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排序方式: 共有166条查询结果,搜索用时 312 毫秒
111.
Eye‐Catching Dual‐Fluorescent Dynamic Metal–Organic Framework Senses Traces of Water: Experimental Findings and Theoretical Correlation 下载免费PDF全文
Dr. Biswajit Bhattacharya Arijit Halder Lopa Paul Dr. Swapan Chakrabarti Dr. Debajyoti Ghoshal 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(42):14998-15005
A guest‐dependent dynamic fivefold interpenetrated 3D porous metal–organic framework (MOF) of ZnII ions has been synthesized that exhibits selective carbon dioxide adsorption. Furthermore, the MOF shows excellent luminescence behavior, which is supported by a systematic study on the guest‐responsive multicolor emission of a suspension of the MOF. The dual‐emission behavior arises from the excited‐state intramolecular proton transfer (ESIPT), and the compound also shows remarkable potential to detect traces of water in various organic solvents. The experimental observations were also painstakingly authenticated by using time‐dependent density‐functional‐theory (DFT) calculations. 相似文献
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113.
Subramanya Gopal Hegde Vijayakumar G. Revanasiddappa Suchetan P. Adimule Suman Y. Reddy Atanu Ghoshal 《合成通讯》2013,43(19):2485-2495
A new julolidine hybrid analogs have been accomplished in a regio and stereo controlled manner using heterogenous MgSiO3 nanoparticles (NPs) catalyzed intramolecular dipolar cycloaddition reaction as a key step. The synthesized catalyst was used in the preparation of various new julolidine analogs with a good yield ranging from 65 to 85%. Further, catalyst could be recycled in several times without loss of significant activity which was an added advantage to the principles of green chemistry. 相似文献
114.
Ghoshal G Luchies AC Blue JP Oelze ML 《The Journal of the Acoustical Society of America》2011,130(4):2203-2211
Quantitative ultrasound (QUS) is an imaging technique that can be used to quantify tissue microstructure giving rise to scattered ultrasound. Other ultrasonic properties, e.g., sound speed and attenuation, of tissues have been estimated versus temperature elevation and found to have a dependence with temperature. Therefore, it is hypothesized that QUS parameters may be sensitive to changes in tissue microstructure due to temperature elevation. Ultrasonic backscatter experiments were performed on tissue-mimicking phantoms and freshly excised rabbit and beef liver samples. The phantoms were made of agar and contained either mouse mammary carcinoma cells (4T1) or chinese hamster ovary cells (CHO) as scatterers. All scatterers were uniformly distributed spatially at random throughout the phantoms. All the samples were scanned using a 20-MHz single-element f/3 transducer. Quantitative ultrasound parameters were estimated from the samples versus increases in temperature from 37 °C to 50 °C in 1 °C increments. Two QUS parameters were estimated from the backscatter coefficient [effective scatterer diameter (ESD) and effective acoustic concentration (EAC)] using a spherical Gaussian scattering model. Significant increases in ESD and decreases in EAC of 20%-40% were observed in the samples over the range of temperatures examined. The results of this study indicate that QUS parameters are sensitive to changes in temperature. 相似文献
115.
Subhendra Mohanty Varun Sahni S. Chakraborty Ashok Goyal Sukanta Dutta Debajyoti Choudhury Shobhit Mahajan Amitabha Mukherjee Hatem Widyan Urjit Yajnik S. Mohanty J. A. Grifols Uma Mahanta Sarira Sahu Varun Sahni Tarun Souradeep Albert Stebbins Ioav Waga Vikram Soni N. Panchapakesan R. Brandenberger 《Pramana》1998,51(1-2):273-286
The astroparticle physics working group witnessed intense discussion and activity covering a broad range of topics ranging
from supergravity and baryogenesis to compact stars and the large scale structure of the Universe. A summary of some of the
subject areas in which collaborations were initiated during WHEPP-5 is presented below. 相似文献
116.
Sharma P Chhabra S Rai N Ghoshal N 《Journal of chemical information and modeling》2007,47(3):1087-1096
117.
Umesh Gupta D. Mohan S.K. Ghoshal Vandana Nasa 《Journal of photochemistry and photobiology. A, Chemistry》2010,209(1):7-11
Dynamics related to the optical effect of Methylene Blue (MB) dye molecules in solid host has been investigated. MB doped silica samples of varying concentrations are prepared by the sol–gel technique in acidic environment. Absorption and laser induced fluorescence spectra have been recorded for the samples. Interesting result of dual fluorescence at lower concentrations is explained. Attempt is done to study the dynamics of the dual fluorescence. These results may be useful for designing and developing solid-state optoelectronic devices. 相似文献
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119.
Debajyoti Bhattacharjee Anusree Ghosh T. N. Misra S. K. Nandy 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》1995,51(14)
The experimental non-coincidence splitting of the C=O stretching Raman band of acetone in dichloromethane, chloroform and carbontetrachloride solvents has been compared with the theoretical values predicted by dipolar resonant transfer model of Mirone and coworkers and that by mean spherical approximation model of Logan. It is observed that Logan's theory better reflects the origin of the non-coincidence effect in these binary mixtures. 相似文献
120.
Recently, it has been shown that heme binds to Aβ peptides which may play a major role in Alzheimer's disease (AD). This study illustrates that Aβ peptides can bind both Cu and heme cofactors at the same time. Both cofactors have unique spectroscopic and electrochemical features which are unaffected in the presence of the other, implying that they are electronically, chemically, and electrochemically uncoupled. These data clearly indicate that Cu cannot bind to three histidine residues simultaneously in Cu-Aβ complexes as previously proposed, since one of the histidines is involved in binding heme. The heme-Aβ and the heme-Cu-Aβ peptide complexes function as peroxidases. Interestingly, the Cu-Aβ complex also exhibits peroxidase activity, which may have significant implications in AD. Both Cu(+)-Aβ and heme (Fe(2+))-Aβ complexes reduce O(2) to H(2)O(2) quantitatively. Only one of the two electrons that are required for the reduction of O(2) to H(2)O(2) is derived from the reduced metal site, while the Tyr(10) residue of the native Aβ peptide donates the second electron. This Tyr(10) residue, the source of electron for the generation of partially reduced oxygen species (PROS, e.g., H(2)O(2)) is absent in rodents, which do not get affected by AD. When both heme and Cu are bound to the Aβ peptides, which is likely to happen physiologically, the amount of toxic PROS generated is maximum, implying that heme-Cu-Aβ complexes could potentially be most toxic for AD. 相似文献