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51.
The chemistry of saccharides has emerged as a new subarea of pharmaceuticals. Condensation reactions of D‐gluconic acid with [M(en)2]Cl2/[M(ea)2]Cl2 where M=Cu, Ni, en=ethylenediamine, and ea=ethanolamine were carried out and a new series of chiral complexes have been isolated and characterized. Molar conductance measurements show that the complexes are ionic, and the spectral data are indicative of octahedral geometry of the complexes [Cu(D‐GlcCO2H en*)2 (H2O)2] · Cl2 (1b), [Cu(D‐GlcCO2H ea*) (H2O)2] · Cl2 (3b) and [Ni(D‐GlcCO2H ea*) (H2O)2] · Cl2 (4), and the square planar geometry of complex [Ni(D‐GlcCO2H en*)2] · Cl2 (2b). Polarimetric data along with CD spectra establish the chiral nature of complexes. Solution stabilities of these complexes were evaluated by cyclic voltammetric techniques as a function of pH. Electrochemical behavior of the complexes was studied in aqueous solution and showed an irreversible CuII/CuI couple. Kinetic studies of complex 1b and 3b with calf thymus DNA have been investigated spectrophotometrically under pseudo‐first order conditions, and k obs values have been evaluated. Circular dichroism, cyclic voltammetry determinations, and viscosity measurements have also been carried out to authenticate the binding of DNA with metal complexes. Complexes 1b and 3b bind to DNA by covalent bond formation. 相似文献
52.
MK Bhide RM Kadam MD Sastry Ajay Singh Shashwati Sen Manmeet Kaur DK Aswal SK Gupta VC Sahni 《Pramana》2002,58(5-6):799-802
Microwave absorption studies have been carried out on MgB2 superconductor using a standard X-band EPR spectrometer. The modulated low-field microwave absorption signals recorded for
polycrystalline (grain size ∼ 10 μm) samples suggested the absence of weak-link character. The field dependent direct microwave
absorption has been found to obey a ✓H dependence with two different slopes, which indicated a transition from strongly pinned lattice to flux flow regime. 相似文献
53.
Epitaxial La1−x
Pb
x
MnO3 (LPMO) thin films, grown on (100) SrTiO3 substrates by laser ablation technique at different temperatures between 600 and 850°C, have been characterized for electrical
and magnetic properties. The temperature dependence of resistivity showed that the metal-insulator transition temperature
(T
MI) decreases with increasing substrate temperature, which has been attributed to decrease in Pb content in the filsm. The YBa2Cu3O
x
/La1−x
MnO3 heterostructures, exhibiting both superconductivity and ferromagnetism, have been fabricated. 相似文献
54.
The fcc Ising model with nearest-neighbour ferromagnetic interactions has been studied using the Monte-Carlo renormalization group method of Swendsen. The values of the exponents found are consistent with those determined from series analysis and ?-expansions. 相似文献
55.
In simultaneous equation theory a sample is said to be undersized when it is smaller than the number of exogenous variables. The sample moment matrix of these variables is then singular, but equations can nevertheless be estimated when different moments (hybrid moments based on the Theil-Laitinen maximum entropy distribution) are used. Here we evaluate the adequacy of the asymptotic standard errors formulated in terms of such moments. 相似文献
56.
Arjmand F Sharma GC Sayeed F Muddassir M Tabassum S 《Journal of photochemistry and photobiology. B, Biology》2011,105(3):167-174
N,N-bis[(R-/S-)-1-benzyl-2-ethoxyethane] tin (IV) complexes were synthesized by applying de novo design strategy by the condensation reaction of (R-/S-)2-amino-2-phenylethanol and dibromoethane in presence of dimethyltin dichloride and thoroughly characterized by elemental analysis, conductivity measurements, IR, ESI-MS, (1)H, (13)C and (119)Sn, multinuclear NMR spectroscopy and XRD study. Enantioselective and specific binding profile of R-enantiomer 1 in comparison to S-enantiomer 2 with ultimate molecular target CT-DNA was validated by UV-visible, fluorescence, circular dichroism, (1)H and (31)P NMR techniques. This was further corroborated well by interaction of 1 and 2 with 5'-GMP. 相似文献
57.
Sartaj Tabassum Rais Ahmad Khan Subrata Sen Aarti S. Juvekar 《Journal of organometallic chemistry》2011,696(8):1600-2895
New glycosyl derived ligand and its complexes, with SnCl4·5H2O (1) and (CH3)2SnCl2(2) were synthesized and characterized by spectroscopic (IR, 1H, 13C, and 119Sn NMR, UV-vis, ESI-MS) and analytical methods. Interaction studies of 1 and 2 with CT DNA were studied by using various biophysical techniques, which showed high binding affinity of 2 with CT DNA. In vitro cytotoxicity of complexes 1 and 2 were evaluated against different human cancer cell lines of different histological origins by employing SRB Assay. The organotin(IV) complex 2 exhibited remarkable activity against DWD (oral cancer) cell lines with GI50 values <10 μg/ml. Complex 2 induced apoptosis of DWD cell line at a very low concentration of 1-4 μg/mL. 相似文献
58.
Sartaj Tabassum Waddhaah M. Al–Asbahy Mohd. Afzal Manal shamsi Farukh Arjmand 《Journal of luminescence》2012,132(11):3058-3065
Synthesis, characterization, DNA binding and cleavage studies of [Zn(glygly)(ssz)(H2O)]·6H2O (1) containing glycyl glycine and sulfasalazine ligand. Complex 1 recognize minor groove of DNA and show hydrolytic DNA cleavage.Highlights? Novel Zn(II) complex 1 bearing bioactive glycyl glycine and sulfasalazine ligand scaffold. ? Cleavage activity of 1 was enhanced in presence of activators: H2O2>MPA>GSH>Asc. ? Complex 1 recognize minor groove as depicted in the cleavage pattern and molecular docking. ? Complex 1 cleaves pBR322 DNA via hydrolytic mechanism and validated by T4 DNA ligase experiments. 相似文献
59.
60.
Varun Sahni 《Pramana》1999,53(6):995-1000