**Mechanisms of Mutagenic DNA Nucleobase Damages and Their Chemical and Enzymatic Repairs Investigated by Quantum Chemical Methods**

Eric A. C. Bushnell1, Jorge Llano2, Leif A. Eriksson3 and James W. Gauld1 *1University of Windsor, Department of Chemistry and Biochemistry, Windsor, Ontario 2Grant MacEwan University, Department of Physical Sciences, Edmonton, Alberta 3School of Chemistry, National University of Ireland, Galway 1,2Canada 3Ireland* 
