الفهرس 
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Abstract
In today’s age of molecular biology purines and pyrimidines are best known as the basic constituents of the nucleic acids. Any elucidation of metal ions effects on the pyrimidine nucleus could possibly lead to a better understanding to compplex biological processes occuming in living system. DNA strands can curt up to produce some amazing structures, and they can bind to metal ions. DNA has served as an ingenious storage device for genetic data for more than three billion years. Buyt only few years ago, it has emerged as a powerful material for building complex structures at the nanometer scale.