Speaker
Mr
Philippe Alexandre Divna Petersen
(Universidade de São Paulo)
Description
Hyperfine interactions can be a powerful tool to identify local environments in many different systems. Recently it has been drawn attention to the possible application of the Time Differential Perturbed Angular Correlation (TDPAC) technique to study differences in the Nuclear Quadrupole Coupling constants ( υQ ) at Cd probes in mouse DNA infected with the Trypanosoma Cruzi. The electric contribution to the hyperfine interaction is usually expressed as the nuclear quadrupole coupling frequency υQ which is given by the product of the nuclear quadrupole moment Q and the Electric Field Gradient (EFG) at the nucleus. The EFG can be theoretically obtained from an ab initio electronic structure calculation. The 111In → 111Cd β decay can be used in a TDPAC measurement to investigate the Cd metal binding to DNA. The interaction of the metal with the DNA bases can change many aspects of the base pairing [1]. Here we study electric hyperfine properties of Cd bound to some DNA bases. The methodology used for the electronic structure calculations is based on the Kohn Sham [2] scheme of the Density Functional Theory (DFT) and the Car-Parrinello [3] method. We use the Projector Augmented Wave [4] method as embodied in the (CP-PAW) computational code. The results of EFG and energies are discussed as function of water molecules present in the Cd²+ environment and compared with TDPAC measurements at Cd probes in mouse DNA infected with the Trypanosoma Cruzi.References [1] J. V. Burda, J. Sponer, J. Leszczynski, P. Hobza, J. Phys. Chem. B., 101, 9670 (1997). [2] W. Kohn, L. J. Sham, Phys. Rev. B., 140, 1133 (1965).[3] P. E. Blöchl, Phys. Rev. B., 50, 17953 (1994).[4] R. Car e M. Parrinello, Phys. Rev. Lett. 55, 2493 (1985).
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Primary author
Mr
Philippe Alexandre Divna Petersen
(Universidade de São Paulo)
Co-authors
Ms
Andreia dos Santos Silva
(Instituto de Pesquisas Energéticas e Nucleares - IPEN)
Dr
André Luis Lapolli
(Instituto de Pesquisas Energéticas e Nucleares - IPEN)
Prof.
Artur Wilson Carbonari
(Instituto de Pesquisas Energéticas e Nucleares - IPEN)
Prof.
Helena Maria Petrilli
(Universidade de São Paulo - USP)
Mr
Marcos Brown Gonçalves
(Universidade de São Paulo - USP)
