Synthesis of a new nitrogenated drimane derivative with antifungal activity

Drimane sesquiterpenes are highly valuable due to their strong biological activity. In this work, we report the enhanced antifungal activity of 11-guanidinodrimene, a new compound derived from drimenol. The binding of the guanidine group at the C-11 carbon increased the antifungal activity when tested against Candida albicans, one of the most commonly found human pathogens.     

Identification and Quantification of Tocopherols in Vegetable Oils by Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC -     

Directional K- Functionals Claudia Cottin

When considering approximation of continuous periodic functions f: R ^d → R by blending-type approximants which depend on directions ξ₁,…,ξ_ν ∈ R ^d directional moduli of smoothness (1) are appropriate measures of smoothness of /. In this paper, we introduce equivalent directional K- functionals. As an application, we obtain a result on the degree of approximation by certain trigonometric blending functions.     

Poly(ethylene oxide)/poly(ethyl methacrylate) blends: Crystallization,melting behavior,and miscibility

Results of an investigation of isothermal crystallization and thermal behavior of poly(ethylene oxide)/poly(ethyl methacrylate) (PEO/PEMA) blends are reported. The blend composition and the crystallization temperature strongly influence the crystallization process from the melt and the melting temperature of PEO. The addition of PEMA to PEO causes a depression in the spherulite growth rate, in the overall kinetic crystallization constant, and in the melting temperature. Experimental data on the radial growth rate G and overall kinetic rate constant K_n are analyzed by means of the latest kinetic theory. From this analysis it emerges that the crystallization of pure PEO and PEO in the blend conforms to the regime I process of surface secondary nucleation. The depression of the melting temperature cannot be explained only in terms of a diluent effect due to the compatibility of the two components in the melt. Annealing and morphological effects, dependent on composition and time, must also be taken into account.     

New disc-shaped triarylamino-1,3,5-triazines with heteroaromatic central cores

New disc-shaped triarylamino-1,3,5-triazines were prepared by reaction of cyanuric chloride with two-fold alkoxy substituted anilines. Each of the triarylmelamines exhibits an enanti-otropic mesophase. X-ray investigations reveal the formation of columnar liquid crystalline structures with either a hexagonal or a rectangular lattice. The lattice parameters, as well as the intracolumnar ordering, depend on the length of the flexible lateral side chains. The new melamines form Langmuir monolayers at the air/water interface due to their amphiphilic nature. The monolayer organization is characterized by a side-on arrangement of the molecules. The polar central molecular parts lie flat on the water, whereas the lateral alkyl chains are oriented perpendicular to the water surface.     

Existence of Optimal Controls for Partially Observed Jump Processes

A partially observable control problem for an R ^d -valued jump process with counting observations is studied. The state and the observations may be strongly dependent and, in particular, the two processes may jump together. An equivalent separated problem is introduced and the existence of an optimal control for the separated problem is obtained in the class of relaxed and generalized controls. Equivalence between the initial problem and the relaxed generalized separated control problem is discussed.     

Die 2,4-Dinitrophenylhydrazone von n-Aldehyden, Methyl-n-alkylketonen, ?thyl-n-alkylketonen und ?thyl-isoalkylketonen

Ohne Zusammenfassung