[1] Univ Michigan, Dept Chem & Biochem, Ann Arbor, MI 48109 USA
[2] Univ Minnesota, Dept Biochem Mol Biol & Biophys, Minneapolis, MN 55455 USA
[3] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
[4] Univ Tuscia, Dept Environm Sci Di SA, Viterbo, Italy