1. Department of BiologyUtah State University, Logan Utah 84322-5305 U.S.A
2. Department of Chemistry and BiochemistryUtah State University Logan, Utah 84322-0300 U.S.A
3. Department of Biological EngineeringUtah State University Logan, Utah 843122 U.S.A
4. Department of BiologyUtah State University Logan, Utah 84322-5305 U.S.A