نتایج جستجو برای: پایه ریس py
تعداد نتایج: 56705 فیلتر نتایج به سال:
A mononuclear complex [MoOCl4(H2O)] readily forms a metal−metal bonded {Mo2O4} core. A high content of pyridine in the reaction mixture prevents further aggregation of dinuclear cores into larger clusters and a neutral, dinuclear complex with the [Mo2O4Cl2(Py)4] composition is isolated as a product. Solid state structures of two compounds containing this complex, [Mo2O4Cl2(Py)4]·2.25Py (1) and ...
g-قاب ها، یک رده وسیع تر و در برگیرنده قاب های زیر فضایی، شبه قاب ها، قاب های گسسته و... هستند، در نتیجه مطالعه g-قاب ها و خواص شان ازاهمیت ویژه ای برخوردار است. معادل هایی برای g-قاب ها بیان نموده و نشان می دهیم g-قاب ها در بسیاری از خواص با قاب ها شریک هستند. همچنین مفهوم پایه های ریس و متعامد یکه را گسترش می دهیم. به هر g-قاب معمولی یک قاب نظیر می گردد که بسیاری از ویژگی های آن را متصور می ...
A furan amino acid, inspired by the recently discovered proximicin natural products, was incorporated into the scaffold of a DNA-binding hairpin polyamide. While unpaired oligomers of 2,4-disubstituted furan amino acids show poor DNA-binding activity, furan (Fn) carboxamides paired with N-methylpyrrole (Py) and N-methylimidazole (Im) rings demonstrate excellent stabilization of duplex DNA as we...
Reaction of [Ir(COD)(py-I(t)Bu)](+) (py-I(t)Bu = 3-tert-butyl-1-picolylimidazol-2-ylidene) with acetonitrile results in reversible intramolecular C-H bond activation of the NHC ligand and formation of [Ir(η(2):η(1)-C8H13)(py-I(t)Bu')(NCMe)](+). Coordinated COD acts as an internal hydride acceptor and acetonitrile coordination offsets the otherwise unfavourable thermodynamics of the process.
Four novel polymeric metal complexes with a D–A–π–A motif, BDTT-PY-Cd, BDTT-PY-Zn, BDTT-PY-Cu and BDTT-PY-Ni, were designed, synthesized characterized. These made up Cd(II), Zn(II), Cu(II), Ni(II) complexes, thienylbenzo-[1,2-b:4,5-b'] dithiophene (BDTT) the 8-quinolinol derivative, which used severally as dye sensitzers’ auxiliary electron acceptors (A), donor (D) π bridges well (A). Under AM ...
During 2000 to 2009, data on people undergoing HIV testing and on those newly diagnosed with HIV were collected in a network of 20 Spanish clinics specialising in sexually transmitted infections and/or HIV testing and counselling. The number of tests performed, overall and disaggregated by different variables, was obtained. HIV prevalence among first-time testers and HIV incidence among repeat ...
The treatment of [1,1-(PR3 )2 -3-(Py)-closo-1,2-RhSB9 H8 ] (PR3 =PMe3 (2) or PPh3 and PMe3 (3); Py=pyridine) with triflic acid (TfOH) affords [1,3-μ-(H)-1,1-(PR3 )2 -3-(Py)-1,2-RhSB9 H8 ](+) (PR3 =PMe3 (4) or PMe3 and PPh3 (5)). These products result from the protonation of the 11-vertex closo-cages along the Rh(1)B(3) edge. These unusual cationic rhodathiaboranes are stable in solution and in...
PURPOSE Constitutive activation of signal transducer and activator of transcription 3 (Stat3) protein has been observed in a wide variety of tumors, including breast cancer, and contributes to oncogenesis at least in part by prevention of apoptosis. In a study of 45 patients with high-risk breast cancer enrolled in a phase II neoadjuvant chemotherapy trial with docetaxel and doxorubicin, we eva...
Cell nuclei are like gated communities—quite selective about who gets in. And understandably so, because if the wrong proteins showed up at the wrong time and place, the consequences could be disastrous. The standard procedure for moving large molecules that cannot diffuse from the cytoplasm into the nucleus is to use the transport proteins known as karyopherins as escorts. How do karyopherins ...
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