Separation of Red Paprika Color Components by use of Thin-Layer Chromatography on a Variety of Supports

JPC – Journal of Planar Chromatography – Modern TLC -     

Separation of radioactive yttrium from strontium by means of mono-octyl anilinobenzylphosphonate

Zusammenfassung Die Trennung des radioaktiven⁹⁰Y von Sr mit Monooktyl-anilinobenzyl-phosphonat wurde beschrieben. Y geht aus 0,1- bis 0,01-m Salzsäure quantitativ in die organische Phase über, während Sr in der wäßrigen Phase bleibt. Die Trennung läßt sich entweder aus verd. Yttriumlösung oder bei Vorliegen der trägerfreien Form durchführen. Die Sr-Menge hat keinen Einfluß. Der Trennungsfaktor beträgt 10⁶. Die Reinheit des abgetrennten⁹⁰Y wurde an Hand seiner Abklingkurve geprüft.

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Part of the thesis submitted byN. Vujii in partial fulfilment of the requirements for the degree of Master of Science in Chemistry (M. Sc.) at the Faculty of Pharmacy and Biochemistry, University of Zagreb.     

Some problems of development of nonlinear mechanics

We consider some problems of nonlinear mechanics that originate in the mechanics of Newton and Lagrange. Using several examples, we show the necessity of reexamining some notions of classical mechanics. __________ Translated from Neliniini Kolyvannya, Vol. 10, No. 3, pp. 313–321, July–September, 2007     

Dendritic supramolecular assemblies for drug delivery

Dendritic supramolecular assemblies were formed in water with Reichardt's dye or the anticancer drug 10-hydroxycamptothecin and the dendritic macromolecule, ([G4]-PGLSA-OH)2-PEG3400.     

Branched Polymers on the Two-Dimensional Square Lattice with Attractive Surfaces

Using the renormalization group approach, an analysis is given of the asymptotic properties of branched polymers situated on the two-dimensional square lattice with attractive impenetrable surfaces. We modeled branched polymers as site lattice animals with loops and site lattice animals without loops on the simple square lattice. We found the gyration radius critical exponent =0.6511±0.0003 and =0.6513±0.0003 for branched polymers with and without loops, respectively. Our results for the crossover exponent =0.502±0.003 for branched polymers with loops and =0.503±0.003 for branched polymers without loops satisfy the recent hyperuniversality conjecture = . In addition, we have studied partially directed site lattice animals.     

Supercritical extraction of thyme (Thymus vulgaris L.)

Summary Chromatographic methods for the qualitative and quantitative analysis of thyme (Thymus vulgaris L.) extracts (essential oil obtained by steam distillation and extracts obtained by carbon dioxide supercritical fluid extraction and methylene chloride) are described. The composition of extracts obtained at different pressures (from 80 bar to 400 bar) and constant temperature (40°C) is discussed. The extraction system thyme— supercritical carbon dioxide was modelled by empirical equations defining the dependence of the total extract (TE) solubility and thymol solubility in CO₂ on the density of carbon dioxide.     

Characterization of an optical frequency comb using modified direct frequency comb spectroscopy

We introduce a method for determination of the absolute frequencies of comb lines within an optical frequency comb spectrum. The method utilizes the experimental and theoretical approach of the velocity-selective optical pumping of the atomic ground state hyperfine levels induced by resonant pulse-train excitation. The information on the laser pulse repetition frequency and carrier–envelope offset are physically mapped onto the ⁸⁷Rb ground state hyperfine level population velocity distributions. Theoretical spectra are calculated using an iterative analytic solution of the optical Bloch equations describing the resonant pulse-train excitation of four-level ⁸⁷Rb atoms. They are employed to fit the measured spectra and obtain the parameters of the frequency comb, thus providing a practical algorithm which can be used in real-time measurements.