Niobium has no known biological function. Some species of unicellular algae have been shown to accumulate the
radionuclide 95Nb (Morgan, 1961). Binding of niobium ions in solution by bacteria has also
been reported (Engel, 1970; Ishii, 2004).
For more information:
Medline for niobium AND bacteria
Engel WB. Role of metallic ion concentrating microorganisms in the corrosion of metals. Proc Conf Nat Ass
Corros Eng, 25th. 1970:588-96.
Ishii N, Tagami K, Enomoto S, Uchida S. Influence of microorganisms on the behavior of technetium and
other elements in paddy soil surface water. J Environ Radioact. 2004;77:369-80.
Morgan GB. Absorption of radioisotopes by certain microorganisms. Quart J Florida Acad Sci.