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排序方式: 共有88条查询结果,搜索用时 15 毫秒
1.
Thyagarajan S Shay DT Incarvito CD Rheingold AL Theopold KH 《Journal of the American Chemical Society》2003,125(15):4440-4441
Reaction of TpR,MeCo(I) dinitrogen complexes (R = iPr, tBu) with trimethylsilyl azide yields structurally characterized compounds that imply the formation of reactive intermediates of the type TpR,MeCo=NSiMe3. These cobalt imido species apparently abstract hydrogen from the 3-substituent of the Tp-ligand, leading to the formation of amido complexes accompanied by either Co-C bond formation (R = tBu) or C-C bond formation (R = iPr). 相似文献
2.
Adva Mechaly Noam Cohen Shay Weiss Eran Zahavy 《Analytical and bioanalytical chemistry》2013,405(12):3965-3972
Amplified Luminescent Proximity Homogeneous Assay (AlphaLISA) technology is an energy-transfer-based assay, utilizing singlet oxygen as an energy donor to a fluorescent acceptor. The long singlet oxygen migration distance allows the energy transfer mechanism to go up to ~200 nm, facilitating flexible and sensitive homogeneous immunoassays. While soluble protein detection using AlphaLISA was previously described, the detection of particles such as bacteria and viruses was not reported. In this work, we show for the first time the implementation of the AlphaLISA technology for the detection of a particulate antigen, i.e., Bacillus anthracis spores. Here, we show that an efficient particle immunoassay requires a high acceptor-to-donor ratio (>4:1). The results suggested that the high acceptor/donor ratio is required to avoid donor aggregation (“islands”) on the spore surface, hence facilitating donor/acceptor interaction. The developed assay enabled the detection of 106 spores/mL spiked in PBS. We also demonstrate the development of a highly sensitive AlphaLISA assay for the detection of the main toxin component of anthrax, protective antigen (PA). The assay enabled the detection of 10 and 100 pg/mL PA in buffer and spiked naïve rabbit sera, respectively, and was successfully implemented in sera of anthrax-infected rabbits. To summarize, this study demonstrates that AlphaLISA enables detection of anthrax spores and toxin, utilizing short homogeneous assays. Moreover, it is shown for the first time that this technology facilitates the detection of particulate entities and might be suitable for the detection of other bacteria or viruses. 相似文献
3.
Regen SL Janout V Stedronsky ER Zhang Lh Blum JS Boyajian AR Butow ME Carbonelli KL Liebentritt S Rouse RK Shay DT Vincent GA Warholic HM Yanagisawa H 《Organic letters》2000,2(14):2157-2160
The use of partially quaternized, chloromethylated polystyrene as a covalent scavenger of cholate ion in aqueous media has been demonstrated. The ability of such polymers to scavenge organic anions by covalent as well as by ionic means has important implications in the areas of medicinal and environmental chemistry, which are briefly discussed. 相似文献
4.
Yeh S. Loughlin D.H. Shay C. Gage C. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2006,94(10):1838-1851
This paper presents an analysis of the potential system-wide energy and air emissions implications of hydrogen fuel cell vehicle (H 2-FCV) penetration into the U.S. light duty vehicle (LDV) fleet. The analysis uses the U.S. EPA MARKet ALlocation (MARKAL) technology database and model to simultaneously consider competition among alternative technologies and fuels, with a focus on the transportation and the electric sectors. Our modeled reference case suggests that economics alone would not yield H2-FCV penetration by 2030. A parametric sensitivity analysis shows that H2-FCV can become economically viable through reductions in H 2-FCV costs, increases in the costs of competing vehicle technologies, and increases in oil prices. Alternative scenarios leading to H2-FCV penetration are shown to result in very different patterns of total system energy usage depending on the conditions driving H2-FCV penetration. Overall, the model suggests that total CO2 emissions changes are complex, but that CO2 emission levels tend to decrease slightly with H2-FCV penetration. While carbon capture and sequestration technologies with H 2 production and renewable technologies for H2 production have the potential to achieve greater CO2 reductions, these technologies are not economically competitive within our modeling time frame without additional drivers 相似文献
5.
