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A number of carboxylate esters of L-dopa, some of which are novel, were examined for their physicochemical and biological properties. A few esters of tyrosine and phenylalanine were included for comparison. The compounds displayed great differences in their lipophilicity and stability towards chemical and enzymatic (human plasma) hydrolysis. Within(More)
AIM To investigate the occurrence of apoptotic cell death in the epithelium of radicular cysts and to compare its frequency in lesions presenting a distinct functional state. METHODOLOGY Twenty radicular cysts were selected and arranged into two groups with 10 lesions in each group: atrophic (quiescent) and hyperplastic (active) epithelium. Morphologic(More)
This paper presents the synthesis and characterization of gellan gum derivatives containing quaternary ammonium groups, with the purpose of obtaining particulate controlled release systems for ciprofloxacin. Quaternized gellan derivatives were synthesized by grafting N-(3-chloro-2-hydroxypropyl)-trimethyl ammonium chloride onto gellan primary hydroxyl(More)
The effect of the thermo-hydro-mechanical (THM) densification in a closed system on the set recovery and thermal stability of lime (Tilia cordata) wood was evaluated. The THM densification process consists of four steps: plastification, densification, post-treatment and cooling. The THM-densified wood samples were subjected to three different post-treatment(More)
The effects of the soft-rot fungus Trichoderma viride Pers., on the thermal behavior of lime wood (Tillia cordata Mill.) were investigated. The lime wood pieces were inoculated with the fungus over a 12-week period. At pre-established time intervals two samples were withdrawn from the medium and analyzed by thermogravimetry and differential calorimetry, and(More)
The paper presents a study on the physicochemical properties of some new symmetrical diquaternary salts of 4,4 -bipyridine. The properties refer to the acid-basic and thermal behavior of these compounds. The chemical stability of these salts in solution was found to be pH dependant. Thus, in the basic medium they converted into amphionic compounds of the(More)
The advent of heart-surgery in obstetrics has been determinant, in as much as it has improved therapeutic treatment and above all it has resulted in achievement which were impossible 30 years ago. The concepts already put forward by the school of cardio-obstetric surgery of Turin on haemodynamics in pregnancy and childbirth as biologic risk factors for the(More)
Chitosan, a natural polycationic polysaccharide, was coupled with two polyanionic polymers: Na-alginate and carboxymethylcellulose (CMC) and with tannic acid (TA) obtaining three species of self-assembled complexes: chitosan/alginate/TA (sample 1), chitosan/TA (sample 2) and chitosan/CMC/TA (sample 3). The microparticle formation was achieved by dropwise(More)
In this paper, a new methodology based on neural networks is proposed to study the thermal degradation process of some cholesteric liquid crystals decorated with ferrocene. First of all, a set of experimental data is obtained applying thermal analysis methods, under dynamic heating conditions. Neural networks were used to predict the thermostability(More)