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1.
V Correcher J Garcia-Guinea FJ Valle-Fuentes 《Journal of Thermal Analysis and Calorimetry》2006,83(2):439-444
In
this paper, novel results on the blue thermally stimulated luminescence (TSL)
emission of ulexite (NaCaB5O6(OH)6·5H2O)
have been studied. The four maxima appearing at 60, 110, 200 and 240°C
on the TSL glow curves of this borate could be respectively associated to:
(i) the first dehydration (NaCaB5O6(OH)6·5H2O→NaCaB5O6(OH)6·3H2O),
(ii) the creation-annihilation of the three-hydrated
phase, (iii) the Na-coordinated chains
dehydroxylation and the starting point of the alkali self-diffusion through
the lattice and (iv) the amorphisation
of the lattice. These results are fairly well correlated with the differential
thermal analyses (DTA), in situ thermal observations under environmental scanning
electron microscope (TESEM) and thermal X-ray diffraction (TXRD) techniques. 相似文献
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4.
A. Alberola L. F. Antolin A. M. Gonzalez M. A. Laguna F. J. Pulido 《Journal of heterocyclic chemistry》1986,23(4):1035-1038
The base-induced ring cleavage of 4-nitro-(Ia), 4-ethoxycarbonyl- (Ib) and 4-acetyl-5-methylisoxazole (Ic) and the conversion of the resulting β-cyanoenolates and β-enaminonitriles into 5-aminoazoles and 4-cyanoazoles was studied. 相似文献
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7.
The stereoselective synthesis of Z-β-siloxyacrylonitriles via base-induced ring cleavage of isoxazole precursors is described. Z-β-siloxyacrylonitriles react with organolithium compounds to give high yields of β-enaminoketones 1. 相似文献
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9.
Structural and Functional Implications of the Interaction between Macrolide Antibiotics and Bile Acids
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Simon Glanzer Sergio A. Pulido Sarah Tutz Dr. Gabriel E. Wagner Dr. Manfred Kriechbaum Nina Gubensäk Jovana Trifunovic Markus Dorn Prof. Dr. Walter M. F. Fabian Prof. Predrag Novak Prof. Dr. Joachim Reidl Prof. Dr. Klaus Zangger 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(11):4350-4358
Macrolide antibiotics, such as azithromycin and erythromycin, are in widespread use for the treatment of bacterial infections. Macrolides are taken up and excreted mainly by bile. Additionally, they have been implicated in biliary system diseases and to modify the excretion of other drugs through bile. Despite mounting evidence for the interplay between macrolide antibiotics and bile acids, the molecular details of this interaction remain unknown. Herein, we show by NMR measurements that macrolides directly bind to bile acid micelles. The topology of this interaction has been determined by solvent paramagnetic relaxation enhancements (solvent PREs). The macrolides were found to be bound close to the surface of the micelle. Increasing hydrophobicity of both the macrolide and the bile acid strengthen this interaction. Both bile acid and macrolide molecules show similar solvent PREs across their whole structures, indicating that there are no preferred orientations of them in the bile micelle aggregates. The binding to bile aggregates does not impede macrolide antibiotics from targeting bacteria. In fact, the toxicity of azithromycin towards enterotoxic E. coli (ETEC) is even slightly increased in the presence of bile, as was shown by effective concentration (EC50) values. 相似文献
10.
The silylcupration of allene using a lower order silylcopper species gives an allylsilane-vinyl copper intermediate 2 which, in conjunction with an organolithium reagent, is able to participate in a one-pot multicoupling reaction with α,β-unsaturated nitriles. The scope of this tandem reaction is studied and a possible mechanism pathway is outlined. 相似文献