Navegando por Assunto "Quantum dots"

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Acesso aberto (Open Access)
Interações de Quantum Dot com estruturas externas de vírus Nipah utilizando docking e dinâmica molecular
(Universidade Federal do Pará, 2023-01-30) ALMEIDA, Aguinaldo Pantoja de; OLIVEIRA, Mozaniel Santana de; http://lattes.cnpq.br/0810227136654245; HTTPS://ORCID.ORG/0000-0002-4076-2443; CHAVES NETO, Antônio Maia de Jesus; http://lattes.cnpq.br/3507474637884699; https://orcid.org/0000-0002-9730-3512
Performing the interaction of the outermost protein of the Nipah virus with fourteen structures with possible potential for the emission of quantum dots, using anchoring and molecular dynamics, using molecular docking platforms: CB Docking, Swiss DOCK, AutoDock Vina 4.2.6 to perform a comparison of results explaining the best values, in addition to using Gromacs 2022 to make ligand trajectories in relation to time. The mostly hydrophobic complexes at the receptor binding site. The tolerance energy results tolerated the partial loads of the tips which showed better stability, the RMSD results also respected this premise. Thus, the set formed by combining proteins with a quantum dot has the potential to more efficiently adsorbing of the protein components of the virus. Molecular dynamics and docking studies and verification of binding energy revealed strong and stable binding between para QD K and QD-G and QD-F with the macrostructure of NIPAH virus. It was established in the docking studies, that the binders have emission energy scores of -13,658 kcal/mol, -13.6 kcal/mol, -13.9 kcal/mol, for K, G and F respectively. The same result was applied in the Gibbs free energy verification study with values for F of 239.00 kcal/mol, G of 246.65 kcal/mol and K of 259.52 kcal/mol.
Acesso aberto (Open Access)
Transporte eletrônico entre nanopartículas metálicas
(Universidade Federal do Pará, 2019-10-11) SILVA, Júlio César Reis da; DEL NERO, Jordan; http://lattes.cnpq.br/5168545718455899
One of the great challenges of today is the effective manipulation of electronics at the nanoscale. This idea was initiated by Aviram and Ratner in 1974 in the creation of a unimolecular rectifier diode. Since then, important investigations have been emphasized in theoretical modeling of electronic transport, in order to study the dependence relationship of the structure of the molecular bridge with the electronic properties of the connections made with the electrodes, and in this way to build an electronic device functional. Thus, the research work carried out a theoretical study of the electron properties in single-molecule Au junctions, subjected to variations of molecular and quantum dots, through analysis of the characteristic curves of Current-Voltage, Differential Condutance-Voltage, Transmittance - Energy and Voltage, Density of the Device States as a function of Energy and Autochannels of Conduction. For that, the Density Functional Theory was combined with the Green Function of Non-Equilibrium via free Siesta and Transiesta software packages. The results indicate the presence of many interlacings of regions of electronic transport probabilities, mainly generating changes with those that have quantum dots. Finally, these electronic devices of Au presented several indications for other researches with other types of materials involved in the same central ideas of change of geometry with moleculares bridges and quantum dots for the control of loads and generation of new phenomena.