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The interactions of two organoplatinum complexes, [Pt(C^N)Cl(dppa)], 1, and [Pt(C^N)Cl(dppm)], 2 (C^N = N(1), C(2')-chelated, deprotonated 2-phenylpyridine, dppa = bis(diphenylphosphino)amine, dppm = bis(diphenylphosphino)methane), as antitumor agents, with bovine serum albumin (BSA) and human serum albumin (HSA) have been studied by fluorescence and UV-vis(More)
A novel approach for the use of external memory in ant colony optimization strategy for solving descriptor selection problem in quantitative structure-activity/property relationship studies is described. In this approach, several ant colony system algorithms are run to build an external memory containing a number of elite ants. In the next step, all of the(More)
A quantitative structure activity relationship study has been applied to a data set of 18 sulfa drugs with carcinogenesis activity. Semi-empirical quantum chemical calculation (AM1 method) was used to find the optimum 3D geometry of the studied molecules. Two types of molecular descriptors including chemical and electronic was used to derive a quantitative(More)
Multidrug resistance (MDR) is defined as resistance of tumor cells to the cytotoxic action of multiple structurally dissimilar and functionally divergent drugs commonly used in chemotherapy. Until now, there is no evidence for the effect of 1,4-dihydropyridines (DHPs) on atypical MDR, although there are some indications about the effect of DHPs on(More)
The Hansch analysis method was applied to a series of recently synthesized nifedipine analogues containing nitroimidazolyl, phenylimidazolyl, and methylsulphonylimidazolyl groups at the C-4 position and different ester substituents at C-3 and C-5 positions of the dihydropyridine ring. Hydrophobic, electronic, inductive, and resonance substituent constants(More)
A group of dialkyl and diarylester analogues of nifedipine, in which the ortho-nitrophenyl group at position 4 was replaced by a 1-methyl-4,5-dichloroimidazolyl substituent, were synthesized and evaluated as calcium-channel antagonists using the high K(+)concentration of guinea-pig ileum longitudinal smooth muscle. The structure of all compounds was(More)
A QSAR algorithm, principal component-genetic algorithm-artificial neural network (PC-GA-ANN), has been applied to a set of newly synthesized calcium channel blockers, which are of special interest because of their role in cardiac diseases. A data set of 124 1,4-dihydropyridines bearing different ester substituents at the C-3 and C-5 positions of the(More)
The interaction of amodiaquine (AQ) with human serum albumin (HSA) has been studied by fluorescence spectroscopy. Based on the sign and magnitude of the enthalpy and entropy changes (ΔH(0) = -43.27 kJ mol(-1) and ΔS(0) = -50.03 J mol(-1) K(-1)), hydrogen bond and van der Waals forces were suggested as the main interacting forces. Moreover, the efficiency of(More)
The interaction between harmalol and human serum albumin (HSA) has been studied by fluorescence spectroscopy and molecular modeling methods. The intrinsic fluorescence of HSA was quenched by harmalol, which was rationalized in terms of the static quenching mechanism. The binding parameters, quenching constants and conformation changes were determined by(More)
In view of obtaining some potential antibacterial compounds, we have described synthesis of some chloroaryloxyalkyl imidazole and benzimidazole derivatives. The relevant step in the synthetic sequence was the initial condensation of 4-chloro or 2,4-dichlorophenol with 1, n-dibromoalkanes (n=2, 4, 5) to provide compounds 3a-f in sufficient yields. The(More)