[1] Univ Arkansas, Dept Biomed Engn, Fayetteville, AR 72701 USA
[2] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA
[3] Univ Arkansas, Inst Nanosci & Engn, Fayetteville, AR 72701 USA
[4] Univ Arkansas Med Sci, Dept Pharmacol & Toxicol, Little Rock, AR 72205 USA