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1.
Skripnikova Tatiana A. Starikova Anna A. Shumilova Galina I. Ermolenko Yuri E. Pendin Andrey A. Mourzina Yulia G. 《Journal of Solid State Electrochemistry》2017,21(8):2269-2279
Journal of Solid State Electrochemistry - We report a new type of solid-state electrode (type I) of a simple design with polyvinyl chloride membranes based on Mn(III) tetraphenylporphyrin and with... 相似文献
2.
Aliev L. A. Vishnyakova T. P. Paushkin Ya. M. Pendin A. A. Sokolinskaya T. A. Stukan R. A. 《Russian Chemical Bulletin》1970,19(2):256-259
Russian Chemical Bulletin - 相似文献
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A. Yu. Mikheev M. V. Lemesh A. A. Pendin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(7):1066-1069
The standard states of quinone and hydroquinone were selected to be those of pure substances, which allowed us to introduce the solubility product of quinhydrone. This selection of the standard state made it possible to interpret both the interval and direction of changes in the oxidation potential of graphite electrodes whose pores were filled by these substances in aqueous solutions with a fixed acidity. 相似文献
4.
The basicity constants of a series of para-substituted tetraphenylporphyrins have been determined by two-phase spectrophotometric titration with pH monitoring in the chloroform-aqueous electrolyte solution system; the pH ranges of prevailing of the dication and the neutral forms of the porphyrins have been estimated. With introducing the donor substituents at the para-position of phenyl fragments of porphyrins, the compound basicity increases. Ionization constant of the pyrrole nitrogen atoms depends on the donor-acceptor properties of the substituents according to the Hammett equation. Basing on the derived dependence, theoretical basicity constants of the para-substituted porphyrins bearing strongly donor groups have been predicted. 相似文献
5.
Data on water activity in solutions of a series of 3 : 1 and 1 : 3 electrolytes [AlCl3, Al(NO3)3, LaCl3, La(NO3)3, H3PO4, NaH2PO4] have been generalized in the frame of solvation excesses concept. Solvation excess reflects the distribution of the selected structural elements (ions or solvent particles) in the solution. The computed values have demonstrated the opposite contributions of ion association and hydration of ions and ion associates. Solvation excess concept allows determination of water molecules fraction constituting the excess at ions and their associates. The comparison of results obtained with different choice of model structural units has shown the electrolyte concentration ranges of validity of the respective models. 相似文献
6.
A. A. Starikova A. A. Pendin A. B. Valiotti 《Russian Journal of General Chemistry》2014,84(3):545-549
Phase-transfer potentiometric titration with potentiometric pH control in the system chloroform-aqueous electrolyte solution was used to determine basicity constants for octamethyl-substituted tetraphenylporphyrins. The pH ranges were determined, where the dicationic form of octa- and dodecamethylsubstituted tetraphenylporphyrins is prevailing. It was shown that the basicity of tetraphenylporphyrins is increased by methyl substitution of β-hydrogens (formation of octamethyl-substituted tetraphenylporphyrins). Further methylation of the four central nitrogen atoms of the porphyrin (formation of dodecamethyl-substituted tetraphenylporphyrins) extends the dication stability pH range to 12. 相似文献
7.
S. Karabaev I. Gainullina A. Harchenko M. Satarova S. Lugovskoy A. Pendin 《Journal of solution chemistry》2012,41(6):1013-1019
Humic acids were extracted from brown coals of the Kara-Keche deposit (Kyrgyzstan) and characterized. The solubility of humic acid in aqueous urea solutions was studied. The solvation excess of urea over water on humic acid in solution was calculated. The possibility of simultaneous binding of urea molecules on three independent centers of humic acids was shown. An estimation of humic acid molecular dimensions in aqueous urea solutions is given. 相似文献
8.
Diana Pendin Rosa Norante Andrea DeNadai Gaia Gherardi Nicola Vajente Emy Basso Nina Kaludercic Cristina Mammucari Cristina Paradisi Tullio Pozzan Andrea Mattarei 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(29):10022-10027
Ca2+ handling by mitochondria is crucial for cell life and the direct measure of mitochondrial Ca2+ concentration in living cells is of pivotal interest. Genetically‐encoded indicators greatly facilitated this task, however they require demanding delivery procedures. On the other hand, existing mitochondria‐targeted synthetic Ca2+ indicators are plagued by several drawbacks, for example, non‐specific localization, leakage, toxicity. Here we report the synthesis and characterization of a new fluorescent Ca2+ sensor, named mt‐fura‐2, obtained by coupling two triphenylphosphonium cations to the molecular backbone of the ratiometric Ca2+ indicator fura‐2. Mt‐fura‐2 binds Ca2+ with a dissociation constant of ≈1.5 μm in vitro. When loaded in different cell types as acetoxymethyl ester, the probe shows proper mitochondrial localization and accurately measures matrix [Ca2+] variations, proving its superiority over available dyes. We describe the synthesis, characterization and application of mt‐fura‐2 to cell types where the delivery of genetically‐encoded indicators is troublesome. 相似文献
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10.
A. A. Pendin A. S. Kazak 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(8):1345-1351
The data on component activities and salt solubilities were analyzed to determine solvation excesses in the H2O-KCl-NaCl and H2O-KNO3-NaNO3 systems. Some rules governing the solvation of ions were discussed. 相似文献