Abstract

Today waste is an acute problem that cannot be neglected and should be considered linked to human society. Immediate solutions are needed especially in urban, overcrowded, where consumer society produces huge quantities of waste to store, if not accompanied by recycling create mountains of \"garbage\" that will pollute the planet.This paper contains an analysis of waste management in TimişCounty, Romania, in the last years. It is presented the evolution of waste quantities correlated with increase of population, and the evolution in collection ofrecyclable waste. A significant increase of all types of waste quantities are shown, which is due both to population growth, whose number increases with time and lack of interest in recycling. But, recent organized and well-publicized actions have had good results by collecting the large amount of specific waste and should be extended to other waste categories.

Abstract

Biomass as chemical solar energy accumulated in the form of vegetable or animal matter is one of the most precious and diverse resource of the earth.A resource that is still unexploited is the leaf litter known to be a natural fertilizer after decomposition. Throughout the degradation and leaching of leaf litter, “new born” substances are continuously generated and may aggregate to form humic substances. These findings suggest that leaf litter degradation extracts may be an important environmental factor influencing community structure within ecosystems. In this research we tried to decompose leaf litter with chemical reagents in order to obtain a liquid fertilizer as well as trying to use foliar biomass in combination with soil. When trying to decompose foliar biomass with chemical reagents, the development of the studied plants (petunia -Petunia hybrida, cress -Lepidiumsativum) was inhibited. This process occurred in case of using agar gel and in case of the cultivated plants in potsas well. The direct use of foliar biomass in combination with soil, after being preceded by an inhibitory process in the development of the plant, seems to have the role of a fertilizer.

Abstract

This study reveals that human and bacterial class I and class II aldolases, despite their low sequence similarity, present similar global fractal characteristics of their surfaces. Their surface fractal dimensions correspond to those reported in specific literature for globular proteins. There is one exception, bacterial aldolase class I, which shows a higher surface roughness confirming the dissimilarity of its active sites in comparison to other investigated aldolases and also its distinct evolution. The electrical properties of surfaces for the investigated proteins show that class II of aldolases have higher dipole moments and quite larger contact potentials, explaining the presence of active sites for Zn2+, K+ and NH4+ ions.

Abstract

Pyrimidine compounds for pharmaceutical use which were analyzed belong to cardiac agents (dipiridamol, moxonidine, piribedilum) and to cholesterol lowering drugs, the statins (rosuvastatin). This paper briefly characterizes two aspects: FT – IR spectra of drugs containing these active substances, before and after thermal transformation in which they were subjected; thermal analysis of these drugs by combining thermogravimetry (TG) with diferential thermal analysis (DTA) and diferantial scanning calorimetry (DSC). The results obtained indicate: drug decomposition accompanied by cleavage of pyrimidine ring and its substitutes, changes in sample with temperature, evidence of endo-and exothermic processes.

Abstract

Transdermal drug carrier systems are used to ensure a constant level of drug during the administration. Polyurethane derivatives were recently considered as possible material in the field. The study intends to obtain a possible drug carrier at nano level. Polyether-urethane (PEU) nanostructures were synthesized by using the technique of interfacial polycondensation combined to spontaneous emulsification. For synthesis, it were used an organic phase which contain lysine diisocyante ester (LDI) and a lipophilic surfactant (Span®85) in water-miscible solvent (acetone) and an homogeneous aqueous phase formed by water, diol or polyether and a hydrophilic surfactant (Tween®20 or Tween®60). The obtained nanostructures were finally characterized.

Abstract

In the last decades, the issue of “aspirin and clopidogrel resistance” was a provocative theme in the medical literature [1-4]. So far, there are a lot of studies published in this area, but its definition, diagnosis, etiology and clinical implications remain uncertain [1, 5].

Abstract

A conformational analysis with the semiempirical AM1 method was performed for (3S,5S,6S)-6-acetylamidopenicillanic acid. 13 distinct conformers were found within 6.66 kcal/mol. Dependence of some electronic properties of these conformers (HOMO and LUMO energies, dipole moment, νmin minimum vibration energy, maximum vibration energy νMAX., zero point vibration energy (ZPVE) and charge densities on atoms S1, N4, N14, O8, O12, O13 and O17) with respect to some geometric characteristics : pseudochirality of the N14 atom, the syn-anti arrangement of the O17 and H28 atoms of the amidic group and the three puckering classes of the thyazolidinic cycle noted with a, b, c.

Abstract

The present work presents for the first time the extraction of menthol with a new solid-phase microextraction method using as solid phase a helical solid sorbent [1,2] followed by introduction into a capillary column for a gas chromatographic analysis. The menthol was extracted from headspace sample and also a liquid solution sample and then was analyzed by gas chromatography. The quantitative evaluation was carried out with external standard method both for headspace and liquid solution.

Abstract

The present article is aimed towards the structural NMR analysis of 4H-4-amino-3-mercapto-5-(4-pyridil)-1,2,4-triazole (3) and its product of alkylation (via sodium salt) with ethyl chloroacetate in absolute ethanol. 4H-4-amino-3-mercapto-5-(4-pyridil)-1,2,4-triazole and 4H-4-amino-5-ethoxycarbonyl-methylsulfanyl-3-(4-pyridil)-1,2,4-triazole (4) were characterized by IR, 1H-NMR, 13C-NMR spectroscopy and structures were elucidated by 2D-1H-13C-HMBC spectroscopy.

Abstract

Syntheses of novel metal complexes of Cd2+ and Cu2+ was carried out in aqueous solution, using CdI2 and CuCl2•2H2O as source for metal ions and sodium salt of 4H-4-amino-5-carboxymethylsulfanyl-3-phenyl-1,2,4-triazole as ligand. All the compounds were preliminary characterized by melting point and IR spectroscopy.