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排序方式: 共有168条查询结果,搜索用时 156 毫秒
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84.
Neetu Jha Palanisamy Ramesh Elena Bekyarova Mikhail E. Itkis Robert C. Haddon 《Liver Transplantation》2012,2(4):438-444
A high energy density supercapacitor device is reported that utilizes hybrid carbon electrodes and the ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF4) as an electrolyte. The hybrid electrodes are prepared from reduced graphite oxide (rGO) and purified single‐walled carbon nanotubes (SWCNTs). A simple casting technique gives the hybrid structure with optimum porosity and functionality that provides high energy and power densities. The combination of SWCNTs and rGO in a weight ratio of 1:1 is found to afford a specific capacitance of 222 F g?1 and an energy density of 94 Wh kg?1 at room temperature. 相似文献
85.
Palanisamy Uma Maheswari 《Inorganica chimica acta》2004,357(4):901-912
The interaction of a series of mixed ligand complexes of the type [Ru(NH3)4(diimine)]Cl2, where diimine=2,2′-bipyridine (bipy), 1,10-phenanthroline (phen), 5,6-dimethyl-1,10-phenanthroline (5,6-dmp), 4,7-dimethyl-1,10-phenanthroline (4,7-dmp), 2,9-dimethyl-1,10-phenanthroline (2,9-dmp), 3,4,7,8-tetra-methyl-1,10-phenanthroline (Me4phen), with calf thymus DNA has been studied using absorption, emission and circular dichroic spectral measurements and viscometry and electrochemical techniques. On interaction with DNA the complexes show hypochromism and red-shift in their MLCT band suggesting that the complexes bind to DNA. The magnitude of the binding constant (Kb) obtained from absorption spectral titration varies depending upon the nature of the diimine ligand: Me4phen > 5,6-dmp > 4,7-dmp > phen suggesting the use of diimine ‘face’ of the octahedral complexes in binding to DNA. The interaction of phen complex possibly involves phen ring partially inserted into the DNA base pairs. In contrast, the methyl-substituted phen complexes would involve hydrophobic interaction of the phen ring in the grooves of DNA, which is supported by hydrogen bonding interactions of the ammonia ligands with the intrastrand nucleobases. Also the shape and size of the phen ligand as modified by the methyl substituents determine the DNA binding site sizes (0.12-0.45 base pairs). The relative emission intensities (I/I0) of the DNA-bound complexes parallel the variation in Kb values. Almost all the metal complexes exhibit induced CD bands on binding to B DNA, with the 4,7-dmp and Me4phen complexes inducing certain structural modifications on the biopolymer. DNA melting curves obtained in the presence of metal complexes reveal a monophasic melting of the DNA strands, the Me4phen complex exhibiting a slightly enhanced tendency to stabilize the double-stranded DNA. There were slight to appreciable changes in the relative viscosities of DNA, which are consistent with enhanced hydrophobic interaction of the methyl-substituted phen rings. Upon interaction with CT DNA, the Me4phen, 4,7-dmp and 5,6-dmp complexes, in contrast to bipy, phen and 2,9-dmp complexes, show a decrease in anodic peak current in their cyclic voltammograms suggesting that they exhibit enhanced DNA binding. DNA cleavage experiments show that all the complexes induce cleavage of pBR322 plasmid DNA, the Me4phen and 5,6-dmp complexes being remarkably more efficient than other complexes. 相似文献
86.
Prasanth Rayorath Wajahatullah Khan Ravishankar Palanisamy Shawna L. MacKinnon Roumiana Stefanova Simon D. Hankins Alan T. Critchley Balakrishan Prithiviraj 《Journal of Plant Growth Regulation》2008,27(4):370-379
Extracts of the brown seaweed Ascophyllum nodosum have been used as a biostimulant to promote growth and productivity in a number of agricultural production systems. Although
the extracts have been shown to improve seedling emergence and vigor in a variety of plants, including barley, the mechanism(s)
of this growth-promoting effect is(are) largely unknown. In our study, A. nodosum extract induced amylase activity in barley seed-halves; a significant difference in amylase activity was observed in seeds
without an embryo. The addition of activated charcoal to the treatment media negated the bioactivity of the extracts suggesting
the organic nature of bioactive compounds in A. nodosum extracts. The extracts induced amylase activity in a gibberellic acid (GA)-deficient barley mutant (grd2). LC-MS-MS analysis failed to detect the presence of GA3 in the extracts. ABA supplementation of the medium caused a significant reduction of amylase activity in GA-treated seeds
compared with those treated with the A. nodosum extract. Taken together, our results suggest that the organic components of A. nodosum extract induce amylase activity independent of GA3 and might act in concert with GA-dependent amylase production leading to enhanced germination and seedling vigor in barley.
Being derived from a renewable resource, the bioactive compounds from A. nodosum could be used to improve crop productivity in sustainable agricultural systems. 相似文献
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88.
K. Palanisamy 《Photosynthetica》1999,36(4):635-638
Response of net photosynthetic rate (P
N), stomatal conductance (g
s), intercellular CO2 concentration (c
i), and photosynthetic efficiency (Fv/Fm) of photosystem 2 (PS2) was assessed in Eucalyptus cladocalyx grown for long duration at 800 (C800) or 380 (C380) μmol mol-1 CO2 concentration under sufficient water supply or under water stress. The well-watered plants at C800 showed a 2.2 fold enhancement of P
N without any change in g
s. Under both C800 and C380, water stress decreased P
N and g
s significantly without any substantial reduction of c
i, suggesting that both stomatal and non-stomatal factors regulated P
N. However, the photosynthetic efficiency of PS2 was not altered.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
89.
Chin-Yo Lin Vinsensius B Vega Jane S Thomsen Tao Zhang Say Li Kong Min Xie Kuo Ping Chiu Leonard Lipovich Daniel H Barnett Fabio Stossi Ailing Yeo Joshy George Vladimir A Kuznetsov Yew Kok Lee Tze Howe Charn Nallasivam Palanisamy Lance D Miller Edwin Cheung Benita S Katzenellenbogen Yijun Ruan Guillaume Bourque Chia-Lin Wei Edison T Liu 《PLoS genetics》2007,3(6)
90.