| http://www.w3.org/ns/prov#value | - ction of organic complexing ligands such as siderophores that are excreted to the extracellular milieu to solubilize the metal (hydr)oxides (Weber et al., 2006), and (iii) production of low-molecular-weight redox-active organic molecules that shuttle electrons between oxidized and reduced compounds (Hernandez and Newman, 2001).
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