1. Assoc. Prof., Biol. and Agric. Engrg. Dept., Univ. of California, Davis, Davis, CA 95616. E-mail: dcslaughter@ucdavis.edu
2. Prof., Biol. and Agric. Engrg. Dept., Univ. of California, Davis, Davis, CA.
3. Consultant and Former Grad. Student, Biol. and Agric. Engrg. Dept., Univ. of California, Davis, Davis, CA.