W.C. Dautremont-Smith L.M. Schiavone S. Hackwood G. Beni J.L. Shay 《Solid State Ionics》1981,2(1):13-18
We report the fabrication and electrochromic behavior of iridium oxide film electrodes, including a specific display electrode design compatible with the high peak ion-insertion current densities accepted by this material and necessary for the shortest possible response time. The configuration of a complete two-terminal display cell, in which the high capacity counter electrode behaves as a pseudo-reference electrode, is presented. Cell performance, including the use of IR compensated constant-voltage address when response time is limited by impedances external to the iridium oxide itself, is reported. 相似文献
6.
The nature of collisionless reconnection in a three-species plasma composed of a heavy species, protons, and electrons is examined. In addition to the usual two length scales present in two-species reconnection, there are two additional larger length scales in the system: one associated with a "heavy whistler" which produces a large scale quadrupolar out-of-plane magnetic field, and one associated with the "heavy Alfvén" wave which can slow the outflow speed and thus the reconnection rate. The consequences for reconnection with O+ present in the magnetotail are discussed. 相似文献
7.
Markus Levy Shay GAL-ON 《今日电子》2007,(4):50-51
随着嵌入式系统在消费电子和工业设备中的广泛应用,功耗已经开始像时钟速度和系统性能一样成为微处理器的一个核心特性.为了确定各种微处理器的功耗效率,嵌入式微处理器基准协会开发了一个有力的工具--EnergyBench. 相似文献
8.
S.S. Harilal B. O’Shay Y. Tao M.S. Tillack 《Applied physics. B, Lasers and optics》2007,86(3):547-553
Mitigation of energetic ions from laser produced tin plasma is one of the principal issues in the development of an extreme
ultraviolet lithographic light source. We explored the possibility of using an ambient gas and/or a magnetic field for controlling
the energetic ions from tin plasma. Hydrogen, helium and argon gases provide good transmission to 13.5 nm and are found to
be an effective stopper for tin ions. Absorption of in-band radiation limits the density of gas below levels needed to completely
protect optics. Tin ion ranges in buffer gases were estimated using the Monte Carlo simulation code SRIM and compared with
experimental results. The presence of a moderate transverse magnetic field of 0.64 T slowed the propagation of fast moving
tin ions but failed to stop them. The synergistic effect of a combination of magnetic field and an ambient gas is found to
be very promising for mitigating tin ions without exceeding EUV gas absorption limits.
PACS 42.72.Bj; 52.50.Jm; 52.55.Jd; 52.70.kz 相似文献
9.
The high-velocity regime of mode-I fracture is interesting, especially because of the instability of the steady-state propagating crack to a more complex dynamics (such as micro-branching). In this article, we study mode-I fracture in a non-linear lattice in the absence of a viscous force. In earlier study, we had studied the effects of the bond potential parameters, including Kelvin viscous force, on the macroscopic behavior of the crack, including the high velocity regime instability. Recently, a new study has appeared using a very similar non-linear force but claiming quite different results. In this article, we seek to discover an explanation of these differences. We find that they do not result from the viscosity present in our previous study. At least part of the differences are attributable, rather, to the very wide system used in the recent study, which leads to long transients and a failure to probe the steady-state behavior. Our results confirm our previously claimed lack of agreement with the Yoffe prediction for the critical velocity of a steady-state crack, and neither do they match the predictions of Gao’s model. 相似文献
10.
In the past several years much attention has been placed on improving the motion picture quality of liquid crystal displays (LCDs). One pervasive problem is motion blur which occurs due to the inherent sample-and-hold nature of LCD image formation. In this work, we take a signal processing approach to motion blur reduction by pre-processing the data before it is sent to the display. We develop a two-channel non-perfect reconstruction filter bank that is able to reduce the amount of perceivable motion blur. In addition, as in similar works, we discriminate between different regions of the scene and weight the application of the algorithm based on their susceptibility to motion blur. Perceptual tests indicate that our algorithm reduces the amount of perceivable motion blur on LCDs. 相似文献