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991.
Sreejarani?K.?Pillai Letlhogonolo?Matlhoko Chris?Arendse Suprakas?Sinha?Ray Mathew?Moodley 《Applied Physics A: Materials Science & Processing》2009,94(3):585-591
Multi-walled carbon nanotubes (MWCNTs) were synthesized a by chemical vapour deposition method. The effect of calcination
at temperatures ranging from 300 to 550°C in exposing the metal nanoparticles within the nanotube bundles was studied. The
degree of degradation of the structural integrity of the MWCNTs during the thermal process was studied by Raman spectroscopy,
X-ray diffraction analysis, field-emission scanning electron microscopy, and transmission electron microscopy. The thermal
behaviour of the as-prepared and calcined samples was investigated by thermogravimetric analysis. Calcination in air, at 400°C
for 1 h, was found to be an efficient and simple method to extract metallic impurities from the amorphous carbon shells with
minimal damage to the tube walls and lengths. The nanotubes were observed to be damaged at temperatures higher than 450°C. 相似文献
992.
Ruibin Li Ren'an Wu Minghuo Wu Hanfa Zou Hong Ma Ling Yang X. Chris Le 《Electrophoresis》2009,30(11):1906-1912
Oxidized single‐walled carbon nanotubes (o‐SWNTs) were employed as the drug carriers to deliver the small molecules of Rhodamine123 (Rho123) into the K562 cells via physical adsorption. However, due to the fluorescence quenching of Rho123 on carbon nanotubes, the quantitative determination of Rho123 in cells is difficult. Based on the MEKC coupled with LIF detection, a quantitative approach was developed for the determination of Rho123 delivered into K562 cells by o‐SWNTs. Where the adsorbed Rho123 on o‐SWNTs could be desorbed by SDS in running buffer and be simultaneously separated with o‐SWNTs due to the differences of their electrophoretic mobility by applying the electric potential at the both ends of capillary. Using this approach, the intracellular uptakes of Rho123 in multidrug‐resistant and multidrug‐sensitive leukemia cells were quantified, and the results showed that o‐SWNTs could be used as the potential drug carriers to deliver small molecules into cells via the physical adsorption along with the circumventing of multidrug resistance of leukemia cells. 相似文献
993.
Saskia Wolf Dipl.‐Chem. Tanja Zismann Dipl.‐Chem. Nathalie Lunau Dipl.‐Chem. Chris Meier Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(31):7656-7664
A reliable and high yielding synthetic pathway for the synthesis of the biologically highly important class of nucleoside diphosphate sugars (NDP‐sugars) was developed by using various cycloSal‐nucleotides 1 and 9 as active ester building blocks. The reaction with anomerically pure pyranosyl‐1‐phosphates 2 led to the target NDP‐sugars 20 – 45 in a nucleophilic displacement reaction, which cleaves the cycloSal moiety in anomerically pure forms. As nucleosides cytidine, uridine, thymidine, adenosine, 2′‐deoxy‐guanosine and 2′,3′‐dideoxy‐2′,3′‐didehydrothymidine were used while the phosphates of D ‐glucose, D ‐galactose, D ‐mannose, D ‐NAc‐glucosamine, D ‐NAc‐galactosamine, D ‐fucose, L ‐fucose as well as 6‐deoxy‐D ‐gulose were introduced. 相似文献
994.
Herbert A. Früchtl Dr. Tanja van Mourik Dr. Chris J. Pickard Dr. J. Derek Woollins Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2687-2692
A riddle solved! Despite its simple formula, the structure of the (SCN)x polymer has remained elusive since its first synthesis in 1929. From energetics as well as NMR chemical shifts, based on DFT calculations, we have strong evidence that it is indeed a tangle of linear chains, made up from N‐linked S2C2N five‐membered rings.
995.
Honora K. Smith Paul R. Harper Chris N. Potts Ann Thyle 《European Journal of Operational Research》2009
In this research, we consider the planning of community health schemes by non-governmental or faith-based organisations in rural areas of developing countries, from both top-down and ground level viewpoints. We conclude that both types of planning approach are valid and necessary for sustainability of such developments. With top-down planning in mind, we describe our hierarchical models especially designed for location of community health facilities, with objectives pertaining to both efficiency and equity of provision. As an additional case study, we present modelling of the location of a maximal number of self-sustainable primary healthcare workers in a rural region of India. 相似文献
996.
Chris S.K. Mak Qing Yun Leung Wai Kin Chan Aleksandra B. Djuriši? 《Journal of organometallic chemistry》2009,694(17):2770-2776
A series of sublimable substituted chlorotricarbonyl bis(phenylimino)acenaphthene rhenium(I) complexes was synthesized and used in the fabrication of photovoltaic devices. The hole and electron carrier mobilities of these complexes are in the order of 10−3 to 10−4 cm2 V−1 s−1. Heterojunction devices with CuPc/complex/C60 (CuPc = copper phthalocyanine) as the active layer and bulk heterojunction devices with complex:C60 as the active layer were fabricated. The rhenium complexes function as photosensitizer in the devices, and exhibit optical absorption in the region between 500 and 550 nm within which other components in the device do not absorb. Other devices with hole transport materials, exciton blocking materials, and different active layer thickness were also fabricated. Variation of substitution groups in the ligand did not show significant difference in device performance. The best power conversion efficiency of the devices was measured to be 1.29% under illumination of AM1.5 simulated solar light. 相似文献
997.
998.
999.
Choi KY Matsuda YH Nojiri H Kortz U Hussain F Stowe AC Ramsey C Dalal NS 《Physical review letters》2006,96(10):107202
We report pulsed field magnetization and ESR experiments on a {Cu3} nanomagnet, where antiferromagnetically coupled Cu(2+) (S = 1/2) ions form a slightly distorted triangle. The remarkable feature is the observation of a half step magnetization, hysteresis loops, and an asymmetric magnetization between a positive and a negative field in a fast sweeping external field. This is attributed to an adiabatic change of magnetization. The energy levels determined by ESR unveil that the different mixing nature of a spin chirality of a total S = 1/2 Kramers doublet by virtue of Dzyaloshinskii-Moriya interactions is decisive for inducing half step magnetization. 相似文献
1000.
In this rapid communication we describe an exciting platform technology that promises to fundamentally address two underlying
constraints of modern assays and immunoassays, namely sensitivity and rapidity. By combining the use of Metal-enhanced Fluorescence
(MEF) with low power microwave heating (Mw), we can significantly increase the sensitivity of surface assays as well as >95%
kinetically complete the assay within a few seconds. This technology is subsequently likely to find significant importance
in certain clinical assays, such as in the clinical assessment of myoglobin, where both the assay rapidity and sensitivity
are paramount for the assessment and treatment of acute myocardial infarction. 相似文献