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排序方式: 共有347条查询结果,搜索用时 15 毫秒
341.
Rahul Tyagi Mukesh K. Pandey Shashwat Malhotra Rajesh Kumar Jayant Kumar Virinder S. Parmar 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(12):1283-1287
We have synthesized light sensitive nano micelles for their applications as drug delivery agents. Various azo compounds having different dipole moment values have been covalently attached to an amphiphilic pegylated co‐polymer and their light sensitive behavior has been studied in both aqueous and organic media with ultra violet light to understand the light dependent supramolecular organization. 相似文献
342.
Abstract Ultrasonic (70 W, 20 kHz) solution (2% THF) degradations of polystyrene (PS), poly(α-methylstyrene) (PαMeS), poly(p-isopropyl α-methylstyrene) (PpiPrαMeS), poly(p-chlorostyrene) (PpCIS), poly(p-bromostyrene) (PpBrS), and poly(p-methoxystyrene) (PpOMeS) have been carried out in tetrahydrofuran at 27° C. The average number of chain scissions S (where S = [(M n)0/(M n)t] - 1), computed from the overall values of [(M n)0 and (M n)t, were found to be different from those of S' (where S' = α([(M n)0/(M n)t] - 1)) based on the component (only that part of the polymer which is involved in degradation) data of the weight fraction (α), (M n)0, and (M n)t), S' for polystyrene and substituted polystyrene follows the order PS gt; PpCIS gt; PpiPrαMeS gt; PpBrS gt; PpOMeS gt; PαMeS. In the case of PS where degradations were also carried out at -20°C, lowering of the temperature increased the weight fraction of polymer degraded as well as S. Based on the viscosity and GPC data, it is concluded that the ultrasonic solution degradation of PS does not lead to branched polymers. 相似文献
343.
Prof. Barry M. Trost Dr. Sushant Malhotra 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(27):8288-8292
A concise asymmetric synthesis of aminocyclitols, such as diastereomeric 2‐deoxystreptamine analogues and conduramine A, is described. The Pd‐catalyzed asymmetric desymmetrization of meso 1,4‐dibenzolate enables the synthesis of highly oxidized cyclohexane architectures. These scaffolds can potentially be used to access new aminoglycoside antibiotics and enantiomerically pure α‐glucosidase inhibitors. 相似文献
344.
Guizzunti G Brady TP Malhotra V Theodorakis EA 《Journal of the American Chemical Society》2006,128(13):4190-4191
The chemical origin of the norrisolide-induced irreversible Golgi vesiculation was studied using a variety of norrisolide probes. This natural product was found to bind to a receptor on the Golgi membranes using the perhydroindane core fragment as the recognition element. The acetylated gamma-lactol-gamma-lactone side chain of norrisolide is essential for the irreversible Golgi vesiculation and can be replaced by other electrophilic motifs without loss of biological function. In particular, compound 10 reproduces the cellular phenotype of the natural product. 相似文献
345.
Nanofluids, comprising Y2O3-stabilized (partially; 3?mol%) ZrO2 nanoparticles (up to 2?vol%) dispersed in water and ethylene glycol, were developed. A suitable surfactant and stirring routine ensured uniformity and stability of dispersion. Thermal conductivity ratio of the nanofluids, measured using an indigenously developed thermal comparator device, showed a significant increase of up to 100% with only 1.5?vol% nanoparticles. Furthermore, it was analytically shown that shape factor and aspect ratio significantly influence the effective thermal conductivity ratio of nanofluids with comparable vol% nanoparticles. The study demonstrated that a nanofluid of nano-ZrO2 dispersed in water and ethylene glycol could be usefully applied in closed-loop single-phase heat transfer conditions, such as in refrigerators or microchannels. 相似文献
346.
J. L. Bailly F. Bruyant B. Buschbeck C. Caso Y. Chiba H. Dibon F. J. Diez-Hedo B. Epp A. Ferrando F. Fontanelli S. N. Ganguli V. G. Gavrjusev P. Girtler R. Hamatsu P. Herquet T. Hirose J. Hrubec Y. Iga Yu. Ivanyshevkov L. Jenik N. Khalatyan E. Kistenev T. Kobayashi J. M. Kohli S. Krasznovszky V. Kubik J. MacNaughton P. K. Malhotra L. Montanet G. Neuhofer P. Porth T. Rodrigo J. M. Salicio J. B. Singh S. Squarcia K. Sudhakar K. Takahashi L. A. Tikhonova U. Trevisan T. Tsurugai G. Zholobov S. A. Zotkin EHS-RCBC Collaboration 《Zeitschrift fur Physik C Particles and Fields》1987,35(3):295-300
Using a quark-diquark fragmentation model, in which either the Field-Feynman or the Lund model is coupled with a quark-diquark distribution function, we study transverse momentum distributions,p T, for the inclusive reactionspp→hadron +anything at 360 GeV/c. We find that a primordial mean transverse momentum 〈k T〉?0.4 GeV/c can well reproduce thep T 2 distributions of charged hadrons, π0,K s 0 , Λ0,K * and Σ* and the Feynmanx?p T correlations. We confirm that a diquark in a proton plays an important rôle in reproducing thex?p T correlation of Λ0. 相似文献
347.