a
School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, Indiana, USA
E-mail: wereley@purdue.edu
;
Fax: +1 765-496-6443
;
Tel: +1 765-494-5624
b
School of Agricultural and Biological Engineering and Bindley Bioscience Center, Purdue University, Indiana, USA
c
Biosciences Division, Oak Ridge National Laboratory, Tennessee, USA