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81.
The temperature dependence of the Electric Field Gradient (EFG) in PbHfO3 was studied in the temperature range 25–225°C by the Differential Perturbed Angular Correlation method. In the two anti-ferroelectric phases below 215°C, not too close to either transition temperature, the EFG decreases as the temperature increases toward Tc. Just above Tc an abrupt rise of EFG was observed indicating a critically behaving contribution to EFG. The results are interpreted in terms of a model based on the local static as well as time-dependent changes of the electric environment, at a lattice site. In accord with the predictions of this model the results exhibit qualitatively the P2s temperature dependence of EFG far from Tc, where Ps is the sub-lattice polarization, while in close proximity to Tc the dominant contribution to EFG is due to the susceptibility Xq connected with the soft-mode fluctuations. The derived critical exponents are in agreement with previous experimental results on related compounds and with theoretical predictions. A hitherto unobserved additional component of Vzz was established, behaving critically at the antiferro-paraelectric transition at 215°C. This new component is interpreted to originate in local fluctuations connected with the central mode. 相似文献
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84.
A library of "hydraphile" synthetic ion channel analogues that differ in overall length from approximately 28-58 A has been prepared. A new and convenient ion-selective electrode (ISE) method was used to assay Na(+) release. Liposomes were formed from three different phospholipids: 1,2-dimyristoleoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), and 1,2-dierucoyl-sn-glycero-3-phosphocholine (DEPC). The acyl chains of the lipids comprise cis-unsaturated 14:1, 18:1, or 22:1 residues, respectively. Sodium release was measured for each liposome system with each of the synthetic channels. Peak activity was observed for shorter channels in liposomes formed from DMPC and for longer channels in DEPC. A separate study was then conducted in DMPC liposomes in the presence of the putative membrane-thickening agents cholesterol and decane. Peak activity was clearly shifted to longer channel lengths upon addition of 20 or 40 mol % cholesterol or n-decane to the liposome preparation. 相似文献
85.
J. V. Dubský M. Kura H. I. Schlesinger H. B. van Valkenburgh und C. H. Liberalli 《Fresenius' Journal of Analytical Chemistry》1936,104(1-2):52-54
Ohne Zusammenfassung 相似文献
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87.
Schlesinger 《Fresenius' Journal of Analytical Chemistry》1874,13(1):340
Ohne Zusammenfassung 相似文献
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Enrico Schlesinger 《代数通讯》2013,41(12):5883-5889
We determine the triples F,G,H of vector bundles of finite rank on P1 which may fit in an exact sequence 0→F→G→H→0. 相似文献
90.