Praseodymium is used in the manufacture of colored glass and cigarette
lighters. Along with most of the other lanthanoid elements,
praseodymium is found naturally in phosphate and
fluoride-carbonate minerals. No essential biological role for
praseodymium is known. In the absence of Ca2+, Pr3+
restored 33% of Bacillus subtilis α-amylase activity (Smolka et al, 1971). Biosorption of Pr3+ by
Pseudomonas aeruginosa appeared to involve two types of binding
sites (Philip et al, 2000).
For more information:
Medline for praseodymium AND bacteria
Philip L, Lyengar L, Venkobachar C. Biosorption of U, La, Pr, Nd, Eu,
and Dy by Pseudomonas aeruginosa. J Indust Microbiol.