Studia Universitatis Moldaviae. Stiinte reale si ale naturii

3-7

Authors: Adriana DRUȚA, Iurie BACALOV, Elena CHIRIŢA, Aurelia CRIVOI, Ana ILIEŞ

Currently, diabetes is the most common endocrine disease and is characterized by complications that develop over time and affects various organs and organ systems. This metabolic disease manifests itself over a long period of time, in which the increase in blood sugar and the occurrence of glucosuria occur. Systematic studies have shown the beneficial effect of bee preparations, which has been found to improve glycemia in a relatively short time and to avoid its extremely dangerous fluctuations. In addition, their action persists in the body for a long time after the treatment is completed.

14-17

Authors: Maria MELNIC, Olesea GLIGA, Dumitru ERHAN, Ștefan RUSU

In the paper we indicate data on some morpho-physiological changes caused by the potato culture (Solanum tuberosum L.) by the saprophytic nematode complex associated with microorganisms. In the process of the Agata variety potato tubers analysis, infested by Ditylenchus destructor Thorne, 1945 in advanced stages of ditilenhosis (3, 4), there have been observed changes in the form of swelling. The results of the laboratory analyzes of the infected tubers showed the presence of the saprophytic nematodes of the orders Rhabditida and Aphelenchida in a number of about – 2000 individuals/gram of tissue, which are included in 2 trophic-ecological groups, bacterivores and fungivores. According to the data, the most common species have been found in the families: Cephalobidae (63.2%), Neodiplogasteridae (17,6%) and Rhabditidae (12,8%), but the most rarely detected are those of the family Aphelenchidae (6.4%). The presence of secondary nematodes, bacterivores and fungivores demonstrates that the infested tissue forms a nutritious substrate for these nematodes.

25-30

Authors: Анжела РУДАКОВА, Сергей РУДАКОВ, Анна АРТЕМЬЕВА, Юрий ЧЕСНОКОВ

To study the polymorphism by esterase composition 30 samples of mature seeds of various varieties and subspecies Brassica campestris L. from the VIR collection (St. Petersburg) were examined. The method of native electrophoresis in PAAG with the subsequent processing of the gels revealed 10 main zones of esterase enzymes, which were subdivided into 2 conditional loci – “b” and “c”. Five zones of higher molecular weight (42,0 кД – 32,4 кД) were designated as b1–b5. All of them turned out to be monomorphic, i.e. characteristic of all samples. The “c” locus was represented by five lower molecular weight zones (25,6 кД -15,0 кД ), which were designated as c1-c5. These zones were characterized by the highest polymorphism among the samples presented. According to their esterase complex, all samples were divided into 8 groups (zymotypes). The most common was the zymotype 1 (50% of the total number of genotypes). The second most common was zymotype 2, its representatives accounted for 16,7%. The maximum number of esterase enzymes (9 zones) were characterized by the zymotype 3 and 4. The zymotypes 7 and 8 have the smallest number of esterases (6 zones). The frequency of occurrence of each zone among all genotypes varied from 6,7% to 96,7%. The most common among all polymorphic esterase zones was the zone c3 (Mr 20,9 kD), the frequency of its occurrence was 96,7% of the total number of genotypes. The relative amount of different isoforms of esterase enzymes in samples varies significantly. The average statistical value of the content of all isoenzymes of locus “b” varies from 11,8% (zone b5) to 23,5% (zone b4), while for enzymes of the locus “c” this value varies from 2,2% (zone c1) to 7,1% (zone c3).

38-41

Authors: Lazăr CHIRICĂ

The Black Sea is a unique basin with a complicated geological history, a hidrobiological regime that has changed much in time and has significant level variation throughout it’s evolution. It’s the most important basin for developing chemolitoatotrophic bacteria which influence the development of hydrogen sulphide (H2S) unprecedentely and the anaeropic processes are present fact, which express the meromic character of the basin.

48-58

Authors: Gheorghe DUCA, Vera MATVEEVICI, Maria GONŢA, Larisa MOCANU

The process of reducing the concentration of some organic pollutants (dyes and auxiliary substances) contained in textile wastewater was studied. For this purpose we applied electrochemical methods based on electroflotation. The research experiments were performed in an electrochemical cell without diaphragm with monopolar electrodes. It was determined the influence of cationic flocculant (PDAMDAC) and formic aldehyde on the efficiency of the treatment process, experimentaly. The optimum conditions for removing pollutants were determined according to the time of electroflotation, the intensity of the electric current, the concentration of the flocculant, and the concentration of the formic aldehyde. As a result of the scientific research, it was found that the efficiency of removal of pollutants from the synthetic systems DR-LLS-Bis-MPA-DEG-FA is influenced by the concentration of PDAMDAC. In the presence of flocculant PDADMAC, the efficiency is higher together with increasing concentration and the synthetic systems are treated by combining methods of electroflotation and adsorption on activated carbon, and in the absence of the flocculant - by combining the methods of electroflotation, catalytic oxidation and adsorption.

68-73

Authors: Ştefan ROBU, Ana POPUŞOI, Galina DRAGALINA, Ion LUNGU, Vadim FURTUNĂ, Tamara POTLOG

In the present scientific work we describes the synthesis of zinc mono- and polyhydroxyphtha- locyanines, which have been grafted to some carbazole copolymers in order to create photosen- sitive materials. From obtained powders thin films, which were characterized with X-ray diffraction (XRD), FTIR and UV-VIS spectroscopies were synthetized. The presence of the phthalocyanine fragment in the polymer-analogues were confirmed by the XRD and FTIR spectra. Solar cells based on zinc mono- and tetra-hydroxyphthalocyanines layers with 0.43 V and 0.41 V open circuit voltage, respectively were prepared.