1. Department of Physical Chemistry, University of Pannonia, H-8201 Veszprém, P.O. Box 158, Hungary
2. Department of Molecular Biophysics and Physiology, Rush University Medical Center, Chicago, Illinois 60612, and Department of Physical Chemistry, University of Pannonia, H-8201 Veszprém, P.O. Box 158, Hungary
3. Department of Molecular Biophysics and Physiology, Rush University Medical Center, Chicago, Illinois 60612