Curium has no known essential biological function. Biosorption of Cm³⁺ by bacteria and archaea has been reported (Moll et al, 2004; Ozaki et al, 2002).

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Ozaki T, Gillow JB, Francis AJ, Kimura T, Ohnuki T, Yoshida Z. Association of Eu(III) and Cm(III) with Bacillus subtilis and Halobacterium salinarium. J Nucl Sci Technol. 2002;Suppl. 3:950-53.