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1.
Zaheer Khan Shaeel Ahmed Al-Thabaiti E.H. El-Mossalamy A.Y. Obaid 《Colloids and surfaces. B, Biointerfaces》2009,73(2):284-288
We produced gels using electrolytic-reduction ion water and magnesium aluminum silicates (smectone®), and evaluated in detail gel properties in the presence of various types of salt (NaCl, KCl, CaCl2, MgCl2, and AlCl3). Each salt was added to deionized-distilled water or electrolytic-reduction ion water, and phase diagrams for the smectone® concentration (2.0–4.0%) were produced. The areas of the three phases of smectone® (gel, sol, and separation) at each salt concentration were expressed as percentages of the total area. As a result, uni- and polyvalent cations (excluding Ca2+ ions) affected the stability of gels produced using electrolytic-reduction ion water, and, particularly, univalent cations (Na+, K+) markedly improved gel stability.Using electrolytic-reduction ion water as a dispersal medium, drug delivery systems (DDS) that can maintain the gelling state can be prepared. Thus, gel preparations with maintained functions or controlled-release transdermal drugs can be obtained. 相似文献
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E H El-Mossalamy A S Amin A A Khalil 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2002,58(1):67-72
Molecular charge-transfer (CT) complexes of some oxazolone derivatives with sigma-electron acceptor iodine have been investigated spectrophotometrically in CH2Cl2 at 20 degrees C. Stability constants of the CT complexes formed were computed and discussed in terms of the donor molecular structure and solvent polarity. The thermodynamic parameters of complex formation were determined and discussed. The solid CT complexes have been synthesized and characterized. It was deduced that the complexes formed are of strong n-sigma kind. 相似文献
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M. Pandeeswaran E. H. El-Mossalamy K. P. Elango 《Journal of solution chemistry》2012,41(12):2091-2106
The interaction of oxatomide (OXA), azacyclonol (AZA) and chloropheniramine (ClPA) antihistamine drugs with iodine was studied spectrophotometrically in different solvents and at three different temperatures. The electronic, FT-IR, far-IR, and mass spectra of the resulting charge-transfer (CT) complexes were recorded, in addition to thermal analysis. The results obtained show that the stoichiometries of the reactions are all 1:1. The observed time dependence of the CT band and subsequent formation of $ {\text{I}}_{3}^{ - } $ in solution were related to the slow transformation of the initially formed 1:1 (donor: I2) outer complex to an inner complex (electron donor?Cacceptor), followed by a fast reaction of the inner complex with iodine to form a triiodide ion. The characteristic strong absorptions of $ {\text{I}}_{3}^{ - } $ are observed around 360?nm. The CT-complexes have the formulae [(OXA)I]+ $ {\text{I}}_{3}^{ - } $ , [(AZA)I]+ $ {\text{I}}_{3}^{ - } $ and [(ClPA)I]+ $ {\text{I}}_{3}^{ - } $ . The formation constants (K), molar absorption coefficients (?? CT), and thermodynamic parameters ??H #, ??S # and ??G # of these interaction have been determined and discussed. 相似文献
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El-Sayed H. El-Mossalamy Fawzia M. Al-Nowaiser Shaeel A. Al-Thabaiti Abdul O. Al-Youbi Suliman N. Baschel Abdulla Y. Obaid 《Monatshefte für Chemie / Chemical Monthly》2007,138(9):853-857
Summary. The new polymer containing cyano groups was synthesized by γ-irradiation. The oximated polymer was prepared using hydroxylamine
hydrochloride in basic medium. The characterization of monomer, polymer, and oximated ones was confirmed by infrared and nuclear
magnetic resonance spectroscopy. The complex formation of the amidoxime salt towards ZnII, CuII, and ZnII/CuII mixture in aqueous solution was studied by atomic absorption spectroscopy, energy dispersive spectroscopy, and electron spin
resonance spectrometry. The significant binding capacity of these metal ions revealed its selectivity to Zinc(II) ion. The
thermal stability of polymers and complexed ones was investigated using thermogravimetry analysis. The change in their morphology
was observed by scanning electron microscopy (SEM). 相似文献
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Angie?S?Mah Andrew?EH?Elia Geeta?Devgan Jason?Ptacek Mike?Schutkowski Michael?Snyder Michael?B?Yaffe Raymond?J?DeshaiesEmail author 《BMC biochemistry》2005,6(1):22
Background
The mitotic exit network (MEN) is a group of proteins that form a signaling cascade that is essential for cells to exit mitosis in Saccharomyces cerevisiae. The MEN has also been implicated in playing a role in cytokinesis. Two components of this signaling pathway are the protein kinase Dbf2 and its binding partner essential for its kinase activity, Mob1. The components of MEN that act upstream of Dbf2-Mob1 have been characterized, but physiological substrates for Dbf2-Mob1 have yet to be identified. 相似文献7.
El-Mossalamy EH 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2004,60(5):1161-1167
The molecular charge-transfer complexes of phenylephrine with picric acid and m-dinitrobenzene have been studied and investigated by IR, 1H NMR electronic spectra in organic solvents and buffer solutions, respectively. Simple and selective methods are proposed for the determination of phenylephrine hydrochloride in bulk form and in tablets. The two methods are based on the formation of charge-transfer complexes between drug base as a n-donor (D) and picric acid, m-dinitrobenzene as pi-acceptor (A). The products exhibit absorption maxima at 497 and 560 nm in acetonitrile for picric acid and m-dinitrobenzene, respectively. The coloured product exhibits an absorption maximum at 650 nm in dioxane. The sensitive kinetic methods for the determination phynylephrine hydrochloride are described. The method is based upon a kinetic investigation of the oxidation reaction of the drug with alkaline potassium permanganate at room temperature for a fixed time at 20 min. 相似文献
8.
Rednikov AY; Zhao Hong; Sadhal SS; Trinh EH 《The Quarterly Journal of Mechanics and Applied Mathematics》2006,59(3):377-397
The steady (acoustic) streaming associated with a sphericaldrop displaced from the velocity antinode of a standing waveis studied. The ratio of the particle size to the acoustic wavelengthis treated as small but non-zero, and the solution is developedin the form of a two-term expansion in terms of the correspondingsmallness parameter. The drop viscosity is assumed to be muchhigher than that of the surrounding fluid, which is the casefor a drop in a gas medium. There are essentially three distinctregions where the steady streaming flow is analysed: insidethe drop (internal circulation), in the Stokes shear-wave layerat the surface on the gas side, and the gas outside the Stokeslayer (the outer streaming region). Solutions for the internalcirculation and the outer streaming are obtained in the limitof small Reynolds number. Despite the gas-to-liquid viscosity ratio being small, the outerstreaming may be dramatically affected by the fact that thesphere is liquid as opposed to solid. The parameter that measuresthe effect of liquidity is essentially the viscosity ratio dividedby the relative (to the particle size) thickness of the Stokeslayer. The case of a solid sphere is recovered by letting thisparameter go to zero. 相似文献
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