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Abstract
Targeted message theoretical studies and practical rules of the modified nucleic acids and included 3 chapters: -
1 - an overview and passing on the rules of nucleic acids and the previous work conducted by
2 - accounts of quantum chemistry and used in the problems of a chemical Dhuohmip < br> 3 - Presentation and discussion of results obtained by the researcher and by offering original and amended Aljura_il then Iiuyorassel with substituents and also the results of Alberton, in addition to the expected locations of the rules and also display the results in the case of aqueous solution.