In this study, we present the work on the physicochemical interaction between the anti-cancer alkaloidberberine (BRB) and DNA with the purpose of designing drugs that interact more with DNA. Molecularmodeling on the complex formed between berberine and DNA presented that this complex was undeniablyfully able of participating in the formation of a stable intercalation site. Besides, the molecular geometries ofberberine and the DNA bases (Adenine, Guanine, Cytosine and Thymine) were optimized with the aid of theB3LYP/6-31G method. This intercalator has a large polarizability and is a good electron acceptor, while basepairs are good electron donors. B3LYP/6-31G stabilization energies of intercalator… DNA base paircomplexes are large (-7.65 kcal/mol for AT···BRB and -3.58 kcal/mol for GC···BRB). It was eventuallyconcluded that the dispersion energy and the electrostatic interaction influenced the stability of theintercalator···DNA base pair complexes. The results exhibited that the BRB changes affected the DNAstructure with reference to the bond length, the bond angle, the torsion angle and the charges. پرونده مقاله

In this study, Taguchi experimental design has been used for the optimization of thickness of chromium layers. For this purpose brass materials have been electroplated under various conditions of the process. An orthogonal array (OA) was employed to analyze the effect of plating parameters on the characteristic of the thickness. Variables which were considered for working were as following; amount of chromic acid, amount of sulfuric acid, time, and current density. Eventually, the obtained results revealed that among the influential parameters in the process, only current density of 6A/dm2 and time of 4 minutes have the most effect on the enhancement of the thickness. پرونده مقاله