexed Fe(III) (and Fe(II) produced by reduction) is more readily bioavailable than their equivalent organic complexes (Sunda, 2001). However, the cells of most organisms are impermeable to highly charged or polar species and membrane transporters are necessary for Fe uptake into the cell. Different organisms have developed different strategies to acquire iron; in general eukaryotic phytoplankton directly take up inorganic iron using membrane transporters that bind with labile Fe species whilst prokaryotes excrete siderophores...

First Page Preview

First page PDF preview
You do not currently have access to this article.