排序方式: 共有29条查询结果,搜索用时 15 毫秒
1.
Gareth AD Hardy Nesrina Imami Mark R Nelson Ann K Sullivan Ron Moss Marlén MI Aasa-Chapman Brian Gazzard Frances M Gotch 《Journal of immune based therapies and vaccines》2007,5(1):6-12
Background
Fully functional HIV-1-specific CD8 and CD4 effector T-cell responses are vital to the containment of viral activity and disease progression. These responses are lacking in HIV-1-infected patients with progressive disease. We attempted to augment fully functional HIV-1-specific CD8 and CD4 effector T-cell responses in patients with advanced chronic HIV-1 infection. 相似文献2.
3.
Balaban TS Linke-Schaetzel M Bhise AD Vanthuyne N Roussel C Anson CE Buth G Eichhöfer A Foster K Garab G Gliemann H Goddard R Javorfi T Powell AK Rösner H Schimmel T 《Chemistry (Weinheim an der Bergstrasse, Germany)》2005,11(8):2267-2275
We report two crystal structures of a synthetic porphyrin molecule which was programmed for self-assembly. The same groups which ensure that bacteriochlorophylls c, d, and e can self-assemble into the chlorosomal nanorods, the photosynthetic antenna system of some green bacteria, have been engineered into desired positions of the tetrapyrrolic macrocycle. In the case of the 5,15-meso-substituted anchoring groups, depending upon the concentration, by using the same crystallization solvents, either a tetragonal or a layered structure of porphyrin stacks were encountered. Surprisingly, pi-pi interactions combined with extensive dispersive interactions, which also encompass cyclohexane, one of the crystallization solvents, win over putative hydrogen bonding. We are aware that our compounds differ considerably from the natural bacteriochlorophylls, but based upon our findings, we now question the hydrogen-bonding network, previously proposed to organize stacks of bacteriochlorophylls. Transmission electron microscopy (TEM), atomic force microscopy (AFM), and small-angle X-ray scattering (SAXS) on various isomeric compounds support our challenge of current models for the chlorosomal antenna as these show structures, astonishingly similar to those of chlorosomes. 相似文献
4.
5.
Ashok B. Bhise Dattatray J. Late Bhaskar R. Sathe Mahendra A. More Imtiaz S. Mulla Vijayamohanan K. Pillai Dilip S. Joag 《Solid State Sciences》2009,11(6):1114-1117
Tin oxide submicronwires doped with Fe element were prepared by the thermal evaporation method. Morphological and structural characterizations revealed wires with sub micron size and crystalline in nature. The field electron emission from the single Fe:SnO2 wire was carried out in conventional field emission microscope. The Fowler–Nordheim plot obtained from I–V characteristics of the wire showed a linear behavior typical that of metal. The field enhancement factor estimated from the slope of the F–N plot is 7455 cm?1, indicating that the field emission is from nanometric features of the emitter. A current density of 10 A/cm2 has been obtained at an applied field of 4.845 × 103 V/μm. The field emission current–time record at a current level of 1 μA for more than 3 h duration is promising for various field emissions based applications. 相似文献
6.
7.
Ramgir NS Late DJ Bhise AB More MA Mulla IS Joag DS Vijayamohanan K 《The journal of physical chemistry. B》2006,110(37):18236-18242
A simple method of vapor deposition for the shape selective synthesis of ZnO structures, namely, multipods, submicron wires, and spheres, has been successfully demonstrated. A plausible growth mechanism based on the studies of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) is proposed. Our studies suggest that the growth of a multipod structure is governed by the screw dislocation propagation while the vapor-liquid-solid (VLS) mechanism is responsible for the formation of submicron wires and spheres. Moreover, the flow rate of the carrier gas plays a crucial role in governing the morphology. Further, these structures exhibit an enhanced field emission behavior. The nonlinearity in the Fowler-Nordheim (F-N) plot, a characteristic feature of electron emission from semiconductors, is explained by considering the contributions from both the conduction and the valence bands of ZnO. 相似文献
8.
Ashok B. Bhise Niranjan S. Ramgir Imtiaz S. Mulla Dilip S. Joag 《Applied Surface Science》2007,253(23):9159-9163
Field emission studies of a bunch and a single isolated RuO2:SnO2 wire have been performed. A current density of 5.73 × 104 A/cm2 is drawn from the single wire emitter at an applied field of 8.46 × 104 V/μm. Nonlinearity in the Fowler-Nordheim (F-N) plot has been observed and explained on the basis of electron emission from both the conduction and the valence bands of the semiconductor. The current stability recorded at the preset value of 1.5 μA is observed to be good. Overall the high emission current density, good stability and mechanically robust nature of the RuO2:SnO2 wires offer advantages as field emitters for many potential applications. 相似文献
9.
We have directly time resolved the lattice motions associated with the formation of the self-trapped exciton in the quasi-one-dimensional system [Pt(en)(2)] [Pt(en)2Br2];(PF6)(4) ( en = ethylene-diamine, C2H8N2), using femtosecond impulsive excitation techniques. A strongly damped, low-frequency wave packet modulation at approximately 110 cm(-1) accompanies the formation of the self-trapped exciton on a approximately 200 fs time scale following excitation of the intervalence charge-transfer transition. Coherent oscillations at the ground state vibrational frequency and its harmonics are also detected. 相似文献
10.
Patil Sandip K. Bhise Sagar C. Awale Deepak V. Vadiyar Madagonda M. Patil Suryakant A. Gunjal Dattatray B. Kolekar Govind B. Ghorpade Uma V. Kim Jin H. Kolekar Sanjay S. 《Research on Chemical Intermediates》2018,44(10):6267-6282
Research on Chemical Intermediates - We explored a geminal dicationic ionic liquid (DCIL), 1′-(propane-1,3-diyl)bis(4-aminopyridin-1-ium) dibromide, [C3(Amp)2][Br]2, as a fluorescent probe... 相似文献