This is the second paper belonging to a study concerning the authentication of ancient easel-paintings, on canvas and wood support, from private and public collections, by using the FT-IR spectrophotometry technique for the analysis of the painting materials. Different pigments, egg binders, caseins and animal glue, often found in ancient easel-paintings on wood or canvas, have been used as standards for establishing the ageing rate of the paintings by correlation with the dates presented in the first note. The determination of the degradation rate of the painting materials is an important archaeometric characteristic used in authentication.
Abstract. Poly(carboxylic acid)-polysaccharide compositions have been found suitable for obtaining drug formulations with controlled release, most formulations being therapeutically efficacious, stable, and non-irritant. The influence of the characteristics of the aqueous solutions from which the polymer matrix is prepared (i.e. the total concentration of polymer in solutions and the mixing ratio between the partners, hydroxypropyl cellulose, HPC and maleic acid-alternating-styrene copolymer, MAc-alt-S) on the kinetics of some drugs release in acidic environment (pH = 2) has been followed by 'in vitro' dissolution tests. It has been established that the kinetics of procaine hydrochloride release from HPC/MAc-alt-S matrix depends on its composition; the diffusion exponent, n is close to 0.5 for matrices where one of the components is in large excess and n~0.02 for middle composition range. The lower value of diffusion exponent for middle composition range could be caused by the so called 'burst effect', therefore the kinetic evaluation is difficult.
The main objective of this paper is to bring forward a subject that was long neglected by the Romanian historiography and Slavic studies: the military importance of the contingents of Bohemian mercenaries within the army of John Hunyadi, and the extensive usage of the Wagenburg and the Hussite war wagons as part of the improvements of the armed forces in the Medieval Kingdom of Hungary. These changes were made by John Hunyadi during the first half of the fifteenth century, in relation to the tactical and strategic necessities imposed by the wars fought against the Turks. My approach of the topic sheds light on the ability of John Hunyadi to use the offensive, defensive, and logistical potential of this rudimentary but extremely versatile and efficient war machine, and points out at the fact that the Kingdom of Hungary was, at that time, up to date with the fourteenth-and fifteenth-century military technologies. In addition, this paper explores a variety of Christian and Ottoman sources and compares these narratives in regard to the subject. The current Romanian historiography has failed to provide a comprehensive analysis of the Hussite-style war wagons, and thus the relevance of this paper is linked to broadening the perspective on the matter.
A series of R-Salophen manganese(III) and iron(III) complexes, where R = OH, OCH3 or COOH, and Salophen is bis(salicylaldehyde)-N,N�-o-phenylendiimine, have been obtained. The synthesis and characterization by elemental analyses, 1H NMR, UV-VIS, FT IR, ESMS spectroscopy and cyclic voltammetry of the ligands and some complexes of Mn(III) and Fe(III) with R-Salophen are presented in this study.
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