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91.
Ulyana Shimanovich Itai Dov Tkacz Dror Eliaz Artur Cavaco‐Paulo Shulamit Michaeli Aharon Gedanken 《Advanced functional materials》2011,21(19):3659-3666
RNA was encapsulated in bovine serum albumin (BSA) microspheres using a one‐step sonochemical process from an water–oil solvent biphasic system. Confocal microcoscopy and fluorescence‐activated cell sorting indicate that a CY3‐RNA (RNA labeled with red fluorescent indocarbocyanine Cy3 dye) sphere is encapsulated in the BSA outer sphere. The diameter of the sphere depends on the number of nucleotides of the RNA, ranging from 0.63 to 2.74 μm. Total RNA (t‐RNA) was used as a prototype for the future small interfering RNA (siRNA) delivery. A very broad size distribution characterizes the RNA spheres and therefore, among the loaded BSA spheres, there were sufficiently small spheres to be successfully introduced into trypanosoma brucei parasites and human osteosarcoma U2OS cancer cells. 相似文献
92.
Saketha Nath Jagarlapudi Aharon Ben-Tal Chiranjib Bhattacharyya 《Optimization and Engineering》2013,14(2):225-250
Chebyshev-inequality-based convex relaxations of Chance-Constrained Programs (CCPs) are shown to be useful for learning classifiers on massive datasets. In particular, an algorithm that integrates efficient clustering procedures and CCP approaches for computing classifiers on large datasets is proposed. The key idea is to identify high density regions or clusters from individual class conditional densities and then use a CCP formulation to learn a classifier on the clusters. The CCP formulation ensures that most of the data points in a cluster are correctly classified by employing a Chebyshev-inequality-based convex relaxation. This relaxation is heavily dependent on the second-order statistics. However, this formulation and in general such relaxations that depend on the second-order moments are susceptible to moment estimation errors. One of the contributions of the paper is to propose several formulations that are robust to such errors. In particular a generic way of making such formulations robust to moment estimation errors is illustrated using two novel confidence sets. An important contribution is to show that when either of the confidence sets is employed, for the special case of a spherical normal distribution of clusters, the robust variant of the formulation can be posed as a second-order cone program. Empirical results show that the robust formulations achieve accuracies comparable to that with true moments, even when moment estimates are erroneous. Results also illustrate the benefits of employing the proposed methodology for robust classification of large-scale datasets. 相似文献
93.
94.
Nina Perkas Ziyi Zhong Luwei Chen Michele Besson Aharon Gedanken 《Catalysis Letters》2005,103(1-2):9-14
Highly dispersed Ru nanoparticles on mesoporous TiO2 have been synthesized by a one-step ultrasound assisted polyol reduction procedure. The catalysts have been characterized by XRD, TEM and HR-TEM, EDX, BET and TPR methods. It has been demonstrated that the sonochemical method reduces the Ru+3 ions creating a narrow size distribution of metallic nanoparticles deposited on the mesoporous support without damaging its pore structure. The nanoparticles of Ru are highly dispersed and stable because of their incorporation into the mesopores, and the strong metal-support interaction. The catalytic properties of Ru/TiO2(MSP) have been tested in the partial oxidation of methane, and high activity and selectivity towards CO and H2 have been demonstrated. 相似文献
95.
This work presents the design, construction, and experimental testing of unique sensitive surface loop-gap microresonators for electron spin resonance (ESR) measurements. These resonators are made of "U"-shaped gold structures with typical sizes of 50 and 150?μm that are deposited on a thin (220?μm) rutile substrate and fed from the rear by a microstrip line. This allows accommodating a large flat sample above the resonator in addition to having variable coupling properties. Such resonators have a very small volume which, compared to previous designs, improves their absolute spin sensitivity by a factor of more than 2 (based on experimental results). They also have a very high microwave field-power conversion ratio of up to 86?gauss/√Hz. This could facilitate the use of very short excitation pulses with relatively low microwave power. Following the presentation and the discussion of the experimental results, ways to further increase sensitivity significantly are outlined. 相似文献
96.
Vilas G. Pol Swati V. Pol Pani P. George Aharon Gedanken 《Journal of Materials Science》2008,43(6):1966-1973
This paper describes a non-aqueous, solvent-free, environmentally friendly, one-pot facile reaction to synthesize inorganic
materials inclusion with carbon (MoS2 or MoSe2/C) at low temperatures. Nanoflakes of MoS2 and MoSe2 inclusion with carbon are prepared by a thermal (750 °C) reaction between Mo(CO)6 and S or Se at their autogenic pressure in a closed reactor under inert atmosphere. Elemental sulfur or selenium powders
are chosen in order to avoid the use of highly toxic H2S and H2Se gases. Without further processing of the as-prepared MoS2/C or MoSe2/C products, their compositional, morphological and structural characterization are carried out. The possibility of hydrogen
storage in as-synthesized MoS2/C or MoSe2/C products is examined. A probable reaction mechanism for the formation of MoS2 or MoSe2 nanoflakes inclusion with C is discussed. 相似文献
97.
98.
采用微波加热Polyol法以PVP作为稳定剂,首先快速合成了晶粒尺寸为2~6nm具有不同长宽比的各向异性的单分散金属钌胶体颗粒.以单分散胶体颗粒为晶种,获得不同团聚程度的纳米金属钌颗粒.高分辨电子显微镜(HRTEM)研究表明,树枝状纳米金属钌是由随机取向的金属钌单晶颗粒组成的. 相似文献
99.
报道了利用溶剂热工艺在乙醇溶液中制备胶态纳米金属钌颗粒的方法. 在120.℃热处理不同时间后, 观测到溶剂热还原反应形成不同颜色的中间体. 通过添加醋酸根稳定剂, 在乙醇溶剂中形成晶粒尺寸为3~6纳米的单分散金属钌颗粒. 通过该方法还合成了溴化十六烷基三甲铵(HTAB)包敷的晶粒尺寸为1~5纳米的金属钌粉体. 相似文献
100.
A Zn‐Doped CuO Nanocomposite Shows Enhanced Antibiofilm and Antibacterial Activities Against Streptococcus Mutans Compared to Nanosized CuO
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Michal Eshed Jonathan Lellouche Aharon Gedanken Ehud Banin 《Advanced functional materials》2014,24(10):1382-1390
Zinc‐doped copper oxide and copper oxide nanoparticles (NPs) are synthesized and deposited on artificial teeth by sonic irradiation, and the ability of these coatings to restrict biofilm formation by Streptococcus mutans is examined. The CuO and Zn:CuO NP‐coated teeth show significant reductions in biofilm formation of 70% and 88%, respectively, compared to uncoated teeth. The mechanism of the Zn:CuO nanoparticles is investigated, revealing that the nanoparticles attach to and penetrate the bacteria and generate intracellular reactive oxygen species (ROS) that enhance lipid peroxidation and cause cell death. Conversely, the CuO or ZnO NPs do not show this behavior and could not generate intracellular ROS. These results highlight the superior efficacy of Zn:CuO nanocomposites over CuO and ZnO NPs and the role of ROS in their antimicrobial effect. 相似文献