排序方式: 共有189条查询结果,搜索用时 15 毫秒
61.
Azadeh Azadbakht Jalaledin Aali Amir Reza Abbasi Maryam Maghsudi 《Russian Journal of Electrochemistry》2017,53(4):345-351
Thin films of a three-dimensional porous Zn(II)-based metal–organic framework, [Zn2(NH2-BDC)2(4-bpdb)] · 3DMF (TMU-17-NH2), containing azine-functionalized pores, were deposited on surfaces of silk fiber via a stepwise manner. The effect of sequential dipping steps in growth of TMU-17-NH2 has been studied. These systems depicted a decrease in the size accompanying a decrease in the sequential dipping steps. The TMU-17-NH2 has been used as matrices for the adsorption and in vitro guest delivery of methyldopa (MD). 相似文献
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Abdolali Alizadeh Azadeh Mikaeili Tahereh Firuzyar Mahdi Ahmadi 《Helvetica chimica acta》2011,94(7):1343-1346
An efficient and simple route for the preparation of 2‐oxopyridine‐fused 1,3‐diazaheterocyclic compounds via a three component reaction is described. It involves the reaction between alkylenediamines 1 , 1,1‐bis(methylsulfanyl)‐2‐nitroethene, and alkyl prop‐2‐ynoates 2 in refluxing THF (Table). The structures were corroborated by spectroscopic (IR, 1H‐ and 13C‐NMR, and EI‐MS) and elemental analyses. A plausible mechanism for this type of cyclization is proposed (Scheme). 相似文献
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Ahmad Reza Massah Beheshteh Asadi Azadeh Molseghi Hamid Javaherian Naghash 《Tetrahedron》2009,65(36):7696-7705
Some metal hydrogen sulfates were used as acid catalysts in the N-acylation of different sulfonamides using carboxylic acid chlorides and anhydrides as acylating agents under both heterogeneous and solvent-free conditions. Al(HSO4)3 and Zr(HSO4)4 were found to have the highest activity and catalyze the reactions efficiently to furnish the primary N-acyl sulfonamides (RCONHSO2R′), secondary N-acylsulfonamides (RCONR″SO2R′) and bis-N-acylsulfonamnides [RCO(SO2R′)N-R″-N(SO2R′)COR] in good to high yield. The mild reaction conditions, inexpensive and low toxicity of catalysts and easy work-up procedure make this method attractive. 相似文献
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Sayyed Mohammad Ali Ne’mati Majid Ghassemi Azadeh Shahidian 《Transport in Porous Media》2017,119(2):461-480
Chemotherapy as one of the most utilized cancerous tumor treatment methods introduces undesired side effects due to penetrating toxic drugs into the healthy organs. Delivery of anticancer therapeutic agents to solid tumors is also problematic. The purpose of current study is to investigate the penetration of magnetic drug carriers (MDCs) within the cancerous solid tumor tissue under the influence of external magnet. Capillary wall and tumor tissue is modeled as a saturated porous media. In order to solve the coupled governing equations, mass, momentum and concentration, an in-house finite volume-based code is developed and utilized. Results show the penetration of MDCs into the tumor in the absence of magnetic field is minimal and is limited to the surface of the tumor. On the other hand, under the influence of external magnet the penetration of MDCs within the tumor increases exponentially. They also penetrate deep into the tumor and cover the entire tumor which increase the effectivity and decrease the side effect of the treatment. 相似文献
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Ze Xu Yi-Xuan Liu Maryam Azadeh Hao-Cheng Thong Yuqi Jiang Fang-Zhou Yao Zhen-Xing Yue Zhong-Tai Zhang Zi-Long Tang Jing-Feng Li Heng Wang Till Frömling Ke Wang 《Angewandte Chemie (International ed. in English)》2023,62(9):e202216776
Recent advances in perovskite ferroelectrics have fostered a host of exciting sensors and actuators. Defect engineering provides critical control of the performance of ferroelectric materials, especially lead-free ones. However, it remains a challenge to quantitatively study the concentration of defects due to the complexity of measurement techniques. Here, a feasible approach to analyzing the A-site defect and electron in alkali metal niobate is demonstrated. The theoretical relationships among defect concentration, conductivity, and oxygen partial pressure can be established based on the defect chemistry equilibria. The type and concentration of defects are reflected through the conductivity variation with oxygen partial pressure. As a result, the variation of defect concentration gives rise to defect-driven interfacial polarization, which further leads to distinct properties of the ceramics. e.g., abnormal dielectric behavior. Furthermore, this study also suggests a strategy to manipulate defects and charges in perovskite oxides for performance optimization. 相似文献
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Synthesis and Characterization of Tricarbastannatranes and Their Reactivity in B(C6F5)3‐Promoted Conjugate Additions 下载免费PDF全文
Azadeh Kavoosi Prof. Eric Fillion 《Angewandte Chemie (International ed. in English)》2015,54(18):5488-5492
The synthesis and characterization of a series of tricarbastannatranes, in the solid state and in solution, are described. The structures of the complexes [N(CH2CH2CH2)3Sn](BF4), [N(CH2CH2CH2)3Sn](SbF6), [N(CH2CH2CH2)3Sn]4[(SbF6)3Cl], and [(N(CH2CH2CH2)3Sn)2OH][MeB(C6F5)3] were determined by X‐ray crystallography. Furthermore, the B(C6F5)3‐promoted conjugate addition of alkyl‐tricarbastannatranes to benzylidene derivatives of Meldrum’s acid was investigated, and detailed mechanistic studies are presented. 相似文献
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Rasouli S Hosseinkhani S Yaghmaei P Ebrahim-Habibi A 《Applied biochemistry and biotechnology》2011,165(2):572-582
In this study, we used sugars as stabilizing additives to improve the thermostability and to inhibit aggregation of firefly
luciferase. The combination of sucrose and trehalose has a strong stabilizing effect on firefly luciferase activity and prevents
its thermoinactivation. These additives can also increase optimum temperature. It has been shown that the presence of both
sucrose and trehalose can inhibit thermal aggregation of firefly luciferase and decrease bioluminescence decay rate. In order
to understand the molecular mechanism of thermostabilization, we investigated the effects of sucrose and trehalose combination
on the secondary structure of luciferase by Fourier transform infrared spectroscopy. Minor changes in content of secondary
structure of firefly luciferase are observed upon treatment with additives. 相似文献
70.
Ding L Schulz P Farahzadi A Shportko KV Wuttig M 《The Journal of chemical physics》2012,136(5):054503
Intermolecular interactions in crystalline perylene films on Au(111) have been investigated by Fourier transform infrared spectroscopy. Dimer modes of vibrations are observed in the crystalline film, in contrast to the monomer modes found for isolated perylene molecules. These dimers are formed via hydrogen bonding in the sandwich herringbone structure of the crystalline α-phase. Davydov splitting of both the monomer and the dimer modes is observed due to resonance dynamic intermolecular interaction. The splitting of monomer modes into three distinct vibrations and the occurrence of the dimer modes confirm that the film crystallizes in the α phase, which is in line with the x-ray diffraction results. The frequency shift and band broadening at elevated temperature have been attributed to the cubic and quartic anharmonic interactions. 相似文献